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Implementation of a turbulent orographic form drag scheme in WRF and its application to the Tibetan Plateau
Zhou, X (Zhou, Xu)1; Yang, K (Yang, Kun)1,2,3; Wang, Y (Wang, Yan)1,4
Source PublicationCLIMATE DYNAMICS
2018-04-01
Volume50Issue:2019-07-08Pages:2443-2455
DOI10.1007/s00382-017-3677-y
Abstract

Sub-grid-scale orographic variation (smaller than 5 km) exerts turbulent form drag on atmospheric flows and significantly retards the wind speed. The Weather Research and Forecasting model (WRF) includes a turbulent orographic form drag (TOFD) scheme that adds the drag to the surface layer. In this study, another TOFD scheme has been incorporated in WRF3.7, which exerts an exponentially decaying drag from the surface layer to upper layers. To investigate the effect of the new scheme, WRF with the old scheme and with the new one was used to simulate the climate over the complex terrain of the Tibetan Plateau from May to October 2010. The two schemes were evaluated in terms of the direct impact (on wind fields) and the indirect impact (on air temperature and precipitation). The new TOFD scheme alleviates the mean bias in the surface wind components, and clearly reduces the root mean square error (RMSEs) in seasonal mean wind speed (from 1.10 to 0.76 m s(-1)), when referring to the station observations. Furthermore, the new TOFD scheme also generally improves the simulation of wind profile, as characterized by smaller biases and RMSEs than the old one when referring to radio sounding data. Meanwhile, the simulated precipitation with the new scheme is improved, with reduced mean bias (from 1.34 to 1.12 mm day(-1)) and RMSEs, which is due to the weakening of water vapor flux at low-level atmosphere with the new scheme when crossing the Himalayan Mountains. However, the simulation of 2-m air temperature is little improved.

Subject Area地理学
WOS IDWOS:000428600200008
Language英语
Indexed BySCIE
KeywordOffice Unified Model Gravity-wave-drag Anisotropic Orography Boundary-layer Climate Parameterization Parametrization Representation Flow Impact
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
Cooperation Status国内
ISSN0930-7575
Department环境变化与地表过程重点实验室
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8691
Collection图书馆
Corresponding AuthorZhou, X (Zhou, Xu)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Bldg 3,Courtyard 16,Lincui Rd, Beijing 100101, Peoples R China;
2.Tsinghua Univ, Dept Earth Syst Sci, Minist Educ, Key Lab Earth Syst Modeling, Beijing 10084, Peoples R China;
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Zhou, X ,Yang, K ,Wang, Y . Implementation of a turbulent orographic form drag scheme in WRF and its application to the Tibetan Plateau[J]. CLIMATE DYNAMICS,2018,50(2019-07-08):2443-2455.
APA Zhou, X ,Yang, K ,&Wang, Y .(2018).Implementation of a turbulent orographic form drag scheme in WRF and its application to the Tibetan Plateau.CLIMATE DYNAMICS,50(2019-07-08),2443-2455.
MLA Zhou, X ,et al."Implementation of a turbulent orographic form drag scheme in WRF and its application to the Tibetan Plateau".CLIMATE DYNAMICS 50.2019-07-08(2018):2443-2455.
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