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The role of the meridional sea surface temperature gradient in controlling the Caribbean low‐level jet

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Type de ressource
Article de revue
Auteurs/contributeurs
  • Maldonado, Tito (Auteur)
  • Rutgersson, Anna (Auteur)
  • Caballero, Rodrigo (Auteur)
  • Pausata, Francesco S. R. (Auteur)
  • Alfaro, Eric (Auteur)
  • Amador, Jorge (Auteur)
Titre
The role of the meridional sea surface temperature gradient in controlling the Caribbean low‐level jet
Résumé
Abstract The Caribbean low‐level jet (CLLJ) is an important modulator of regional climate, especially precipitation, in the Caribbean and Central America. Previous work has inferred, due to their semiannual cycle, an association between CLLJ strength and meridional sea surface temperature (SST) gradients in the Caribbean Sea, suggesting that the SST gradients may control the intensity and vertical shear of the CLLJ. In addition, both the horizontal and vertical structure of the jet have been related to topographic effects via interaction with the mountains in Northern South America (NSA), including funneling effects and changes in the meridional geopotential gradient. Here we test these hypotheses, using an atmospheric general circulation model to perform a set of sensitivity experiments to examine the impact of both SST gradients and topography on the CLLJ. In one sensitivity experiment, we remove the meridional SST gradient over the Caribbean Sea and in the other, we flatten the mountains over NSA. Our results show that the SST gradient and topography have little or no impact on the jet intensity, vertical, and horizontal wind shears, contrary to previous works. However, our findings do not discount a possible one‐way coupling between the SST and the wind over the Caribbean Sea through friction force. We also examined an alternative approach based on barotropic instability to understand the CLLJ intensity, vertical, and horizontal wind shears. Our results show that the current hypothesis about the CLLJ must be reviewed in order to fully understand the atmospheric dynamics governing the Caribbean region. , Key Points Atmospheric dynamics in the Caribbean SST over the Caribbean Sea is examined as kinetic energy source for the CLLJ Impact of meridional SST gradient on the vertical structure of CLLJ
Publication
Journal of Geophysical Research: Atmospheres
Volume
122
Numéro
11
Pages
5903-5916
Date
2017-06-16
Abrév. de revue
JGR Atmospheres
Langue
en
DOI
10.1002/2016JD026025
ISSN
2169-897X, 2169-8996
URL
https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2016JD026025
Consulté le
07/11/2024 19:16
Catalogue de bibl.
DOI.org (Crossref)
Autorisations
http://onlinelibrary.wiley.com/termsAndConditions#vor
Référence
Maldonado, T., Rutgersson, A., Caballero, R., Pausata, F. S. R., Alfaro, E., & Amador, J. (2017). The role of the meridional sea surface temperature gradient in controlling the Caribbean low‐level jet. Journal of Geophysical Research: Atmospheres, 122(11), 5903–5916. https://doi.org/10.1002/2016JD026025
Auteur·e·s
  • Pausata, Francesco S.R.
Document
  • Maldonado et al. - 2017 - The role of the meridional sea surface temperature gradient in controlling the Caribbean low‐level j.pdf
Lien vers cette notice
https://bibliographies.uqam.ca/escer/bibliographie/UKYLV4RB
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