Mainland China (MC) precipitation is mainly affected by the monsoon, therefore MC precipitation is few in wintertime (from November to next April). Southern Branch Trough (SBT) is one of the main weather system affected precipitation in MC in wintertime. An objective method was used to identify the SBT activity dataset from NCEP/NCAR reanalysis dataset from 1981 to 2013. Using the SBT dataset and daily precipitation percentage anomaly data of MC, the influence of SBT to MC precipitation was shown. The most significant influence on the precipitation area of SBT is the Qinghai-Xizang Plateau (QXP) and the Yunnan (YN) region, a significant increase in daily precipitation SBT activity days than the ones with no SBT activity. In Northeast China and Xinjiang regions, SBT shows opponent influence with QXP and YN. SBT position of QXP and YN's Top50 strong precipitation days showed that, when SBT's impact region lays in QXP, SBT more located near 80°E, and SBT less activities in the west of 75°E and east of 85°E; when SBT mainly produce heavy rainfall in YN, SBT mainly located in east of 90°E. SBT located at different positions, it emerged different precipitation distribution. SBT located in west of 80°E, precipitation areas are mainly located in western Xizang. SBT Located between 80°E and 90°E, precipitation areas are mainly located in central Tibet, central south Qinghai and northwest YN. SBT located in east of 90°E, precipitation areas are mainly located in the central QXP and eastern YN.
LIN Zhiqiang
. Influence of the Southern Branch Trough on Plateau of Southwestern China Daily Precipitation in Wintertime[J]. Plateau Meteorology, 2016
, 35(6)
: 1456
-1463
.
DOI: 10.7522/j.issn.1000-0534.2015.00091
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