%0 Journal Article %A JIAO Min %A LI Ji %A WANG Yang %A WANG Ying %A HUANG Yan %T Large-scale Circulation Characteristics of Anomalous Less Rainfall in Liaoning Province in Midsummer of 2014 %D 2018 %R 10.11755/j.issn.1006-7639(2018)-05-0751 %J Journal of Arid Meteorology %P 751-757 %V 36 %N 5 %X

Based on the daily precipitation at 53 stations in Liaoning Province, monthly circulation indexes from National Climate Centre of China and daily reanalysis data from NCEP/NCAR, the large-scale circulation characteristics of anomalous less rainfall in Liaoning Province in midsummer of 2014 were analyzed. The results show that the rainfall  in midsummer of 2014 was seriously less than the climatology mean in Liaoning Province, the precipitation anomaly in most days (87.1%) was negative, and the precipitation in most parts was 50% less than the normal, which was the most serious less rainfall event in the same period in the historically. The configuration of large-scale circulation in upper and lower levels wasn’t extremely beneficial to rainfall in Liaoning Province in midsummer of 2014. Liaoning Province was located in the north of the upper-level jet stream axis, which wasn’t conducive to the development of upward movement. The location of the west Pacific subtropical high and East Asian subtropical frontal zone were to the  west and the south compared with the normal, which caused the lack of warm and wet airflow transportation, so cold and warm air didn’t meet in Liaoning Province. The location of lower level jet stream was more eastward and southward than the normal, the westerly airflow controlled Liaoning Province, where warm and wet airflow transportation and convergence as well as ascending motion lacked. Abnormal sinking motion provided direct driving power for the serious less rainfall in Liaoning Province in midsummer of 2014. The lower level divergence and upper level convergence resulted in the abnormal sinking movement over Liaoning region. Meanwhile, there were two symmetrical abnormal circulations in the north and south sides of Liaoning respectively, which strengthened the sinking movement over Liaoning.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2018)-05-0751