Using routine data of daily high altitude pressure, temperature and humidity at 07:00 (Beijing Time, after the same) and every 50 m infilling data of daily high altitude pressure, temperature, humidity and wind at 19:00 in 2013-2017, T-logP method and 5 point smooth potential temperature gradient method were used to calculate the boundary layer height (BLH) of four stations in Qinghai, namely Mangya, Golmud, Dulan and Xining, respectively. Based on the surface hourly and daily data from 2006 to 2017, the influence factors and their relationships with disaster weathers were further analyzed. The results showed that the BLHs were higher in the northwest than in the southeast over research region, and higher in the spring of March and May, and the highest in April that was more than 4500 m. The BLH was mainly related to the maximum ground temperature difference, maximum wind speed, daily temperature range and precipitation. The bigger ground temperature difference, the higher the wind speed and the smaller humidity were, the higher the BLH was. In the BLHs of wind and sand, the highest height of dust was 3578 m in March, and that in other wind-sand weather was between 3800~4000 m in April. The longer the dust storm lasted, the higher the BLH was. The sandstorm in the Plateau was mainly concentrated in the afternoon and night from April to June, which was 3100~4200 m from April to May. Precipitation had a great influence on BLH, with the increase of rainfall intensity, the BLH decreased. The maximum height of light rain, moderate rain and heavy rain was 3354, 1855 and 1300 m respectively, further corresponding pressure of the boundary layer was 480~640 hPa of light rain, 590~720 hPa of moderate rain and between 650~710 hPa of heavy rain. The BLH of high temperature reached 5210 m in June and more than 3600 m in JulyAugust, while the thunderstorm decreased from 5050 m in April, 2100 m from May to June and to 1100 m from July to September. The BLH of thunderstorm was lower because more than 95% of thunderstorms were accompanied by precipitation from May to October.
MA Yuancang
,
LI Yanying
,
YANG Jiping
,
ZENG Ting
,
ZHANG Aiping
,
ZHANG Chunyan
. Relationships between Boundary Layer Height and Different Disaster Weathers in North-Central Qinghai Province[J]. Plateau Meteorology, 2019
, 38(5)
: 1048
-1057
.
DOI: 10.7522/j.issn.1000-0534.2018.00136
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