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Characteristics of extreme temperature event and its response to regional warming in Northwest China in past 45 years

机译：中国西北地区近45年极端气温事件特征及其对区域变暖的响应

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摘要

Using the daily maximum and minimum temperature dataset from 128 stations from 1960 to 2004 in Northwest China, daily extreme high temperature (EHT) and extreme low temperature (ELT) thresholds were determined by centesimal method for different stations at first, then yearly EHT and ELT events were counted up in different stations, and the characteristics of their spatio-temporal distribution were diagnosed at last. The study drew following conclusions: 1) The consistent anomaly distribution characteristic was the most important mode of the EHT and ELT events in Northwest China. 2) The spatial distribution of the EHT and ELT events can be divided into five sub-regions, namely, the north of Qinghai and west of Gansu, the north of Xinjiang, the south of Xinjiang, the east of Northwest China and the south of Qinghai. 3) The EHT events showed remarkable increasing trend in all of five sub-regions, but only in the north of Qinghai and west of Gansu area, sudden change phenomenon occurred; the ELT events showed decreasing trend in all of five sub-regions, and sudden change phenomenon occurred in Northwest China except for south of Qinghai. 4) In all of five sub-regions the EHT events showed remarkable 12–14yr period oscillation, and the ELT event showed significant 13–15yr and 7–8yr period oscillation. 5) The EHT and ELT events displayed remarkable positive and negative responses to regional warming of Northwest China respectively.
机译：利用中国西北地区1960年至2004年128个站点的日最高和最低温度数据集，首先通过百分法确定各个站点的日极端高温（EHT）和极端低温（ELT）阈值，然后分别确定年EHT和ELT对不同站点的事件进行计数，并最终诊断出它们的时空分布特征。该研究得出以下结论：1）一致的异常分布特征是西北地区EHT和ELT事件的最重要模式。 2）EHT和ELT事件的空间分布可分为五个子区域，即青海以北和甘肃以西，新疆以北，新疆以南，西北以东和华南以南。青海3）EHT事件在五个分区均呈显着上升趋势，但仅在青海以北和甘肃以西，发生突变现象。 ELT事件在所有五个分区均呈下降趋势，除青海南部外，西北地区均发生突变。 4）在所有五个子区域中，EHT事件均表现出明显的12-14yr周期振荡，而ELT事件则表现出13-13yr和7-8yr周期振荡。 5）EHT和ELT事件分别显示出对西北地区变暖的显着正负响应。

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