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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Atmospheric blockings in Coupled Model Intercomparison Project Phase 5 models with different representations of Antarctic sea ice extent

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Total Authors: 2
[1] Universidade Federal do Paraná. Setor de Ciências Agrárias - Brasil
[2] Universidade de São Paulo. Instituto de Astronomia - Brasil
Total Affiliations: 2
Document type: Journal article
Source: Anais da Academia Brasileira de Ciências; v. 94, 2022-05-30.

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. (AU)

FAPESP's process: 12/17370-2 - Atmospheric blockings associated with the extreme variability of Antarctic sea ice and impacts in South America
Grantee:Camila Bertoletti Carpenedo
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 17/09659-6 - Interannual variability of the meridional transports across the SAMOC basin-wide array (SAMBAR)
Grantee:Edmo José Dias Campos
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 14/50848-9 - INCT 2014: INCT for Climate Change
Grantee:Jose Antonio Marengo Orsini
Support Opportunities: Research Program on Global Climate Change - Thematic Grants