利用2013-2017年逐日07：00（北京时，下同）高空压温湿常规资料，19：00每隔50 m高空气温、气压、湿度和风速等加密资料，分别采用T-logP法和5点平滑位温梯度法计算了青海省茫崖、格尔木、都兰和西宁4个高空站的边界层高度，结合地面2006-2017年逐时、日资料，进一步分析其影响因子及其与灾害性天气的关系。结果表明：在研究区边界层高度西北高于东南，春季35月较高，4月茫崖最高达4500 m以上；边界层高度主要与最大地气温差、极大风速、气温日较差和降水有关，高原上地气温差越大、风速越大，湿度越小，边界层高度越高。浮尘边界层高度3月较高，为3578 m；其他风沙边界层高度均为4月较高，达3800~4000 m。沙尘暴持续时间越长，边界层高度越高；高原沙尘暴主要集中在下午到夜间，46月较高，夜间45月为3100~4200 m。降水对边界层高度有很大影响，随着降雨强度增强，边界层高度也随之降低，发生小、中、大雨时的边界层高度分别为3354，1855和1300 m；相应的边界层气压分别在480~640，590~720和650~710 hPa。高温边界层高度6月最高达5210 m，78月达3600 m以上；而雷暴边界层高度4月较高，达5050 m，56月在2100 m左右，79月降低至1100 m左右。由于510月95%以上雷暴伴有降水，因而雷暴边界层高度较低。
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.
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