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Rapid summer Russian Arctic sea-ice loss enhances the risk of recent Eastern Siberian wildfires.

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Název: Rapid summer Russian Arctic sea-ice loss enhances the risk of recent Eastern Siberian wildfires.
Autoři: Luo, Binhe, Luo, Dehai, Dai, Aiguo, Xiao, Cunde, Simmonds, Ian, Hanna, Edward, Overland, James, Shi, Jiaqi, Chen, Xiaodan, Yao, Yao, Duan, Wansuo, Liu, Yimin, Zhang, Qiang, Xu, Xiyan, Diao, Yina, Jiang, Zhina, Gong, Tingting
Zdroj: Nature Communications; 6/26/2024, Vol. 15 Issue 1, p1-17, 17p
Témata: WILDFIRES, WILDFIRE prevention, CARBON emissions, VAPOR pressure, PRESSURE control, SUMMER
Geografický termín: SIBERIA (Russia)
Abstrakt: In recent decades boreal wildfires have occurred frequently over eastern Siberia, leading to increased emissions of carbon dioxide and pollutants. However, it is unclear what factors have contributed to recent increases in these wildfires. Here, using the data we show that background eastern Siberian Arctic warming (BAW) related to summer Russian Arctic sea-ice decline accounts for ~79% of the increase in summer vapor pressure deficit (VPD) that controls wildfires over eastern Siberia over 2004-2021 with the remaining ~21% related to internal atmospheric variability associated with changes in Siberian blocking events. We further demonstrate that Siberian blocking events are occurring at higher latitudes, are more persistent and have larger zonal scales and slower decay due to smaller meridional potential vorticity gradients caused by stronger BAW under lower sea-ice. These changes lead to more persistent, widespread and intense high-latitude warming and VPD, thus contributing to recent increases in eastern Siberian high-latitude wildfires. Rapid summer Russian Arctic sea-ice decline is responsible for about 80% of the increase in vapor pressure deficit controlling wildfires over eastern Siberia. The rest is controlled by internal atmospheric variability related to changes in Siberian blocking events. [ABSTRACT FROM AUTHOR]
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Abstrakt:In recent decades boreal wildfires have occurred frequently over eastern Siberia, leading to increased emissions of carbon dioxide and pollutants. However, it is unclear what factors have contributed to recent increases in these wildfires. Here, using the data we show that background eastern Siberian Arctic warming (BAW) related to summer Russian Arctic sea-ice decline accounts for ~79% of the increase in summer vapor pressure deficit (VPD) that controls wildfires over eastern Siberia over 2004-2021 with the remaining ~21% related to internal atmospheric variability associated with changes in Siberian blocking events. We further demonstrate that Siberian blocking events are occurring at higher latitudes, are more persistent and have larger zonal scales and slower decay due to smaller meridional potential vorticity gradients caused by stronger BAW under lower sea-ice. These changes lead to more persistent, widespread and intense high-latitude warming and VPD, thus contributing to recent increases in eastern Siberian high-latitude wildfires. Rapid summer Russian Arctic sea-ice decline is responsible for about 80% of the increase in vapor pressure deficit controlling wildfires over eastern Siberia. The rest is controlled by internal atmospheric variability related to changes in Siberian blocking events. [ABSTRACT FROM AUTHOR]
ISSN:20411723
DOI:10.1038/s41467-024-49677-0