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Detecting cross‐equatorial wind change as a fingerprint of climate response to anthropogenic aerosol forcing
Author(s) -
Wang Hai,
Xie ShangPing,
Tokinaga Hiroki,
Liu Qinyu,
Kosaka Yu
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl068521
Subject(s) - forcing (mathematics) , aerosol , climatology , environmental science , hadley cell , atmospheric sciences , climate model , climate change , atmospheric circulation , mode (computer interface) , geology , general circulation model , oceanography , meteorology , geography , computer science , operating system
Anthropogenic aerosols are a major driver of the twetieth century climate change. In climate models, the aerosol forcing, larger in the Northern than Southern Hemispheres, induces an interhemispheric Hadley circulation. In support of the model result, we detected a robust change in the zonal mean cross‐equatorial wind over the past 60 years from ship observations and reanalyses, accompanied by physically consistent changes in atmospheric pressure and marine cloud cover. Single‐forcing experiments indicate that the observed change in cross‐equatorial wind is a fingerprint of aerosol forcing. This zonal mean mode follows the evolution of global aerosol forcing that is distinct from regional changes in the Atlantic sector. Atmospheric simulations successfully reproduce this interhemispheric mode, indicating the importance of sea surface temperature mediation in response to anthropogenic aerosol forcing. As societies awaken to reduce aerosol emissions, a phase reversal of this interhemispheric mode is expected in the 21st century.