Ziemke Jerry R, Kramarova Natalya A, Frith Stacey M, Huang Liang-Kang, Haffner David P, Wargan Krzysztof, Lamsal Lok N, Labow Gordon J, McPeters Richard D, Bhartia Pawan K
NASA Goddard Space Flight Center Greenbelt MD USA.
Goddard Earth Sciences Technology and Research (GESTAR)/Morgan State University Baltimore MD USA.
Geophys Res Lett. 2022 Aug 16;49(15):e2022GL098712. doi: 10.1029/2022GL098712. Epub 2022 Aug 12.
NASA satellite measurements show that ozone reductions throughout the Northern Hemisphere (NH) free troposphere reported for spring-summer 2020 during the COronaVIrus Disease 2019 pandemic have occurred again in spring-summer 2021. The satellite measurements show that tropospheric column ozone (TCO) (mostly representative of the free troposphere) for 20°N-60°N during spring-summer for both 2020 and 2021 averaged ∼3 Dobson Units (DU) (or ∼7%-8%) below normal. These ozone reductions in 2020 and 2021 were the lowest in the 2005-2021 record. We also include satellite measurements of tropospheric NO that exhibit reductions of ∼10%-20% in the NH in early spring-to-summer 2020 and 2021, suggesting that reduced pollution was the main cause for the low anomalies in NH TCO in 2020 and 2021. Reductions of TCO ∼2 DU (7%) are also measured in the Southern Hemisphere in austral summer but are not associated with reduced NO.
美国国家航空航天局（NASA）的卫星测量显示，2020年春夏期间，在2019冠状病毒病大流行期间整个北半球对流层臭氧减少的情况在2021年春夏再次出现。卫星测量表明，2020年和2021年春夏期间，北纬20°至60°之间的对流层柱状臭氧（TCO）（主要代表自由对流层）平均比正常水平低约3多布森单位（DU）（或约7%-8%）。2020年和2021年的这些臭氧减少量是2005年至2021年记录中的最低值。我们还纳入了对对流层一氧化氮（NO）的卫星测量，结果显示在2020年和2021年的早春至夏季，北半球的NO减少了约10%-20%，这表明污染减少是2020年和2021年北半球对流层柱状臭氧低异常的主要原因。在南半球的南半球夏季也测量到对流层柱状臭氧减少约2 DU（7%），但与一氧化氮减少无关。
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