Evaluative Characteristic of Extreme Minimum Temperatureof Northwest China in Recent 49 Years

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Plateau Meteorology
Plateau Meteorology ›› 2011, Vol. 30 ›› Issue (5) : 1266-1273.

Evaluative Characteristic of Extreme Minimum Temperatureof Northwest China in Recent 49 Years

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Abstract

The low temperature events were analyzed based on the NCEP/NCAR dataand the daily minimum temperature observation data from 135 meteorological stations in the Northwest China during 1961-2009, using the methods of linear regression analysis, Mann-Kendall, running T-test, wavelet analysis, power spectrum and composite analysis. The results show that: (1) The spatial distribution of the extreme minimum temperature in Northwest China presents the distributed tendencies of two high and low interactions. The areas with minimum temperature value are located in northern Xinjiang and Qinghai Plateau. And the threshold value of extreme minimum temperature in these places are below -20 ℃; (2) The frequency of annual extreme minimum temperature has obviously reducing at a rate of 3.7 d·(10 a)-1, majority places remarkably reduced at a rate of 3~5 d·(10 a)-1. There isan abrupt change in 1985, the minimum temperature frequency has the remarkable 3 year periods. (3) The values of extreme minimum temperature are between -49.8to -8.6 ℃, the maximum value appears in Fuyun of Xinjiang. There is a same geographic distribution between minimum temperature intensity and extreme minimum temperature. The intenser the extreme minimum temperature is, the longer the day number of duration is. The phase of frequently occurring of minimum temperature is also the phase of the strongest minimum temperature. The global warming causes the extreme minimum temperature events reducing and intensity weakening. (4) From the circulation characteristic quantity analysis, the extreme minimum temperature in Xinjiang related withzonal circulation, polar vortexcharacteristic quantity and Atlantic-Europe circulation, but the extreme minimum temperature in other places related with subtropical highandQinghai-Xizang Plateau height field. The composited analysis indicated that the polar vorticity center is located the Eastern Hemisphere. The Arctic region is the positive anomalous. The middle latitude is belt-shaped negative anomaly. Xinjiang high ridge is located to the west. The East Asian trough is deep. The northwest arid area is in front of the Xinjiang high ridge. The northwest air current is easy to appear the minimum temperature weather. The positions of Ural mountain minimum trough, Xinjiang high ridge and East Asia big trough from 500 hPa to high-level are stable. The atmosphere is the quasi-barotropic state, Northwest China region is controlled by the Xinjiang high pressure ridge, which is unfavourable to the wide range and duration minimum temperature weather.

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Northwest China / Extreme minimum temp / Climatic change

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. Evaluative Characteristic of Extreme Minimum Temperatureof Northwest China in Recent 49 Years. Plateau Meteorology. 2011, 30(5): 1266-1273

References

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