Australian wildfires cause the largest stratospheric warming since Pinatubo and extends the lifetime of the Antarctic ozone hole.

Australian wildfires cause the largest stratospheric warming since Pinatubo and extends the lifetime of the Antarctic ozone hole.
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DOI:
10.1038/s41598-022-15794-3
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发表时间:
2022-08-25
期刊:
影响因子:
4.6
通讯作者:
Haywood, Jim
Haywood, Jim
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Damany-Pearce, Lilly;Johnson, Ben;Wells, Alice;Osborne, Martin;Allan, James;Belcher, Claire;Jones, Andy;Haywood, Jim

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2020年1月,全球较低平流层平均温度突然上升,达到自20世纪90年代初以来未曾经历过的水平。在极具统计意义的水平上,平流层下部温度异常高的记录持续了4个月。在这里,我们使用卫星和基于地面的遥感观测相结合的方法,得出源于澳大利亚东南部强烈野火的平流层生物质燃烧气溶胶光学厚度的时间序列,并在最新的气候模型中使用这些气溶胶光学厚度。我们表明,澳大利亚南部的野火是平流层下部变暖的原因。我们还研究了辐射驱动对观测到的平流层臭氧扰动的动力学响应,发现春季南极极涡显着增强,表明生物质燃烧气溶胶在2020年观测到的臭氧空洞异常寿命中起着重要作用。
Global mean lower stratosphere temperatures rose abruptly in January 2020 reaching values not experienced since the early 1990s. Anomalously high lower stratospheric temperatures were recorded for 4 months at highly statistically significant levels. Here, we use a combination of satellite and surface-based remote sensing observations to derive a time-series of stratospheric biomass burning aerosol optical depths originating from intense SouthEastern Australian wildfires and use these aerosol optical depths in a state-of-the-art climate model. We show that the S.E. Australian wildfires are the cause of this lower stratospheric warming. We also investigate the radiatively-driven dynamical response to the observed stratospheric ozone perturbation and find a significant strengthening of the springtime Antarctic polar vortex suggesting that biomass burning aerosols play a significant role in the observed anomalous longevity of the ozone hole in 2020.
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