Enhanced impact of early‐summer tropical eastern Pacific sea surface temperature on the July–August precipitation over North China after the late 1970s. (15th November 2021)

• Record Type: Journal Article
• Authors: Yang, Liu; Zhao, Junhu; Li, Shuai; Zang, Naihui; Feng, Guolin
• Is Part Of: International journal of climatology. Volume 42:Number 6(2022)
• Page Start: 3463
• Page End: 3476
• Publication Date: 2021-11-15
• Subjects: interannual relationship -- interdecadal enhancement -- North China mid‐summer precipitation -- tropical eastern Pacific; Climatology -- Periodicals; Climat -- Périodiques; Climatologie -- Périodiques; 551.605
• DOI: 10.1002/joc.7427
• Languages: English
• ISSNs: 0899-8418

Abstract

Abstract: This study identified an enhanced interannual relationship between early‐summer (June–July) tropical eastern Pacific (TEP) sea surface temperature (SST) and subsequent mid‐summer (July–August) precipitation in North China (NC) since the late 1970s. For 1951–1972, the relationship between early‐summer TEP SST and mid‐summer NC precipitation were statistically insignificant. In contrast, for 1977–2018, they were positively significant. Since the late 1970s, the early‐summer negative TEP SST anomaly was generally followed by a significant anomalous anticyclone over the Korean Peninsula and its environs; that facilitated anomalous southerly winds over NC, conveying more moisture from the North Pacific, leading more precipitation over NC. Further studies show that the enhanced relationship between early‐summer TEP SST and tropical Indian Ocean to WNP SST are suggested to be responsible for significantly anticyclonic anomalies over WNP after the late 1970s. Abstract : The change in the basic flows, characterized by the northward shift of the EAJS, is responsible for the northward shift of middle latitude structure of PJ teleconnection pattern in the P1, the enhanced relationship between early summer TEP SST and TIO to WNP SST are suggested to be responsible for significant low latitude structure of the PJ teleconnection pattern after the late 1970s. Diagram of pattern change mechanism of NCMSP and early summer TEP SST in P1 (left) P2 (right). Lower layer: shading and red (green) vertical arrow are SST, convection, respectively. Upper level: shading, vector, yellow horizontal arrow, and blue horizontal arrow are geopotential height, wind field, wave activity fluxes, and advection, respectively