Record Arctic Warming

On April 3rd, 2016, Arctic sea ice extent was at a record low for the time of the year, reports the National Snow and Ice Data Center (NSIDC).

The image below, created with an image from the JAXA site, gives an update on sea ice extent.

Besides sea ice extent, sea ice area is important. For more on what constitutes "ice-covered" and what is sea ice extent (versus sea ice area), see this NSIDC FAQ page.

Another measure is sea ice area. On April 2nd, 2016, Northern Hemisphere sea ice area was at a record low for the time of the year, reports the Cryosphere Today.

In 2015, there still was more sea ice area than there is now when it was half a month later (15 days) into the year. In 2012, there still was more sea ice when it was 25 days later in the year. In other words, sea ice area decline is almost one month ahead compared with the situation in 2012.

NSIDC scientist Andrew Slater has created the chart below of freezing degree days in 2016 compared to other years at Latitude 80°N. See Andrew's website and this page for more on this.

The Arctic has warmed more than elsewhere on Earth. Surface temperatures over the past 365 days were more than 2.5°C or 4.5°F higher than they were in 1981-2010.

The image below compares sea ice thickness on April 3rd for the years 2012, 2015 and 2016 (respectively the left, center and right panel).

Sea ice thickness has fallen dramatically over the years, as illustrated by the image on the right, from NSIDC, showing Arctic sea ice age for the week from March 4 to 10, from 1985 to 2016.

The high temperatures that have hit the Arctic Ocean over the past 365 days make that the outlook for the sea ice in the Arctic this year is not good.

As illustrated by the image on the right, the current El Niño is still going strong, with temperatures above 100°F recorded in three continents.

The year 2016 is already shaping up as the warmest year on record by far.

Temperatures look set to soar over the coming months, over the Northern Hemisphere at large and over the Arctic in particular.

The image below shows that over a 90-day period from January 13, 2016, to April 11, 2016, most of the Arctic Ocean was more than 6°C (10.8°F) warmer than 1981-2011.

The DMI image below shows recent melting in Greenland up to April 11, 2016. Maps in the left panel show areas where melting has taken place on April 10 and April 11, 2016. The chart in the right panel shows 2016 melting (blue line), against the 1990-2013 average (the vertical axis reflects the percentage of the total area of the ice where the melting occurred).

As a recent study confirms, ice sheets can contain huge amounts of methane in the form of hydrates and free gas. Much methane can escape due to melting and fracturing during wild weather swings.

Rapid melting on Greenland looks set to continue. The forecast for April 12, 2016 (0000 UTC), on the right shows temperature anomalies at the top end of the scale (20°C or 36°F) over most of Greenland and Baffin Bay, while the Arctic as a whole is hit by a temperature anomaly of over 5°C (over 9°F), compared to 1979-2000.

Furthermore, ocean temperatures are currently very high. These high temperatures, together with the poor condition of the sea ice, make that chances are that the sea ice will be largely gone by September 2016.

[ click on images to enlarge them ]

The image on the bottom right shows sea surface temperature anomalies above Latitude 60°N on April 4, 2016.

The image below shows that, on April 7, 2016, sea surface in the Barents Sea was as warm as 10.1°C or 50.2°F, an anomaly of 9.4°C or 16.9°F from 1981-2011 (at the location marked by the top right green circle), while there were anomalies as high as 11.3°C or 20.3°F off the coast of North America (green circle bottom left).

The white line shows the approximate path of the cold exit current, while the red line shows the approximate path of the warm entry current.

The high temperatures in the Barents Sea give an indication of the ocean heat traveling toward the Arctic Ocean, while the high temperature anomalies off the east coast of North America give an indication of the heat that is building up there. Much of this heat will make its way to the Arctic Ocean over the coming months

April 11, 2016: SST anomalies as high as 11.6°C or 20.8°F

In the Pacific, sea surface temperature anomalies from 1981-2011 were as high as 11.6°C or 20.8°F near Japan on April 11, 2016 (see image right), giving a further indication of the huge amount of additional heat that there now is in oceans on the Northern Hemisphere. The prospect is that temperatures will rise over the next few months to levels even higher than they were last year (see earlier post on temperatures in June 2015).

Sea ice acts as a buffer, absorbing heat and keeping the temperature of the water at freezing point. Without such a buffer, further heat will instead make that the temperature of the water will rise rapidly. Furthermore, less sea ice means that less sunlight gets reflected back into space and more sunlight instead gets absorbed by the Arctic Ocean.

These are just some of the many feedbacks that accelerate warming in the Arctic. Warm water reaching the seafloor of the Arctic Ocean can penetrate sediments that can contain huge amounts of methane in the form of hydrates and free gas, triggering abrupt release of methane in gigantic quantities, escalating into runaway warming, and subsequent destruction and extinction at massive scale.

On a 10-year timescale, the current global release of methane from all anthropogenic sources already exceeds all anthropogenic carbon dioxide emissions as agents of global warming; that is, methane emissions are more important than carbon dioxide emissions for driving the current rate of global warming.

Above image shows that growth in methane levels has been accelerating recently; a trendline points at a doubling of methane levels by the year 2040. Unlike carbon dioxide, methane's GWP does rise as more of it is released. Methane's lifetime can be extended to decades, in particular due to depletion of hydroxyl in the atmosphere.

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

Albert Kallio comments: 
More could have been added from the last National Snow and Ice Data Center (NSIDC) Arctic sea ice report for March, the general outlook for massive sea ice loss because the near-all-time record low marine snow and ice cover is coinciding with near-all-time record low terrestrial snow cover. NSIDC forecast that due to dark surfaces being so high, this easily leads to loss of sea ice. In fact, 2016 situation is even worse that it was previous record loss 2012 when snow cover was much larger. Same in 2007 when the sea ice area was slighly smaller, there was much larger terrestrial snow cover. Furthermore, neither 2007 nor 2012 occurred during strong El Nino like 1998. El Nino 2015-2016 is the strongest ever, also accompanied by the very warm Indian Ocean, Atlantic Ocean, and Southern Ocean around Antarctica. At times Antarctic sea water temperatures were also high leading to second smallest Austral summer sea ice at one point. Sea ice area also around Antarctica has been smaller than average most of time, despite increased melt water and reduced salinity - due to high temperatures. All these additional factors should be added into your conclusions without forgetting to mention that the added heat in the earth system is ripping the Polar Vortex apart as the jet streams have started to blend into other irregular atmospheric wind patters. Note also the increased flow of sea ice through the Fram Strait due to lowered spatial viscosity of sea ice that also results from larger wave action, vertical mixing of ocean by wind, thinner sea ice breaking easier apart and collapsing into pack ice, as well as being mostly seasonal ice (containing trace amounts of salts that make the chemical bounds in ice crystals weaker and fragile and melting easier), May be you can update and rejoice on NSIDC's March 2016 report noting all the points therein..

February Temperature

The February 2016 land and ocean temperature anomaly was 1.35°C (2.43°F) above the average temperature in the period from 1951 to 1980, as above image shows (Robinson projection).

On land, it was 1.68°C (3.02°F) warmer in February 2016, compared to 1951-1980, as the image below shows (polar projection).

The image below combines the above two figures in two graphs, showing temperature anomalies over the past two decades.

Below are the full graphs for both the land-ocean data and the land-only data. Anomalies on land during the period 1890-1910 were 0.61°C lower compared to the period from 1951 to 1980, which is used as a reference to calculate anomalies. The blue line shows land-ocean data, while the red line shows data from stations on land only.

At the Paris Agreement, nations committed to strengthen the global response to the threat of climate change by holding the increase in the global average temperature to well below 2°C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5°C above pre-industrial levels.

To see how much temperatures have risen compared to pre-industrial levels, a comparison with the period 1951-1980 does not give the full picture. The image below compares the February 2016 temperatures with the period from 1890 to 1910, again for land only.

Since temperatures had already risen by ~0.3°C (0.54°F) before 1900, the total temperature rise on land in February 2016 thus is 2.6°C (4.68°F) compared to the start of the industrial revolution.

There are a number of elements that determine how much the total temperature rise on land will be, say, a decade from now:

Rise 1900-2016: In February 2016, it was 2.3°C (4.14°F) warmer on land than it was in 1890-1910.

Rise before 1900: Before 1900, temperature had already risen by ~0.3°C (0.54°F), as Dr. Michael Mann points out (see earlier post).

Rise 2016-2026: If levels of carbon dioxide and further greenhouse gases do keep rising, there will additional warming over the next ten years. Even with dramatic cuts in carbon dioxide emissions, temperatures can keep rising, as maximum warming occurs about one decade after a carbon dioxide emission, so the full wrath of the carbon dioxide emissions over the past ten years is still to come. Moreover, mean global carbon dioxide grew by 3.09 ppm in 2015, more than in any year since the record started in 1959, prompting an earlier post to add a polynomial trendline that points at a growth of 5 ppm by 2026 (a decade from now). This growth took place while global energy-related CO2 emissions have hardly grown over the past few years, indicating that land and oceans cannot be regarded as a sink, but should be regarded as source of carbon dioxide. On land, carbon dioxide may be released due to land changes, changes in agriculture, deforestation and extreme weather causing droughts, wildfires, desertification, erosion and other forms of soil degradation. Importantly, this points at the danger that such emissions will continue to grow as temperatures keep rising. New studies on permafrost melt (such as this one and this one) show that emissions and temperatures can rise much faster in the Arctic than previously thought. Furthermore, a 2007 study found a 25% soil moisture reduction to result in 2°C warming. Altogether, the rise over the next decade due to such emissions may be 0.2°C or 0.36°F (low) to 0.5°C or 0.9°F (high).

Removal of aerosols: With the necessary dramatic cuts in emissions, there will also be a dramatic fall in aerosols that currently mask the full warming of greenhouse gases. From 1850 to 2010, anthropogenic aerosols brought about a decrease of ∼2.53 K, says a recent paper. In addition, more aerosols are likely to be emitted now than in 2010, so the current masking effect of aerosols may be even higher. Stopping aerosol release may raise temperatures by 0.4°C or 0.72°F (low) to 2.5°C or 4.5°F (high) over the next decade, and when stopped abruptly this may happen in a matter of weeks.

Albedo change: Warming due to Arctic snow and ice loss may well exceed 2 W per square meter, i.e. it could more than double the net warming now caused by all emissions by people of the world, as Professor Peter Wadhams calculated in 2012. The temperature rise over the next decade due to albedo changes as a result of permafrost and sea ice decline may be 0.2°C or 0.36°F (low) to 1.6°C or 2.9°F (high).

Methane eruptions from the seafloor: ". . . we consider release of up to 50 Gt of predicted amount of hydrate storage as highly possible for abrupt release at any time," Dr. Natalia Shakhova et al. wrote in a paper presented at EGU General Assembly 2008. Authors found that such a release would cause 1.3°C warming by 2100. Such warming from an extra 50 Gt of methane seems conservative when considering that there now is only some 5 Gt of methane in the atmosphere, and over a period of ten years this 5 Gt is already responsible for more warming than all the carbon dioxide emitted by people since the start of the industrial revolution. The temperature rise could be higher, especially in case of large abrupt release, but in case of small and gradual releases much of the methane may be broken down over the years. The temperature rise due to seafloor methane over the next decade may be 0.2°C or 0.36°F (low) to 1.1°C or 2°F (high).

Water vapor feedback: "Water vapour feedback acting alone approximately doubles the warming from what it would be for fixed water vapour. Furthermore, water vapour feedback acts to amplify other feedbacks in models, such as cloud feedback and ice albedo feedback. If cloud feedback is strongly positive, the water vapour feedback can lead to 3.5 times as much warming as would be the case if water vapour concentration were held fixed", according to the IPCC. In line with the above elements, this may result in a temperature rise over the next decade of 0.2°C or 0.36°F (low) to 2.1°C or 3.8°F (high).

The image below puts all these elements together in two scenarios, one with a relatively low temperature rise of 3.9°C (7.02°F) and another one with a relatively high temperature rise of 10.4°C (18.72°F).

Note that the above scenarios assume that no geoengineering will take place.

The 2.3°C warming used in above image isn't the highest figure offered by the NASA site. An even higher figure of 2.51°C warming can be obtained by selecting a 250 km smoothing radius for the on land data.

When adding the 0.3°C that temperatures rose before 1900, the rise from the start of the industrial revolution is 2.81°C (5.06°F), as illustrated by the image on the right.

The image also shows that this is the average rise. At specific locations, it is as much as 16.6°C (30°F) warmer than at the start of the industrial revolution.

Furthermore, temperatures are higher on the Northern Hemisphere than on the Southern Hemisphere. This is illustrated by the image below showing NASA temperature anomalies for January 2016 (black) and February 2016 (red) on land on the Northern Hemisphere. The data show that it was 2.36°C (4.25°F) warmer in February 2016 compared to 1951-1980.

How much of the rise can be attributed to El Niño? The added trendlines constitute one way to handle variability such as caused by El Niño and La Niña events and they can also indicate how much warming could be expected to eventuate over the years to come.

The February trendline also indicates that the temperature was 0.5°C lower in 1900 than in 1951-1980, so the total rise from 1900 to February 2016 is 2.86°C (5.15°F). Together with a 0.3°C rise before 1900, this adds up to a rise on land on the Northern Hemisphere of 3.16°C (5.69°F) from pre-industrial levels to February 2016. Most people on Earth live on land on the Northern Hemisphere. In other words, most people are already exposed to a temperature rise that is well above any guardrails that nations at the Paris Agreement pledged would not be crossed.

Temperatures may actually rise even more rapidly than these trendlines indicate. As above image illustrates, the largest temperature rises are taking place in the Arctic, resulting in a rapid decline of snow and ice cover and increasing danger that large methane eruptions from the seafloor will take place, as illustrated by the image on the right, from an earlier post. This could then further lead to more water vapor, while the resulting temperature rises also threaten to cause more droughts, heatwaves and wildfires that will cause further emissions, as well as shortages of food and fresh water supply in many areas.

Adding the various elements as discussed above indicates that most people may well be hit by a temperature rise of 4.46°C or 8.03°F in a low rise scenario and of 10.96°C or 19.73°F in a high rise scenario, and that would be in one decade from February 2016. Since it is now already March 2016, that is less than ten years from now.

The image below shows highest mean methane readings on one day, i.e. March 10, over four years, i.e. 2013, 2014, 2015 and 2016, at selected altitudes in mb (millibar). The comparison confirms that the increase of methane in the atmosphere is more profound at higher altitudes, as discussed in earlier posts. This could indicate that methane from the Arctic Ocean is hardly detected at lower altitudes, as it rises in plumes (i.e. very concentrated), while it will then spread and accumulate at higher altitudes and at lower latitudes.

The conversion table below shows the altitude equivalents in mb, feet and m.

57016 feet	44690 feet	36850 feet	30570 feet	25544 feet	19820 feet	14385 feet	8368 feet	1916 feet
17378 m	13621 m	11232 m	9318 m	7786 m	6041 m	4384 m	2551 m	584 m
74 mb	147 mb	218 mb	293 mb	367 mb	469 mb	586 mb	742 mb	945 mb

Meanwhile Arctic sea ice area remains at a record low for the time of the year, as illustrated by the image below.

Next to rising surface temperatures in the Arctic, ocean temperature rises on the Northern Hemisphere also contribute strongly to both Arctic sea ice decline and methane releases from the seafloor of the Arctic Ocean, so it's important to get an idea how much the Northern Hemisphere ocean temperature can be expected to rise over the next decade. The NOAA image below shows a linear trend over the past three decades that is rising by 0.19°C per decade.

The image below, using the same data, shows a polynomial trend pointing at a 1.5°C rise in ocean temperature on the Northern Hemisphere over the next decade.

Below is another version of above graph.

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

Interview with Paul Beckwith

1) Hi Paul. Thanks for agreeing to do this interview. First of all, could you tell us a bit about your background, how long you’ve been involved in climate science, and what areas of climatology you specialize in?

Hello Sam. Thank you. It is my pleasure to have this interview with you.

I am an Engineer with a Bachelor of Engineering Degree in Engineering Physics (often called Engineering Science) from McMaster University in Hamilton, Ontario, Canada. I finished at the top of my class and received many scholarships and awards during my studies. My CV can be found on my website http://paulbeckwith.net under the About Me section.

I am a Physicist with a Master of Science Degree in Laser Physics. My research area was blowing molecules apart with high-powered CO2 lasers and measuring all the chunks flying off with low-power tunable diode lasers. This involved the science of molecular spectroscopy in the infrared region.

I worked in industry for many years, as a Product Line Manager for optical switching devices in high speed fiber optic communication systems, on high powered Excimer laser research and tunable laser research, and also on software quality assurance for various tech companies.

I have been interested in climate science my entire life. I decided to formally study it after becoming concerned with the lack of urgency by the public, scientists (literally everybody) about 6 years ago or so.

I am a part time professor in the Laboratory for Paleoclimatology in the Geography Department at the University of Ottawa. I have taught many courses including climatology, meteorology, oceanography and the geography of environmental issues. My research work in my PhD program is abrupt climate system change in the past and present, to determine what will happen in the near future. I am very active on educating the public about the grave dangers that we face from abrupt climate change, using primarily videos and blogs and public talks (see my website link above). My research is self-funded, apart from my teaching, and I greatly welcome financial contributions at the Please Donate button on the main task bar on my website.

2) It’s clear that the Arctic is melting rapidly and this trend is likely to continue. When do you predict the Arctic will start to have ice-free conditions? At what point during the year will it disappear, and how long for? How will these conditions develop in future decades, and could we reach a point where the Arctic is free of ice all year round?

I think that the Arctic will start to have ice-free conditions at the end of the melt season (Septembers) as early as 2020 or before (possibly even the summer of 2016). It is hard to predict a single year, since the loss of Arctic sea ice greatly depends on local Arctic wind and ocean conditions in the summer melt season. These local conditions determine how much ice is lost to export via the Fram Strait and Nares Strait, which makes a huge difference to ice loss amounts during the Northern summer period. When there is less than 1 million square kilometers of sea ice left, we have essentially a “blue-ocean” event in the Arctic.

For the sake of argument, lets pick September, 2020, for the first “blue-ocean” event in the Arctic (essentially no sea ice left). This would occur for about a month, call it the month of September. Within 2 or 3 years it is highly likely that the duration of this “blue-ocean” state would be 3 months or say, thus occur for August, September and October in 2023. Within an additional few years, say by 2025 it is highly likely that the “blue-ocean” event would be extended for another few additional months, and we would have ice free conditions from July through to and including November; namely for 5 months of the year. Then, within a decade or two from the initial 2020 event we can expect to have an ice free “blue-ocean” Arctic year round; that would be some year between 2030 and 2040.

Of course if the first “blue-ocean” event occurred in 2016 this timeline would be advanced accordingly.

3) In recent years, there’s been a lot of talk about methane eruptions in the Arctic and Siberia. How serious is this, in terms of its potential for adding to global warming? Can you give us some idea of the timescales involved? What’s the level of certainty about these future effects?

Once the Arctic is essentially ice free for ever increasing durations in the summer months, and then over the entire year there are two enormous feedback risks that we face. Methane and Greenland.

Methane is the mother of all risks. The Russians have measured large increases in emissions from the continental shelf seabed in the Eastern Siberian Arctic Shelf (ESAS). Over the timespan of a few years they observed that methane bubbled up in vast numbers of plumes that increased in size from tens of meters in diameter to hundreds and even thousands of meter diameter plumes in the shallow regions of ESAS. Global atmospheric levels of methane are rapidly rising, and although they average about 1900 ppb or so there have been readings over 3100 ppb in the atmosphere over the Arctic. Since the Global Warming Potential (GWP) of methane versus carbon dioxide is 34x, 86x and close to 200x on timescales of 100 years, 20 years and a few years, respectively a large burst of methane can virtually warm the planet many degrees almost overnight.

Recently, we have passed about 405 ppm of CO2, with a record rise of 3.09 ppm in 2015 alone. When accounting for methane and other greenhouse gases (GHGs) and putting them into CO2-equivalent numbers, we are at about 490 ppm CO2 – equivalent. We are literally playing with fire, and the outcome will not be pretty.

Greenland ice melt is the next enormous feedback risk. When we lose snow and ice in the Arctic, and the cascading feedbacks like albedo-destruction kick in, and the methane comes out then the enormous warming over Greenland and in the water around and under the Greenland ice will viciously destroy the ice there and greatly accelerate sea level rise. I refer people to my video from several years ago on the great risk of realizing 7 meters of global sea level rise by 2070 from Greenland and Antarctica melt.

The level of certainty over these future effects is close to 100% if we continue to be stupid and do nothing. If we are smart we need to have a Manhattan – Marshall plan like emergency status to:
a) Zero emissions as-soon-as-possible, i.e. by 2030;
b) Cool the Arctic to keep the methane in place and restore jet stream stability; and
c) Remove CO2 from the atmosphere/ocean system and remove methane from the atmosphere.
There is no other choice. I use the metaphor of a three legged bar stool with legs a), b) and c) as above.

Barstool approach (slightly different from text in that SRM and methane
removal are included with adaptation and conservation in bottom leg)

4) What new satellites, monitoring stations, and other science projects are being planned for the future (if any)? How will these improve our knowledge of the Arctic and the various climatic processes in the region?

NASA, the ESA and the Russians and Chinese are always launching new satellite with better high tech sensors to gather more information on the changes in the Earth System. We need to have a massive increase in scientific study in the Arctic to better quantify what is happening there. However, we know enough to see that if we do not deploy the three-legged barstool approach immediately then our chances are halting our ongoing abrupt climate change will vanish, and emissions from the Earth System will dwarf all cumulative anthropogenic emissions throughout human history. We need the US military budget of $700 to $800 billion dollars per year to be applied to saving human civilization from abrupt climate change.

5) What can be done to save the Arctic and reverse the melting trend? How long would it take to restore the ice cover to, say, mid-20th century levels? Is this even possible with current technology?

We must cool the Arctic as soon as possible using Solar Radiation Management (SRM) technologies. We can deploy SRM very quickly if we treat this Arctic temperature amplification as an existential threat to humanity and put billions of dollars into deployment. It will take many years, perhaps a decade to restore the ice cover but we must start now. If we wait until we have “blue-ocean” events before we deploy then our ability to restore the ice will be much harder and perhaps even futile.

Deployment is possible with current technology. I am specifically referring to Marine Cloud Brightening (MCB) methods. I am working today with people on these technologies.

6) How does the melting in the Arctic compare to its southern polar opposite, the Antarctic?

The Arctic is rapidly losing snow cover (mostly in the spring months) and sea ice cover, and is thus the average albedo (reflectivity) of the region is rapidly decreasing. This if feeding back into additional Arctic Temperature Amplification and further darkening and warming, until we have no snow and ice in the region. These vicious feedback cycles have not kicked in to the same extent in the Antarctic. The ice cap there is losing ice causing a rise in sea level mostly from the warming of the seawater undercutting the ice on land that is grounded below sea level. However, since the Arctic is warming so fast due to increased solar radiation absorption (from darkening) there is less heat transported there via the atmosphere and oceans. Thus, jet streams and ocean currents are slowing. Thus, more heat is moving from the equator to the southern hemisphere, making it to Australian latitudes and increasing the temperature gradient to Antarctica and thus increasing the speed of the jet streams there.

7) Finally, what’s your message to climate change deniers who reject the science and believe the whole thing is a giant hoax?

Climate change deniers cannot be tolerated by society any longer. They are threatening the future of everybody on our planet. Send them all to Guantanamo for intensive and mandatory climate science basic training, and when they get clued in they can be reintroduced into society.

Interview with Paul Beckwith http://arctic-news.blogspot.com/2016/03/interview-with-paul-beckwith.html
Posted by Sam Carana on Saturday, March 12, 2016

Ten Degrees Warmer In A Decade?

In 2015, mean global carbon dioxide grew by 3.09 parts per million (ppm), more than in any year since the record started in 1959. An added polynomial trendline points at a growth of 5 ppm by 2026 (a decade from now) and of 6 ppm by 2029.

NOAA data, added trend points at 5 ppm growth a decade from now

There are a number of elements that determine how much the total temperature rise will be, say, a decade from now:

Rise 1900-2016: In January 2016, it was 1.92°C (3.46°F) warmer on land than in January 1890-1910, as discussed in an earlier post that also featured the image below.

Rise before 1900: Before 1900, temperature had already risen by ~0.3°C (0.54°F), as Dr. Michael Mann points out.

Rise 2016-2026: The image at the top shows a trend pointing at 5 ppm growth a decade from now. If levels of carbon dioxide and further greenhouse gases keep rising, then that will account for additional warming over the next ten years. Even with dramatic cuts in carbon dioxide emissions, temperatures will keep rising, as maximum warming occurs about one decade after a carbon dioxide emission, so the full wrath of the carbon dioxide emissions over the past ten years is still to come.

Removal of aerosols: With dramatic cuts in emissions, there will also be a dramatic fall in aerosols that currently mask the full warming of greenhouse gases. From 1850 to 2010, anthropogenic aerosols brought about a decrease of ∼2.53 K, says a recent paper. In addition, people will have emitted a lot more aerosols since 2010.

Albedo change: Warming due to Arctic snow and ice loss may well exceed 2 W per square meter, i.e. it could more than double the net warming now caused by all emissions by people of the world, calculated Professor Peter Wadhams in 2012.

Methane eruptions from the seafloor: ". . . we consider release of up to 50 Gt of predicted amount of hydrate storage as highly possible for abrupt release at any time," Dr. Natalia Shakhova et al. wrote in a paper presented at EGU General Assembly 2008. Authors found that such a release would cause 1.3°C warming by 2100. Note that such warming from an extra 50 Gt of methane seems conservative when considering that there now is only some 5 Gt of methane in the atmosphere, and over a period of ten years this 5 Gt is already responsible for more warming than all the carbon dioxide emitted by people since the start of the industrial revolution.

Water vapor feedback: Water vapour feedback acting alone approximately doubles the warming from what it would be for fixed water vapour. Furthermore, water vapour feedback acts to amplify other feedbacks in models, such as cloud feedback and ice albedo feedback. If cloud feedback is strongly positive, the water vapour feedback can lead to 3.5 times as much warming as would be the case if water vapour concentration were held fixed, according to the IPCC.

The image below puts these elements together in two scenarios, one with a relatively low temperature rise of 3.5°C (6.3°F) and another one with a relatively high temperature rise of 10°C (18°F).

Temperature rise on land a decade from now (without geoengineering)

Note that the above scenarios assume that no geoengineering will take place within a decade.

[ click on images to enlarge ]

As described above, the January 2016 temperature anomaly on land compared to January 1890-1910 was 1.92°C (3.46°F). Globally, the anomaly was 1.53°C (2.75°F), as shown by the image top right.

Putting the elements together for two global scenarios will result in a total rise of 3.11°C (5.6°F) for a relatively low global temperature rise and 9.61°C (17.3°F) for a relatively high global temperature rise, as shown by the image bottom right.

So, will climate catastrophe occur in a decade or later? There are many indications that the odds are large and growing rapidly. Some say climate catastrophe is inevitable or is already upon us. Others may like to believe the odds were rather small. Even so, the magnitude of the devastation makes it imperative to start taking comprehensive and effective action now.

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

In 2015, mean global CO2 grew by 3.09 parts per million, more than in any year since the record started in 1959. An...
Posted by Sam Carana on Wednesday, March 9, 2016