Divergent features of the upper-tropospheric carbonaceous aerosol layer: effects of atmospheric dynamics and pollution emissions in Asia, South America, and Africa

• DOI: 10.1088/1748-9326/ad2eef
• Publication Date: 2024-02-29T22:47:37Z
• Authors: Dongyou Wu; Shirui Yan; Jinxia Zhang; Yang Chen; Yuxuan Xing; Jiecan Cui; Xin Wang; Jun Liu; Wei Pu
• Keywords: Atmospheric Dynamics; Atmospheric pollution

Abstract The upper-tropospheric carbonaceous aerosol layer (TCAL) represents the increase of aerosols in upper-troposphere. It was first discovered over Asia but found this study to also occur South America and Africa. TCALs three regions typically exist during strong deep convection season, with Asian, American, African showing peak intensity July–August, October–December, November–December, respectively. Over Asia, TCAL has highest altitude widest spread due strongest upper-troposphere anticyclonic system. is maybe heaviest pollutant emissions. Anthropogenic pollution from India western China produces two Asian centers, whereas widespread wildfires result single centers radiative effect at top atmosphere warming effects (+0.23 W m −2 ), cooling perform (−0.54 ) Africa (−0.20 owing its divergent strengths black-carbon absorption organic-carbon scattering.