NDLI: Intensi fi ed anticyclonic anomaly over the western North Paci fi c during El Niño decaying summer under a weakened Atlantic thermohaline circulation

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Intensi fi ed anticyclonic anomaly over the western North Paci fi c during El Niño decaying summer under a weakened Atlantic thermohaline circulation

Content Provider	Semantic Scholar
Author	Chen, Wei
Copyright Year	2015
Abstract	It has been well documented that there is an anticyclonic anomaly over the western North Pacific (WNPAC, hereafter) during El Niño decaying summer. This El Niño-WNPAC relationship is greatly useful for the seasonal prediction of summer climate in the WNP and East Asia. In this study, we investigate themodification of the El Niño-WNPAC relationship induced by a weakened Atlantic thermohaline circulation (THC) in a water-hosing experiment. The results suggest that the WNPAC during the El Niño decaying summer, as well as the associated precipitation anomaly over the WNP, is intensified under the weakened THC. On the one hand, this intensification is in response to the increased amplitude and frequency of El Niño events in the water-hosing experiment. On the other hand, this intensification is also because of greater climatological humidity over the western to central North Pacific under the weakened THC. We suggest that the increase of climatological humidity over the western to central North Pacific during summer under the weakened THC is favorable for enhanced interannual variability of precipitation, and therefore favorable for the intensification of the WNPAC during El Niño decaying summer. This study suggests a possible modulation of the El Niño–Southern Oscillation-WNP summer monsoon relationship by the low-frequency fluctuation of Atlantic sea surface temperature. The results offer an explanation for the observedmodification of the multidecadal fluctuation of El Niño-WNPAC relationship by the Atlantic multidecadal oscillation.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://centaur.reading.ac.uk/40527/3/jgrd51884.pdf
Language	English
Access Restriction	Open
Subject Keyword	Anomaly detection Document completion status - Documented Ebstein Anomaly El Nino-Southern Oscillation Exposure to Humidity General circulation model Heart rate variability Modulation Quantum fluctuation monsoon positive regulation of gastric mucosal blood circulation
Content Type	Text
Resource Type	Article

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