評估FY-3A微波濕度計O-B對云的識別能力

doi:10.3969/2012jms.0186

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評估FY-3A微波濕度計O-B對云的識別能力
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                        10.3969/2012jms.0186
                    
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基金項目:國家自然科學(xué)基金資助項目(41175034)

Assessing the ability for using O-B of FY-3A microwave humidity sounders to identify clouds

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應(yīng)用FY-3A微波濕度計2010年1月份的Level-1c觀測亮度溫度O,NCEP GFS 6 h的預(yù)報場作為背景場,用RTTOV 9.3版本輻射傳輸模式模擬的亮度溫度B以及美國NOAA-18 MHS業(yè)務(wù)微波地表和降水產(chǎn)品,研究了雙權(quán)重質(zhì)量控制算法對FY-3A MWHS 通道3至5云和降水視場的識別能力。研究表明雙權(quán)重質(zhì)量控制算法判斷的負觀測增量O-B的離群點中,大多數(shù)都受云和降水影響。通道3約占60%,通道4約80%,通道5超過80%。當(dāng)降水率大于0.2 mm·h^-1時,通道3負離群點可識別超過60%降水云,隨著降水率增大識別率超過80%。而通道4對大于0.2 mm·h^-1的降水的識別率超過90%。通道5負離群點幾乎可以剔除100%的降水影響資料。在目前還沒有MWHS自身云檢測產(chǎn)品的條件下,雙權(quán)重質(zhì)量控制算法可剔除大部分云和降水影響視野。

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The ability that using bi-weighting quality control to identify FY-3A MWHS (Microwave Humidity Sounder) channel 3-5 clouds has been researched in this paper. The used data include FY-3A MWHS observed brightness temperature (O), simulated brightness temperature (B) by the Radiative Transfer Model(9.3V) based on 6 h forecast fields of the National Centers for Environmental Prediction, Global Forecast System(GFS) and NOAA-18 MHS retrieval products generated by NOAA Microwave Surface and Precipitation Products System during January 2010. The results show most of the negative O-B outliers identified by bi-weighting quality control are influenced by cloudy or rainy conditions. The percentage(%) of cloudy data shows all the negative outliers from FY-3A MWHS channel 3 to channel 5 are about 60%,80% and over 80% respectively. The high matching percentage between negative O-B outliers and precipitating clouds by traditional cloud-detection algorithm is over 60% for channel 3, more than 90% for channel 4 and nearly 100% for channel 5 when the rain rate is more than 0.2 mm·h^-1, which confirms that O-B can identify precipitable clouds quite well. The lack of 89 GHz prohibits the application of traditional cloud-detection algorithm to FY-3A microwave sounding data in NWP, however the bi-weighting quality control of O-B can identify most cloudy or rainy effects.

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劉兆祎,官莉.評估FY-3A微波濕度計O-B對云的識別能力.氣象科學(xué),2013,33(5):536-542 LIU Zhaoyi, GUAN Li. Assessing the ability for using O-B of FY-3A microwave humidity sounders to identify clouds. Journal of the Meteorological Sciences,2013,33(5):536-542

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收稿日期:2012-06-07
最后修改日期:2012-07-11
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在線發(fā)布日期: 2013-10-31
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