gchange  > 气候变化与战略
DOI: 10.1175/JCLI-D-17-0906.1
Scopus ID: 2-s2.0-85061806378
Title:
The key role of ozone-depleting substances in weakening the walker circulation in the second half of the twentieth century
Author: Polvani L.M.; Bellomo K.
Source Publication: Journal of Climate
ISSN: 8948755
Indexed By: SCI ; SCI-E ; EI
Publishing Year: 2019
Volume: 32, Issue:5
pages begin: 1411
pages end: 1418
Language: 英语
Scopus Keyword: Atmospheric chemistry ; Atmospheric radiation ; Greenhouse effect ; Greenhouse gases ; Oceanography ; Ozone ; Surface waters ; Antarctic ozone hole ; Chemistry-climate models ; Eastern tropical pacific ; Ozone depleting substances ; Radiative forcings ; Sea Surface Temperature gradients ; Twentieth century ; Walker circulation ; Climate models
English Abstract: It is widely appreciated that ozone-depleting substances (ODS), which have led to the formation of the Antarctic ozone hole, are also powerful greenhouse gases. In this study, we explore the consequence of the surface warming caused by ODSin the second half of the twentieth century over the Indo-Pacific Ocean, using the Whole Atmosphere Chemistry Climate Model (version 4). By contrasting two ensembles of chemistry- climate model integrations (with and without ODS forcing) over the period 1955-2005, we show that the additional greenhouse effect of ODS is crucial to producing a statistically significant weakening of the Walker circulation in our model over that period. When ODS concentrations are held fixed at 1955 levels, the forcing of the other well-mixed greenhouse gases alone leads to a strengthening-rather than weakening-of the Walker circulation because their warming effect is not sufficiently strong. Without increasing ODS, a surface warming delay in the eastern tropical Pacific Ocean leads to an increase in the sea surface temperature gradient between the eastern and western Pacific, with an associated strengthening of the Walker circulation. When increasing ODS are added, the considerably larger total radiative forcing produces a much faster warming in the eastern Pacific, causing the sign of the trend to reverse and the Walker circulation to weaken. Our modeling result suggests that ODS may have been key players in the observed weakening of the Walker circulation over the second half of the twentieth century. © 2019, American Meteorological Society.
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Document Type: 期刊论文
Identifier: http://119.78.100.177/globalchange/handle/2HF3EXSE/117193
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Recommended Citation:
Polvani L.M.,Bellomo K.. The key role of ozone-depleting substances in weakening the walker circulation in the second half of the twentieth century[J]. Journal of Climate,2019-01-01,32(5)
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