Abnormal Strong Upwelling off the Coast of Southeast Vietnam in the Late Summer of 2016: A Comparison with the Case in 1998
The traditional view holds that a weakened upwelling has often been observed off the coast of southeast Vietnam during the post-El Niño summer. This study investigated a strong upwelling and concurrent phytoplankton bloom off the coast of southeast Vietnam in August 2016 by comparing it with another...
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MDPI AG
2020-09-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/11/9/940 |
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| author | Fuan Xiao Zhifeng Wu Yushan Lyu Yicen Zhang |
| author_facet | Fuan Xiao Zhifeng Wu Yushan Lyu Yicen Zhang |
| author_sort | Fuan Xiao |
| collection | DOAJ |
| description | The traditional view holds that a weakened upwelling has often been observed off the coast of southeast Vietnam during the post-El Niño summer. This study investigated a strong upwelling and concurrent phytoplankton bloom off the coast of southeast Vietnam in August 2016 by comparing it with another case in 1998. Analyses of the upwelling structure and formation mechanisms indicated that the abnormal strong upwelling in August 2016 was attributable to strong wind-driven offshore Ekman transport and Ekman pumping, which were caused by the accompanying southwesterly anomalies south of the anomalous cyclone (AC) over the western North Pacific (WNP), and vice versa in August 1998. This anomalous southwesterly wind associated with the AC over the WNP could not be explained by La Niña, the negative Indian ocean dipole, or the positive Pacific meridional mode events. Further analyses showed that the Madden–Julian oscillation (MJO)-induced westerly winds could have contributed more than 75% of the original zonal winds. Nine tropical cyclones generated over the WNP were favorable for excessive precipitation. The opposite configurations of precipitation patterns over the WNP and the Maritime Continent could have further strengthened the AC via a Gill response. |
| first_indexed | 2024-03-10T16:37:02Z |
| format | Article |
| id | doaj.art-96f749ee84154ff593d48101cb4f1a6f |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T16:37:02Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
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| series | Atmosphere |
| spelling | doaj.art-96f749ee84154ff593d48101cb4f1a6f2023-11-20T12:23:49ZengMDPI AGAtmosphere2073-44332020-09-0111994010.3390/atmos11090940Abnormal Strong Upwelling off the Coast of Southeast Vietnam in the Late Summer of 2016: A Comparison with the Case in 1998Fuan Xiao0Zhifeng Wu1Yushan Lyu2Yicen Zhang3School of Geography and Remote Sensing, Guangzhou University, Guangzhou 510006, ChinaSchool of Geography and Remote Sensing, Guangzhou University, Guangzhou 510006, ChinaSchool of Geography and Remote Sensing, Guangzhou University, Guangzhou 510006, ChinaSchool of Geography and Remote Sensing, Guangzhou University, Guangzhou 510006, ChinaThe traditional view holds that a weakened upwelling has often been observed off the coast of southeast Vietnam during the post-El Niño summer. This study investigated a strong upwelling and concurrent phytoplankton bloom off the coast of southeast Vietnam in August 2016 by comparing it with another case in 1998. Analyses of the upwelling structure and formation mechanisms indicated that the abnormal strong upwelling in August 2016 was attributable to strong wind-driven offshore Ekman transport and Ekman pumping, which were caused by the accompanying southwesterly anomalies south of the anomalous cyclone (AC) over the western North Pacific (WNP), and vice versa in August 1998. This anomalous southwesterly wind associated with the AC over the WNP could not be explained by La Niña, the negative Indian ocean dipole, or the positive Pacific meridional mode events. Further analyses showed that the Madden–Julian oscillation (MJO)-induced westerly winds could have contributed more than 75% of the original zonal winds. Nine tropical cyclones generated over the WNP were favorable for excessive precipitation. The opposite configurations of precipitation patterns over the WNP and the Maritime Continent could have further strengthened the AC via a Gill response.https://www.mdpi.com/2073-4433/11/9/940Vietnam upwellinganomalous cycloneMadden–Julian oscillationtropical cyclones |
| spellingShingle | Fuan Xiao Zhifeng Wu Yushan Lyu Yicen Zhang Abnormal Strong Upwelling off the Coast of Southeast Vietnam in the Late Summer of 2016: A Comparison with the Case in 1998 Atmosphere Vietnam upwelling anomalous cyclone Madden–Julian oscillation tropical cyclones |
| title | Abnormal Strong Upwelling off the Coast of Southeast Vietnam in the Late Summer of 2016: A Comparison with the Case in 1998 |
| title_full | Abnormal Strong Upwelling off the Coast of Southeast Vietnam in the Late Summer of 2016: A Comparison with the Case in 1998 |
| title_fullStr | Abnormal Strong Upwelling off the Coast of Southeast Vietnam in the Late Summer of 2016: A Comparison with the Case in 1998 |
| title_full_unstemmed | Abnormal Strong Upwelling off the Coast of Southeast Vietnam in the Late Summer of 2016: A Comparison with the Case in 1998 |
| title_short | Abnormal Strong Upwelling off the Coast of Southeast Vietnam in the Late Summer of 2016: A Comparison with the Case in 1998 |
| title_sort | abnormal strong upwelling off the coast of southeast vietnam in the late summer of 2016 a comparison with the case in 1998 |
| topic | Vietnam upwelling anomalous cyclone Madden–Julian oscillation tropical cyclones |
| url | https://www.mdpi.com/2073-4433/11/9/940 |
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