广西“龙舟水”降水事件gnss可降水量演变及其驱动因素

IF 4.7 2区地球科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Pub Date : 2025-06-02 DOI:10.1109/JSTARS.2025.3575758

Ling Xiong;Liangke Huang;Zhixiang Mo;Xiangping Chen;Yifei Yang;Shaofeng Xie;Junyu Li;Lilong Liu

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引用次数: 0

摘要

可降水量（PWV）是量化大气水汽的重要指标，其演变与极端天气的形成和发展有着内在联系。作为中国南方端午节期间发生的一种强降雨，这种被称为“龙舟水”（DBW）的现象已经在广西造成了一系列灾难。因此，研究PWV的演变及其影响因素至关重要。全球导航卫星系统（GNSS）技术以其高时间分辨率、高精度、不受天气影响等优点，为PWV反演提供了一种可靠的方法。本文基于121个GNSS站点的2020 - 2022年GNSS数据以及欧洲中期天气预报中心5号（ERA5）大气再分析数据，获得了这些站点的GNSS-derived PWV。为了评估gnss衍生PWV的性能，将其与无线电探空仪进行了比较，证明了其高精度。结合ERA5再分析资料，分析了广西DBW事件期间gnss -检索PWV的演变，结果表明：水汽输送路径呈现由东南向西北方向发展的趋势；PWV总体呈东南向西北递减趋势，沿海地区高于内陆地区，平原地区集中度高于山区。进一步研究表明，gnss衍生的PWV演化受平均海平面气压（MSLP）、水平风速（u-wind）、垂直风速（v-wind）和2m温度（T2M）的协同效应支配。风场方向与PWV运动方向基本一致，PWV的大小与风场强度相对应。PWV分布与MSLP呈负相关，与T2M呈正相关。这些发现可以加深对PWV动力学的认识，提高对极端降水事件的预测。

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Evolution of GNSS-Derived Precipitable Water Vapor and Its Driving Factors During the “Dragon Boat Water” Rainfall Event in Guangxi, China

Precipitable water vapor (PWV) is an important indicator for quantifying atmospheric water vapor, and its evolution is intrinsically linked to the formation and development of extreme weather. As a type of heavy rainfall occurring during the Dragon Boat Festival in southern China, the phenomenon known as “dragon boat water” (DBW) has caused a series of disasters in Guangxi Province. Therefore, it is crucial to investigate PWV evolution and contributing factors. The PWV retrieved by Global Navigation Satellite System (GNSS) technology offers a reliable method due to its advantages of high-temporal resolution, high-precision, and weather-independent. In this article, the GNSS-derived PWV at the stations was obtained based on the GNSS data from 2020 to 2022 at 121 GNSS stations as well as the European Centre for Medium-Range Weather Forecasts Reanalysis 5 (ERA5) atmospheric reanalysis data. To assess the performance of the GNSS-derived PWV, it was compared with Radiosondes, demonstrating its high accuracy. Additionally, combined with ERA5 reanalysis data, the evolution of GNSS-retrieval PWV during the DBW event in Guangxi was analyzed, and the results showed that the direction of the water vapor transport pathway was from the southeast to the northwest. The overall trend of PWV decreased from southeast to northwest, with higher values observed in coastal areas compared to inland areas, and greater concentrations in plains than in mountains. Further investigation revealed that the evolution of GNSS-derived PWV was governed by the synergistic effects of mean sea level pressure (MSLP), horizontal wind speed (u-wind), vertical wind speed (v-wind), and 2 m temperature (T2M). The direction of the wind field generally aligned with the direction of PWV movement, and the magnitude of PWV corresponded with wind field intensity. The distribution of PWV was found to be negatively correlated with MSLP and positively correlated with T2M. These findings could deepen the understanding of PWV dynamics and improve the prediction of extreme precipitation events.

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来源期刊

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 地学-成像科学与照相技术

CiteScore

9.30

自引率

10.90%

发文量

563

审稿时长

4.7 months

期刊介绍： The IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing addresses the growing field of applications in Earth observations and remote sensing, and also provides a venue for the rapidly expanding special issues that are being sponsored by the IEEE Geosciences and Remote Sensing Society. The journal draws upon the experience of the highly successful “IEEE Transactions on Geoscience and Remote Sensing” and provide a complementary medium for the wide range of topics in applied earth observations. The ‘Applications’ areas encompasses the societal benefit areas of the Global Earth Observations Systems of Systems (GEOSS) program. Through deliberations over two years, ministers from 50 countries agreed to identify nine areas where Earth observation could positively impact the quality of life and health of their respective countries. Some of these are areas not traditionally addressed in the IEEE context. These include biodiversity, health and climate. Yet it is the skill sets of IEEE members, in areas such as observations, communications, computers, signal processing, standards and ocean engineering, that form the technical underpinnings of GEOSS. Thus, the Journal attracts a broad range of interests that serves both present members in new ways and expands the IEEE visibility into new areas.