Trends of extreme temperature and precipitation in Ebinur Lake basin in Xinjiang during the period from 1957 to 2012

doi:10.7523/j.issn.2095-6134.2018.02.003

Abstract

Abstract: The linear regression and Mann-Kendall abrupt change test methods are employed to analyze the temporal variability trends of 22 extreme climate indices in Ebinur Lake basin from 1957 to 2012. The results are given as follows. 1) From 1957 to 2012, most of the warm indices showed increase trends while summer days, annual maximum temperature and warm spell duration days non-significantly increased. Most of the cold indices had decrease trends, but daily minimum temperature and monthly minimum value of daily maximum temperature increased by 0.78 and 0.33℃/10 a, respectively. Except that consecutive dry days significantly decreased by 3.63d/10a, the precipitation indices showed increasing trends. 2) The amplitudes of changes in cold spell duration days, monthly minimum value of daily maximum temperature, and annual minimum temperature were larger than those of changes in warm spell duration days, monthly maximum value of daily minimum temperature, and annual maximum temperature,respectively. Changes in night extreme climate indices were greater than changes in daytime extreme climate indices. 3) Among atmospheric circulation patterns,AO had the highest influence on extreme temperature indices, followed by NAO and ENSO. These patterns had the most obvious influence on cold extreme indices, but slight effect on extreme precipitation indices in Ebinur Lake basin. 4) Except annual minimum temperature, the other warm indices showed significant positive correlation with annual mean temperature(AMT). Except monthly minimum value of daily maximum temperature and annual minimum temperature, which had significant positive correlations with AMT, the cold indices as well as diurnal temperature range showed significant negative correlation with AMT. Most of extreme precipitation indices had significant positive relationship with total annual precipitation.

Key words: Ebinur Lake basin, extreme temperature and precipitation, abrupt change test, atmospheric circulation

CLC Number:

P467

DING Zhiyong, GE Yongxiao, ABUDUWAILI Jilili, PU Jia. Trends of extreme temperature and precipitation in Ebinur Lake basin in Xinjiang during the period from 1957 to 2012[J]. , 2018, 35(2): 160-171.

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