Identifying Regional Prolonged Low Temperature Events in China |
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| Authors: | ZHANG Zongjie and QIAN Weihong |
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| Institution: | Monsoon and Environment Research Group, Department of Atmospheric and Oceanic Sciences,School of Physics, Peking University, Beijing 100871,Monsoon and Environment Research Group, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871 |
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| Abstract: | This study examined regional prolonged low temperature (PLT) events
in China from the observational station data for the period 1960--2008 using
the new criteria. The new definition of a site PLT event is that the daily
minimum temperature does not exceed the 10th percentile threshold of the local
daily minimum temperature climatology for at least 5 days at a station. The
regional PLT event is defined as at least five adjacent stations exhibiting
site PLT simultaneously for >5 d. Under the new definition, 552 regional PLT
events were identified, and three indices: duration, extent, and intensity, as
well as a comprehensive index (CI) were used to quantify the event severity. In
addition, geographical patterns and temporal variations of regional PLT events
were investigated using three event categories: strong, moderate, and weak.
Spatially, strong events were mainly located in the north of Xinjiang and along
the Yangtze River to the south of the Yangtze River; moderate events occurred
in Xinjiang and south of the Yangtze River; and weak events occurred south of
the Yellow River. The variation for the annual frequency of regional PLT events
in China in the last 49 years showed a significant decreasing trend with a rate
of -1.99 times per decade, and the significant transition decade was the 1980s. |
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| Keywords: | regional prolonged low temperature extreme event duration index comprehensive index spatiotemporal variation |
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