Narrowing of the upwelling branch of the Brewer-Dobson circulation and Hadley cell in chemistry-climate model simulations of the 21st century

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Geophysical Research Letters - 2010 - Li - Narrowing of the upwelling branch of the Brewer‐Dobson circulation and Hadley.pdf (542 KB)

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https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2010GL043718

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https://doi.org/10.1029/2010GL043718
 http://hdl.handle.net/11603/26735

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Author/Creator ORCID

https://orcid.org/0000-0002-7928-0775

Date

2010-07-10

Type of Work

journal articles
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Citation of Original Publication

Li, F., R. S. Stolarski, S. Pawson,P. A. Newman, and D. Waugh (2010), Narrowing of the upwellingbranch of the Brewer‐Dobson circulation and Hadley cell inchemistry‐climate model simulations of the 21st century,Geophys.Res. Lett.,37, L13702, doi:10.1029/2010GL043718.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

Changes in the width of the upwelling branch of the Brewer-Dobson circulation and Hadley cell in the 21st Century are investigated using simulations from a coupled chemistry-climate model. In these model simulations the tropical upwelling region narrows in the troposphere and lower stratosphere. The narrowing of the Brewer-Dobson circulation is caused by an equatorward shift of Rossby wave critical latitudes and Eliassen-Palm flux convergence in the subtropical lower stratosphere. In the troposphere, the model projects an expansion of the Hadley cell's poleward boundary, but a narrowing of the Hadley cell's rising branch. Model results suggest that eddy forcing may also play a part in the narrowing of the rising branch of the Hadley cell.