淮河流域混合云頻率、云高和含水量的毫米波云雷達(dá)資料分析

doi:10.3969/2015jms.0004

首頁(yè) > 過刊瀏覽>2016年第36卷第1期 >36-44. DOI:10.3969/2015jms.0004

淮河流域混合云頻率、云高和含水量的毫米波云雷達(dá)資料分析
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                        10.3969/2015jms.0004
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(41475035);江蘇省自然科學(xué)基金資助項(xiàng)目(BK20131433);氣象災(zāi)害教育部重點(diǎn)實(shí)驗(yàn)室(KLME1206);中國(guó)氣象局氣溶膠與云降水重點(diǎn)實(shí)驗(yàn)室課題(KDW1203)

Analysis on millimeter-wave cloud radar data of the occurrence frequency, the top height and the liquid water path of mixed phase clouds over Huai River basin

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本文選用2007年1月-2010年2月的CloudSat衛(wèi)星94 GHz探測(cè)資料(2B-GEOPROF)對(duì)淮河流域混合云出現(xiàn)頻率、云高以及含水量分布規(guī)律進(jìn)行了研究。研究結(jié)果表明:(1)混合云出現(xiàn)頻率和云高具有顯著的季節(jié)性變化特征,均表現(xiàn)為夏季值高、冬季低;(2)CloudSat 2B-CWC-RO反演產(chǎn)品在假設(shè)混合云冰水混合比與云內(nèi)溫度(-20~0℃)成線性關(guān)系條件下反演的液態(tài)水含量(LWP)與地面觀測(cè)值相差較大,本文利用冰水混合比與云內(nèi)溫度成指數(shù)函數(shù)關(guān)系反演的LWP更接近地面觀測(cè)值;(3)反演的LWP具有明顯的季節(jié)分布特征,其季節(jié)平均值夏秋季高、春冬季低?；旌显齐S著LWP值的增加,其對(duì)應(yīng)的雷達(dá)反照率因子范圍和出現(xiàn)的高度層越來越集中,混合云在對(duì)流層中下層的出現(xiàn)頻率隨LWP的增加而增多,出現(xiàn)頻率高值區(qū)及其分布的高度層也具有明顯的季節(jié)性特征,并與混合云零度層高度有密切關(guān)系。

Abstract:

By using the CloudSat data(2B-GEOPROF) provided by 94 GHz spaceborne radar from January 2007 to February 2010, the occurrence frequency, top height and the liquid water path(LWP) of the mixed phase clouds over Huai River basin were studied.Results show that:(1) both of the occurrence frequency and top height of mixed phase clouds show seasonal distribution characteristics, which are higher in summer and lower in winter;(2) the LWP provided by the Cloudsat Level 2B Standard Data Products(2B-CWC-RO)under the assume that the mixture ratio of ice and liquid water has linear relation with the temperature of cloud(-20℃-0℃) is remarkably different from the ground observation, however, the LWP retrieved by the exponential relationship between the mixture ratio of ice and liquid water and the temperature of cloud is much closer to the ground observation;(3) the retrieved LWP has obvious seasonal distribution characteristics, which show higher in summer and lower in winter. With the LWP of the mixed phase clouds increasing, the range of radar reflectivity and their altitude are more and more concentrated. The mixed phase clouds' occurrence frequency in lower troposphere increases with the LWP value increasing;the maximum value of corresponding radar reflectivity has remarkable seasonal characteristics, which is dependent on the height of 0℃ layer of mixed phase clouds.

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楊軻然,邱玉珺.淮河流域混合云頻率、云高和含水量的毫米波云雷達(dá)資料分析.氣象科學(xué),2016,36(1):36-44 YANG Keran, QIU Yujun. Analysis on millimeter-wave cloud radar data of the occurrence frequency, the top height and the liquid water path of mixed phase clouds over Huai River basin. Journal of the Meteorological Sciences,2016,36(1):36-44

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收稿日期:2014-11-02
最后修改日期:2015-01-16
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在線發(fā)布日期: 2016-04-11
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