reference : Southward shift of the northern tropical belt from 1945 to 1980

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reftype Journal Article
Abstract Changes in the position and width of the tropical belt are societally and ecologically relevant, because they are associated with shifts of the subtropical dry zones. The tropical belt has widened since about 1980, but little is known about its earlier variability. Here we analyse historical surface and upper-level observations, three global reanalysis data sets, and a reconstruction of total column ozone, to show that the northern tropical edge retracted from 1945 to 1980, while the northern Hadley cell shifted southwards in both summer and winter. We present chemistry-climate model simulations that reproduce the retraction and southward shift. We find that retraction of the tropical belt was largely due to cooling sea-surface temperatures north of the Equator and warming south of the Equator, most prominently over the Atlantic. Substantial hydroclimatic anomalies such as European droughts of the 1940s and 1950s and the Sahel drought of the 1970s were associated with this shift of the Hadley cell. Our results suggest that multidecadal changes in the position of the northern Hadley cell are an important component of climate variability.
Author Brönnimann, Stefan; Fischer, Andreas M.; Rozanov, Eugene; Poli, Paul; Compo, Gilbert P.; Sardeshmukh, Prashant D.
DOI 10.1038/ngeo2568
Date 12//print
Issue 12
Journal Nature Geoscience
Pages 969-974
Title Southward shift of the northern tropical belt from 1945 to 1980
Volume 8
Year 2015
Bibliographic identifiers
.publisher Nature Publishing Group
.reference_type 0
_record_number 19597
_uuid 7b777d16-940f-48b1-9c2b-0306c2c4666e