The poleward shift of South Atlantic Convergence Zone in recent decades
During austral summer (December–January–February or DJF), intense precipitation over central-eastern Brazil is modulated by the South American Monsoon System and the South Atlantic Convergence Zone (SACZ). Previous studies identified spatial variability in precipitation trends over this region, sugg...
| Príomhchruthaitheoirí: | , , |
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| Formáid: | Journal article |
| Teanga: | English |
| Foilsithe / Cruthaithe: |
Springer
2018
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| _version_ | 1826266169902891008 |
|---|---|
| author | Zilli, MT Carvalho, LMV Lintner, BR |
| author_facet | Zilli, MT Carvalho, LMV Lintner, BR |
| author_sort | Zilli, MT |
| collection | OXFORD |
| description | During austral summer (December–January–February or DJF), intense precipitation over central-eastern Brazil is modulated by the South American Monsoon System and the South Atlantic Convergence Zone (SACZ). Previous studies identified spatial variability in precipitation trends over this region, suggestive of a poleward shift of the SACZ in recent years. To identify underlying mechanisms associated with changes in the precipitation intensity and position of the SACZ, decadal averages of observed precipitation and the mean state of the atmosphere and ocean during three different periods from 1979 to 2014 are compared. Results show evidence of decreasing (increasing) average daily precipitation along the equatorward (poleward) margin of the climatological SACZ, likely related to a poleward shift of the convergence zone. Precipitation reduction along the equatorward margin of the SACZ is associated with weakening of the poleward winds along the eastern Brazilian coast and drying of low-to-mid troposphere (700 hPa) over the tropical Atlantic. These changes in circulation and moisture are likely related to the poleward expansion of the South Atlantic Subtropical High. |
| first_indexed | 2024-03-06T20:34:51Z |
| format | Journal article |
| id | oxford-uuid:324a03cb-d65a-4a92-90b5-4d51422e7adc |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:34:51Z |
| publishDate | 2018 |
| publisher | Springer |
| record_format | dspace |
| spelling | oxford-uuid:324a03cb-d65a-4a92-90b5-4d51422e7adc2022-03-26T13:13:02ZThe poleward shift of South Atlantic Convergence Zone in recent decadesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:324a03cb-d65a-4a92-90b5-4d51422e7adcEnglishSymplectic ElementsSpringer2018Zilli, MTCarvalho, LMVLintner, BRDuring austral summer (December–January–February or DJF), intense precipitation over central-eastern Brazil is modulated by the South American Monsoon System and the South Atlantic Convergence Zone (SACZ). Previous studies identified spatial variability in precipitation trends over this region, suggestive of a poleward shift of the SACZ in recent years. To identify underlying mechanisms associated with changes in the precipitation intensity and position of the SACZ, decadal averages of observed precipitation and the mean state of the atmosphere and ocean during three different periods from 1979 to 2014 are compared. Results show evidence of decreasing (increasing) average daily precipitation along the equatorward (poleward) margin of the climatological SACZ, likely related to a poleward shift of the convergence zone. Precipitation reduction along the equatorward margin of the SACZ is associated with weakening of the poleward winds along the eastern Brazilian coast and drying of low-to-mid troposphere (700 hPa) over the tropical Atlantic. These changes in circulation and moisture are likely related to the poleward expansion of the South Atlantic Subtropical High. |
| spellingShingle | Zilli, MT Carvalho, LMV Lintner, BR The poleward shift of South Atlantic Convergence Zone in recent decades |
| title | The poleward shift of South Atlantic Convergence Zone in recent decades |
| title_full | The poleward shift of South Atlantic Convergence Zone in recent decades |
| title_fullStr | The poleward shift of South Atlantic Convergence Zone in recent decades |
| title_full_unstemmed | The poleward shift of South Atlantic Convergence Zone in recent decades |
| title_short | The poleward shift of South Atlantic Convergence Zone in recent decades |
| title_sort | poleward shift of south atlantic convergence zone in recent decades |
| work_keys_str_mv | AT zillimt thepolewardshiftofsouthatlanticconvergencezoneinrecentdecades AT carvalholmv thepolewardshiftofsouthatlanticconvergencezoneinrecentdecades AT lintnerbr thepolewardshiftofsouthatlanticconvergencezoneinrecentdecades AT zillimt polewardshiftofsouthatlanticconvergencezoneinrecentdecades AT carvalholmv polewardshiftofsouthatlanticconvergencezoneinrecentdecades AT lintnerbr polewardshiftofsouthatlanticconvergencezoneinrecentdecades |