In this paper,the multiyear feature and their monthly,seasonal,yearly and interdecadal changes for the air column precipitable water(hereafter PW) over Longitudinal Range-Gorge Region and its surroundings have been analyzed,utilizing the NCEP’s monthly mean specific humidity,wind velocity and potential height reanalyzed grid data and the observed rainfall data.The results show that there exist the considerably monthly,seasonal,yearly and interdecadal changes of the air column PW over the LRGR.It is wetter in the south than that in the north.There are maximum PW in summer and the minimum PW in winter.The air column PW over Yunnan presents approximately a southeast-northwestern U-shaped pattern.The monthly variations of PW show the"corridor-barrier"effect of LRGR.Summer PW shows distinct changes over 25°N, 98.5°E and 106°E.The variation of the summer and winter PW in LRGR is characteristic by both interannual and interdecadal scale.Summer PW underwent a catastrophe in the early 1970s; winter PW underwent a catastrophe in the mid 1950s, the late 1960s and the early 1980s.
WAN Yun-xia, ZHANG Wan-cheng, XIAO Zi-niu
. The Variations of Atmospheric Precipitable Water over Longitudinal Range-Gorge Region (LRGR) in Southwestern China[J]. JOURNAL OF NATURAL RESOURCES, 2008
, 23(4)
: 657
-664
.
DOI: 10.11849/zrzyxb.2008.04.013
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