南京双偏振雷达2020—2022暖季观测极端降雨的对流云宏微观特征

王赢; 罗亚丽; 刘希; 吴翀; 任福民

doi:10.16032/j.issn.1004-4965.2025.037

南京双偏振雷达2020—2022暖季观测极端降雨的对流云宏微观特征

doi: 10.16032/j.issn.1004-4965.2025.037

王赢¹,
罗亚丽^{2, 3, ,},
刘希⁴,
吴翀¹,
任福民¹

1.
中国气象科学研究院灾害天气国家重点实验室，北京 100081
2.
南京信息工程大学气候系统预测与变化应对全国重点实验室/气象灾害预报预警与评估协同创新中心/气象灾害教育部重点实验室，江苏南京 210044
3.
南京信息工程大学大气科学学院，江苏南京 210044
4.
南京气象科技创新研究院/中国气象局交通气象重点开放实验室，江苏南京 210041

基金项目:

国家自然科学基金项目 42030610

南京信息工程大学高层次人才科研启动项目 2023r21

灾害天气国家重点实验室开放课题 2023LASW-B16

江苏省自然科学基金项目 BK20231107

详细信息

通讯作者:
罗亚丽，女，贵州省人，教授，主要从事对流演变机理与数值模拟等研究。E-mail：yali.luo@nuist.edu.cn

中图分类号: P458.121
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- 文章访问数: 33
- HTML全文浏览量: 8
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- 被引次数: 0
出版历程
- 收稿日期: 2023-12-21
- 修回日期: 2025-03-28
- 网络出版日期: 2025-07-06
- 刊出日期: 2025-06-20

Macro- and Microphysical Characteristics of Extreme Rainfall Producing-convective Clouds Observed by the Nanjing Dual-polarimetric Radar During the 2020-2022 Warm Seasons

WANG Ying¹,
LUO Yali^{2, 3
, ,},
LIU Xi⁴,
WU Chong¹,
REN Fumin¹

1.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China
2.
CPRM/KLME/CIC-FEMD, Nanjing University of Information Science and Technology, Nanjing 210044, China
3.
School of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China
4.
Key Laboratory of Transportation Meteorology of China Meteorological Administration, Nanjing Joint Institute for Atmospheric Sciences, Nanjing 210041, China

摘要

摘要: 全球变暖背景下极端降水发生频次升高，但不同地区不同程度极端降水的对流云宏微观特征的认识仍然不清晰。利用2020—2022年5—9月南京地区S波段双偏振雷达观测数据，定义“极端降水对流体” (Extreme Precipitation Feature，EPF)，根据雨强极端程度分为三组EPF (ER1、ER2、ER3)，进一步分为强对流、中等强度对流和弱对流EPF，分析其对流云宏微观特征。结果表明，随着极端雨强强度增强，EPF的40 dBZ区域水平尺寸增大，20 dBZ区域尺寸变化较小；强对流EPF占比明显上升(11.4%~25.4%)，弱对流EPF占比显著下降(36.6%~23.8%)；强对流和中等强度对流EPF的液水和冰水含量均显著增加，混合相和液相微物理过程都更加活跃。三种雨强阈值下，强对流EPF的液相微物理过程均以尺度分选、蒸发为主(43.9%~50.8%)，弱对流EPF的液相微物理过程以碰并为主(76.9%~75.3%)，雨滴谱分布介于海洋性与大陆性之间、但偏向海洋性对流，数浓度与雨滴粒径频次峰值类属海洋性对流，数浓度平均值高于大陆性对流、雨滴直径平均值大于海洋性对流。随雨强极端程度的升高，液相微物理过程中雨滴碰并的占比仅略有减少、破碎的占比略有上升，雨滴平均粒子大小和数浓度变化不明显。
- 极端降水 /
- 对流强度 /
- 南京地区 /
- 双偏振雷达 /
- 微物理特征
Abstract: Despite global warming increases extreme precipitation frequency, the understanding of the macro-and microphysical characteristics of extreme precipitation-producing convective clouds in different regions remains incomplete. This study utilizes dual-polarization radar and rain gauges data (May-September 2020-2022) in the Nanjing area to compare three rainfall intensity-based Extreme Precipitation Features(EPFs) groups (ER1, ER2, ER3). Each group is further categorized into EPFs with intense, moderate and weak convection. It is found that, as the rainfall extremity increases, the horizontal extent of 40 dBZ region in EPFs increases, whereas 20 dBZ regions exhibit minimal changes. The proportion of intense convection EPFs rises from 11.4% to 25.4%, while the proportion of weak convection declines from 36.6% to 23.8%. The liquid and ice water contents in intense and moderate convection EPFs increase significantly with more extreme rainfall, while both mixed - and liquid-phase processes become more active. In EPFs with intense convection, liquid-phase processes are mainly dominated by size sorting and evaporation, while EPFs with weak convection are governed by coalescence. The raindrop size distributions resemble maritime-like convection, with characteristics between "maritime-like" and "continental-like" convection. The peak values of concentration and droplets size belong to "maritimelike" convection, with raindrop size distributions featuring a mean size large than "maritime-like" droplets and a concentration much higher than "continental-like" raindrops. As the rainfall extremity increases, liquid-phase processes show a slightly decrease in raindrop coalescence and a slight increase in raindrop breakup. The average raindrops size and concentration of ER1 to ER3 exhibit minimal variation.
- extreme precipitation /
- convective intensity /
- Nanjing area /
- dual-polarimetric radar /
- microphysical characteristics

HTML全文

图 1 NJRD观测范围内地形高度(a, 灰色阴影；单位：m)，“+”代表NJRD的位置，“*”代表二维雨滴谱仪位置，两个圆代表距离NJRD半径为30 km、85 km的圆，蓝点代表雨量计; 2020年8月9日12时42分(北京时)NJRD观测到的组合反射率水平分布图(b)，分别对20 dBZ以及40 dBZ区域利用最小二乘法进行椭圆拟合，AB和CD分别为40 dBZ以及20 dBZ区域的长轴，EF为40 dBZ区域的短轴

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图 2 小提琴图：40 dBZ水平尺度(a)，20 dBZ水平尺度(b)，40 dBZ区域长轴与短轴之比(c)，20 dBZ区域长轴与短轴之比(d)

圆点表示平均值，盒须图从下至上的横线表示第10、25、50、75、90百分位，浅灰色阴影表示样本的分布密度。三种颜色代表不同雨强极端程度：ER1(蓝色)，ER2(绿色)，ER3(红色)。

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图 3 MaxHt_40dBZ累积分布函数(a)，上方小方框显示强对流、中对流和弱对流EPF比例(%)；MaxHt_40dBZ概率密度函数(b)

蓝色、绿色、红色分别代表不同雨强极端程度：ER1，ER2，ER3。

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图 4 Z_H、Z_dr、K_dp的VP95及各高度上第25百分位至75百分位的范围

5 km高度的黑色实线代表 0 ℃线：蓝色、绿色、红色分别代表不同雨强极端程度ER1、ER2、ER3。

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图 5 强对流(上)、中等强度对流(中)、弱对流(下)每个EPF的第95百分位Z_H (dBZ)、Z_dr (dB)、K_dr (°·km^-1) 平均垂直廓线(VP95)

横线表示第25百分位至75百分位的范围；ER1、ER2、ER3分别用蓝色、绿色、红色表示。黑色实线代表 0 ℃高度。

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图 6 ER1 (蓝色)、ER2 (绿色)、ER3 (红色)每个EPF中值IWC (a、b、c、d)和LWC (e、f、g、h)平均垂直廓线

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图 7 1 km高度上每个EPF取D_m中值和lgN_w中值，ER1、ER2、ER3每组EPF的二维频次分布图(a、c、e)，黑色“x”和白色“+”分别代表平均值和频率峰值所在位置，平均值数值标注在右上方；3 km至1.5 km高度每个EPF取中值相减的(ΔZ_H与ΔZ_dr)二维频次分布图(b、d、f)，各个象限代表含义和占比分别用灰色和红色字体标注

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图 8 强对流(上面一行)、中等强度对流(中间一行)、弱对流(下面一行)ΔZ_H与ΔZ_dr二维频次分布图

各个象限代表含义和占比分别用灰色和红色字体标注。

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表 1 不同雨强以及不同对流强度的EPF数量(个)

对流强度	ER1	ER2	ER3
强对流	1 209	796	189
中等强度对流	5 523	2 046	378
弱对流	3 879	847	177

下载: 导出CSV

表 2 EPF第50百分位IWP和LWP的平均值(kg·m^-2)

对流强度	ER1		ER2		ER3
对流强度	IWP	LWP	IWP	LWP	IWP	LWP
总体EPF	1.86	5.06	2.35	5.73	2.57	5.79
强对流EPF	3.9	7.25	4.06	7.36	4.35	7.58
中等强度对流EPF	1.56	5.31	1.73	5.71	1.81	5.69
弱对流EPF	0.77	3.95	0.73	4.16	0.71	4.01

下载: 导出CSV

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