Spatiotemporal Variability of Hot Days in Association with the Large-Scale Atmospheric Drivers over Vietnam
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 sp...
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| Format: | Article |
| Language: | English |
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Wiley
2023-01-01
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| Series: | Advances in Meteorology |
| Online Access: | http://dx.doi.org/10.1155/2023/6612199 |
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| author | Chinh Ta Huu Tan Phan Van Khiem Mai Van Thang Vu Van Lam Hoang Phuc Worapong Lohpaisankrit Quoc Bao Pham Trinh Trong Nguyen Phong Nguyen Thanh |
| author_facet | Chinh Ta Huu Tan Phan Van Khiem Mai Van Thang Vu Van Lam Hoang Phuc Worapong Lohpaisankrit Quoc Bao Pham Trinh Trong Nguyen Phong Nguyen Thanh |
| author_sort | Chinh Ta Huu |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-d02d4ef0ba274b77a5b19fcf0652b477 |
| institution | Kabale University |
| issn | 1687-9317 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Meteorology |
| spelling | doaj-art-d02d4ef0ba274b77a5b19fcf0652b4772025-02-03T05:48:40ZengWileyAdvances in Meteorology1687-93172023-01-01202310.1155/2023/6612199Spatiotemporal Variability of Hot Days in Association with the Large-Scale Atmospheric Drivers over VietnamChinh Ta Huu0Tan Phan Van1Khiem Mai Van2Thang Vu Van3Lam Hoang Phuc4Worapong Lohpaisankrit5Quoc Bao Pham6Trinh Trong Nguyen7Phong Nguyen Thanh8Vietnam Institute of Meteorology Hydrology and Climate ChangeDepartment of Meteorology and Climate ChangeVietnam National Center for Hydrology Meteorology ForecastingVietnam Institute of Meteorology Hydrology and Climate ChangeVietnam National Center for Hydrology Meteorology ForecastingDepartment of Civil EngineeringFaculty of Natural SciencesHUTECH UniversityLaboratory of Environmental Sciences and Climate ChangeThe 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.http://dx.doi.org/10.1155/2023/6612199 |
| spellingShingle | Chinh Ta Huu Tan Phan Van Khiem Mai Van Thang Vu Van Lam Hoang Phuc Worapong Lohpaisankrit Quoc Bao Pham Trinh Trong Nguyen Phong Nguyen Thanh Spatiotemporal Variability of Hot Days in Association with the Large-Scale Atmospheric Drivers over Vietnam Advances in Meteorology |
| title | Spatiotemporal Variability of Hot Days in Association with the Large-Scale Atmospheric Drivers over Vietnam |
| title_full | Spatiotemporal Variability of Hot Days in Association with the Large-Scale Atmospheric Drivers over Vietnam |
| title_fullStr | Spatiotemporal Variability of Hot Days in Association with the Large-Scale Atmospheric Drivers over Vietnam |
| title_full_unstemmed | Spatiotemporal Variability of Hot Days in Association with the Large-Scale Atmospheric Drivers over Vietnam |
| title_short | Spatiotemporal Variability of Hot Days in Association with the Large-Scale Atmospheric Drivers over Vietnam |
| title_sort | spatiotemporal variability of hot days in association with the large scale atmospheric drivers over vietnam |
| url | http://dx.doi.org/10.1155/2023/6612199 |
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