Spatiotemporal Variability of Hot Days in Association with the Large-Scale Atmospheric Drivers over Vietnam

IF 2.1 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Chinh Ta Huu, Tan Phan Van, Khiem Mai Văn, Thang Vu Van, Lam Hoang Phuc, Worapong Lohpaisankrit, Quoc Bao Pham, Trinh Trong Nguyen, Phong Nguyen Thanh
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Abstract

The severe heatwaves and hot spells in Vietnam were observed more frequently in intensity and duration due to global warming and climate change impacts. The hot days and extreme summer events make the weather harsh and significantly affect human health and the environment. This study presents the spatiotemporal distribution of the number of hot days (NHDs) in Vietnam. The variability of NHD in seven climate subregions is also examined in association with the large-scale drivers. The European Center for Medium-Range Weather Forecasts (ECMWF) reanalysis version 5 (ERA5) data for the period 1981–2020 are used. Principal component analysis is also applied to the observed monthly NHD to obtain spatial patterns and time series. The results show that the NHD in the Highland and South subregions from March to May is linked with the subtropical high associated with decreased 500hPa-level vertical velocity (VV500). From May to June, the North and Central subregions seem related to deepening the Asiatic low and enhancement of southwest flows across the Indochina Peninsula. Finally, both increased southwest flows and decreased VV500 can partly contribute to the intensification of NHD in the North and Central subregions during July and August. The long trends of NHD are also examined. The results reveal that the increasing trends in NHD occur in most subregions, except for the Central Highland, and changing trends of NHD in June greatly contribute to the annual trend of NHD. Finally, the examinations with the El Niño-Southern Oscillation events show that NHD is significantly higher in El Niño events than in La Niña events in March and April for the Northwest, South Central, Central Highlands, and South, in May and June for all subregions, and in July and August for only the Red River Delta subregion. This suggests that ENSO can provide the potential for improving seasonal climate forecasts and mitigating natural disaster risks for the community.
越南高温天气时空变化与大尺度大气驱动因素的关系
由于全球变暖和气候变化的影响,越南的严重热浪和高温期在强度和持续时间上更为频繁。炎热的天气和极端的夏季事件使天气变得恶劣,严重影响人类健康和环境。本研究介绍了越南高温日数的时空分布。还结合大规模驱动因素研究了七个气候分区域NHD的可变性。使用欧洲中期天气预报中心(ECMWF)再分析第5版(ERA5)1981年至2020年期间的数据。主成分分析也被应用于观测到的每月NHD,以获得空间模式和时间序列。结果表明,3~5月高地和南部次区域的NHD与500hPa级垂直速度(VV500)下降的副热带高压有关。从5月到6月,北部和中部次区域似乎与加深亚洲低压和增强中南半岛西南气流有关。最后,西南流量的增加和VV500的减少都可能在一定程度上加剧7月和8月期间北部和中部次区域的NHD。还考察了NHD的长期趋势。结果表明,除中部高地外,大多数次区域的NHD呈上升趋势,6月份NHD的变化趋势对NHD的年度趋势有很大贡献。最后,对厄尔尼诺-南方涛动事件的研究表明,西北部、中南部、中部高地和南部的厄尔尼诺事件中的NHD明显高于3月和4月的拉尼娜事件,所有次区域的NHD均高于5月和6月,仅红河三角洲次区域的NDD高于7月和8月。这表明ENSO可以为改善季节性气候预测和减轻社区自然灾害风险提供潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Advances in Meteorology
Advances in Meteorology 地学天文-气象与大气科学
CiteScore
5.30
自引率
3.40%
发文量
80
审稿时长
>12 weeks
期刊介绍: Advances in Meteorology is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of meteorology and climatology. Topics covered include, but are not limited to, forecasting techniques and applications, meteorological modeling, data analysis, atmospheric chemistry and physics, climate change, satellite meteorology, marine meteorology, and forest meteorology.
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