Polar Melting: Difference between revisions
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=====Arctic Shifts to Carbon Source – Stunning Reversal After Capturing Carbon for Tens of Thousands of Years===== | |||
[https://scitechdaily.com/arctic-shifts-to-carbon-source-stunning-reversal-after-capturing-carbon-for-tens-of-thousands-of-years/?fbclid=IwAR1Akt6FQsVWEemdpKnJWuuQnm61nDFbvSapAXROSd1W9xspDL6rpuwSj-M SciTechDaily 11/11/19] | |||
A NASA-funded study suggests winter carbon emissions in the Arctic may be adding more carbon into the atmosphere each year than is taken up by Arctic vegetation, marking a stark reversal for a region that has captured and stored carbon for tens of thousands of years. | |||
The study, published October 21, 2019, in Nature Climate Change, warns that winter carbon dioxide loss from the world’s permafrost regions could increase by 41% over the next century if human-caused greenhouse gas emissions continue at their current pace. Carbon emitted from thawing permafrost has not been included in the majority of models used to predict future climates. | |||
=====Large loss of CO2 in winter observed across the northern permafrost region===== | |||
[https://www.nature.com/articles/s41558-019-0592-8 Nature 10/21/210] | |||
We estimate a contemporary loss of 1,662 TgC per year from the permafrost region during the winter season (October–April). This loss is greater than the average growing season carbon uptake for this region estimated from process models (−1,032 TgC per year). Extending model predictions to warmer conditions up to 2100 indicates that winter CO2 emissions will increase 17% under a moderate mitigation scenario—Representative Concentration Pathway 4.5—and 41% under business-as-usual emissions scenario—Representative Concentration Pathway 8.5. Our results provide a baseline for winter CO2 emissions from northern terrestrial regions and indicate that enhanced soil CO2 loss due to winter warming may offset growing season carbon uptake under future climatic conditions. | |||
=====Alaska's Hottest Month on Record: Melting Sea Ice, Wildfires and Unexpected Die-Offs===== | =====Alaska's Hottest Month on Record: Melting Sea Ice, Wildfires and Unexpected Die-Offs===== | ||
[https://insideclimatenews.org/news/07082019/alaska-record-hottest-month-sea-ice-melt-climate-change-permafrost-species-die-off Inside Climate News 8/07/2019] | [https://insideclimatenews.org/news/07082019/alaska-record-hottest-month-sea-ice-melt-climate-change-permafrost-species-die-off Inside Climate News 8/07/2019] | ||
