| 1961-2020年西北地区夏季降水趋势变化特征 |
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| 引用本文： | 李勇,梅双丽,周宁芳.1961-2020年西北地区夏季降水趋势变化特征[J].新疆气象,2023,17(6). |
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| 作者姓名： | 李勇 梅双丽 周宁芳 |
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| 作者单位： | 国家气象中心 北京 100081,国家气象中心 北京 100081,国家气象中心 北京 100081 |
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| 基金项目： | 国家自然科学(U2142207)和国家科技支撑计划课题(2015BAC03B07)资助 |
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| 摘 要： | 采用近60年西北地区364站逐日降水观测数据，从降水量和降水日的角度对比研究了西北地区夏季降水趋势时空变化特征。结果表明：平均而言，西北地区夏季降水量占全年总降水量的50-70%。整体上西北地区降水量呈现显著增多的线性趋势，但并非全区一致性增多。降水量增多（减少）的站数约占区域内总站数的57%（43%），降水日数呈现增多（减少）的站数约占总站数的43%（57%）。两者同时增加的站点主要位于南疆盆地、北疆西部及青海中部和北部等地，两者同时减少的站点主要位于甘肃东南部、宁夏、陕西中部偏东等地，而两者反相变化的站点主要位于新疆北疆地区、青海省西南部边缘地区和陕西南部。近60年西北地区极端降水量和降水日数也呈现出线性增加的趋势。西北地区各个区域降水量和降水日数除年际变化外，还存在年代际变化特征，但不同区域变化位相存在一定差异。
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| 关 键 词： | 西北地区 夏季 降水 趋势 变化 |
| 收稿时间： | 2022/6/7 0:00:00 |
| 修稿时间： | 2022/11/7 0:00:00 |
Variation characteristics of summer precipitation in Northwest China from 1961 to 2020 |
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| liyong,and.Variation characteristics of summer precipitation in Northwest China from 1961 to 2020[J].Bimonthly of Xinjiang Meteorology,2023,17(6). |
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| Authors: | liyong and |
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| Institution: | National Meteorological Center,, |
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| Abstract: | Based on the daily precipitation observation data of 364 stations in Northwest China in recent 60 years, the temporal and spatial variation characteristics of summer precipitation trend in Northwest China are compared from the perspective of precipitation and precipitation day. The results show that, on average, the summer precipitation in Northwest China accounts for 50-70% of the total precipitation in the whole year. On the whole, the precipitation in Northwest China shows a linear trend of significant increase, but it is not consistent in the whole region. The number of stations with increased (decreased) precipitation accounts for about 57% (43%) of the total number of stations in the region, and the number of stations with increased (decreased) precipitation days accounts for about 43% (57%) of the total number of stations. The stations increased at the same time are mainly located in southern Xinjiang basin, western Northern Xinjiang, central and Northern Qinghai, while the stations decreased at the same time are mainly located in Southeast Gansu, Ningxia, eastern central Shaanxi and other places, while the stations with reversed changes are mainly located in Northern Xinjiang, the southwestern edge of Qinghai Province, and southern Shaanxi. In recent 60 years, the extreme precipitation and precipitation days in Northwest China also showed a linear increase trend. In addition to the interannual variation, there are also interdecadal variation characteristics of precipitation and precipitation days in various regions of Northwest China, but there are certain differences in the change phases of different regions. |
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| Keywords: | Northwest China summer precipitation trend change |
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