Detection of spatio-temporal variability of air temperature and precipitation based on long-term meteorological station observations over Tianshan Mountains, Central Asia
Detection of spatio-temporal variability of air temperature and precipitation based on long-term meteorological station observations over Tianshan Mountains, Central Asia
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基于中亚天山地区气象站长期观测的气温和降水时空变化检测
DOI：
10.1016/j.atmosres.2017.12.007
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发表时间：
2018
影响因子：
5.5
通讯作者：
Yuan Xu
中科院分区：
文献类型：
--
作者：
Xu Min;Kang Shichang;Wu Hao;Yuan Xu
天山地区冰川雪量丰富，极易受到气候变化的影响。利用1960-2016年天山山区气象站资料，采用非参数方法，分析了天山山区不同海拔高度、不同分区的气温和降水变化特征。用Mann-Kendall突变检验方法研究了各分区的气候突变。小波分析采用卡方检验和检测的周期性检查。显着的时间段。结果表明，天山地区总体上经历了快速增暖增湿过程，平均增暖速率为0.32 °C/10a，增湿速率为5.82 mm/10a。不同地区气温的年、季空间变化具有不同的尺度。20个站年降水量呈不显著上升趋势，6个站年降水量呈显著上升趋势。东天山地区气温上升最快，平均速率为0.41 °C/10a。年降水量增加幅度最大的是博尔塔拉河谷（8.07 mm/10a）和东天山（2.64 mm/10a）。lowest.in增温最大和最小值分别为500 m以下（0.42 °C/10 a）和海拔1000-1500 m（0.23 °C/10 a）。年降水量增加幅度以海拔1500 ~ 2000 m最大（9.22 mm/10 a），海拔500 m以下最小。(3.45 mm/10a）。年气温和年降水量的突变分别发生在1995年和1990年。大的大气环流影响了气候的突变。气温的显著周期为2.4-4.1年，年降水量的显著周期为2.5-7.4年。天山山区气温趋势值的海拔依赖性不明显。夏、秋季年降水增湿趋势随海拔升高而增大。夏季降水量呈明显的上升趋势，且有较强的海拔依赖性。
As abundant distribution of glaciers and snow, the Tianshan Mountains are highly vulnerable to changes in.climate. Based on meteorological station records during 1960–2016, we detected the variations of air temperature.and precipitation by using non-parametric method in the different sub-regions and different elevations.of the Tianshan Mountains. The mutations of climate were investigated by Mann-Kendall abrupt change test in.the sub-regions. The periodicity is examined by wavelet analysis employing a chi-square test and detecting.significant time sections. The results show that the Tianshan Mountains experienced an overall rapid warming.and wetting during study period, with average warming rate of 0.32 °C/10a and wet rate of 5.82 mm/10a,.respectively. The annual and seasonal spatial variation of temperature showed different scales in different regions..The annual precipitation showed non-significant upward trend in 20 stations, and 6 stations showed a.significant upward trend. The temperatures in the East Tianshan increased most rapidly at rates of 0.41 °C/10a..The increasing magnitudes of annual precipitation were highest in the Boertala Vally (8.07 mm/10a) and lowest.in the East Tianshan (2.64 mm/10a). The greatest and weakest warming was below 500 m (0.42 °C/10a) and.elevation of 1000–1500 m (0.23 °C/10a), respectively. The increasing magnitudes of annual precipitation were.highest in the elevation of 1500 m–2000 m (9.22 mm/10a) and lowest in the elevation of below 500 m.(3.45 mm/10a). The mutations of annual air temperature and precipitation occurred in 1995 and 1990, respectively..The large atmospheric circulation influenced on the mutations of climate. The significant periods of.air temperature were 2.4–4.1 years, and annual precipitation was 2.5–7.4 years. Elevation dependency of.temperature trend magnitude was not evidently in the Tianshan Mountains. The annual precipitation wetting.trend was amplified with elevation in summer and autumn. The strong elevation dependence of precipitation.increasing trend appeared in summer.