利用西高止山脉的再分析和观测数据集研究极端降水事件的演变过程

IF 3.5 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Leena Khadke, Sachin Budakoti, Akash Verma, Moumita Bhowmik, Anupam Hazra
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引用次数: 0

摘要

近几十年来,印度极端天气事件的强度、频率和范围都在增加。印度西海岸极端降水量的普遍增加引起了人们的极大关注。由于气象和海洋变量以及相关大尺度环流的多变性,导致这种破坏性极端降水的因素仍不清楚。利用再分析和观测数据集,我们试图结合气候学,找出导致 2019 年 8 月 1 日至 10 日异常降水的动态、热力学和云微观物理过程。我们的主要发现强调了温暖的海面温度(异常值为1.4°C)、外向长波辐射(异常值为-50 W-m-2)和大气温度(海洋上空异常值为1.6°C)在将大气的持湿能力提高近10%方面的关键作用。在加强的低空风(异常值超过 4 m-s-1)的推动下,水汽的增加导致了从海洋向陆地的转移。值得注意的是,我们观察到垂直上升气流(异常值>-0.4 m-s-1)增加了大气的不稳定性和水汽汇聚。大量云水文介质(异常值超过 2.5 × 10-4 kg-kg-1)的存在为持续强降水创造了有利条件。我们的研究结果加深了我们对海洋和大气动力学以及风模式之间复杂关系的理解,并强调了它们对区域天气模式和陆地表面水文的关键影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Examining the evolution of extreme precipitation event using reanalysis and the observed datasets along the Western Ghats

In recent decades, India has witnessed an increase in the intensity, frequency, and spread of extreme weather events. The widespread increase in extreme precipitation over the Western Coast of India is a matter of great concern. The factors contributing to such devastating extreme precipitation remain unclear due to the variability present in meteorological and oceanic variables and associated large-scale circulations. Using reanalysis and observed datasets, we attempted to identify a combination of dynamic, thermodynamic, and cloud microphysics processes contributing to the anomalous precipitation from August 1 to 10, 2019 against its climatology. Our key findings highlight the crucial role of warm sea surface temperatures (anomaly >1.4°C), outgoing longwave radiation (anomaly <−50 W·m−2), and atmospheric temperature (anomaly over the ocean is >1.6°C) in enhancing the moisture-holding capacity of the atmosphere by almost 10%. This elevated moisture, propelled by intensified low-level winds (anomalies exceeding 4 m·s−1), leads to a shift from ocean to land. Notably, we observe that vertical updrafts (anomalies >−0.4 m·s−1) contribute to increased atmospheric instability and moisture convergence. The presence of an ample amount of cloud hydrometeors, with anomalies surpassing 2.5 × 10−4 kg·kg−1, establishes conditions conducive to sustained intense precipitation. Our findings deepen our understanding of the complex relationships between ocean and atmospheric dynamics, and wind patterns, and emphasize their pivotal influence on regional weather patterns and land surface hydrology.

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来源期刊
International Journal of Climatology
International Journal of Climatology 地学-气象与大气科学
CiteScore
7.50
自引率
7.70%
发文量
417
审稿时长
4 months
期刊介绍: The International Journal of Climatology aims to span the well established but rapidly growing field of climatology, through the publication of research papers, short communications, major reviews of progress and reviews of new books and reports in the area of climate science. The Journal’s main role is to stimulate and report research in climatology, from the expansive fields of the atmospheric, biophysical, engineering and social sciences. Coverage includes: Climate system science; Local to global scale climate observations and modelling; Seasonal to interannual climate prediction; Climatic variability and climate change; Synoptic, dynamic and urban climatology, hydroclimatology, human bioclimatology, ecoclimatology, dendroclimatology, palaeoclimatology, marine climatology and atmosphere-ocean interactions; Application of climatological knowledge to environmental assessment and management and economic production; Climate and society interactions
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