DOI: 10.1007/s00382-016-3005-y
Scopus记录号: 2-s2.0-84957649395
论文题名: Impact of moisture divergence on systematic errors in precipitation around the Tibetan Plateau in a general circulation model
作者: Zhang Y. ; Li J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-09-10 起始页码: 2923
结束页码: 2934
语种: 英语
英文关键词: General circulation model
; Model errors
; Moisture divergence
; Precipitation
; Steep terrain
英文摘要: Current state-of-the-art atmospheric general circulation models tend to strongly overestimate the amount of precipitation around steep mountains, which constitutes a stubborn systematic error that causes the climate drift and hinders the model performance. In this study, two contrasting model tests are performed to investigate the sensitivity of precipitation around steep slopes. The first model solves a true moisture advection equation, whereas the second solves an artificial advection equation with an additional moisture divergence term. It is shown that the orographic precipitation can be largely impacted by this term. Excessive (insufficient) precipitation amounts at the high (low) parts of the steep slopes decrease (increase) when the moisture divergence term is added. The precipitation changes between the two models are primarily attributed to large-scale precipitation, which is directly associated with water vapor saturation and condensation. Numerical weather prediction experiments using these two models suggest that precipitation differences between the models emerge shortly after the model startup. The implications of the results are also discussed. © 2016, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53469
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, 46 Zhongguancun South St., Beijing, China; LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Zhang Y.,Li J.. Impact of moisture divergence on systematic errors in precipitation around the Tibetan Plateau in a general circulation model[J]. Climate Dynamics,2016-01-01,47(2017-09-10)