edu.ucar.opensky::articles:24156 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T06:34:50.006796 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d71c217j https://doi.org/10.5281/zenodo.3952959 https Related Dataset #1 Daily aerosol emissions changes in 2020 due to Covid19: modified SSP2-4.5 to account for sector activity level https://doi.org/10.5281/zenodo.4282766 https Related Dataset #2 COVID Emissions Nudged Simulations Climate impacts of COVID-19 induced emission changes 2021-02-16T00:00:00Z publication https://n2t.org/ark:/85065/d71c217j https://doi.org/10.1029/2020GL091805 Gettelman, Andrew author Lamboll, R. author Bardeen, Charles author Forster, P. M. author Watson-Parris, D. author UCAR/NCAR - Library publisher The COVID-19 pandemic led to dramatic changes in economic activity in 2020. We use estimates of emission changes for 2020 in two Earth System Models (ESMs) to simulate the impacts of the COVID-19 economic changes. Ensembles of nudged simulations are used to separate small signals from meteorological variability. Reductions in aerosol and precursor emissions, chiefly black carbon and sulfate (SO4), led to reductions in total anthropogenic aerosol cooling through aerosol-cloud interactions. The average overall Effective Radiative Forcing (ERF) peaks at +0.29 +/- 0.15 Wm(-2) in spring 2020. Changes in cloud properties are smaller than observed changes during 2020. Impacts of these changes on regional land surface temperature range up to +0.3 K. The peak impact of these aerosol changes on global surface temperature is very small (+0.03 K). However, the aerosol changes are the largest contribution to radiative forcing and temperature changes as a result of COVID-19 affected emissions, larger than ozone, CO2 and contrail effects. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation