用雷達反演資料診斷江蘇地區(qū)一次暴雨過程

doi:10.3969/2014jms.0065

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用雷達反演資料診斷江蘇地區(qū)一次暴雨過程
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                        10.3969/2014jms.0065
                    
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基金項目:公益性行業(yè)(氣象)科研專項(GYHY201306078);國家自然科學基金青年科學基金項目(41105023);氣象關鍵技術集成與應用項目(CMAGJ2013M19);江蘇省氣象局北極閣開放研究基金項目(BJG201301);"十二五"國家科技支撐計劃項目(2014BAG01B01)

Diagnostic analysis on a rainstorm of Jiangsu province by radar inversed data

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對2010年7月12日發(fā)生在江蘇中部地區(qū)一次暴雨天氣過程產(chǎn)生的原因、多普勒雷達圖像產(chǎn)品特征及由雷達數(shù)據(jù)反演的物理量場進行了診斷分析和定量評估,得出如下結論:雷達徑向速度圖像特征變化反映了風場輻合輻散特征的變化,有助于了解雨勢增減情況。多普勒雷達徑向速度提取的散度數(shù)據(jù)與NCEP散度數(shù)據(jù)整體趨勢上是一致的,但輻合輻散中心區(qū)位置及強度存在差別,雷達反演散度強度較NCEP大4~5倍,天氣過程變化期間兩者散度在垂直高度場的配置調(diào)整均能反映降水動力場變化;400hPa及以下高度反演的平均散度更可信;對于雨強小于等于16mm/h的降水天氣過程效果更好。由雷達基數(shù)據(jù)定量計算得到的平均散度特征和垂直速度隨時間和高度的變化,能較好的反映出強降水過程的動力學特性;雷電頻次與強降水出現(xiàn)時次有一定相關性,約有1~2h提前量,雷電發(fā)生隨時間演變與雷達回波強度時空分布較為吻合,云底動能施力參量一定程度可以描述閃電增長情況,較降雨量約有40min左右的提前量,有一定預警能力。

Abstract:

The reasons, radar image products features and radar inversed physical quantity of a rainstorm in the central Jiangsu on 12 July, 2010 are diagnostically analyzed and quantitatively estimated. Results show that the wind field divergence feature reflected by the radar radial velocity helps understand the rain tendency. The divergence data extracted from the Doppler radar radial velocity and from NCEP tended to be consistent, but differences existed in position and intensity between convergence and divergence. The radar inversion divergence intensity is 4-5 times stronger than the NCEP one. Both of the two divergences during the adjustment of vertical height field configuration can reflect precipitation dynamic field change of the heavy rainstorm. The average divergence inversed below 400 hPa is more reliable, especially for the precipitation process whose rainfall rate was lower than 16 mm/h. The average divergence and vertical velocity characteristics calculated quantitatively by the radar base data turned to change with time and height, which reflected the dynamics characteristics of strong rainfall process;the frequent lightning appeared 1-2h ahead of the rainstorm occurrence, and the evolution of lightning with time was consistent with the temporal and spatial distribution of radar echo intensity, so that it is feasible to describe the lightning growth by E_kin, and there were 40 mins approximately before rainfall, which helped forecast rainfall.

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陳曦,徐芬,王振會,蔣義芳.用雷達反演資料診斷江蘇地區(qū)一次暴雨過程.氣象科學,2015,35(5):629-637 CHEN Xi, XU Fen, WANG Zhenhui, JIANG Yifang. Diagnostic analysis on a rainstorm of Jiangsu province by radar inversed data. Journal of the Meteorological Sciences,2015,35(5):629-637

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收稿日期:2014-04-29
最后修改日期:2014-08-01
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在線發(fā)布日期: 2015-11-13
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