A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades
<p>We utilized the global atmospheric reanalysis ERA5 and reconstructed sea surface temperature (SST) data from 1979 through 2020 to examine the stability of the relationship between the SST oscillations in the southern Indian Ocean and the Atlantic Ocean, as described by the Subtropical India...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-01-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/23/345/2023/acp-23-345-2023.pdf |
| _version_ | 1828068108403736576 |
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| author | L. Yu S. Zhong T. Vihma C. Sui B. Sun |
| author_facet | L. Yu S. Zhong T. Vihma C. Sui B. Sun |
| author_sort | L. Yu |
| collection | DOAJ |
| description | <p>We utilized the global atmospheric reanalysis ERA5 and reconstructed sea
surface temperature (SST) data from 1979 through 2020 to examine the
stability of the relationship between the SST oscillations in the southern
Indian Ocean and the Atlantic Ocean, as described by the Subtropical Indian Ocean Dipole (SIOD) and South Atlantic Ocean Dipole (SAOD) indices, respectively. We note a significant positive correlation between the two indices prior to the year 2000 but practically no correlation afterwards. We show that in the two decades prior to 2000, a positive phase of the SAOD is associated with more convective activities over the subtropical southern Atlantic Ocean and eastern Brazil, which trigger a stronger upper-atmosphere wavetrain. This produces stronger southern subtropical highs and surface anti-cyclonic circulations and therefore a stronger correlation between the two indices. The situation is reversed after 2000. Our results are potentially applicable to predictions of precipitation in southern Africa and South America.</p> |
| first_indexed | 2024-04-10T23:56:41Z |
| format | Article |
| id | doaj.art-5eaaeca73de84556b073b61d19b7ea77 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-10T23:56:41Z |
| publishDate | 2023-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-5eaaeca73de84556b073b61d19b7ea772023-01-10T11:02:06ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242023-01-012334535310.5194/acp-23-345-2023A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decadesL. Yu0S. Zhong1T. Vihma2C. Sui3B. Sun4MNR Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, ChinaDepartment of Geography, Environment and Spatial Sciences, Michigan State University, East Lansing, MI, USAFinnish Meteorological Institute, Helsinki, FinlandNational Marine Environmental Forecasting Center, Beijing, ChinaMNR Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, China<p>We utilized the global atmospheric reanalysis ERA5 and reconstructed sea surface temperature (SST) data from 1979 through 2020 to examine the stability of the relationship between the SST oscillations in the southern Indian Ocean and the Atlantic Ocean, as described by the Subtropical Indian Ocean Dipole (SIOD) and South Atlantic Ocean Dipole (SAOD) indices, respectively. We note a significant positive correlation between the two indices prior to the year 2000 but practically no correlation afterwards. We show that in the two decades prior to 2000, a positive phase of the SAOD is associated with more convective activities over the subtropical southern Atlantic Ocean and eastern Brazil, which trigger a stronger upper-atmosphere wavetrain. This produces stronger southern subtropical highs and surface anti-cyclonic circulations and therefore a stronger correlation between the two indices. The situation is reversed after 2000. Our results are potentially applicable to predictions of precipitation in southern Africa and South America.</p>https://acp.copernicus.org/articles/23/345/2023/acp-23-345-2023.pdf |
| spellingShingle | L. Yu S. Zhong T. Vihma C. Sui B. Sun A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades Atmospheric Chemistry and Physics |
| title | A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades |
| title_full | A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades |
| title_fullStr | A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades |
| title_full_unstemmed | A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades |
| title_short | A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades |
| title_sort | change in the relation between the subtropical indian ocean dipole and the south atlantic ocean dipole indices in the past four decades |
| url | https://acp.copernicus.org/articles/23/345/2023/acp-23-345-2023.pdf |
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