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Arid Land Geography >

2021 , Vol. 44 >Issue 4: 897 - 905

DOI: https://doi.org/10.12118/j.issn.1000–6060.2021.04.02

Climatology and Hydrology

Characteristics and influencing factors of persistent low temperature events in northeast Qinghai-Tibet Plateau

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  • 1. Qinghai Climate Center, Xining 810001, Qinghai, China
    2. Qinghai Key Laboratory of Disaster Prevention and Mitigation, Xining 810001, Qinghai, China

Received date: 2020-07-15

  Revised date: 2020-12-29

  Online published: 2021-08-02

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Abstract

Based on daily minimum temperature data from 66 observation stations in winter in the northeast region of the Qinghai-Tibet Plateau, China from 1960 to 2020 and the NCEP/NCAR reanalysis product, this paper uses the percentile method to determine persistent low-temperature events, proposes criteria for low-temperature days and regional persistent low-temperature events, and discusses the extreme winter climate index and the relevance of incidents at low-temperature. The results show the following. (1) Regional persistent low-temperature events were primarily concentrated in the eastern agricultural area. (2) The differences between different types of low-temperature event circulations are primarily manifested in the latitudes of the positive and negative anomaly centers of the 500-hPa height field and the southward extension strength of the 700-hPa north wind component. (3) The polar vortex index, plateau region index, Indian-Burma Trough, Arctic Oscillation index, and plateau heating field reach 15% (or 85%) extreme thresholds, and the percentage occurrence of regional extreme low-temperature events exceeds 60%. Therefore, certain signals can be used for diagnosing and predicting the RELTE from index anomalies. In the context of climate warming, the distribution characteristics of persistent extreme low-temperature events in the northeast area of the Qinghai-Tibet Plateau and their correlation with extreme climate indexes were studied to provide references for agricultural and animal husbandry production, meteorological disaster early warning, and the further improvement of the ecological meteorological service guarantee capacity in this region.

Key words： regional persistent low temperature event; circulation anomaly; climate index; northeast of Qinghai-Tibet Plateau

Cite this article

ZHANG Tiaofeng,YANG Zhaoming,WEN Tingting,LAI Xiaoling,MA Youxuan . Characteristics and influencing factors of persistent low temperature events in northeast Qinghai-Tibet Plateau[J]. Arid Land Geography, 2021 , 44(4) : 897 -905 . DOI: 10.12118/j.issn.1000–6060.2021.04.02

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