TY - JOUR
T1 - Ozone Anomalies in the Free Troposphere During the COVID-19 Pandemic
AU - Bouarar, Idir
AU - Gaubert, Benjamin
AU - Brasseur, Guy P.
AU - Steinbrecht, Wolfgang
AU - Doumbia, Thierno
AU - Tilmes, Simone
AU - Liu, Yiming
AU - Stavrakou, Trissevgeni
AU - Deroubaix, Adrien
AU - Darras, Sabine
AU - Granier, Claire
AU - Lacey, Forrest
AU - Müller, Jean François
AU - Shi, Xiaoqin
AU - Elguindi, Nellie
AU - Wang, Tao
N1 - Funding Information:
We would like to acknowledge the high-performance computing support from Cheyenne (https://doi.org/10.5065/D6RX99HX) provided by NCAR's Computational and Information Systems Laboratory of the National Center for Atmospheric Research (NCAR), sponsored by the US National Science Foundation (NSF). This material is based upon work supported by the National Center for Atmospheric Research, which is a major facility sponsored by the National Science Foundation under cooperative agreement no. 1852977. We also acknowledge the support of the AQ-WATCH European project, a HORIZON 2020 Research and Innovation Action (GA 870301). The surface emissions adopted in the present study are based on the CAMS-GLOB-ANT dataset that has been developed with the support of the CAMS (Copernicus Atmosphere Monitoring Service), operated by the European Center for Medium-Range Weather Forecasts on behalf of the European Commission as part of the Copernicus Programme. Tao Wang and Yiming Liu acknowledge support by the Hong Kong Research Grants Council (T24-504/17-N and A-PolyU502/16). Trissevgeni Stavrakou acknowledges the support of the ICOVAC and TROVA projects funded by ESA. Open access funding enabled and organized by Projekt DEAL.
Funding Information:
We would like to acknowledge the high‐performance computing support from Cheyenne ( https://doi.org/10.5065/D6RX99HX ) provided by NCAR's Computational and Information Systems Laboratory of the National Center for Atmospheric Research (NCAR), sponsored by the US National Science Foundation (NSF). This material is based upon work supported by the National Center for Atmospheric Research, which is a major facility sponsored by the National Science Foundation under cooperative agreement no. 1852977. We also acknowledge the support of the AQ‐WATCH European project, a HORIZON 2020 Research and Innovation Action (GA 870301). The surface emissions adopted in the present study are based on the CAMS‐GLOB‐ANT dataset that has been developed with the support of the CAMS (Copernicus Atmosphere Monitoring Service), operated by the European Center for Medium‐Range Weather Forecasts on behalf of the European Commission as part of the Copernicus Programme. Tao Wang and Yiming Liu acknowledge support by the Hong Kong Research Grants Council (T24‐504/17‐N and A‐PolyU502/16). Trissevgeni Stavrakou acknowledges the support of the ICOVAC and TROVA projects funded by ESA.
Publisher Copyright:
© 2021. The Authors.
PY - 2021/8/28
Y1 - 2021/8/28
N2 - Using the CAM-chem Model, we simulate the response of chemical species in the free troposphere to scenarios of primary pollutant emission reductions during the COVID-19 pandemic. Zonally averaged ozone in the free troposphere during Northern Hemisphere spring and summer is found to be 5%–15% lower than 19-yr climatological values, in good agreement with observations. About one third of this anomaly is attributed to the reduction scenario of air traffic during the pandemic, another third to the reduction scenario of surface emissions, the remainder to 2020 meteorological conditions, including the exceptional springtime Arctic stratospheric ozone depletion. For the combined emission reductions, the overall COVID-19 reduction in northern hemisphere tropospheric ozone in June is less than 5 ppb below 400 hPa, but reaches 8 ppb at 250 hPa. In the Southern Hemisphere, COVID-19 related ozone reductions by 4%–6% were masked by comparable ozone increases due to other changes in 2020.
AB - Using the CAM-chem Model, we simulate the response of chemical species in the free troposphere to scenarios of primary pollutant emission reductions during the COVID-19 pandemic. Zonally averaged ozone in the free troposphere during Northern Hemisphere spring and summer is found to be 5%–15% lower than 19-yr climatological values, in good agreement with observations. About one third of this anomaly is attributed to the reduction scenario of air traffic during the pandemic, another third to the reduction scenario of surface emissions, the remainder to 2020 meteorological conditions, including the exceptional springtime Arctic stratospheric ozone depletion. For the combined emission reductions, the overall COVID-19 reduction in northern hemisphere tropospheric ozone in June is less than 5 ppb below 400 hPa, but reaches 8 ppb at 250 hPa. In the Southern Hemisphere, COVID-19 related ozone reductions by 4%–6% were masked by comparable ozone increases due to other changes in 2020.
KW - COVID pandemic
KW - free troposphere
KW - ozone
UR - http://www.scopus.com/inward/record.url?scp=85104947053&partnerID=8YFLogxK
U2 - 10.1029/2021GL094204
DO - 10.1029/2021GL094204
M3 - Journal article
AN - SCOPUS:85104947053
SN - 0094-8276
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 16
M1 - e2021GL094204
ER -
