Saturday, May 22, 2021

Arctic Ocean invaded by hot, salty water


Sea surface temperatures on the Northern Hemisphere have been rising dramatically over the years, as illustrated by above image, indicating that the latent heat tipping point is getting crossed, while the methane hydrates tipping point could get crossed soon, depending on developments.

At the moment, the surface temperature of most of the Arctic ocean's is still below 0°C.

Heat is entering the Arctic Ocean from the south, as illustrated by the image on the right. Hot, salty water is entering the Arctic Ocean from the Atlantic Ocean as currents dive underneath the ice, causing the ice to melt from below. 
[ click on images to enlarge ]

The image on the right, from the NSIDC article A step in our Spring, compares sea ice age between March 12 to 18 for the years 1985 (a) and 2021 (b).

The bottom graph (c) shows a time series from 1985 to 2021 of percent ice coverage of the Arctic Ocean domain. The Arctic Ocean domain is depicted in the inset map with purple shading.

At the end of the ice growth season in mid-March, 73.3% of the Arctic Ocean domain was covered by first-year ice, while 3.5% was covered by ice 4+ years old. 

This compares to 70.6% and 4.4% respectively in March 2020.

In March 1985, near the beginning of the ice age record, the Arctic Ocean region was comprised of nearly equal amounts of first-year ice (39.3%) and 4+ year-old ice (30.6%).

Sea ice that hasn't yet survived a summer melt season is referred to as first-year ice. This thin, new ice is vulnerable to melt and disintegration in stormy conditions. Ice that survives a summer melt season can grow thicker and less salty, since snow that thickens the ice contains little salt. Thickness and salt content determine the resistance of the ice to melt. Multiyear ice is more likely to survive temperatures that would melt first-year ice, and to survive waves and winds that would break up first-year ice.

The image on the right shows a forecast of the thickness of the sea ice, run on May 20, 2021 and valid for May 21, 2021. 

An area is visible north of Severnaya Zemlya toward the North Pole where thickness is getting very thin, while there is one spot where the ice has virtually disappeared. 

The spot is likely a melting iceberg, the animation on the right shows that the spot has been there for quite a few days, while the freshwater in this spot appears to result from melting amid salty water. 

Overall, sea ice is getting very thin, indicating that the buffer constituted by the sea ice underneath the surface is almost gone, meaning that further heat entering the Arctic Ocean will strongly heat up the water. 

As the animation underneath on the right shows, freshwater is entering the Arctic Ocean due to runoff from land, i.e. rainwater from rivers, meltwater from glaciers and groundwater runoff from thawing permafrost. 

At the same time, very salty water is entering the Arctic Ocean from the Atlantic Ocean. 

The map below shows how salty and hot water from the Atlantic Ocean enters the Arctic Ocean along two currents, flowing on each side of Svalbard, and meeting at this area north of Severnaya Zemlya where thickness is getting very low. 

The blue color on the map indicates depth (see scale underneath). 

The image below, by Malcolm Light and based on Max & Lowrie (1993), from a recent post, shows vulnerable Arctic Ocean slope and deep water methane hydrates zones below 300 m depth. 

Malcolm Light indicates three areas: 
Area 1. Methane hydrates on the slope;
Area 2. Methane hydrates on the abyssal plane; 
Area 3. Methane hydrates associated with the spreading Gakkel Ridge hydro-thermal activity (the Gakkel Riidge runs in between the northern tip of Greenland and the Laptev Sea). 


The freezing point of freshwater is 0°C or 32°F. For salty water, the freezing point is -2°C or 28.4°F.

During April 2021, sea ice was about 160 cm thick.

In June and July 2021, thickness will fall rapidly, as illustrated by the image on the right by Nico Sun. 

Sea ice acts as a buffer, by consuming energy in the process of melting, thus avoiding that this energy causes a temperature rise of the water. 

As long as there is sea ice in the water, this sea ice will keep absorbing heat as it melts, so the temperature will not rise at the sea surface and remain at zero°C. The amount of energy that is consumed in the process of melting the ice is as much as it takes to heat an equivalent mass of water from zero°C to 80°C.

The accumulated ice melt energy until now is the highest on record, as illustrated by the image on the right, by Nico Sun.

The image below further illustrate the danger. As the temperature of the water keeps rising, more heat will reach sediments at the seafloor of the Arctic Ocean that contain vast amounts of methane, as discussed at this page and in this post.

Ominously, methane levels reached a peak of 2901 ppb at 469 mb on May 13, 2021. 

Research

In the extract of a 2008 paper, Natalia Shakhova et al. conclude: ". . we consider release of up to 50 Gt of predicted amount of hydrate storage as highly possible for abrupt release at any time."


The video below contains excerpts from Nick Breeze's interview with Natalia Shakhova at the European Geophysical Union in Vienna, 2012, on the likelihood and timeframe of a large methane release from the seafloor of the Arctic Ocean. 

Natalia Shakhova: "The total amount of methane in the atmosphere is about 5Gt. The amount of carbon in the form of methane in this Arctic shelf is - approximately - from hundreds to thousands Gt and, of course, only 1% of [such an] amount is required to double the atmospheric burden of methane."

"But to destabilize 1% of this carbon pool, I think, not much effort is needed, considering the state of the permafrost and the amount of methane involved, because what divides the methane from the atmosphere is a very shallow water column and the weakening permafrost, which is losing its ability to seal, to serve as a seal, and this is, I think, not a matter of thousands of years, it's a matter of decades, at most hundred years." 

(Natalia talks with Igor Semiletov)
Natalia Shakhova: "Just because this area is seismically and tectonically active, and there was some investigation that the tectonic activity was increasing, and the seismic activity, the destabiliation of the ground, just mechanical forcing destabiliation [may suffice to act as] additional pathway for this methane to escape. There are many factors that are very convincing for us [to conclude] that it might happen."

Elaborating on the timeframe.
Natalia Shakhova: "Not any time, any time sounds like it might happen today, it might happen tomorrow, the day after tomorrow . . " 
Igor Simelitov: "It might!"


The image below was created with content from a 2019 paper by Natalia Shakhova et al. It concludes that methane releases could potentially increase by 3-5 orders of magnitude, considering the sheer amount of methane preserved within the shallow East Siberian Arctic Shelf seabed deposits and the documented thawing rates of subsea permafrost reported recently.

In a 2021 paper by researchers from Europe, Russia and the U.S., results from field research are published showing that methane is getting released from locations deep below the submarine permafrost. Lead author, Julia Steinbach, from Stockholm University, says: “The permafrost is a closed lid over the seafloor that’s keeping everything in place. And now we have holes in this lid.” 

In the video below, Nick Breeze interviews Igor Semiletov on methane plumes detected during this 2020 field research over the East Siberian Arctic Shelf (ESAS).


In the video below, Nick Breeze interviews Örjan Gustafsson on field research on methane in the East Siberian Arctic Shelf (ESAS)


In the video below, Peter Wadhams analyses the threat of Arctic methane releases.


In the video below, Guy McPherson discusses the situation.


In conclusion, temperatures could rise dramatically soon. A 3°C will likely suffice for humans to go extinct, making it in many respects rather futile to speculate about what will happen in the longer term. On the other hand, the right thing to do is to help avoid the worst things from happening, through comprehensive and effective action as described in the Climate Plan.

Links

• NOAA Climate at a Glance

• Danish Meteorological Institute - Arctic temperature
http://ocean.dmi.dk/arctic/meant80n.uk.php

• Freezing point of water - Climate Change: Arctic sea ice

• Arctic surface temperature

• NSIDC: A step in our Spring, image credit: T. Tschudi, University of Colorado, and W. Meier and J.S. Stewart, National Snow and Ice Data Center/Image by W. Meier

• Arctic sea ice - thickness and salinity - navy.mil
https://www7320.nrlssc.navy.mil/GLBhycomcice1-12/arctic.html

• CryosphereComputing - by Nico Sun
https://cryospherecomputing.tk

• A 4.5 km resolution Arctic Ocean simulation with the global multi-resolution model FESOM 1.4 - by Qiang Wang et al. 

• Max, M.D. & Lowrie, A. 1993. Natural gas hydrates: Arctic and Nordic Sea potential. In: Vorren, T.O., Bergsager, E., Dahl-Stamnes, A., Holter, E., Johansen, B., Lie, E. & Lund, T.B. Arctic Geology and Petroleum Potential, Proceedings of the Norwegian Petroleum Society Conference, 15-17 August 1990, Tromso, Norway. Norwegian Petroleum Society (NPF), Special Publication 2 Elsevier, Amsterdam, 27-53.
https://www.elsevier.com/books/arctic-geology-and-petroleum-potential/vorren/978-0-444-88943-0

• Extinction by 2027- by Malcolm Light
https://arctic-news.blogspot.com/2021/05/extinction-by-2027.html


• Anomalies of methane in the atmosphere over the East Siberian shelf: Is there any sign of methane leakage from shallow shelf hydrates? - by Shakhova, Semiletov, Salyuk and Kosmach (2008)
https://www.cosis.net/abstracts/EGU2008/01526/EGU2008-A-01526.pdf

• Understanding the Permafrost–Hydrate System and Associated Methane Releases in the East Siberian Arctic Shelf - by Natalia Shakhova, Igor Semiletov and Evgeny Chuvilin 
https://www.mdpi.com/2076-3263/9/6/251

• A Massive Methane Reservoir Is Lurking Beneath the Sea 


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Tuesday, May 18, 2021

Extinction by 2027

by Malcolm Light

The greatest threat to humanity on Earth is the escalating Arctic atmospheric methane buildup, caused by the destabilization of subsea methane hydrates. This subsea Arctic methane hydrate destabilization will go out of control in 2024 and lead to a catastrophic heatwave by 2026.

While the source region for this subsea methane is in Russian waters, the hot ocean current setting them off is the northern extension of the Gulf Stream - North Atlantic Drift, the “Svalbard Current”, which makes United States and Canadian atmospheric pollution guilty of this looming catastrophic Global Extinction event.


References

Extinction by 2027 - Post by Malcolm Light and comments 
https://www.facebook.com/malcolm.light.50/posts/4013328748745929

Anomalies of methane in the atmosphere over the East Siberian shelf: Is there any sign of methane leakage from shallow shelf hydrates? - by Shakhova, Semiletov, Salyuk and Kosmach (2008) 
http://www.cosis.net/abstracts/EGU2008/01526/EGU2008-A-01526.pdf

Max, M.D. & Lowrie, A. 1993. Natural gas hydrates: Arctic and Nordic Sea potential. In: Vorren, T.O., Bergsager, E., Dahl-Stamnes, A., Holter, E., Johansen, B., Lie, E. & Lund, T.B. Arctic Geology and Petroleum Potential, Proceedings of the Norwegian Petroleum Society Conference, 15-17 August 1990, Tromso, Norway. Norwegian Petroleum Society (NPF), Special Publication 2 Elsevier, Amsterdam, 27-53. 
https://www.elsevier.com/books/arctic-geology-and-petroleum-potential/vorren/978-0-444-88943-0

Lucy-Alamo Projects - Hydroxyl Generation and Atmospheric Methane Destruction 

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Thursday, March 18, 2021

Overshoot or Omnicide?

Questions and Answers with Sam Carana


Above image shows a non-linear blue trend based on 1880-2020 NASA Land+Ocean data that are adjusted 0.78°C to reflect a pre-industrial base, to more fully reflect strong polar warming, and to reflect surface air temperatures over oceans. This blue trend highlights that the 1.5°C threshold was crossed in 2012 (inset), while the 2°C threshold looks set to be crossed next year and a 3°C rise could be reached at the end of 2026.

Overshoot?

The blue trend in the image at the top shows the temperature rise crossing 1.5°C in 2012. Could this have been a temporary overshoot? Could the trend be wrong and could temperatures come down in future, instead of continuing to rise, and could temperatures fall to such extent that this will bring the average temperature rise back to below 1.5°C?

To answer this question, let's apply the method followed by the IPCC and estimate the average temperature rise over a 30-year period that is centered around the start of 2012, i.e. from 1997 to the end of 2026. The IPPC used a 30-year period in its Special Report on Global Warming of 1.5 ºC, while assuming that, for future years, the current multi-decadal warming trend would continue (see image below).


As said, the image at the top shows the temperature rise crossing 1.5°C in 2012. For the average temperature over the 30-year period 1997-2026 to be below 1.5°C, temperatures would have to fall over the next few years. Even if the temperature for 2021 fell to a level as low as it was in 2018 and remained at that same lower level until end 2026, the 1997-2026 average would still be more than 1.5°C above pre-industrial. Furthermore, for temperatures to fall over the next few years, there would need to be a fall in concentrations of greenhouse gases over the next few years, among other things. Instead, greenhouse gas levels appear to be rising steadily, if not at accelerating pace.

What did the IPCC envisage? As the image below shows, the IPCC in AR5 did envisage carbon dioxide under RCP 2.6 to be 421 ppm in 2100, while the combined CO₂e for carbon dioxide, methane and nitrous oxide would be 475 ppm in 2100.


The image below, based on a study by Detlef van Vuuren et al. (2011), pictures pathways for concentrations of carbon dioxide, methane and nitrous oxide, for each of four Representative Concentration Pathways (RCPs).


Above image shows that, for RCP 2.6 to apply in the above study, there is little or no room for a rise in these greenhouse gases. In fact, the study shows that methane levels would have to be falling dramatically. At the moment, however, methane concentrations show no signs of falling and instead appear to be following if not exceeding RCP 8.5, as discussed in a recent post and as also illustrated by the images below. The IPCC used similar figures in AR5 (2013), as shown below. 


Greenhouse gas levels are rising

As the image below shows, the carbon dioxide (CO₂) level recorded at Mauna Loa, Hawaii, was 421.36 parts per million (ppm) on April 8, 2021. 


The N20 satellite recorded a methane peak of 2862 ppb on the afterrnoon of March 29, 2021, at 487.2 mb, as the image below shows.


A similarly high methane peak was recorded by the MetOp-1 satellite at 469 mb on the morning of April 4, 2021. 

Below are the highest daily mean methane levels recorded by the MetOp-1 satellite at selected altitudes on March 10 or 12, for the years 2013-2021, showing that methane levels are rising, especially at the higher altitude associated with 293 mb. 


Similarly, nitrous oxide levels show no signs of falling, as illustrated by the image below.


Methane grew 15.85 ppb in 2020, how fast could CO₂e rise? 

Rising greenhouse gas levels and associated feedbacks threaten to cause temperatures to keep rising, in a runaway scenario that cannot be reverted even if emissions by people were cut to zero.

Peaks in greenhouse gas levels could suffice to trigger the clouds feedback, which occurs when a CO₂e threshold of around 1,200 ppm is crossed, and the stratocumulus decks abruptly become unstable and break up into scattered cumulus clouds.

Once the clouds tipping point is crossed, it will be impossible to undo its impact, in line with the nature of a tipping point. In theory, CO₂ levels could come down after the stratocumulus breakup, but the stratocumulus decks would only reform once the CO₂ levels drop below 300 ppm.

A recent post repeated the warning that by 2026, there could be an 18°C rise when including the clouds feedback, while humans will likely go extinct with a 3°C rise and most life on Earth will disappear with a 5°C rise. In conclusion, once the clouds feedback gets triggered, it cannot be reverted by people, because by the time the clouds feedback starts kicking in, people would already have disappeared, so there won't be any people around to keep trying to revert it.

[ click on images to enlarge ]
Methane levels are rising rapidly. The image to the right shows a trend that is based on NOAA 2006-2020 annual global mean methane data and that points at a mean of 3893 ppb getting crossed by the end of 2026. 

Why is that value of 3893 ppb important? On April 8, 2021, carbon dioxide reached a peak of 421.36 ppm, i.e. 778.64 ppm away from the clouds tipping point at 1200 ppm, and 778.64 ppm CO₂e translates into 3893 ppb of methane at a 1-year GWP of 200. 

In other words, a methane mean of 3893 ppb alone could cause the clouds tipping point to get crossed, resulting in an abrupt 8°C temperature rise. 

Such a high mean by 2026 cannot be ruled out, given the rapid recent growth in mean annual methane levels (15.85 ppb in 2020, see inset on image). 

Additionally, there are further warming elements than just carbon dioxide and methane, e.g. nitrous oxide and water vapor haven't yet been included in the CO₂e total.

Moreover, it may not even be necessary for the global mean methane level to reach 3893 ppb. A high methane peak in one single spot may suffice and a peak of 3893 ppb of methane could be reached soon, given that methane just reached a peak of 2862 ppb, while even higher peaks were reached over the past few years, including a peak of 3369 ppb recorded on the afternoon of August 31, 2018. 

Abrupt stratocumulus cloud shattering 

[ click on images to enlarge ]
Catastrophic crack propagation is what makes a balloon pop. Could low-lying clouds similarly break up and vanish abruptly?

Could peak greenhouse gas concentrations in one spot break up droplets into water vapor, thus raising CO₂e and propagating break-up of more droplets, etc., to shatter entire clouds?

In other words, an extra burst of methane from the seafoor of the Arctic Ocean alone could suffice to trigger the clouds tipping point and abruptly push temperatures up by an additional 8°C.

Omnicide?

This brings the IPCC views and suggestions into question. As discussed above, for the average temperature to come down to below 1.5°C over the period 1997-2026, temperatures would need to fall over the next few years. What again would it take for temperatures to fall over the next few years?

Imagine that all emissions of greenhouse gases by people would end. Even if all emissions of greenhouse gases by people could magically end right now, there would still be little or no prospect for temperatures to fall over the next few years. Reasons for this are listed below, and it is not an exhaustive list since some things are hard to assess, such as whether oceans will be able to keep absorbing as much heat and carbon dioxide as they currently do.

By implication, there is no carbon budget left. Suggesting that there was a carbon budget left, to be divided among polluters and to be consumed over the next few years, that suggestion is irresponsible. Below are some reasons why the temperature is likely to rise over the next few years, rather than fall.

How likely is a rise of more than 3°C by 2026?

• The warming impact of carbon dioxide reaches its peak a decade after emission, while methane's impact over ten years is huge, so the warming impact of the greenhouse gases already in the atmosphere is likely to prevent temperatures from falling and could instead keep raising temperatures for some time to come.

• Temperatures are currently suppressed. We're in a La Niña period, as illustrated by the image below.


[ click on images to enlarge ]
As NASA describes, El Niño events occur roughly every two to seven years. As temperatures keep rising, ever more frequent strong El Niño events are likely to occur. NOAA anticipates La Niña to re-emerge during the fall or winter 2021/2022, so it's likely that a strong El Niño will occur between 2023 and 2025. 

• Rising temperatures can cause growth in sources of greenhouse gases and a decrease in sinks. The image below shows how El Niño/La Niña events and growth in CO₂ levels line up. 


• We're also at a low point in the sunspot cycle. As the image on the right shows, the number of sunspots can be expected to rise as we head toward 2026, and temperatures can be expected to rise accordingly. According to James Hansen et al., the variation of solar irradiance from solar minimum to solar maximum is of the order of 0.25 W/m⁻².

• Add to this the impact of a recent Sudden Stratospheric Warming event. We are currently experiencing the combined impact of three short-term variables that are suppressing the temperature rise, i.e. a Sudden Stratospheric Warming event, a La Niña event and a low in sunspots.

Over the next few years, in the absence of large volcano eruptions and in the absence of Sudden Stratospheric Warming events, a huge amount of heat could build up at surface level. As the temperature impact of the other two short-term variables reverses, i.e. as the sunspot cycle moves toward a peak and a El Niño develops, this could push up temperatures substantially. The world could be set up for a perfect storm by 2026, since sunspots are expected to reach a peak by then and since it takes a few years to move from a La Niña low to the peak of an El Niño period.

• Furthermore, temperatures are currently also suppressed by sulfate cooling. This impact is falling away as we progress with the necessary transition away from fossil fuel and biofuel, toward the use of more wind turbines and solar panels instead. Aerosols typically fall out of the atmosphere within a few weeks, so as the transition progresses, this will cause temperatures to rise over the next few years. Most sulfates are caused by large-scale industrial activity, such as coal-fired power plants and smelters. A significant part of sulphur emissions is also caused by volcanoes. Historically, some 20 volcanoes are actively erupting on any particular day. Of the 49 volcanoes that erupted during 2021, 45 volcanoes were still active with continuing (for at least 3 months) eruptions as at March 12, 2021.

• Also holding back the temperature rise at the moment is the buffer effect of thick sea ice in the Arctic that consumes heat as it melts. As Arctic sea ice thickness declines, more heat will instead warm up the Arctic, resulting in albedo changes, changes to the Jet Stream and possibly trigger huge releases of methane from the seafloor. The rise in ocean temperature on the Northern Hemisphere looks very threatening in this regard (see image on the right) and many of these developments are discussed at the extinction page. There are numerous further feedbacks that look set to start kicking in with growing ferocity as temperatures keep rising, such as releases of greenhouse gases resulting from permafrost thawing and the decline of the snow and ice cover. Some 30 feedbacks affecting the Arctic are discussed at the feedbacks page.

• The conclusion of study after study is that the situation is worse than expected and will get even worse as warming continues. Some examples: a recent study found that the Amazon rainforest is no longer a sink, but has become a source, contributing to warming the planet instead; another study found that soil bacteria release CO₂ that was previously thought to remain trapped by iron; another study found that forest soil carbon does not increase with higher CO₂ levels; another study found that forests' long-term capacity to store carbon is dropping in regions with extreme annual fires; a recent post discussed a study finding that at higher temperatures, respiration rates continue to rise in contrast to sharply declining rates of photosynthesis, which under business-as-usual emissions would nearly halve the land sink strength by as early as 2040; the post also mentions a study on oceans that finds that, with increased stratification, heat from climate warming less effectively penetrates into the deep ocean, which contributes to further surface warming, while it also reduces the capability of the ocean to store carbon, exacerbating global surface warming; finally, a recent study found that kelp off the Californian coast has collapsed. So, both land and ocean sinks look set to decrease as temperatures keep rising, while a 2020 study points out that the ocean sink will also immediately slow down as future fossil fuel emission cuts drive reduced growth of atmospheric CO₂. 

Where do we go from here?

[ image from earlier post ]
The same blue trend that's in the image at the top also shows up in the image on the right, from an earlier post, together with a purple trend and a red trend that picture even worse scenarios than the blue trend.

The purple trend is based on 15 recent years (2006-2020), so it can cover a 30-year period (2006-2035) that is centered around end December 2020. As the image shows, the purple trend points at a rise of 10°C by 2026, leaving little or no scope for the current acceleration to slow, let alone for the anomaly to return to below 2°C.

The red trend is based on a dozen recent years (2009-2020) and shows that the 2°C threshold could already have been crossed in 2020, while pointing at a rise of 18°C by 2025.

In conclusion, temperatures could rise by more than 3°C by the end of 2026, as indicated by the blue trend in the image at the top. At that point, humans will likely go extinct, making it in many respects rather futile to speculate about what will happen beyond 2026. On the other hand, the right thing to do is to help avoid the worst things from happening, through comprehensive and effective action as described in the Climate Plan.


Links

• Climate Plan

• NOAA Global Climate Report - February 2021 - Monthly Temperature Anomalies Versus El Niño

• NOAA Northern Hemisphere Ocean Temperature Anomaly

• NOAA Sunspots - solar cycle progression

• Smithsonian Institution - Volcanoes - current eruptions

• IPCC Special Report Global Warming of 1.5 ºC - Summary for Policy Makers

• IPCC AR5 WG1 Summary for Policymakers - Box SPM.1: Representative Concentration Pathways

• IPCC AR5, Climate Change (2013), Chapter 8

• The representative concentration pathways: an overview - by Detlef van Vuuren et al. (2011)

• Young people's burden: requirement of negative CO₂ emissions - by James Hansen et al. (2017)

• 2020: Hottest Year On Record

• What Carbon Budget?

• Most Important Message Ever

• High Temperatures October 2020

• Temperature keep rising

• More Extreme Weather

• Extinction

• Feedbacks

• Sudden Stratospheric Warming

• Possible climate transitions from breakup of stratocumulus decks under greenhouse warming - by Tapio Schneider  et al.

• Iron mineral dissolution releases iron and associated organic carbon during permafrost thaw - by Monique Patzner et al.

• Global maps of twenty-first century forest carbon fluxes - by Nancy Harris et al.

• A trade-off between plant and soil carbon storage under elevated CO2 - by César Terrer et al.

• Forests' long-term capacity to store carbon is dropping in regions with extreme annual fires

• Decadal changes in fire frequencies shift tree communities and functional traits - by Adam Pellegrini et al.

• NOAA - Annual Mean Growth Rate for Mauna Loa, Hawaii

• NOAA - Trends in Atmospheric Methane
https://www.esrl.noaa.gov/gmd/ccgg/trends_ch4

• The Climate Data Guide: Nino SST Indices - by Kevin Trenberth & NCAR Staff (Eds)
https://climatedataguide.ucar.edu/climate-data/nino-sst-indices-nino-12-3-34-4-oni-and-tni

• Historical change of El Niño properties sheds light on future changes of extreme El Niño - by Bin Wang et al. 

• NOAA - ENSO: Recent Evolution, Current Status and Predictions, April 12, 2021
https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/lanina/enso_evolution-status-fcsts-web.pdf

• Upper Ocean Temperatures Hit Record High in 2020 - by Lijing Cheng et al.

• Large-scale shift in the structure of a kelp forest ecosystem co-occurs with an epizootic and marine heatwave - by Meredith McPherson et al.

• External Forcing Explains Recent Decadal Variability of the Ocean Carbon Sink - by Galen McKinley et al. (2020) 
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019AV000149

• Maximum warming occurs about one decade after a carbon dioxide emission - by Katharine Ricke et al.

• Blue Ocean Event

• Confirm Methane's Importance

• FAQs

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Sunday, March 7, 2021

Confirm Methane's Importance

Agriculture, land use and forestry responsible for half of people's greenhouse gases emissions?

The image on the right updates an image from an earlier post, illustrating the difference between using a Gobal Warming Potential (GWP) for methane of 150 over a few years versus 28 over 100 years. The IPCC in its special report Climate Change and Land assessed the impact of AFOLU (agriculture, forestry, and other land use) versus the impact of fossil fuel, etc., by using a GWP for methane of 28 over 100 years, referring to AR5, an earlier IPCC report. 

Since AR5 was published, a study found methane's 100-year GWP to be 14% higher than the IPCC value. The image on the right therefore uses a short-term GWP for methane of 171 in the panel on the right-hand side, 14% higher than the 150 used earlier.

When using this 171 GWP for methane and when including pre- and post-production activities in the food system, AFOLU (agriculture, forestry, and other land use) causes about half of people's 2007-2016 emissions. 

The black bar for methane at a GWP of 171 in the panel on the right-hand side further shows a far greater impact caused by fossil fuel, etc., in particular by the use of natural gas for heating buildings, generating electricity, etc.

Methane's one-year GWP is 200

The image below shows a trendline that is based on IPCC AR5 data that were similarly updated by 14% and that indicates that methane's one-year GWP is 200. 


Methane Levels Rising Rapidly

NOAA data show that methane's global mean for November 2020 was 1891.9 ppb, i.e. 16.3 ppb above the 1875.6 ppb global mean for November 2019. 

Social Cost of Methane

In a January 2021 executive order, President Biden called - among other things - for an update of the 'social cost of methane', to take account of climate risk, of environmental justice, and of intergenerational equity, and to have a dollar figure for agencies to use when monetizing the value of changes in greenhouse gas emissions resulting from regulations and other relevant agency actions. 

Of course, it should be painfully clear by now that the unfolding climate collapse is an existential threat, making it obviously and vitally important to act on methane. We simply cannot afford to delay action, we cannot afford to do so financially nor in any other way. So, what can and should be done?

Above suggestion to take strong action was posted Nov. 9, 2020 at facebook

Even when issuing a mandate, e.g., for a rapid transition to clean, renewable energy, the question remains how this is best implemented. To what extent could bans help speed up the necessary transition to clean, renewable energy? Examples are banning cars from entering (parts of) cities, banning the construction of new coal-fired power plants, banning fracking and banning natural gas hookups in new construction.

Image from the 2014 post Biochar Builds Real Assets
The Climate Plan likes local communities to decide what works best in their area, while recommending local feebates as the preferred policy tool. Indeed, fees that are set high enough can effectively ban specific alternatives. Furthermore, instead of using money, local councils could add extra fees to rates for land where soil carbon falls, while using all the revenues for rebates on rates for land where soil carbon rises; that way, biochar effectively becomes a tool to lower rates, while it will also help improve the soil's fertility, its ability to retain water and to support more vegetation.
That way, real assets are built.

We cannot afford to delay action

Mean global carbon dioxide was 413.28 ppm in November 2020. Mean global methane was 1891.9 ppb in November 2020, which at a 1-year GWP of 200 is 378.38 ppm CO₂e. Together, CO₂ and methane add up to 791.66 ppm CO₂e, which is 408.34 ppm CO₂e away from the 1200 ppm CO₂e clouds tipping point.

This 408.34 ppm CO₂e translates into a methane equivalent of 2042 ppb of methane (again using a 1-year GWP of 200), in other words, it would add about 5 Gt of methane, an amount similar to the methane that is aready in the atmosphere now.

Such a methane burst of about 5 Gt alone could suffice to raise the CO₂e level to 1200 ppm and trigger a further 8°C global temperature rise due to the clouds feedback.

How likely is a large methane burst? Remember the warnings by Natalia Shakhova et al., who more than a decade ago concluded abrupt release of up to 50 Gt from the vast amounts of methane stored in the form of hydrates and free gas to be highly possible at any time. A recent study found methane leaking from a large pool of deep, preformed methane, indicating a large potential for abrupt future releases.

Keep in mind that the clouds feedback could also be triggered with a much smaller methane burst, since such an event would also come with a collapse in industrial activity and the associated fall in sulfate cooling, numerous additional feedbacks, and huge rises in greenhouse gas emissions, next to the temperature rise due to such a methane burst itself. The total potential rise in global air temperature at land-ocean surface level from 1750 to 2026 could be 18°C when including the clouds feedback. Also keep in mind that humans will likely go extinct with a 3°C rise and most life on Earth will disappear with a 5°C rise.


High peak levels

Ominously, some very high peak levels were recently recorded by the MetOp-1 satellite in the afternoon at 469 mb, i.e. 2930 ppb on March 3 and 2878 ppb on March 4.


As discussed in an earlier post, next to seafloor methane, there are further warming elements that could contribute to a rapid acceleration of the temperature rise.

Conclusion

The situation is dire and calls for immediate, comprehensive and effective action as described in the Climate Plan.


Links

• Climate Plan
https://arctic-news.blogspot.com/p/climateplan.html

• IPCC special report Climate Change and Land
https://www.ipcc.ch/report/srccl

• IPCC Report Climate Change and Land
https://arctic-news.blogspot.com/2019/08/ipcc-report-climate-change-and-land.html

• Radiative forcing of carbon dioxide, methane, and nitrous oxide: A significant revision of the methane radiative forcing - by Maryam Etminan et al. (2018)
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016GL071930

• IPCC keeps feeding the addiction
https://arctic-news.blogspot.com/2018/10/ipcc-keeps-feeding-the-addiction.html

• How much warming have humans caused?
https://arctic-news.blogspot.com/2016/05/how-much-warming-have-humans-caused.html

• Most Important Message Ever
https://arctic-news.blogspot.com/2019/07/most-important-message-ever.html

• January 2021 executive order by President Biden on Protecting Public Health and the Environment and Restoring Science to Tackle the Climate Crisis

• NOAA mean global carbon dioxide
https://www.esrl.noaa.gov/gmd/ccgg/trends/gl_data.html

• Why stronger winds over the North Atlantic are so dangerous
https://arctic-news.blogspot.com/2020/02/why-stronger-winds-over-north-atlantic-are-so-dangerous.html

• Feedbacks in the Arctic
https://arctic-news.blogspot.com/p/feedbacks.html

• When will we die?
https://arctic-news.blogspot.com/2019/06/when-will-we-die.html

• A rise of 18°C or 32.4°F by 2026?
https://arctic-news.blogspot.com/2019/02/a-rise-of-18c-or-324f-by-2026.html

• Methane Hydrates Tipping Point threatens to get crossed
https://arctic-news.blogspot.com/2020/08/methane-hydrates-tipping-point-threatens-to-get-crossed.html

• Arctic Hit By Ten Tipping Points
https://arctic-news.blogspot.com/2020/04/arctic-hit-by-ten-tipping-points.html

• Crossing the Paris Agreement thresholds
https://arctic-news.blogspot.com/p/crossing.html

• 2°C crossed
https://arctic-news.blogspot.com/2020/03/2c-crossed.html

• Most Important Message Ever
https://arctic-news.blogspot.com/2019/07/most-important-message-ever.html

• Blue Ocean Event
https://arctic-news.blogspot.com/2018/09/blue-ocean-event.html

• Record Arctic Warming
https://arctic-news.blogspot.com/2016/04/record-arctic-warming.html

• There is no time to lose
https://arctic-news.blogspot.com/2020/11/there-is-no-time-to-lose.html

• Warning of mass extinction of species, including humans, within one decade
https://arctic-news.blogspot.com/2017/02/warning-of-mass-extinction-of-species-including-humans-within-one-decade.html

• Extinction
https://arctic-news.blogspot.com/p/extinction.html

• Frequently Asked Questions: How much methane is stored in hydrates and how much of this could be released, say, within a few years?

• Source apportionment of methane escaping the subsea permafrost system in the outer Eurasian Arctic Shelf - by Julia Steinbach et al.

• 2020: Hottest Year On Record

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