Analysis of Record-High Temperature over Southeast Coastal China in Winter 2018/19 : The Combined Effect of Mid- to High-Latitude Circulation Systems and SST Forcing over the North Atlantic and Tropical Western Pacific

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Xiaoxia Lin
  • Maoqiu Jian
  • Marco Y. T. Leung

Detail(s)

Original languageEnglish
Pages (from-to)8813-8831
Number of pages19
Journal / PublicationJournal of Climate
Volume33
Issue number20
Online published14 Sep 2020
Publication statusPublished - 15 Oct 2020

Abstract

In winter 2018/19, southeastern coastal China experienced extreme warm temperatures that were due to a weak East Asian winter monsoon. On the basis of observations from 10 meteorological stations and reanalysis data, the large-scale circulation patterns associated with this extreme warm winter and the possible driving mechanism of its related sea surface temperature (SST) anomalies are investigated in this study. During this winter, many places in this region reached their highest winter mean temperature record and had more extreme warm days and fewer extreme cold days relative to climatology. According to the circulation patterns during winter 2018/19, several large-scale circulation conditions associated mainly with the weak East Asian winter monsoon are identified: the eastward shift of the Siberian high and a shallower East Asian trough, which is related to the low blocking frequency over the Aleutian region, are both unfavorable for cold-air intrusion southward. Meanwhile, strong low-level southerly wind anomalies over southeastern China are related mainly to the 2018/19 El Niño event. Furthermore, the possible role of SST anomalies over the North Atlantic and tropical western Pacific Oceans is examined by using an atmospheric general circulation model, suggesting that both the “tripole pattern” of North Atlantic SST and tropical western Pacific SST anomalies in winter 2018/19 played a role in influencing the East Asian trough. The combined effect of all of these factors seems to be responsible for this extreme warm winter over southeastern coastal China.

Research Area(s)

  • Atmospheric circulation, Cold air surges, Climate variability

Citation Format(s)

Analysis of Record-High Temperature over Southeast Coastal China in Winter 2018/19 : The Combined Effect of Mid- to High-Latitude Circulation Systems and SST Forcing over the North Atlantic and Tropical Western Pacific. / Jian, Yuntao; Lin, Xiaoxia; Zhou, Wen; Jian, Maoqiu; Leung, Marco Y. T.; Cheung, Paxson K. Y.

In: Journal of Climate, Vol. 33, No. 20, 15.10.2020, p. 8813-8831.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal