Reconciling opposing Walker circulation trends in observations and model projections View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2019-04-01

AUTHORS

Eui-Seok Chung, Axel Timmermann, Brian J. Soden, Kyung-Ja Ha, Lei Shi, Viju O. John

ABSTRACT

A strengthening of the Pacific Walker circulation (PWC) over recent decades triggered an intense debate on the validity of model-projected weakening of the PWC in response to anthropogenic warming. However, limitations of in situ observations and reanalysis datasets have hindered an unambiguous attribution of PWC changes to either natural or anthropogenic causes. Here, by conducting a comprehensive analysis based on multiple independent observational records, including satellite observations along with a large ensemble of model simulations, we objectively determine the relative contributions of internal variability and anthropogenic warming to the emergence of long-term PWC trends. Our analysis shows that the satellite-observed changes differ considerably from the model ensemble-mean changes, but they also indicate substantially weaker strengthening than implied by the reanalyses. Furthermore, some ensemble members are found to reproduce the observed changes in the tropical Pacific. These findings clearly reveal a dominant role of internal variability on the recent strengthening of the PWC. The Pacific Walker circulation is predicted to weaken, however, observations suggest a current strengthening. Satellite humidity observations show a weaker response than reanalyses; coupled with model simulations, this suggests that internal variability dominates recent strengthening. More... »

PAGES

1-8

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41558-019-0446-4

DOI

http://dx.doi.org/10.1038/s41558-019-0446-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1113160434


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60 schema:description A strengthening of the Pacific Walker circulation (PWC) over recent decades triggered an intense debate on the validity of model-projected weakening of the PWC in response to anthropogenic warming. However, limitations of in situ observations and reanalysis datasets have hindered an unambiguous attribution of PWC changes to either natural or anthropogenic causes. Here, by conducting a comprehensive analysis based on multiple independent observational records, including satellite observations along with a large ensemble of model simulations, we objectively determine the relative contributions of internal variability and anthropogenic warming to the emergence of long-term PWC trends. Our analysis shows that the satellite-observed changes differ considerably from the model ensemble-mean changes, but they also indicate substantially weaker strengthening than implied by the reanalyses. Furthermore, some ensemble members are found to reproduce the observed changes in the tropical Pacific. These findings clearly reveal a dominant role of internal variability on the recent strengthening of the PWC. The Pacific Walker circulation is predicted to weaken, however, observations suggest a current strengthening. Satellite humidity observations show a weaker response than reanalyses; coupled with model simulations, this suggests that internal variability dominates recent strengthening.
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