Atmospheric blockings in Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent
Abstract This study investigated whether there are differences in the frequency and position of Southern Hemisphere atmospheric blockings between Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent in historical experiments. In the model wi...
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| Format: | Article |
| Language: | English |
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Academia Brasileira de Ciências
2022-05-01
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| Series: | Anais da Academia Brasileira de Ciências |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652022000201120&lng=en&tlng=en |
| _version_ | 1828336818112692224 |
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| author | CAMILA B. CARPENEDO TÉRCIO AMBRIZZI |
| author_facet | CAMILA B. CARPENEDO TÉRCIO AMBRIZZI |
| author_sort | CAMILA B. CARPENEDO |
| collection | DOAJ |
| description | Abstract This study investigated whether there are differences in the frequency and position of Southern Hemisphere atmospheric blockings between Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent in historical experiments. In the model with the greatest sea ice underestimation (Model for Interdisciplinary Research on Climate version 5) there is a weakening of the polar jet and an increase in 500-hPa height. These atmospheric conditions favor the predomination of simulated blocking frequency overestimations (autumn-winter), in relation to the observed (ERA-Interim). On the other hand, in the models with the greatest sea ice overestimations (Community Climate System Model version 4) and the better sea ice representation (Norwegian Earth System Model version 1) there is a strengthening of the polar jet and weaker positive differences in 500-hPa height in the Antarctic region. These atmospheric conditions favor a predominance of simulated blocking frequency underestimations (all seasons). All models present a good representation of the preferred blocking regions (South Pacific), although they do not represent the longitudinal location of the maximum frequency. In years of sea ice retraction (expansion), there is a predominance of a higher (lower) blocking frequency in the 60°S for all models and observed data. |
| first_indexed | 2024-04-13T22:06:29Z |
| format | Article |
| id | doaj.art-9a2095c334764e49a122fe30d1958ace |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-04-13T22:06:29Z |
| publishDate | 2022-05-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-9a2095c334764e49a122fe30d1958ace2022-12-22T02:27:56ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902022-05-0194suppl 110.1590/0001-3765202220210432Atmospheric blockings in Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extentCAMILA B. CARPENEDOhttps://orcid.org/0000-0001-9034-789XTÉRCIO AMBRIZZIhttps://orcid.org/0000-0001-8796-7326Abstract This study investigated whether there are differences in the frequency and position of Southern Hemisphere atmospheric blockings between Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent in historical experiments. In the model with the greatest sea ice underestimation (Model for Interdisciplinary Research on Climate version 5) there is a weakening of the polar jet and an increase in 500-hPa height. These atmospheric conditions favor the predomination of simulated blocking frequency overestimations (autumn-winter), in relation to the observed (ERA-Interim). On the other hand, in the models with the greatest sea ice overestimations (Community Climate System Model version 4) and the better sea ice representation (Norwegian Earth System Model version 1) there is a strengthening of the polar jet and weaker positive differences in 500-hPa height in the Antarctic region. These atmospheric conditions favor a predominance of simulated blocking frequency underestimations (all seasons). All models present a good representation of the preferred blocking regions (South Pacific), although they do not represent the longitudinal location of the maximum frequency. In years of sea ice retraction (expansion), there is a predominance of a higher (lower) blocking frequency in the 60°S for all models and observed data.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652022000201120&lng=en&tlng=enAtmospheric blockingssea iceCMIP5Antarctica |
| spellingShingle | CAMILA B. CARPENEDO TÉRCIO AMBRIZZI Atmospheric blockings in Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent Anais da Academia Brasileira de Ciências Atmospheric blockings sea ice CMIP5 Antarctica |
| title | Atmospheric blockings in Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent |
| title_full | Atmospheric blockings in Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent |
| title_fullStr | Atmospheric blockings in Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent |
| title_full_unstemmed | Atmospheric blockings in Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent |
| title_short | Atmospheric blockings in Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent |
| title_sort | atmospheric blockings in coupled model intercomparison project phase 5 models with different representations of antarctic sea ice extent |
| topic | Atmospheric blockings sea ice CMIP5 Antarctica |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652022000201120&lng=en&tlng=en |
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