The present study investigates the persistence of summer sea surface temperature anomalies（SSTAs） in the midlatitude North Pacific and its interdecadal variability. Summer SSTAs can persist for a long time（approxim...The present study investigates the persistence of summer sea surface temperature anomalies（SSTAs） in the midlatitude North Pacific and its interdecadal variability. Summer SSTAs can persist for a long time（approximately 8–14 months）around the Kuroshio Extension（KE） region. This long persistence may be strongly related to atmospheric forcing because the mixed layer is too shallow in the summer to be influenced by the anomalies at depths in the ocean. Changes in atmospheric circulation, latent heat flux, and longwave radiation flux all contribute to the long persistence of summer SSTAs. Among these factors, the longwave radiation flux has a dominant influence. The effects of sensible heat flux and shortwave radiation flux anomalies are not significant. The persistence of summer SSTAs displays pronounced interdecadal variability around the KE region, and the variability is very weak during 1950–82 but becomes stronger during 1983–2016. The changes in atmospheric circulation, latent heat flux, and longwave radiation flux are also responsible for this interdecadal variability because their forcings on the summer SSTAs are sustained for much longer after 1982.展开更多
基金supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 41375094 and 41406028)the Basic Scientific Research Fund for National Public Institutes of China (Grant No. GY0215P04)+2 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA11010102)the NSFC–Shandong Joint Fund for Marine Science Research Centers (Grant No. U1406401)the Foundation for Innovative Research Groups of the NSFC (Grant No. 41421005)
文摘The present study investigates the persistence of summer sea surface temperature anomalies（SSTAs） in the midlatitude North Pacific and its interdecadal variability. Summer SSTAs can persist for a long time（approximately 8–14 months）around the Kuroshio Extension（KE） region. This long persistence may be strongly related to atmospheric forcing because the mixed layer is too shallow in the summer to be influenced by the anomalies at depths in the ocean. Changes in atmospheric circulation, latent heat flux, and longwave radiation flux all contribute to the long persistence of summer SSTAs. Among these factors, the longwave radiation flux has a dominant influence. The effects of sensible heat flux and shortwave radiation flux anomalies are not significant. The persistence of summer SSTAs displays pronounced interdecadal variability around the KE region, and the variability is very weak during 1950–82 but becomes stronger during 1983–2016. The changes in atmospheric circulation, latent heat flux, and longwave radiation flux are also responsible for this interdecadal variability because their forcings on the summer SSTAs are sustained for much longer after 1982.
