1961—2017年青藏高原东北部雨季降水量变化及其贡献度分析

doi:10.13866/j.azr.2021.01.03

Abstract

Abstract:

The study on the characteristics of precipitation in the Qinghai-Tibet Plateau under the background of climate warming is of great significance for revealing the impact of climate change on agriculture, animal husbandry, and ecological environment. Based on the daily precipitation data of 53 meteorological observation stations from May to September of 1961-2017, the characteristics of rainy season precipitation in the northeast Qinghai-Tibet Plateau and the relative contribution of changes in precipitation of different grades in precipitation increment were analyzed. The results showed that the rainy season precipitation in the arid region in the northeast of the Qinghai-Tibet Plateau increased and that in the semi-arid and semi-humid regions became extreme from 1961 to 2017. Precipitation intensity has generally increased in most areas. Further analysis showed that the change in rainy season precipitation in the northeast of the Qinghai-Tibet Plateau is caused by the change in precipitation intensity, and the increase in contribution of moderate rainfall grade precipitation is greater than that of other grade precipitation. The trend of precipitation extremization in the east of the semi-humid and semi-arid regions was obviously enhanced. The results are helpful in understanding the climatic effect of change in ecological environment on the northeast of Qinghai-Tibet Plateau.

Key words: Northeast Qinghai-Tibet Plateau, classified precipitation, precipitation, contribution

YANG Zhaoming,ZHANG Tiaofeng. Analysis of precipitation change and its contribution in the rainy season in the northeast Qinghai-Tibet Plateau from 1961 to 2017[J].Arid Zone Research, 2021, 38(1): 22-28.

Figures/Tables 8

Fig. 1

Fig. 2

Tab. 1

Tab. 2

The six catalogs of the trends in the rainfall amount, days and intensity of precipitation in rainy season in the study area"

变化趋势	站点数	百分比/%
$T P ↑ T d ↑ T i ↓$	1	1.89
$T P ↑ T d ↑ T i ↑$	20	37.74
$T P ↑ T d ↓ T i ↑$	19	35.85
$T P ↓ T d ↑ T i ↓$	1	1.89
$T P ↓ T d ↓ T i ↑$	3	5.66
$T P ↓ T d ↓ T i ↓$	9	16.98

Tab. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

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	降水总量	降水日数	降水强度
干旱区	2.92^*	0.67	0.04
半干旱区	4.54	-0.69	0.11^**
半湿润区	-1.69	-1.87^**	0.07^*

Analysis of precipitation change and its contribution in the rainy season in the northeast Qinghai-Tibet Plateau from 1961 to 2017

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