Contrasting recent trends in southern hemisphere westerlies across different ocean basins

Waugh, Darryn W.; Banerjee, Antara; Fyfe, John C.; Polvani, Lorenzo M.

doi:10.1029/2020GL088890

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Contrasting recent trends in southern hemisphere westerlies across different ocean basins

2020
By Waugh, Darryn W. ; Banerjee, Antara ; Fyfe, John C. ; ...
Source: Geophysical Research Letters, 47, e2020GL088890.

[PDF-1.18 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Waugh, Darryn W. ; Banerjee, Antara ; Fyfe, John C. ; Polvani, Lorenzo M.

Waugh, Darryn W. ; Banerjee, Antara ; Fyfe, John C. ; Polvani, Lorenzo M. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CSL (Chemical Sciences Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences)

OAR (Oceanic and Atmospheric Research) ; CSL (Chemical Sciences Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) Less -
Description:

Many studies have documented the trends in the latitudinal position and strength of the midlatitude westerlies in the Southern Hemisphere. However, very little attention has been paid to the longitudinal variations of these trends. Here, we specifically focus on the zonal asymmetries in the southern hemisphere wind trends between 1980 and 2018. Meteorological reanalyses show a large strengthening and a statistically insignificant equatorward shift of peak near‐surface winds over the Pacific, in contrast to a weaker strengthening and significant poleward shift over the Atlantic and Indian Ocean sectors. The reanalysis trends fall within the ensemble spread for historical climate model simulations, showing that climate models are able to capture the observed trends. Climate model simulations indicate that the differential movement of the peak westerlies is a manifestation of internal variability and is not a forced response. Implications of these asymmetries for other components of the climate system are discussed.
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Longitudinal Variation Westerlies
Source:

Geophysical Research Letters, 47, e2020GL088890.
DOI:

https://doi.org/10.1029/2020GL088890
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Journal Article
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Souther Hemisphere
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urn:sha256:ec1b9afdb3b83b888b96864634d80cdf8f6bf49a6df667cdaa8bfa8d8c79cd84
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Contrasting recent trends in southern hemisphere westerlies across different ocean basins

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