Dynamics of Southern Hemisphere Atmospheric Circulation Response to Anthropogenic Aerosol Forcing Academic Article

abstract

• AbstractAnthropogenic aerosols, concentrated largely in the Northern Hemisphere, not only affect the local climate but also induce pronounced changes in atmospheric circulation that extend into the Southern Hemisphere (SH). In coupled historical singleforcing simulations, aerosol forcing induces a deceleration of both the subpolar jet (SPJ) and the subtropical jet (STJ) in SH in austral winter. Atmospheric general circulation model experiments indicate that the STJ is weakened by an interhemisphere gradient in the zonal mean sea surface temperature (SST) and an anomalous crossequatorial Hadley circulation, while the SPJ response shares similar feedbacks with the greenhouse gas forcing. Specifically, atmospheric eddy adjustments are important for the SPJ change. The atmospheric response unique to anthropogenic aerosol forcing (e.g., crossequatorial Hadley cell and the weakened SH STJ) can be exploited for climate change attribution.

authors

• Xu, Yangyang

published proceedings

• GEOPHYSICAL RESEARCH LETTERS

altmetric score

• 1.75

author list (cited authors)

• Wang, H., Xie, S., Zheng, X., Kosaka, Y. u., Xu, Y., & Geng, Y.

citation count

• 9

publication date

• October 2020

publisher

• American Geophysical Union (AGU)  Publisher

published in

• Geophysical Research Letters  Journal

keywords

• Aerosol Forcing
• Interhemispheric Asymmetry
• Southern Hemisphere
• Subpolar Jet
• Subtropical Jet

Digital Object Identifier (DOI)

• 10.1029/2020GL089919

volume

• 47

issue

• 19

URL

• http://dx.doi.org/10.1029/2020gl089919

user-defined tag

• 13 Climate Action