Based on three sources(automatic weather station observation, retrieve precipitation of satellite and weather radar) precipitation fusion data, the ERA5 reanalysis data from European Centre for Medium-range Weather Forecasts(ECMWF), the diurnal variation of warm season precipitation and its probable cause over Qinling and surrounding areashas been revealed.Results show that diurnal variations of precipitation on both sides of Qinling in the warm season were significantly different, affected by the topography, diurnal peaks of precipitation amount and precipitation frequency in the southern Qinling occurs at night and the north occurs at afternoon.The spatial distribution of long and short duration precipitation is significantly affected by the large terrain, the frequency of short-term precipitation in the southern Qinling is very high, but the precipitation intensity is relatively small, while the frequency of short-term precipitation in the northern Qinling is low but the intensity is very large.Mountain winds and the southwest warm and humid updraft air of terrain trough affected by the Tibetan Plateau over played is an important reason for the frequent occurrence of night rains in the southern Qinling.Affected by the valley wind circulations during the day, the updraft airweakened in the front of the terrain trough, itmakes the daytime precipitation less.The local heating of Loess Plateau, updraft and downdraft air intersection around 700 hPa, which causes the heavy rainfall more frequent in the northern Qinling in the afternoon.
Hongfang ZHANG
,
Liujie PAN
,
Haoming CHEN
,
Lu HAO
,
Xi ZHANG
. Diurnal Variations and Causes of Warm Season Precipitation in Qinling and Surrounding Areas[J]. Plateau Meteorology, 2020
, 39(5)
: 935
-946
.
DOI: 10.7522/j.issn.1000-0534.2019.00067
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