Arctic News: carbon dioxide

Showing posts with label carbon dioxide. Show all posts

Saturday, March 12, 2022

Methane rise is accelerating

NOAA's globally averaged marine surface monthly mean methane reading for November 2021 of 1909.3 parts per billion (ppb) is 17.6 ppb higher than the reading for November 2020. By comparison, NOAA's annual global mean methane increase of 15.57 ppb for 2020 was at the time the highest on record.

Keep in mind that this 1909.3 ppb reading is for November 2021; it now is March 2022. Furthermore, NOAA's data are for marine surface measurements; more methane tends to accumulate at higher altitudes.

The image below shows that the MetOp-B satellite recorded a mean methane level of 1936 ppb at 321 mb on March 7, 2022 pm.

Carbon dioxide

Carbon dioxide levels are currently very high over the Arctic, as illustrated by the image below that shows carbon dioxide levels approaching 430 parts per million (ppm) recently at Barrow, Alaska.

Clouds tipping point

[ from earlier post ]

The danger is that high greenhouse gas levels could combine to push the carbon dioxide equivalent (CO₂e) level over the 1200 ppm clouds tipping point, at first in one spot, causing low-altitude clouds in various neighboring areas to break up there, and then propagating break-up of clouds in further areas, as discussed at the clouds feedback page.

The MetOp-B satellite recorded a mean methane level of 1958 ppb on October 25, 2021 am at 295 mb. When using a 1-year GWP of 200, this translates into 391.6 ppm CO₂e. Together with a global mean CO₂ level of 420 ppm, that's 811.6 ppm CO₂e, i.e. only 388.4 ppm CO₂e away from the 1200 ppm CO₂e clouds tipping point.

The image on the right shows a trend based pointing at a methane level of almost 4000 ppb by end 2026, from an earlier post.

Alternatively, an additional 5 Gt of methane from abrupt release from the seafloor could raise the global mean methane concentration by about 2000 ppb, and even earlier than 2026.

At a 1-year GWP of 200, an extra 2000 ppb would translate into an extra 400 ppm CO₂e, thus pushing the joint impact of just two greenhouse gases (carbon dioxide and methane) above the 1200 ppm CO₂e clouds tipping point and raising the global temperature by 8°C due to the clouds feedback alone, i.e. on top of the additional rise caused by other warming elements, as further discussed below.

Seafloor methane eruptions could trigger a huge temperature rise

Warnings about the potential for seafloor methane releases have been given repeatedly, such as in this 2017 analysis, in this 2019 analysis (image below) and in a recent analysis (2022). Researchers in 2019 found amounts of methane in the air over the East Siberian Sea up to nine times the global average.

A 2021 analysis indicates that massive methane seepage from the seafloor of the Arctic Ocean occurred during ice sheet wastage over the last and penultimate deglaciation periods (i.e. the Holocene, ~20-15 ka, respectively the Eemian, ~140-130 ka).

At the time, seafloor methane entering the atmosphere could be accommodated without resulting in huge temperature rises, because such releases were spread out over relatively long periods, while the level of methane in the atmosphere at the time was relatively low and since the lifetime of methane is limited to a decade or so.

Today, circumstances are much more dire in many respects. While high heat peaks may have occurred locally during the last and penultimate deglaciation, today's global mean temperature is higher, as James Hansen et al., confirmed in a 2017 analysis. Furthermore, a 2012 analysis indicates that oceanic heat transport to the Arctic today is higher.

Greenhouse gas levels are very high at the moment and their rise is accelerating. As a result of the rapidity of today's rise, new seafloor methane eruptions can occur while previous methane releases haven't yet been broken down in the atmosphere.

Seafloor methane eruptions can thus trigger a huge temperature rise, as illustrated by the image on the right, from the extinction page.

Conclusions

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

Links

• NOAA - globally averaged marine surface monthly mean methane data
https://gml.noaa.gov/webdata/ccgg/trends/ch4/ch4_mm_gl.txt

• NOAA - globally averaged marine surface annual mean methane growth rates
https://gml.noaa.gov/webdata/ccgg/trends/ch4/ch4_gr_gl.txt

• NOAA - Infrared Atmospheric Sounding Interferometer (IASI) Sounding Products (MetOp-B)
https://www.ospo.noaa.gov/Products/atmosphere/soundings/iasi

• NOAA - Trends in Atmospheric Carbon Dioxide
https://gml.noaa.gov/ccgg/trends/gl_trend.html

• NOAA - Carbon Cycle Gases, Barrow Atmospheric Baseline Observatory, United States
https://gml.noaa.gov/dv/iadv/graph.php?code=BRW

• NOAA - Trends in Atmospheric Carbon Dioxide, Mauna Loa, Hawaii
https://gml.noaa.gov/ccgg/trends/graph.html

• Clouds feedback
https://arctic-news.blogspot.com/p/clouds-feedback.html

• Human Extinction by 2022?
https://arctic-news.blogspot.com/2021/11/human-extinction-by-2022.html

• Terrifying Arctic methane levels
https://arctic-news.blogspot.com/2021/12/terrifying-arctic-methane-levels.html

• Terrifying Arctic methane levels continue
https://arctic-news.blogspot.com/2022/01/terrifying-arctic-greenhouse-gas-levels-continue.html

• Current rates and mechanisms of subsea permafrost degradation in the East Siberian Arctic Shelf - by Nataia Shakhova et al. (2017)
https://www.nature.com/articles/ncomms15872

• Understanding the Permafrost–Hydrate System and Associated Methane Releases in the East Siberian Arctic Shelf - by Nataia Shakhova et al. (2019)
https://www.mdpi.com/2076-3263/9/6/251

• CNN - Russian scientists say they've found the highest-ever 'flares' of methane in Arctic waters

https://edition.cnn.com/2019/10/12/us/arctic-methane-gas-flare-trnd/index.html

• In-situ temperatures and thermal properties of the East Siberian Arctic shelf sediments: Key input for understanding the dynamics of subsea permafrost - by Evgeny Chuvilin et al. (2022)
https://www.sciencedirect.com/science/article/abs/pii/S0264817222000289

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

• Arctic methane release due to melting ice is likely to happen again

https://www.geosociety.org/GSA/News/pr/2021/21-15.aspx

• Ice-sheet melt drove methane emissions in the Arctic during the last two interglacials - by Pierre-Antoine Dessandier et al. (2021)

https://pubs.geoscienceworld.org/gsa/geology/article-abstract/49/7/799/595627/Ice-sheet-melt-drove-methane-emissions-in-the

• Contrasting ocean changes between the subpolar and polar North Atlantic during the past 135 ka - by Henning Bauch et al. (2012)
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2012GL051800

• Young people's burden - by James Hansen et al.

https://esd.copernicus.org/articles/8/577/2017/esd-8-577-2017.html

• Extinction

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

• Climate Plan

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

Tuesday, February 15, 2022

Greenhouse gas levels keep rising at accelerating speed

Carbon dioxide

Carbon dioxide (CO₂) was 421.59 parts per million (ppm) at Mauna Lao, Hawaii, on February 14, 2022, a level unprecedented in millions of years.

Carbon dioxide levels typically reach their annual maximum in May, so even higher levels can be expected over the next few months.

Carbon dioxide levels are even higher at high latitudes north. The image below shows that carbon dioxide levels are approaching 430 ppm at Barrow, Alaska.

Methane

NOAA's monthly global mean reading for October 2021 for methane (CH₄) is 1907.2 parts per billion (ppb), which is 17.1 ppb higher than the reading for October 2020. By comparison, NOAA's annual global mean methane increase of 15.74 ppb for 2020 was the highest on record at the time and the increase for 2021 looks to be even higher.

[ from earlier post ]

Keep in mind that NOAA's data are for marine surface measurements; more methane tends to accumulate at higher altitudes.

Furthermore, keep in mind that the above 1907.2 ppb reading is for October 2021; it now is February 2022. The image below shows that recent methane levels are approaching 1940 ppb at Mauna Loa, Hawaii.

Similarly as carbon dioxide, methane levels are even higher at high latitudes north. Furthermore, the rise is accelerating strongly. At Barrow, Alaska, recent methane levels are approaching 2040 ppb.

Nitrous oxide

The image below shows the annual increase in globally-averaged nitrous oxide (N₂O).

The top part of the combination image below shows IPCC scenarios for nitrous oxide, as discussed in an earlier post, with the bottom part showing recent NOAA observations (through to October 2022).

Clouds feedback

As discussed in an earlier post, just two greenhouse gases, carbon dioxide and methane, could abruptly cause the joint CO₂e to cross the 1200 ppm clouds tipping point, triggering a further 8°C global temperature rise, due to the clouds feedback.

Again, that could be the result of the climate forcing just of carbon dioxide and methane, without even adding further forcing such as by nitrous oxide. Meanwhile, as discussed, humans will likely go extinct with a 3°C rise, and a 5°C rise will likely end most life on Earth.

Conclusion

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

Links

• NOAA - Mauna Loa, Hawaii
https://gml.noaa.gov/dv/iadv/graph.php?code=MLO&program=ccgg&type=ts

• NOAA - Barrow, Alaska
https://gml.noaa.gov/dv/iadv/graph.php?code=BRW&program=ccgg&type=ts

• Terrifying Arctic greenhouse gas levels continue

https://arctic-news.blogspot.com/2022/01/terrifying-arctic-greenhouse-gas-levels-continue.html

• NOAA - Nitrous oxide trends
https://gml.noaa.gov/ccgg/trends_n2o

• NOAA - Globally averaged marine surface monthly mean nitrous oxide data

https://gml.noaa.gov/webdata/ccgg/trends/n2o/n2o_mm_gl.txt

• Is the IPCC creating false perceptions, again?

https://arctic-news.blogspot.com/2021/08/is-the-ipcc-creating-false-perceptions-again.html

• Accelerating Methane Rise

https://arctic-news.blogspot.com/2022/02/accelerating-methane-rise.html

• Terrifying Arctic greenhouse gas levels continue

https://arctic-news.blogspot.com/2022/01/terrifying-arctic-greenhouse-gas-levels-continue.html

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

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

Tuesday, February 8, 2022

Accelerating Methane Rise

NOAA's October 2021 global mean methane reading is 1907.2 parts per billion (ppb), which is 17.1 ppb higher than the reading for October 2020. By comparison, NOAA's annual global mean methane increase of 15.74 ppb for 2020 was at the time the highest on record.

Keep in mind that this 1907.2 ppb reading is for October 2021; it now is February 2022. Furthermore, NOAA's data are for marine surface measurements; more methane tends to accumulate at higher altitudes.

The image below shows that the MetOp-B satellite recorded a peak methane level of 2904 ppb at 469 mb on February 4, 2022 am.

Methane levels are very high over the Arctic. The image below shows high recent monthly average methane levels at Barrow, Alaska.

Carbon dioxide levels over the Arctic are also very high. The image below shows high recent daily average carbon dioxide levels at Barrow, Alaska.

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

Links

• NOAA - globally averaged marine surface monthly mean methane data
https://gml.noaa.gov/webdata/ccgg/trends/ch4/ch4_mm_gl.txt

• NOAA - globally averaged marine surface annual mean methane growth rates
https://gml.noaa.gov/webdata/ccgg/trends/ch4/ch4_gr_gl.txt

• NOAA - Infrared Atmospheric Sounding Interferometer (IASI) Sounding Products (MetOp)
https://www.ospo.noaa.gov/Products/atmosphere/soundings/iasi

• NOAA - Carbon Cycle Gases, Barrow Atmospheric Baseline Observatory, United States
https://gml.noaa.gov/dv/iadv/graph.php?code=BRW

• NOAA - Trends in Atmospheric Carbon Dioxide, Mauna Loa, Hawaii
https://gml.noaa.gov/ccgg/trends/graph.html

• Human Extinction by 2022?
https://arctic-news.blogspot.com/2021/11/human-extinction-by-2022.html

• Terrifying Arctic methane levels
https://arctic-news.blogspot.com/2021/12/terrifying-arctic-methane-levels.html

• Terrifying Arctic methane levels continue
https://arctic-news.blogspot.com/2022/01/terrifying-arctic-greenhouse-gas-levels-continue.html

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

Wednesday, January 5, 2022

Terrifying Arctic greenhouse gas levels continue

NOAA's September 2021 global mean methane reading is 1900.5 parts per billion (ppb), which is 15.8 ppb higher than the reading for September 2020. By comparison, NOAA's annual global mean methane increase for 2020 of 15.74 ppb was at the time the highest on record.

Keep in mind that this 1900.5 ppb reading is for September 2021; it now is January 2022. Furthermore, NOAA's data are for marine surface measurements; more methane tends to accumulate at higher altitudes, and especially at higher latitudes North, as also illustrated by the images further below.

Above, a combination image of methane averages between latitudes 60°S and 60°N (top) and annual growth rates for these data (bottom) through to 2021, from a Copernicus news release.

The image on the right shows the Copernicus data for methane growth with an added trend that ominously points at a growth rate for 2022 that could be more than 20%.

Keep in mind that these are data for the latitude range from 60°S and 60°N, whereas some very high methane concentrations are being recorded over the area within the Arctic Circle (66°30′ N).

Very high greenhouse gas levels continue to show up over the Arctic. The image below, created with a Copernicus forecast for January 4, 2022, 03 UTC, shows methane at 500 hPa.

The image further down below is a screenshot of a Copernicus forecast for January 5, 2022, 03 UTC, again showing methane at 500 hPa, but this time using a North Pole projection.

The darkest-brown color on the scale for 500 hPa on the Copernicus images (above and below) indicates methane concentrations of 1950 ppb and higher.

While the Copernicus images show well that such concentrations (of 1950 ppb and higher) dominate over the Arctic at 500 hPa, the scales used by Copernicus have upper limits of 2300 ppb (300 hPa), 2360 (500 hPa) and 2320 (total column) which could give the false impression that higher concentrations did not occur at higher altitudes.

Higher methane concentrations do actually occur at around 500 hPa, as the images on the right illustrate. Such high peaks are important as they could be caused by abrupt methane releases rising in plumes from the seafloor of the Arctic Ocean.

The N20 satellite image on the right that shows concentrations of up to 2585 ppb at 487.2 mb (equivalent to 487.2 hPa) on January 6, 2022.

Another recent example is the MetOp satellite peak reading on the right of 2854 ppb at 586 mb on January 9, 2022.

An earlier example is a MetOp satellite reading of up to 2861 ppb at 469 mb on December 31, 2021.

Further examples are readings of up to 2852 ppb at 506 mb and up to 3644 ppb at 367 mb on November 21, 2021, pm.

The image below is a screenshot of a Copernicus forecast for January 5, 2022, 03 UTC, this time showing methane at surface level and using a Eurasia projection. Note that the darkest-brown color on the scale for surface level indicates methane concentrations above 2160 parts per billion (ppb).

The image below is a forecast for January 9, 2022, 03 UTC, run January 9, 2022, 00 UTC. The scale for this image goes up to 24840 ppb. That doesn't necessarily mean that concentrations are forecast to be as high as that; Copernicus has simply fixed the top end of the scale for 850 hPa at 24840 ppb.

For its surface forecasts, Copernicus appears to use a combination of models and observations, with an emphasis on extrapolating from in situ measurements, which can ignore methane releases from locations where such in situ measurements are lacking, particularly over the Arctic Ocean. By contrast, the animation below of December 31, 2021 am, polar-orbiting MetOp satellite images, from an earlier post, shows the highest methane concentrations first emerging over water at higher latitudes North, rather than over land.

Clearly, some very high methane concentrations are showing up over the Arctic. The image below shows monthly average in situ methane measurements recorded at Barrow, Alaska, with high averages showing up for recent months.

Furthermore, carbon dioxide levels also continue to be very high at Barrow, Alaska, as illustrated by the image below, showing a recent daily average exceeding 430 ppm.

Locally, CO₂ concentration can be even higher. The image below shows a concentration of 440 ppm over the Arctic Ocean at the green circle, as the jet stream crosses the Arctic on January 19, 2022.

CO₂ concentration at Mauna Loa was 420.52 ppm on January 26, 2022. The annual peak for CO₂ is expected to occur about May 2022, so it will still go up a lot higher than this over the next few months.

Why again is this growth in methane so terrifying?

The danger is that these high concentrations of greenhouse gases over the Arctic will contribute to high temperature anomalies in the Arctic and result in further decline of the snow and ice cover and associated changes to the Jet Stream, causing abrupt methane releases from submarine sediments containing hydrates and chambers of free gas.

The MetOp-B satellite recorded a mean methane level of 1958 ppb on October 25, 2021 am at 295 mb, and when using a 1-year GWP of 200, this translates into 391.6 ppm CO₂e. Together with the above CO₂, that's 391.6 + 420.52 = 812.12 ppm CO₂e.

Now add an additional 5 Gt of methane from an abrupt eruption of the seafloor, which is only 10% of the 50 Gt that Natalia Shakhova et al. warned about long ago, while 50 Gt is in turn only a small fraction of all the methane contained in sediments in the Arctic. On its own, such an eruption of seafloor methane could raise the global mean methane concentration by almost 2000 ppb which, at a 1-year GWP of 200, would translate into 400 ppm CO₂.

So, that would abruptly cause the joint CO₂e of just two greenhouse gases, i.e. methane and CO₂, to cross the 1200 ppm clouds tipping point, triggering a further 8°C global temperature rise, due to the clouds feedback.

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

Links

• NOAA - globally averaged marine surface monthly mean methane data
https://gml.noaa.gov/webdata/ccgg/trends/ch4/ch4_mm_gl.txt

• NOAA - globally averaged marine surface annual mean methane growth rates

https://gml.noaa.gov/webdata/ccgg/trends/ch4/ch4_gr_gl.txt

• Copernicus news release

https://climate.copernicus.eu/sites/default/files/custom-uploads/Annual_summary_2021/C3S-CAMS%20annual%20temp%20data%20and%20CO2%202021_press%20release_final.pdf

• Terrifying Arctic methane levels

https://arctic-news.blogspot.com/2021/12/terrifying-arctic-methane-levels.html

• NOAA - Infrared Atmospheric Sounding Interferometer (IASI) Sounding Products (MetOp)
https://www.ospo.noaa.gov/Products/atmosphere/soundings/iasi

• CAMS, the Copernicus Atmosphere Monitoring Service
https://atmosphere.copernicus.eu/charts/cams

• NOAA - Carbon Cycle Gases, Barrow Atmospheric Baseline Observatory, United States
https://gml.noaa.gov/dv/iadv/graph.php?code=BRW

• NOAA - Trends in Atmospheric Carbon Dioxide, Mauna Loa, Hawaii
https://gml.noaa.gov/ccgg/trends/graph.html

• Human Extinction by 2022?
https://arctic-news.blogspot.com/2021/11/human-extinction-by-2022.html

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

Monday, May 4, 2020

Very High Greenhouse Gas Levels

Carbon Dioxide

On June 1, 2020, NOAA recorded a daily average carbon dioxide (CO₂) level of 418.32 ppm at Mauna Loa, Hawaii.

The image below shows hourly average CO₂ levels approaching 419 ppm at Mauna Loa on May 1, 2020.

The image below shows hourly (red circles) and daily (yellow circles) averaged CO₂ values at Mauna Loa, Hawaii over 31 days, up to May 31, 2020, with some recent hourly averages showing up with values exceeding 419 ppm.

The image below shows hourly (red circles) and daily (yellow circles) averaged CO₂ values at Mauna Loa, Hawaii over 31 days, through June 1, 2020, when a daily average of 418.32 ppm was recorded.

By comparison, the highest daily average CO₂ level recorded by NOAA in 2019 at Mauna Loa was 415.64 ppm, as discussed in an earlier post. The image below shows how CO₂ growth has increased over the decades.

As illustrated by the image below, the daily average CO₂ on June 1, 2019, was 414.14 ppm and the daily average CO₂ on June 1, 2020, was 418.32 ppm, i.e. 4.18 ppm higher. The average in May 2019 was 414.65 ppm and the average in May 2020 was 417.07 ppm, i.e. 2.42 ppm higher. Since the annual maximum is typically reached in May, this high reading for June 1, 2020, could indicate that, while CO₂ emissions by people were suppressed in April and May 2020 due to the COVID-19 lockdowns, growth of CO₂ levels in the atmosphere continues to speed up now as restrictions are relaxed.

Even more significant than the daily averages could be the hourly averages. The daily average CO₂ level recorded by scripps.ucsd.edu at Mauna Loa, Hawaii, was 418.04 ppm on May 25, 2020. On May 24, 2020, one hourly average exceeded 420 ppm, at which time emissions by people had raised CO₂ levels by some 160 ppm compared to the situation thousands of years ago, and by even more if levels had continued to follow a natural trend, as illustrated by the image and inset below.

A rise of 100 ppm CO₂ has historically corresponded with a global temperature rise of some 10°C or 18°F, when looking at CO₂ levels and temperatures over the past 420,000 years, as illustrated by the image below.

Concentrations of carbon dioxide, methane (CH₄) and nitrous oxide (N₂O) in 2018 surged by higher amounts than during the past decade, according to a 2019 WMO news release and as illustrated by the image on the right, from an earlier post, which shows that CH₄, CO₂ and N₂O levels in the atmosphere in 2018 were, respectively, 259%, 147% and 123% of their pre-industrial (before 1750) levels.

So, methane levels have been rising much faster than CO₂ since 1750 and there is much potential for an even faster rise in methane levels due to seafloor hydrate releases.

Furthermore, as industrial activity declines in the wake of COVID-19, loss of aerosol masking alone could trigger a rapid rise, as discussed by Guy McPherson in recent papers here and here.

Given this, the 160 ppm rise in CO₂ could lead to a global temperature rise of 18°C or 32.4°F from 1750, and such a rise could unfold soon, as oceans and ice take up ever less heat and further feedbacks kick in, as also discussed in earlier post such as this one and this one.

Levels for methane and nitrous oxide were very high in May 2020, as further discussed below.

Methane

MetOp-1 recorded peak methane levels of 2917 ppb at 469 mb on the afternoon of May 22, 2020.

MetOp-1 recorded mean methane levels of 1896 ppb at 336 mb on the morning of May 22, 2020.

MetOp-2 recorded peak methane levels of 1918 ppb at 586 mb on the afternoon of May 24, 2020.

Nitrous Oxide

N20 recorded peak nitrous oxide levels of 366 ppb at 840 mb on the morning of May 21, 2020.

N20 recorded somewhat lower peak nitrous oxide levels of 346.9 ppb at 487.2 mb on the afternoon of May 23, 2020, but look at how much of Antarctica is covered by the magenta color, reflecting levels at the top end of the scale.

Rising greenhouse gas levels are damaging the ozone layer

Nitrous oxide is both a potent greenhouse gas and an ozone depleting substance that is thus directly damaging the ozone layer.

Additionally, rising greenhouse gas levels are indirectly damaging the ozone layer in three ways:

Firstly, rising greenhouse gas levels are making water vapor enter the stratosphere. Higher sea surface temperatures along the path of the Gulf Stream fuel hurricanes traveling north along North America's east coast. More heat also translates into more wind; stronger hurricanes are getting stronger over the years.

Rising levels of greenhouse gases strengthen winds and increase water vapor in the atmosphere. Temperatures are rising faster in the Arctic than in the rest of the world, as illustrated by the image below, and this is changing the Jet Stream.

[ click on images to enlarge ]

Jennifer Francis has long pointed out that, as temperatures at the North Pole are rising faster than at the Equator, the Jet Stream is becoming wavier and can get stuck in a 'blocking pattern' for days, increasing the duration and intensity of extreme weather events. This can result in stronger storms moving more water vapor inland over the U.S., as discussed in earlier posts such as this one. Such storms can cause large amounts of water vapor to rise high up in the sky. Water vapor that enters the stratosphere can damage the ozone layer.

Secondly, as plumes above the anvils of severe storms bring water vapor up into the stratosphere, this also contributes to the formation of cirrus clouds that trap a lot of heat that would otherwise be radiated away, from Earth into space.

Thirdly, higher temperatures and stronger winds increase the intensity of droughts. Heatwaves combined with strong winds, dry soil and dry vegetation can make forest fires produce smoke that can enter the stratosphere and stay there for along time.

Recent examples of extreme weather events are described below, i.e. a huge storm and a heatwave in the Arctic.

Super Typhoon Amphan hits India and Bangladesh

Also in May 2020, super typhoon Amphan hit India and Bangladesh, with high waves and heavy rainfall. Waves as high as 14.2 m or 46.6 ft were forecast (at the green circle) for May 20, 2020, 06:00 UTC as Amphan approached Bangladesh.

"Once once-in-a-century, now once-in-a-decade", comments Sam Carana on this and other events.

The sea surface temperature image below shows that, on May 17, 2020, ocean temperatures were as high as 32.9°C or 91.1°F.

The combination image below shows high sea surface temperatures on May 15, 2020, 12:00 UTC, in the left panel.

Anomalies in the Indian Ocean were as high as 3.4°C or 6.0°F, in the Arctic Ocean as high as 1°C or 1.8°F and in the Pacific Ocean as high as 5.1°C or 9.1°F. Anomalies are from daily average during years 1981-2011.

The right panel of the combination image shows how these high ocean temperatures cause circular wind patterns. Wind speed was as high as 255 km/h or 159 mph in the Indian Ocean, at the location of super typhoon Amphan, on May 18, 2020, 06:00 UTC, while instantaneous wind power density was as high as 177.2 kW/m².

The combination image below shows the temporary cooling impact of Amphan.

The bottom panel shows that on May 18, 2020 09:00 UTC, the temperature at a location in India was 42.6°C or 108.6°F, as Amphan was approaching from the South.

The middle panel shows that, two days later, at the same location and at same time of day, the temperature had fallen to 23.4°C or 74°F as Amphan hit the area.

The cooling is only temporary. The top panel shows that a temperature of 47.9°C or 118.1°F is forecast for that location, same time of day, for May 26, 2020.

Siberian Heatwave

A heatwave hit Siberia in May 2020.

Above image shows that temperature anomalies were forecast to be at the high end of the scale over Siberia on May 22, 2020, 06:00 UTC, i.e. 30°C or 54°F higher than 1979-2000. At the same time, cold temperatures are forecast for much of eastern Europe.

What enables such a strong heatwave to develop is that the Jet Stream is getting more wavy as the temperature difference between the North Pole and the Equator is narrowing, causing both hot air to move up into the Arctic (red arrow) and cold air to descend out of the Arctic (blue arrow).

The Siberian heatwave threatens to trigger forest fires that can cause large amounts of black carbon to settle on the snow and ice cover, speeding up its demise. Furthermore, the heatwave threatens rivers to heat up that carry large amounts of water into the Arctic Ocean. Finally, as discussed, more intense forest fires threaten to cause organic carbon compounds to enter the stratosphere.

Extinction mechanism

A recent study by John Marshall et al. found that the Devionian mass extinction event 360 million years ago, that killed much of the Earth's plant and freshwater aquatic life, was caused by a brief breakdown of the ozone layer. John Marshall says: "Current estimates suggest we will reach similar global temperatures to those of 360 million years ago, with the possibility that a similar collapse of the ozone layer could occur again, exposing surface and shallow sea life to deadly radiation. This would move us from the current state of climate change, to a climate emergency."

John refers to the work by James Anderson et al., who warn that CO₂ and CH₄ release from clathrates and permafrost could cause more water to get carried into the stratosphere. John further describes the 'Extinction mechanism': "High summer temperatures over continental areas can increase the transport of water vapour high into the atmosphere. This water vapour carries with it organic carbon compounds that include chlorine, which are produced naturally by a wide variety of plants, algae and fungi. Once these compounds are near the ozone layer, they release the chlorine and this breaks down ozone molecules. This produces a positive feedback loop because a collapsing terrestrial ecosystem will release a flush of nutrients into the oceans, which can cause a rapid increase in algae."