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Extreme high temperature events in the Northwest Pacific under global warming

Zhiwei Chen^a,*, Jiancheng Kang^b, Guodong Wang^c

 
ABSTRACT:     Variation characteristics of the extreme high temperature events and their relationship with El Ni?oSouthern Oscillation (ENSO) in the Northwest Pacific were analyzed, utilizing the National Oceanic and Atmospheric Administration (NOAA) Daily Sea Surface Temperature (SST) Analysis Data during 1982?2014. The results indicated that extreme high temperature events mainly occurred during the months of June to October, and the frequency of such events was increasing, i.e. the number of days of extreme high temperature events and the duration of single extreme high temperature events increased gradually. The extreme high temperature events showed high and low frequency oscillations in the 1?4a and 4?7a cycles, and the main cycle scale was 3?5a. The SST of the Northwest Pacific was linearly related to the intensity of ENSO. In the second half of the year (June to December), the ENSO index of the Nino3.4 areas was significantly and negatively correlated to the extreme high temperatures. This meaned that the extreme high temperature events were likely to occur when the Pacific equatorial cold phase (La Ni?a event) occurred in the ENSO Cycle. The trade wind anomaly over the equatorial Pacific Ocean and the massive air-sea interactions in the ENSO Cycle had an important impact on the extreme high temperature events in the Northwest Pacific. It is hoped that the results obtained from this work will lay the foundation for monitoring and forecasting extreme weather and climate events.

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* Corresponding author, E-mail: 546335462@qq.com

Received 5 Jan 2021, Accepted 31 Mar 2021