單多普勒雷達(dá)徑向風(fēng)同化的改進(jìn)

doi:10.3969/2013jms.0038

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單多普勒雷達(dá)徑向風(fēng)同化的改進(jìn)
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                        10.3969/2013jms.0038
                    
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基金項(xiàng)目:國家重點(diǎn)研究發(fā)展計(jì)劃(973計(jì)劃)項(xiàng)目(2013CB430101);北京市科委綠色通道項(xiàng)目(Z121100004912006);國家自然基金重點(diǎn)項(xiàng)目(90815028);中國氣象局?jǐn)?shù)值預(yù)報(bào)(GRAPES)發(fā)展專項(xiàng)

Improvement of radial wind data assimilation of single Doppler radar

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基于現(xiàn)有的單多普勒雷達(dá)徑向速度資料直接同化和間接同化方法,提出了一種改進(jìn)同化方法,通過引入反演方程組作為觀測(cè)算子,將分析單元內(nèi)徑向風(fēng)的空間變化信息作為同化變量.同時(shí),根據(jù)模式的分辨率和精度要求調(diào)整分析單元大小,從而能夠有效地彌補(bǔ)數(shù)據(jù)稀釋化所帶來的高分辨率數(shù)據(jù)遺失問題.相對(duì)于直接同化只同化雷達(dá)觀測(cè)徑向風(fēng),改進(jìn)方法不僅包含徑向風(fēng)信息,而且包含徑向風(fēng)的空間變化信息;相對(duì)于傳統(tǒng)的間接同化,改進(jìn)方法不直接使用強(qiáng)約束求解析風(fēng)場,避免了將反演風(fēng)場完全等同于"觀測(cè)風(fēng)場",能夠較大程度地克服反演誤差對(duì)同化效果的影響.通過理想實(shí)驗(yàn)和觀測(cè)系統(tǒng)模擬試驗(yàn)表明:改進(jìn)方法對(duì)于傳統(tǒng)的直接同化和間接同化具有一定的兼容性,應(yīng)用靈活,具有積極的改進(jìn)意義.

Abstract:

Based on the direct and indirect assimilation methods of single Doppler radar radial velocity, an improved method was proposed. In the improved method, the Doppler radar wind retrieval equations were used as observation operators, the spatial variation information of the radial velocity in a given analysis unit was regarded as variables, meanwhile, the size of analysis unit size was adjusted according to the resolution and precision requirement of the model, which which makes up for the data thinning problem. Compared with the direct assimilation method, the improved method introduced not only the radial velocity information, but its spatial variation information. Compared with the indirect methed, the improved one avoided the weakness induced by retrieval wind calculated from analytical solution with strong constraint so as to reduce the impact of retrieval error effectively. The ideal experiment and OSSE (Observer System Simulations experiments) show that the improved method has better performance in being compatible for direct and indirect assimilation methods.

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羅義,梁旭東,陳明軒.單多普勒雷達(dá)徑向風(fēng)同化的改進(jìn).氣象科學(xué),2014,34(6):620-628 LUO Yi, LIANG Xudong, CHEN Mingxuan. Improvement of radial wind data assimilation of single Doppler radar. Journal of the Meteorological Sciences,2014,34(6):620-628

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收稿日期:2013-04-11
最后修改日期:2013-04-30
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在線發(fā)布日期: 2015-01-14
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