A01: Aerosol effective radiative forcing in E3SM

Owned by Yunpeng Shan, created
Last updated: Jun 25, 2023
1 min read

Full Title

Aerosol radiative forcing in E3SM: improvements from aerosol wet removal treatment and parameter tuning

First Author

All Authors

Yunpeng Shan, Jiwen Fan, E3SMv3 atmosphere development team

Topic

Atmosphere

Project

E3SM

Abstract

Anthropogenic aerosol effective radiative forcing (ERFaer) is an important metric to quantify aerosol effects on climate in Earth system models. Department of Energy’s Energy Exascale Earth System Model (E3SM) tends to overestimate ERFaer, direct forcing (ERFari), and indirect forcing (ERFaci), and one important reason is the significantly overestimated aerosol burden and lifetime. The insufficient aerosol wet removal is attributed to the aerosol overestimation. We improved the aerosol wet removal treatments in E3SM and tuned the hygroscopicity of black carbon, leading aerosol burdens well sit within the reference value ranges. Consequently, the ERFari significantly decreases to reasonable values and ERFaci also decreases. Tuning of cloud sensitivity to aerosols and imposing cloud droplet number can further decrease ERFaci. As a result, the total aerosol forcing and its components have been well within the reference ranges.

In-person

Yes

Poster

 

Discussion Link

Yunpeng.Shan@pnnl.gov