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ISSN 1006-9895

CN 11-1768/O4

基于WRF模式的海面湍流通量参数化方案的研究
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中国科学院 “百人计划” 项目 “海—气、陆—气相互作用观测与模拟研究”


Air-Sea Turbulent Flux Parameterization Schemes in the WRF Model
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    摘要:

    中尺度数值模拟结果特别是高影响天气的精细预报对近地层动量和热量通量极为敏感, 因此近地层湍流通量参数化方案一直是大气科学研究中一个十分重要的课题。以TOGA-COARE观测试验资料为基础, 本文将湍流通量参数化方案模块从天气研究预报 (WRF) 模式中提取出来, 与最新研发的湍流通量参数化方案 (即LGLC方案) 进行对比测试分析。结果表明, 由于算法本身的精确性且区分了热力粗糙度和动力粗糙度, LGLC得出的风应力、 感热通量、 潜热通量的模拟结果与WRF方案得出的结果相比, 普遍与真实值更接近, 特别是风应力和潜热通量的模拟结果相比WRF方案的模拟有了显著的提高。同时LGLC为非迭代方案, 相比WRF中的迭代方案能够节省可观的CPU时间。该离线测试结果为将来把LGLC方案放入模式中去进行在线测试, 奠定了基础。

    Abstract:

    The subtle forecast of high-impact weather events by the mesoscale numerical simulation is sensitive to the surface momentum and heat fluxes, so the development of reliable surface turbulent flux parameterization schemes has been a very important research subject. Using the Tropical Ocean-Global Atmosphere Coupled Ocean-Atmosphere Response Experiment (TOGA COARE) data, the authors compared the Blackadar scheme of the Weather Research Forecast (WRF) model against the air-sea turbulent flux parameterization scheme developed recently (i.e. LGLC scheme). The results show that the turbulent fluxes are better estimated with the new scheme than with the Blackadar scheme, especially for the wind stress and the latent heat flux, because the new scheme accurately describes the relationship between the Obukhov length and the Richarson number and takes account of the difference between dynamic roughness and thermal roughness. Meanwhile the LGLC scheme is a non-iterative scheme, and can save more CPU time in comparison with the iterative scheme in the WRF model. This offline test results form a basis for further online tests.

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张滢滢,沈新勇,高志球.基于WRF模式的海面湍流通量参数化方案的研究.大气科学,2011,35(4):767~776 ZHANG Yingying, SHEN Xinyong, GAO Zhiqiu. Air-Sea Turbulent Flux Parameterization Schemes in the WRF Model. Chinese Journal of Atmospheric Sciences (in Chinese),2011,35(4):767~776

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  • 在线发布日期: 2011-12-06
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