Fig. 5: Influence of NH3 on the regional AOD and CCN in the EMAC model.
From: The impact of ammonia on particle formation in the Asian Tropopause Aerosol Layer
Variations in CCN at 0.2% supersaturation (CCN0.2%) and aerosol optical depth (AOD) are shown for NH3 emissions vs. zero NH3 emissions scenarios. Absolute change in CCN0.2% (cm−3) at cloud-forming level between the different NH3 emissions scenarios during the (a) South Asian monsoon (MJJA) and (b) post-monsoon (SOND) seasons. The grey arrows indicate the wind direction. Percentage change in CCN0.2% between the scenarios with and without NH3 at cloud-forming level for the (c) monsoon (MJJA) and (d) post-monsoon (SOND) seasons. All concentrations are calculated at ambient temperature and pressure. Simulated spatial distribution of (e) absolute and (f) percentage changes in total column AOD at 550 nm when comparing the 2017 NH3 emissions to a zero NH3 emissions scenario during the monsoon season.
