Subjects: Geosciences >> Atmospheric Sciences submitted time 2023-05-30 Cooperative journals: 《干旱区研究》
Abstract： Further exploration of trends in climate warming and humidification in Northwest China can deepen our understanding of important scientific issues regarding the responses to global warming of arid and semi-arid regions of the Northern Hemisphere in mid- and high latitudes. Using statistical methods such as linear trend, Kriging interpolation, and non- parametric Mann- Kendall test for temperature and precipitation data from 127 stations in Northwest China from 1961 to 2021, we show the following: (1) In the last 60 years, Northwest China as a whole has undergone significant warming and humidification. The regional warming trend was relatively consistent [0.32 ℃·(10a)-1], while there was a clear regional imbalance of humidification, with the humidification in the west of Northwest China increasing earlier, more steadily, and more significantly than in the east.
(Increases in the west were mainly distributed in Northwest Xinjiang, while those in the east were mainly in the Qinghai region). (2) There were pronounced interdecadal fluctuations of warming and humidification, and paradigm shifts in temperature and precipitation trends of Northwest China occurred in 1993 and 2010, respectively, after which the rates of warming and humidification were 0.08 ℃·(10a)- 1 and 37.60 mm·(10a)- 1 higher than beforehand. Warming and humidification were more prominent after these paradigm shifts, with the
eastward expansion of warming and humidification being the main feature. (3) The seasonal imbalance of
warming and humidification also showed that the warming was most significant in winter in western Northwest
China, followed by that in summer; winter precipitation increased significantly in western Northwest China,
while spring and summer precipitation increased significantly in eastern Northwest China. These results can
provide a theoretical basis for formulating climate change countermeasures in Northwest China.
Subjects: Geosciences >> Geochemistry submitted time 2019-11-14 Cooperative journals: 《干旱区研究》
Abstract： 利用1960—2016年秦岭南北地区47个站点的逐日降水数据与同期西太平洋副热带高压的面积指数、强度指数、西伸脊点、脊线位置数据，统计分析了秦岭南北地区夏季极端降水指数与副高指数的相关关系。结果表明：①从整体上看，各极端降水指数与面积指数、强度指数总体成正相关；与西伸脊点总体上成负相关，但会出现一些异常年份和负相关年份；而各极端降水指数与脊线位置的关系呈现正负相关交替的现象。年代际分析和M-K检验表明，副高指数、极端降水指数在20世纪80年代发生了增强、增大的突变。②把秦岭南北划分为4个区域后，无论时间上还是空间上，当面积指数、强度指数偏大，脊线位置偏南，西伸脊点偏西，秦岭以北、秦岭以南和汉水流域中部趋于干旱，汉水流域东西部和巴巫谷地极端降水偏多；反之，相反。这样的极端降水格局应是秦岭等山脉对副高在气候上的响应结果。③秦岭南北地区夏季极端降水偏多年与面积指数偏大、强度指数偏强、脊线位置偏南、西伸脊点偏西相联系，反之，相反。副高西伸可能是秦岭南北地区极端降水增大的重要原因之一。
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