2014—2018年青海省云水资源时空分布特征

doi:10.13866/j.azr.2021.05.07

Abstract

Abstract:

Based on the ERA5-hour reanalysis data (with a horizontal resolution of 0.25°×0.25°), the precipitation, water vapor, hydrocoagulation, and aerial cloud water resources of Qinghai Province were analyzed from 2014 to 2018, using the CCR-MEM and EOF methods. The results showed that the annual precipitation distribution in Qinghai Province was characterized by a greater decline in the southeast and a more limited decline in the northwest, and the spatial distribution was extremely uneven. The water vapor distribution zones were mainly the Qaidam (Qinghai Lake) and Hehuang Valley in the north, the Hoh Xil (Zhiduo) heterotopia distribution zone in the southwest and the Bayan Kera Mountain-Yellow River bend area in the southeast. The distribution characteristics of hydrocoagulants and precipitation were more similar in the southeast than in the northwest, and more in the windward slope of the mountain range.The average precipitation efficiency of water vapor and water condensate was 0.3% and 14%, respectively. The total cloud water resources measured 70.8 billion tons, and were most abundant in the south and southeast of Sanjiangyuan area. The cloud water resources from the southern foot of Qilian Mountain to the extension zone of Xining were the second highest in this area In the decomposition of the EOF method, the main spatial distribution of cloud water resources showed a step-like change in the northeast and southwest. It is urgent to carry out targeted weather modification operations, based on the transport of water vapor and hydrocoagulants and on the distribution characteristics of cloud water resources, combining different regions and different landforms.

Key words: cloud water resources, moisture transport, precipitation efficiency, EOF analysis

ZHANG Yuxin,MA Xueqian,HAN Huibang,ZHANG Pengliang,LIU Na. Analysis of spatial and temporal distribution characteristics of cloud water resources in Qinghai Province from 2014 to 2018[J].Arid Zone Research, 2021, 38(5): 1254-1262.

Figures/Tables 8

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物理量	意义	方法
水汽总量	区域内参与大气水循环过程的所有水汽的收入量	格点柱垂直积分水汽量+水汽输出+凝结
水凝物总量	区域内参与大气水循环过程的所有水凝物的收入量	格点柱垂直积分水凝物量+水凝物输入+凝结
降水总量	T时段内,分析区域的降水总量	T时段内区域雨量的累加
云水资源总量	一定范围,一段时间中水凝物总量中没有降到地面的部分	水凝物初值+水凝物总输入+凝结-降水
水汽更新周期	区域内水汽瞬时总量的平均值和平均降水强度的比值	水汽瞬时总量的平均值/(总降水量/时段）
水凝物更新周期	区域内水凝物瞬时总量和平均降水强度的比值	水凝物瞬时总量的平均值/(总降水量/时段）
水汽凝结效率	一定范围,一段时间中总凝结量占水汽总量的比率	总凝结量/水汽总量
水汽降水效率	一定范围,一段时间中降水总量占水汽总量的比率	降水总量/水汽总量
水凝物降水效率	一定范围,一段时间中降水总量占水凝物总量的比率	降水总量/水凝物总量

Analysis of spatial and temporal distribution characteristics of cloud water resources in Qinghai Province from 2014 to 2018

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