摘要
采用中尺度模式WRF对夏季青藏高原地区降水进行了长达37天的积云可分辨模拟试验,在模式较好再现了夏季青藏高原降水的空间分布和日变化特征的基础上,利用高时空分辨率模拟结果进行了该地区水汽收支分析。结果表明:夏季青藏高原的降水主要来自水汽的辐合,辐合集中在低层,与青藏高原南部的夜间低空急流密切相关,具有显著的日变化特征;水汽收支方程中的垂直输送项起着将水汽从低层向中高层输送的重要作用,水汽局部变化项则很小,可以忽略;夏季青藏高原的蒸发主要集中在正午前后的6 h内,且蒸发量约为降水量的1/2,表明区域水汽再循环的重要性。
The summertime precipitation over the Qinghai-Xizang Plateau is simulated by a cloud-resolving model WRF. Compared with the TRMM data,the model can capture the distribution and the diurnal variation of the precipitation well. A moisture budget is calculated by using the high resolution model results. It shows that the precipitation mainly comes from the moisture flux convergence. Moisture flux convergence is mainly in the lower atmosphere. It is closely related to the nighttime low-level jet in the south and has strong diurnal variation. The vertical advection term transports the moisture from the low to the middle and high levels. The local change term is very small. The evaporation over the plateau during summer mainly focuses at 03: 00- 09: 00 UTC and is generally one half of the precipitation,indicating the importance of the regional moisture recycle.
出处
《高原气象》
CSCD
北大核心
2014年第5期1173-1181,共9页
Plateau Meteorology
基金
国家自然基金项目(41105073
41175016
41075038)
2009年度暴雨研究开放基金项目(IHR2009G05)
公益性行业(气象)科研专项(GYHY201206041)
关键词
青藏高原
水汽收支
夏季降水
蒸发
The Qinghai-Xizang Plateau
Moisture budget
Precipitation in summer
Evaporation
