Unexpected Repartitioning of Stratospheric Inorganic Chlorine After the 2020 Australian Wildfires
Unexpected Repartitioning of Stratospheric Inorganic Chlorine After the 2020 Australian Wildfires
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DOI：
10.1029/2022gl098290
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发表时间：
2022-07
影响因子：
5.2
通讯作者：
S. Strahan;D. Smale;S. Solomon;G. Taha;M. Damon;S. Steenrod;N. Jones;B. Liley;R. Querel;John Robinson
中科院分区：
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作者：
S. Strahan;D. Smale;S. Solomon;G. Taha;M. Damon;S. Steenrod;N. Jones;B. Liley;R. Querel;John Robinson
无机氯(Cly)和奇氮(NOY)化学族影响平流层臭氧。2020年1月，澳大利亚的野火向南部平流层注入了创纪录的烟雾。在1-2个月内，地面和卫星观测显示，Cly和Noy重新分配。到5月份，平流层下部的HCl柱减少了30%，而ClONO2柱增加了40%-50%。Cly扰动在秋分附近开始和结束，向极地增加，并在冬至达到峰值。NO2从2月到4月下降，与硫酸盐气溶胶反应一致，但到6月-Cly恢复之前的几个月恢复到典型值。输运示踪表明，4月份以后观察到的臭氧减少主要是动力作用而不是化学作用，早期没有明显的输运作用。假设野火烟雾的行为与硫酸盐气溶胶相同的模拟无法再现观测到的Cly变化，这表明它们的组成和化学成分不同。这削弱了我们在气候变化中预测臭氧的能力。
The inorganic chlorine (Cly) and odd nitrogen (NOy) chemical families influence stratospheric O3. In January 2020 Australian wildfires injected record‐breaking amounts of smoke into the southern stratosphere. Within 1–2 months ground‐based and satellite observations showed Cly and NOy were repartitioned. By May, lower stratospheric HCl columns declined by ∼30% and ClONO2 columns increased by 40%–50%. The Cly perturbations began and ended near the equinoxes, increased poleward, and peaked at the winter solstice. NO2 decreased from February to April, consistent with sulfate aerosol reactions, but returned to typical values by June ‐ months before the Cly recovery. Transport tracers show that dynamics not chemistry explains most of the observed O3 decrease after April, with no significant transport earlier. Simulations assuming wildfire smoke behaves identically to sulfate aerosols couldn't reproduce observed Cly changes, suggesting they have different composition and chemistry. This undermines our ability to predict ozone in a changing climate.