Document Detail

Slowdown of the Walker circulation driven by tropical Indo-Pacific warming.
MedLine Citation:
PMID:  23151588     Owner:  NLM     Status:  In-Process    
Global mean sea surface temperature (SST) has risen steadily over the past century, but the overall pattern contains extensive and often uncertain spatial variations, with potentially important effects on regional precipitation. Observations suggest a slowdown of the zonal atmospheric overturning circulation above the tropical Pacific Ocean (the Walker circulation) over the twentieth century. Although this change has been attributed to a muted hydrological cycle forced by global warming, the effect of SST warming patterns has not been explored and quantified. Here we perform experiments using an atmospheric model, and find that SST warming patterns are the main cause of the weakened Walker circulation over the past six decades (1950-2009). The SST trend reconstructed from bucket-sampled SST and night-time marine surface air temperature features a reduced zonal gradient in the tropical Indo-Pacific Ocean, a change consistent with subsurface temperature observations. Model experiments with this trend pattern robustly simulate the observed changes, including the Walker circulation slowdown and the eastward shift of atmospheric convection from the Indonesian maritime continent to the central tropical Pacific. Our results cannot establish whether the observed changes are due to natural variability or anthropogenic global warming, but they do show that the observed slowdown in the Walker circulation is presumably driven by oceanic rather than atmospheric processes.
Hiroki Tokinaga; Shang-Ping Xie; Clara Deser; Yu Kosaka; Yuko M Okumura
Related Documents :
23467078 - Long-term physico-chemical stability of diluted trastuzumab.
24779138 - An efficient empirical model for microwave-induced average temperature of liquid cylind...
23383878 - Universal contact for a tonks-girardeau gas at finite temperature.
24214358 - On the use of scans at a constant ratio of b/e for studying decompositions of peptide m...
1666728 - Temperature induced changes in microsomal (na+,k+)-atpase and lipid composition of cand...
14610038 - Influences of thermal acclimation and acute temperature change on the motility of epith...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Nature     Volume:  491     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  439-43     Citation Subset:  IM    
International Pacific Research Center, Department of Meteorology, SOEST, University of Hawaii at Manoa, 1680 East West Road, Honolulu, Hawaii 96822, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Little change in global drought over the past 60 years.
Next Document:  Variation in receipt of radiation therapy after breast-conserving surgery: assessing the impact of p...