To understand the improvements of two types of background filed used to weather forecasting assimilate radar observation, WRF model and ADAS are used to forecast the rainstorm that occurred at Jinzhou and Fushun of Liaoning during 15-17 August 2013, and two types of background filed include T639 and NCEP. The Result shows: (1) WRF fails to forecast the rainstorm in Jinzhou area. After assimilating radar observation with ADAS, it has been great improved in forecasting the rainstorm at the area of Jinzhou with both background fields. There is little improvement of forecast rainfall at Fushun after assimilation within 12~24 hours, and the performance of T639 is better than NCEP as background fields. (2) The initial filed of specific humidity is improved greatly after assimilating radar observation, and distinctly at 700 and 850 hPa. Meanwhile, the water substances in initial field are updated by assimilation, and the position have good correspondence with the area of rainstorm. (3) A strong and deep moist area is forecasted at the rainfall region in both assimilation tests. A system of strong warm wet wind jet stream from southwest at low level and cold dry at high level cooperation with the high moist region is the main reason leads to the occurrence of prolonged heavy precipitation ultimately, and a wind convergence in front of the moist region and a strong sinking inflow in the back of the rainfall region also forecasted with two background fields.
LI Deqin
,
DUAN Yunxia
,
ZHOU Xiaoshan
,
CUI Jin
,
YANG Yang
,
QIU Xiaobin
,
HAN Fangqiang
. Numerical Forecasting Study of a Rainstorm at Liaoning by Assimilating Radar Data of Two Kinds of Background Fields[J]. Plateau Meteorology, 2015
, 34(4)
: 1107
-1118
.
DOI: 10.7522/j.issn.1000-0534.2014.00115
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