2012-2019年乌鲁木齐市夏季降水日变化特征

doi:10.12118/j.issn.1000–6060.2021.05.03

Abstract

Abstract:

Based on summer hourly precipitation data from six meteorological stations in Urumqi City, Xinjiang, China between 2012 and 2019, we analyzed the daily characteristics of hourly precipitation over the last eight years. The results show that: (1) Over the past eight years, the spatial distribution of summer precipitation and days of precipitation in Urumqi generally has declined from mountainous areas to the suburbs. General precipitation highly contributes to the total precipitation. (2) The trend of hourly cumulative precipitation and precipitation frequency in the entire city and each region was remarkable. The rate of increase was significantly higher than the rate of decrease, and the rate of increase in mountainous areas were substantially higher than that in urban areas and suburbs. (3) The peak values of precipitation in the entire city and mountainous areas were appeared from 16:00 to 00:00, from 00:00 to 04:00 in urban areas, and from 02:00 to 07:00 in the suburbs. There were some differences in the peak hours of precipitation frequency, with the heaviest periods of precipitation being night-time. Daily variations in precipitation intensity differed from precipitation and precipitation frequency. The maximum value appeared at 17:00 in mountainous areas, 20:00 in urban areas, and 16:00 in the suburbs. (4) Short-duration precipitation was the main precipitation in the entire city and each region. The frequency of precipitation lasting one hour was the highest, highly contributing to the total frequency of precipitation. Precipitation throughout the city and in mountainous areas lasted for two hours but was the highest. Precipitation lasted three hours in urban areas and six hours in the suburbs that were the highest. Precipitation that lasted for one to six hours represented 60.7% of the total precipitation in the entire city and consisted mainly of night-time and short-term precipitation.

Key words: summer precipitation, diurnal variation, rainfall persistence, Urumqi City

MIAO Yunling,GONG Hengrui,WANG Jian,GE Yicheng,LI Ruqi. Diurnal variation characteristics of summer precipitation in Urumqi Cityfrom 2012 to 2019[J].Arid Land Geography, 2021, 44(5): 1222-1230.

Figures/Tables 13

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区域	站名	纬度/N	经度/E	海拔高度/m
城区	乌鲁木齐	43°47′	87°39′	935.0
城区	米东	43°58′	87°39′	600.3
郊区	达坂城	43°21′	88°19′	1103.5
山区	小渠子	43°29′	87°06′	1871.8
	牧试站	43°27′	87°11′	1930.0
	大西沟	43°06′	86°50′	3539.0

指标	全市	城区	郊区	山区
一般性降水量/mm	300.1	56.7	46.2	197.2
强降水量/mm	86.6	10.0	6.8	69.8
总降水量/mm	386.7	66.7	53.0	267.0
一般性降水日数/d	648.8	144.5	127.0	377.3
强降水日数/d	47.8	6.5	3.0	38.3
总降水日数/d	696.6	151.0	130.0	415.6

时段	全市		城区		郊区		山区
时段	次数/次	比例/%	次数/次	比例/%	次数/次	比例/%	次数/次	比例/%
前半夜	51.7	30.9	23.5	33.3	14.8	24.0	75.5	31.9
后半夜	32.1	19.2	22.9	32.4	23.0	37.2	49.3	20.8
上午	32.4	19.4	10.5	14.9	15.3	24.8	35.0	14.8
下午	51.1	30.5	13.7	19.4	8.8	14.2	76.9	32.5

Diurnal variation characteristics of summer precipitation in Urumqi Cityfrom 2012 to 2019

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