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Interannual Variability of Springtime Extreme Heat Events over the Southeastern Edge of the Tibetan Plateau: Role of a Spring-Type Circumglobal Teleconnection Pattern.
In: Journal of Climate, Jg. 34 (2021-12-15), Heft 24, S. 9915-9930
Online
academicJournal
Zugriff:
As a result of the high mountains to the west and north of the plateau and the control by westerly mean flow in spring, hot and dry conditions are often observed over the southeastern edge of the Tibetan Plateau (SETP), favoring occurrences of extreme heat events there. Indeed, maximum centers and remarkable increasing trends of extreme heat (EH) days in spring are found over the region. Springtime EH events over the SETP also exhibit strong interannual variability and are closely linked to a spring-type circumglobal teleconnection (SCGT) pattern, which is the second leading mode of 200-hPa meridional wind over the North Hemisphere in spring. This SCGT shows distinctive features from the traditional circumglobal teleconnection patterns found in boreal summer and winter. It manifests as a circumglobally navigated Rossby wave train along the mid–high latitudes, which splits to a north branch along the polar jet and a south branch along the subtropical jet over Eurasia after propagating through the North Atlantic Ocean. The two branches eventually reach the SETP, forming an anomalous anticyclonic circulation over the region. Hence, conditions in the SETP are controlled by significant anomalous subsidence and a clearer sky, resulting in below-normal rainfall and above-normal air temperature, favoring more EH events in the region. The SETP EH events are also closely linked to the spring-type CGT-like pattern in April and May but not in March. In addition, the influence of the foehn effect on the SETP EH is discussed. [ABSTRACT FROM AUTHOR]
Titel: |
Interannual Variability of Springtime Extreme Heat Events over the Southeastern Edge of the Tibetan Plateau: Role of a Spring-Type Circumglobal Teleconnection Pattern.
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Autor/in / Beteiligte Person: | Zhang, Tuantuan ; Jiang, Xingwen ; Chen, Junwen ; Yang, Song ; Deng, Yi ; Wei, Wei ; Hu, Peng ; Gao, Peng |
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Zeitschrift: | Journal of Climate, Jg. 34 (2021-12-15), Heft 24, S. 9915-9930 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 0894-8755 (print) |
DOI: | 10.1175/JCLI-D-21-0049.1 |
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