廣州極端降水微物理特征的雙偏振雷達(dá)研究

doi:10.12306/2021jms.0103

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廣州極端降水微物理特征的雙偏振雷達(dá)研究
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                        10.12306/2021jms.0103
                    
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中圖分類號(hào):P426.6;P413
基金項(xiàng)目:國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2019YFC1510400）；廣東省自然科學(xué)基金項(xiàng)目（2022A1515011346）；廣東省氣象局科技項(xiàng)目（GRMC2020Z08）；雷達(dá)應(yīng)用及強(qiáng)對(duì)流短臨預(yù)警技術(shù)創(chuàng)新團(tuán)（GRMCTD202002）

Research on microphysical characteristics of extreme precipitation in Guangzhou based on Dual-polarization

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摘要:

利用2017年廣州S波段雙偏振雷達(dá)和地面自動(dòng)站小時(shí)雨量資料，對(duì)比分析了廣州極端降水（雨強(qiáng)≥50 mm·h^-1）與強(qiáng)降水（雨強(qiáng)為20~50 mm·h^-1）的微物理特征。結(jié)果表明：極端降水的20 dBZ和30 dBZ回波發(fā)展高度與強(qiáng)降水都差異較小，說明廣州地區(qū)的降水強(qiáng)度與對(duì)流發(fā)展高度關(guān)系不大。在低層，極端降水平均回波更強(qiáng)，雨滴粒徑更大，結(jié)合Z_H-Z_DR的分布表明廣州地區(qū)降水具有海洋性對(duì)流特征。與強(qiáng)降水對(duì)比，0℃層以下極端降水的Z_H、Z_DR、K_DP值都明顯更大，尤其在4~5 km都快速增長(zhǎng)，說明廣州地區(qū)極端降水的發(fā)展關(guān)鍵在4~5 km高度，并在下落過程中繼續(xù)增長(zhǎng)，因此造成極端降水的發(fā)生。

Abstract:

Using the S-band Dual-polarization radar data and hourly rain gauge data in 2017, the microphysical characteristics of extreme precipitation (more than 50 mm·h^-1) in Guangzhou are statistically analyzed. A comparative analysis of extreme precipitation and strong precipitation (20-50 mm·h^-1) is also applied. The results show that there is little difference between the two types of precipitation with respect of 20 dBZ and 30 dBZ echo height, indicating the intensity of precipitation over Guangzhou has little relation with the height of convection. In the lower layer, stronger average echo and larger raindrops can be seen in the extreme precipitation rather than strong precipitation. Combined with the distribution of Z_H-Z_DR, it shows that both types of precipitation over Guangzhou possess characteristics of maritime convection. Compared with strong precipitation, the values of Z_H, Z_DR and K_DP of extreme precipitation below 0℃ layer are significantly larger, especially at 4-5 km, and they all increase rapidly and continue to increase in the falling process at 4-5 km, indicating that the microphysical processes at 4-5 km are critical to extreme precipitation and thus causing the occurrence of extreme precipitation in Guangzhou.

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馮嘉寶,張羽,田聰聰,傅佩玲.廣州極端降水微物理特征的雙偏振雷達(dá)研究.氣象科學(xué),2023,43(2):278-284 FENG Jiabao, ZHANG Yu, TIAN Congcong, FU Peiling. Research on microphysical characteristics of extreme precipitation in Guangzhou based on Dual-polarization. Journal of the Meteorological Sciences,2023,43(2):278-284

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收稿日期:2021-07-10
最后修改日期:2021-10-19
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在線發(fā)布日期: 2023-05-20
出版日期: 2023-04-15

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