Long range transport of South and East Asian anthropogenic aerosols counteracting Arctic warming ...

• Main Authors: Fadnavis, Suvarna, Sonbawne, Sunil M., Laakso, Anton, Ploeger, Felix, Rap, Alexandru, Heinold, Bernd, Sabin, T. P., Müller, Rolf
• Format: Article in Journal/Newspaper
• Language: English
• Published: Forschungzentrum Jülich 2024
• Subjects: 530; Arctic
• Online Access: https://dx.doi.org/10.34734/fzj-2024-04614; https://juser.fz-juelich.de/record/1028433

npj climate and atmospheric science 7(1), 101 (2024). doi:10.1038/s41612-024-00633-1 ... : The large-scale convection during the Asian summer monsoon plays an important role in the rapidtransport of boundary layer aerosols into the Asian summer monsoon anticyclone. Here, using thestate-of-the-art ECHAM6–HAMMOZ aerosol-chemistry-climate model, we show that these aerosolsare further transported to the Arctic along isentropic surfaces by the Brewer-Dobson-Circulation(BDC) during the monsoon season. Our model simulations show that East and South Asiananthropogenic emissions contribute significantly to the aerosol transported to the Arctic, whichcauses a higher negative net aerosol radiative forcing at the surface (dimming) of −0.09 ± 0.02 Wm −2and −0.07 ± 0.02 Wm −2 , respectively. Over the Arctic, the East Asian anthropogenic aerosols thatinclude large amounts of sulfate cause a seasonal mean net radiative forcing at the top of theatmosphere (TOA) of −0.003 ± 0.001Wm −2 and a surface cooling of −0.56 K while the black carbondominated aerosol from South Asia shows a positive TOA forcing of +0.004 ± ...