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学科主题: 地理学::自然地理学
题名: Evaluation of WRF Simulations With Different Selections of Subgrid Orographic Drag Over the Tibetan Plateau
作者: Zhou, X (Zhou, X.)1; Beljaars, A (Beljaars, A.)2; Wang, Y (Wang, Y.)1, 3; Huang, B (Huang, B.)4; Lin, C (Lin, C.)5; Chen, Y (Chen, Y.)1; Wu, H (Wu, H.)6
通讯作者: Zhou, X
关键词: GRAVITY-WAVE-DRAG ; OFFICE UNIFIED MODEL ; GENERAL-CIRCULATION ; ANISOTROPIC OROGRAPHY ; BOUNDARY-LAYER ; ERA-INTERIM ; PARAMETRIZATION ; REPRESENTATION ; IMPACT ; FLOW
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
发表日期: 2017
DOI: 10.1002/2017JD027212
卷: 122, 期:18, 页:9759-9772
收录类别: SCI
合作性质: 国际
文章类型: Article
类目[WOS]: Meteorology & Atmospheric Sciences ; Meteorology & Atmospheric Sciences
研究领域[WOS]: Meteorology & Atmospheric Sciences
英文摘要: Weather Research and Forecasting (WRF) simulations with different selections of subgrid orographic drag over the Tibetan Plateau have been evaluated with observation and ERA-Interim reanalysis. Results show that the subgrid orographic drag schemes, especially the turbulent orographic form drag (TOFD) scheme, efficiently reduce the 10 m wind speed bias and RMS error with respect to station measurements. With the combination of gravity wave, flow blocking and TOFD schemes, wind speed is simulated more realistically than with the individual schemes only. Improvements are also seen in the 2 m air temperature and surface pressure. The gravity wave drag, flow blocking drag, and TOFD schemes combined have the smallest station mean bias (-2.05 degrees C in 2 m air temperature and 1.27 hPa in surface pressure) and RMS error (3.59 degrees C in 2 m air temperature and 2.37 hPa in surface pressure). Meanwhile, the TOFD scheme contributes more to the improvements than the gravity wave drag and flow blocking schemes. The improvements are more pronounced at low levels of the atmosphere than at high levels due to the stronger drag enhancement on the low-level flow. The reduced near-surface cold bias and high-pressure bias over the Tibetan Plateau are the result of changes in the low-level wind components associated with the geostrophic balance. The enhanced drag directly leads to weakened westerlies but also enhances the a-geostrophic flow in this case reducing (enhancing) the northerlies (southerlies), which bring more warm air across the Himalaya Mountain ranges from South Asia (bring less cold air from the north) to the interior Tibetan Plateau.
语种: 英语
WOS记录号: WOS:000416388000013
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7987
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing, Peoples R China.
2.ECMWF, Reading, Berks, England.
3.Univ Chinese Acad Sci, Beijing, Peoples R China.
4.Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, Trondheim, Norway.
5.Univ Gothenburg, Dept Earth Sci, Reg Climate Grp, Gothenburg, Sweden.
6.Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing, Peoples R China.

Recommended Citation:
Zhou, X ,Beljaars, A ,Wang, Y ,et al. Evaluation of WRF Simulations With Different Selections of Subgrid Orographic Drag Over the Tibetan Plateau[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(18):9759-9772.
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