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The role of the mer...
The role of the meridional sea surface temperature gradient in controlling the Caribbean low-level jet
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- Maldonado, Tito (författare)
- Uppsala universitet,Luft-, vatten- och landskapslära,Univ Costa Rica, Ctr Geophys Res CIGEFI, San Pedro, Costa Rica,AWEP
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- Rutgersson, Anna, 1971- (författare)
- Uppsala universitet,Luft-, vatten- och landskapslära,AWEP
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- Caballero, Rodrigo (författare)
- Stockholms universitet,Meteorologiska institutionen (MISU),Stockholm Univ, Dept Meteorol, Stockholm, Sweden.; Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden
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- Pausata, Francesco S. R. (författare)
- Stockholms universitet,Meteorologiska institutionen (MISU),University of Quebec in Montreal, Canada,Stockholm Univ, Dept Meteorol, Stockholm, Sweden.; Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden.; Univ Quebec Montreal, Dept Earth & Atmospher Sci, Montreal, PQ, Canada
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- Alfaro, Eric (författare)
- Univ Costa Rica, Ctr Geophys Res CIGEFI, San Pedro, Costa Rica.; Univ Costa Rica, Ctr Res Marine Sci & Limnol CIMAR, San Pedro, Costa Rica.; Univ Costa Rica, Sch Phys, San Pedro, Costa Rica
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- Amador, Jorge (författare)
- Univ Costa Rica, Ctr Geophys Res CIGEFI, San Pedro, Costa Rica.; Univ Costa Rica, Sch Phys, San Pedro, Costa Rica
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(creator_code:org_t)
- 2017
- 2017
- Engelska.
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Ingår i: Journal of Geophysical Research - Atmospheres. - 2169-897X .- 2169-8996. ; 122:11, s. 5903-5916
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
Nyckelord
- SST gradient
- Caribbean Sea
- Caribbean low-level jet
- Central America
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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