Definition of springtime easterly wind bursts in the Indian Ocean and their roles in triggering positive IOD events
Using wind reanalysis dataset, we propose a definition for easterly wind bursts (EWBs) occurring in the Indian Ocean and analyze their effects on positive Indian Ocean Dipole (pIOD) events. It was found that there were eight pIOD events during the period from 1980–2020, all of which were accompanied...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | Environmental Research Communications |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2515-7620/ad32db |
| _version_ | 1797255539019743232 |
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| author | Yao Xiao Xiaoxiao Tan Youmin Tang |
| author_facet | Yao Xiao Xiaoxiao Tan Youmin Tang |
| author_sort | Yao Xiao |
| collection | DOAJ |
| description | Using wind reanalysis dataset, we propose a definition for easterly wind bursts (EWBs) occurring in the Indian Ocean and analyze their effects on positive Indian Ocean Dipole (pIOD) events. It was found that there were eight pIOD events during the period from 1980–2020, all of which were accompanied by EWBs occurrence in spring except 2015. The significant impact of EWBs on pIOD events is through the Bjerkness feedback process, strengthening upwelling in the Eastern Indian Ocean (EIO) and triggering a westward zonal current in the equatorial Indian Ocean, both cooling the EIO and in turn strengthening the easterly wind anomalies. Further analysis reveals that the negative upper ocean heat content (OHC) anomalies in EIO, acting as a trigger of Bjerkness feedback process, also plays a critical role in the development of pIOD. Thus, the simultaneous occurrence of EWBs and negative OHC anomalies in spring is an important precursor to pIOD occurrence, although there are possible other triggers. |
| first_indexed | 2024-04-24T22:07:27Z |
| format | Article |
| id | doaj.art-d4b18a78c63e4d0887c4b32e28aed248 |
| institution | Directory Open Access Journal |
| issn | 2515-7620 |
| language | English |
| last_indexed | 2024-04-24T22:07:27Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Communications |
| spelling | doaj.art-d4b18a78c63e4d0887c4b32e28aed2482024-03-20T11:40:07ZengIOP PublishingEnvironmental Research Communications2515-76202024-01-016303100510.1088/2515-7620/ad32dbDefinition of springtime easterly wind bursts in the Indian Ocean and their roles in triggering positive IOD eventsYao Xiao0https://orcid.org/0000-0001-5136-6772Xiaoxiao Tan1Youmin Tang2Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University , Nanjing, People’s Republic of China; College of Oceanography, Hohai University , Nanjing, People’s Republic of ChinaKey Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University , Nanjing, People’s Republic of China; College of Oceanography, Hohai University , Nanjing, People’s Republic of China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, People’s Republic of ChinaCollege of Oceanography, Hohai University , Nanjing, People’s Republic of China; Environmental Science and Engineering, University of North British Columbia , Prince George, CanadaUsing wind reanalysis dataset, we propose a definition for easterly wind bursts (EWBs) occurring in the Indian Ocean and analyze their effects on positive Indian Ocean Dipole (pIOD) events. It was found that there were eight pIOD events during the period from 1980–2020, all of which were accompanied by EWBs occurrence in spring except 2015. The significant impact of EWBs on pIOD events is through the Bjerkness feedback process, strengthening upwelling in the Eastern Indian Ocean (EIO) and triggering a westward zonal current in the equatorial Indian Ocean, both cooling the EIO and in turn strengthening the easterly wind anomalies. Further analysis reveals that the negative upper ocean heat content (OHC) anomalies in EIO, acting as a trigger of Bjerkness feedback process, also plays a critical role in the development of pIOD. Thus, the simultaneous occurrence of EWBs and negative OHC anomalies in spring is an important precursor to pIOD occurrence, although there are possible other triggers.https://doi.org/10.1088/2515-7620/ad32dbIndian Ocean Dipoletropical air-sea interactioneasterly wind burstsocean heat content |
| spellingShingle | Yao Xiao Xiaoxiao Tan Youmin Tang Definition of springtime easterly wind bursts in the Indian Ocean and their roles in triggering positive IOD events Environmental Research Communications Indian Ocean Dipole tropical air-sea interaction easterly wind bursts ocean heat content |
| title | Definition of springtime easterly wind bursts in the Indian Ocean and their roles in triggering positive IOD events |
| title_full | Definition of springtime easterly wind bursts in the Indian Ocean and their roles in triggering positive IOD events |
| title_fullStr | Definition of springtime easterly wind bursts in the Indian Ocean and their roles in triggering positive IOD events |
| title_full_unstemmed | Definition of springtime easterly wind bursts in the Indian Ocean and their roles in triggering positive IOD events |
| title_short | Definition of springtime easterly wind bursts in the Indian Ocean and their roles in triggering positive IOD events |
| title_sort | definition of springtime easterly wind bursts in the indian ocean and their roles in triggering positive iod events |
| topic | Indian Ocean Dipole tropical air-sea interaction easterly wind bursts ocean heat content |
| url | https://doi.org/10.1088/2515-7620/ad32db |
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