Orographic Effect and the Opposite Trend of Rainfall in Central Vietnam
Central Vietnam is characterized by severe flooding associated with heavy rainfall events caused by interactions between multiscale atmospheric circulations and the complex local terrain. Previous studies believed rainfall in central Vietnam is closely related to the cold surge; however, it fails to...
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| Main Authors: | , , , , , , , , , , , |
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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/10.1155/2023/7256634 |
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| author | Thang Nguyen Van Mau Nguyen Dang Van Doan Quang Tuan Bui Minh Khiem Mai Van Kham Duong Van Thuy Tran Thanh Duong Trinh Hoang Tam Tran Thi Quyen Nguyen Huu Thai Luong Xuan Hien Tran Duy |
| author_facet | Thang Nguyen Van Mau Nguyen Dang Van Doan Quang Tuan Bui Minh Khiem Mai Van Kham Duong Van Thuy Tran Thanh Duong Trinh Hoang Tam Tran Thi Quyen Nguyen Huu Thai Luong Xuan Hien Tran Duy |
| author_sort | Thang Nguyen Van |
| collection | DOAJ |
| description | Central Vietnam is characterized by severe flooding associated with heavy rainfall events caused by interactions between multiscale atmospheric circulations and the complex local terrain. Previous studies believed rainfall in central Vietnam is closely related to the cold surge; however, it fails to explain the cause of the early rainfall occurrence in August in the subregion. For the first time, this study investigates the detailed atmospheric mechanisms associated with rainfall variations in central Vietnam using the empirical orthogonal function (EOF) applied to the recently developed high-resolution Vietnam gridded precipitation (VnGP) dataset. Reanalysis data NCEP/NCAR is used to associate the rainfall changes with respective atmospheric mechanisms. EOF analysis detected two dominant rainfall modes. The primary mode explains the rainfall variation from October to November over the central and is directly related to the interaction of cold surges and tropical disturbances. The second mode accounts for rainfall occurring in north central from September to mid-October, which is attributed to the westerly summer monsoon activities. Also, we revealed that, while the first mode exhibits a significant correlation with El Niño-southern oscillation, the second depends highly on the contrast of sea surface temperature in the northern and southern Hemispheres. This different oceanic forcing and the local topological effect of Truong Son mountain range reasonably explain the opposite rainfall pattern in central Vietnam in early fall. |
| format | Article |
| id | doaj-art-e1bc6ba4cb5d4baa9f6c1f4b16939688 |
| institution | Kabale University |
| issn | 1687-9317 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Meteorology |
| spelling | doaj-art-e1bc6ba4cb5d4baa9f6c1f4b169396882025-02-03T01:30:44ZengWileyAdvances in Meteorology1687-93172023-01-01202310.1155/2023/7256634Orographic Effect and the Opposite Trend of Rainfall in Central VietnamThang Nguyen Van0Mau Nguyen Dang1Van Doan Quang2Tuan Bui Minh3Khiem Mai Van4Kham Duong Van5Thuy Tran Thanh6Duong Trinh Hoang7Tam Tran Thi8Quyen Nguyen Huu9Thai Luong Xuan10Hien Tran Duy11Vietnam Institute of MeteorologyVietnam Institute of MeteorologyCenter for Computational ScienceVNU Universtity of ScienceNational Center for Hydro-Meteorological ForecastingVietnam Institute of MeteorologyVietnam Institute of MeteorologyVietnam Institute of MeteorologyVietnam Institute of MeteorologyVietnam Institute of MeteorologyHydrometeorological Monitoring CenterDepartment of Science and TechnologyCentral Vietnam is characterized by severe flooding associated with heavy rainfall events caused by interactions between multiscale atmospheric circulations and the complex local terrain. Previous studies believed rainfall in central Vietnam is closely related to the cold surge; however, it fails to explain the cause of the early rainfall occurrence in August in the subregion. For the first time, this study investigates the detailed atmospheric mechanisms associated with rainfall variations in central Vietnam using the empirical orthogonal function (EOF) applied to the recently developed high-resolution Vietnam gridded precipitation (VnGP) dataset. Reanalysis data NCEP/NCAR is used to associate the rainfall changes with respective atmospheric mechanisms. EOF analysis detected two dominant rainfall modes. The primary mode explains the rainfall variation from October to November over the central and is directly related to the interaction of cold surges and tropical disturbances. The second mode accounts for rainfall occurring in north central from September to mid-October, which is attributed to the westerly summer monsoon activities. Also, we revealed that, while the first mode exhibits a significant correlation with El Niño-southern oscillation, the second depends highly on the contrast of sea surface temperature in the northern and southern Hemispheres. This different oceanic forcing and the local topological effect of Truong Son mountain range reasonably explain the opposite rainfall pattern in central Vietnam in early fall.http://dx.doi.org/10.1155/2023/7256634 |
| spellingShingle | Thang Nguyen Van Mau Nguyen Dang Van Doan Quang Tuan Bui Minh Khiem Mai Van Kham Duong Van Thuy Tran Thanh Duong Trinh Hoang Tam Tran Thi Quyen Nguyen Huu Thai Luong Xuan Hien Tran Duy Orographic Effect and the Opposite Trend of Rainfall in Central Vietnam Advances in Meteorology |
| title | Orographic Effect and the Opposite Trend of Rainfall in Central Vietnam |
| title_full | Orographic Effect and the Opposite Trend of Rainfall in Central Vietnam |
| title_fullStr | Orographic Effect and the Opposite Trend of Rainfall in Central Vietnam |
| title_full_unstemmed | Orographic Effect and the Opposite Trend of Rainfall in Central Vietnam |
| title_short | Orographic Effect and the Opposite Trend of Rainfall in Central Vietnam |
| title_sort | orographic effect and the opposite trend of rainfall in central vietnam |
| url | http://dx.doi.org/10.1155/2023/7256634 |
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