Atmospheric circulation patterns associated with surface air temperature variability trends between the Antarctic Peninsula and South America
Abstract This study investigated the spatial patterns of atmospheric circulation associated with surface air temperature variability trends between the Antarctic Peninsula and South America, during the austral summer (1979-2020). The first mode shows a positive score trend, with warming in northern...
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Academia Brasileira de Ciências
2023-11-01
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| Series: | Anais da Academia Brasileira de Ciências |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601106&tlng=en |
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| author | CAMILA B. CARPENEDO DENILSON R. VIANA CLÁUDIA K. PARISE FRANCISCO E. AQUINO RICARDO B. BRAGA |
| author_facet | CAMILA B. CARPENEDO DENILSON R. VIANA CLÁUDIA K. PARISE FRANCISCO E. AQUINO RICARDO B. BRAGA |
| author_sort | CAMILA B. CARPENEDO |
| collection | DOAJ |
| description | Abstract This study investigated the spatial patterns of atmospheric circulation associated with surface air temperature variability trends between the Antarctic Peninsula and South America, during the austral summer (1979-2020). The first mode shows a positive score trend, with warming in northern Antarctic Peninsula and southern South America. This mode is mainly associated with the positive/neutral Southern Annular Mode and La Niña phases. There is an anomalous low pressure in the Southeast Pacific, a strengthening (weakening) of the polar (subtropical) jet and a strengthening and/or south/southwest displacement of the South Atlantic Subtropical High, which can prevent the passage of transient systems over the continent. In addition, there is a negative phase pattern of the South Atlantic Dipole, which contributes to the strengthening of the South Atlantic Convergence Zone convective activity. The second mode shows a negative score trend, with cooling in the Antarctic Peninsula/southernmost South America and warming between 10-40°S over South America. This mode is mainly associated with the spatial pattern of Central Pacific El Niño. There is a strengthening of the low-level jet and a strengthening of the western branch of the South Atlantic Subtropical High, all of which contribute to the suppression of the South Atlantic Convergence Zone. |
| first_indexed | 2024-03-11T12:16:30Z |
| format | Article |
| id | doaj.art-34d251d8662a442b8d07102de3029a71 |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-03-11T12:16:30Z |
| publishDate | 2023-11-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-34d251d8662a442b8d07102de3029a712023-11-07T07:46:24ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902023-11-0195suppl 310.1590/0001-3765202320220591Atmospheric circulation patterns associated with surface air temperature variability trends between the Antarctic Peninsula and South AmericaCAMILA B. CARPENEDOhttps://orcid.org/0000-0001-9034-789XDENILSON R. VIANAhttps://orcid.org/0000-0002-4142-0189CLÁUDIA K. PARISEhttps://orcid.org/0000-0002-9466-788XFRANCISCO E. AQUINOhttps://orcid.org/0000-0003-2993-1100RICARDO B. BRAGAhttps://orcid.org/0000-0002-8696-8199Abstract This study investigated the spatial patterns of atmospheric circulation associated with surface air temperature variability trends between the Antarctic Peninsula and South America, during the austral summer (1979-2020). The first mode shows a positive score trend, with warming in northern Antarctic Peninsula and southern South America. This mode is mainly associated with the positive/neutral Southern Annular Mode and La Niña phases. There is an anomalous low pressure in the Southeast Pacific, a strengthening (weakening) of the polar (subtropical) jet and a strengthening and/or south/southwest displacement of the South Atlantic Subtropical High, which can prevent the passage of transient systems over the continent. In addition, there is a negative phase pattern of the South Atlantic Dipole, which contributes to the strengthening of the South Atlantic Convergence Zone convective activity. The second mode shows a negative score trend, with cooling in the Antarctic Peninsula/southernmost South America and warming between 10-40°S over South America. This mode is mainly associated with the spatial pattern of Central Pacific El Niño. There is a strengthening of the low-level jet and a strengthening of the western branch of the South Atlantic Subtropical High, all of which contribute to the suppression of the South Atlantic Convergence Zone.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601106&tlng=enClimateSAMENSOSACZ |
| spellingShingle | CAMILA B. CARPENEDO DENILSON R. VIANA CLÁUDIA K. PARISE FRANCISCO E. AQUINO RICARDO B. BRAGA Atmospheric circulation patterns associated with surface air temperature variability trends between the Antarctic Peninsula and South America Anais da Academia Brasileira de Ciências Climate SAM ENSO SACZ |
| title | Atmospheric circulation patterns associated with surface air temperature variability trends between the Antarctic Peninsula and South America |
| title_full | Atmospheric circulation patterns associated with surface air temperature variability trends between the Antarctic Peninsula and South America |
| title_fullStr | Atmospheric circulation patterns associated with surface air temperature variability trends between the Antarctic Peninsula and South America |
| title_full_unstemmed | Atmospheric circulation patterns associated with surface air temperature variability trends between the Antarctic Peninsula and South America |
| title_short | Atmospheric circulation patterns associated with surface air temperature variability trends between the Antarctic Peninsula and South America |
| title_sort | atmospheric circulation patterns associated with surface air temperature variability trends between the antarctic peninsula and south america |
| topic | Climate SAM ENSO SACZ |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601106&tlng=en |
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