1980-2020 年暖季期间云贵高原中部在冷和暖高层异常背景下的夜间极端降雨量

IF 2.5 4区 地球科学 Q3 ENVIRONMENTAL SCIENCES
Atmosphere Pub Date : 2024-09-01 DOI:10.3390/atmos15091057
Weihua Yuan, Zhi Li
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引用次数: 0

摘要

利用云贵高原中部的小时雨量计记录、ERA5再分析资料、TRMM和风云卫星资料,研究了高层冷暖异常下极端降雨的时空和云层特征,旨在完善对不同类型极端降雨的认识。与正温度异常(暖事件)相比,高层负温度异常(冷事件)下的极端降雨呈现出更强的对流云特征。冷事件的最大降雨强度和持续时间远大于暖事件,而云顶亮度温度较低,对流降雨比例较高。在冷事件中,对流层中高层以冷异常为主,在 YGP 中心周围观测到上层(下层)冷(暖)异常的不稳定构造。虽然高层温度异常为正值,但在暖事件中,YGP 中央上空也出现了异常的偏南风和偏北风的发散和辐合,以及强烈的水汽中心和上升运动。在高层冷异常环流作用下,大气不稳定性增强,对流能量增大,这与YGP中部上空的降雨特征密切相关。结果表明,对流层上层温度对极端降雨有重要影响,因此在今后的分析中应更加关注对流层上层温度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nocturnal Extreme Rainfall over the Central Yungui Plateau under Cold and Warm Upper-Level Anomaly Backgrounds during Warm Seasons in 1980–2020
The spatiotemporal and cloud features of the extreme rainfall under the warm and cold upper-level anomalies over the central Yungui Plateau (YGP) were investigated using the hourly rain gauge records, ERA5 reanalysis data, TRMM, and Fengyun satellite data, aiming to refine the understanding of different types of extreme rainfall. Extreme rainfall under an upper-level negative temperature anomaly (cold events) presents stronger convective cloud features when compared with the positive temperature anomaly (warm events). The maximum rainfall intensity and duration in cold events is much larger than that of warm events, while the brightness temperature of the cloud top is lower, and the ratio of convective rainfall is higher. In cold events, the middle-to-upper troposphere is dominated by a cold anomaly, and an unstable configuration with upper (lower) cold (warm) anomalies is observed around the central YGP. Although the upper-level temperature anomaly is positive, the anomalous divergence and convergence of southerly and northerly winds, as well as the strong moisture center and upward motions, are also found over the central YGP in warm events. The stronger atmospheric instability and higher convective energy under the upper-level cold anomalous circulation are closely associated with the rainfall features over the central YGP. The results indicate that the upper tropospheric temperature has significant influences on extreme rainfall, and thus more attention should be paid to the upper tropospheric temperature in future analyses.
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来源期刊
Atmosphere
Atmosphere METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.60
自引率
13.80%
发文量
1769
审稿时长
1 months
期刊介绍: Atmosphere (ISSN 2073-4433) is an international and cross-disciplinary scholarly journal of scientific studies related to the atmosphere. It publishes reviews, regular research papers, communications and short notes, and there is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles.
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