Air-sea heat fluxes associated to mesoscale eddies in the Southwestern Atlantic Ocean and their dependence on different regional conditions
Heat fluxes between the ocean and the atmosphere largely represent the link between the two media. A possible mechanism of interaction is generated by mesoscale ocean eddies. In this work we evaluate if eddies in Southwestern Atlantic (SWA) Ocean may significantly affect flows between the ocean and...
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2017
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paper:paper_09307575_v49_n7-8_p2491_Leyba2023-06-08T15:52:48Z Air-sea heat fluxes associated to mesoscale eddies in the Southwestern Atlantic Ocean and their dependence on different regional conditions Saraceno, Martin Solman, Silvina Alicia Heat flux Mesoscale eddies South Atlantic air-sea interaction heat flow latent heat flux mesoscale eddy sea surface temperature sensible heat flux turbulence Atlantic Ocean Atlantic Ocean (Southwest) Calluna vulgaris Heat fluxes between the ocean and the atmosphere largely represent the link between the two media. A possible mechanism of interaction is generated by mesoscale ocean eddies. In this work we evaluate if eddies in Southwestern Atlantic (SWA) Ocean may significantly affect flows between the ocean and the atmosphere. Atmospherics conditions associated with eddies were examined using data of sea surface temperature (SST), sensible (SHF) and latent heat flux (LHF) from NCEP–CFSR reanalysis. On average, we found that NCEP–CFSR reanalysis adequately reflects the variability expected from eddies in the SWA, considering the classical eddy-pumping theory: anticyclonic (cyclonic) eddies cause maximum positive (negative) anomalies with maximum mean anomalies of 0.5 °C (−0.5 °C) in SST, 6 W/m2 (−4 W/m2) in SHF and 12 W/m2 (−9 W/m2) in LHF. However, a regional dependence of heat fluxes associated to mesoscale cyclonic eddies was found: in the turbulent Brazil–Malvinas Confluence (BMC) region they are related with positive heat flux anomaly (ocean heat loss), while in the rest of the SWA they behave as expected (ocean heat gain). We argue that eddy-pumping do not cool enough the center of the cyclonic eddies in the BMC region simply because most of them trapped very warm waters when they originate in the subtropics. The article therefore concludes that in the SWA: (1) a robust link exists between the SST anomalies generated by eddies and the local anomalous heat flow between the ocean and the atmosphere; (2) in the BMC region cyclonic eddies are related with positive heat anomalies, contrary to what is expected. © 2016, Springer-Verlag Berlin Heidelberg. Fil:Saraceno, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Solman, S.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v49_n7-8_p2491_Leyba http://hdl.handle.net/20.500.12110/paper_09307575_v49_n7-8_p2491_Leyba |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Heat flux Mesoscale eddies South Atlantic air-sea interaction heat flow latent heat flux mesoscale eddy sea surface temperature sensible heat flux turbulence Atlantic Ocean Atlantic Ocean (Southwest) Calluna vulgaris |
| spellingShingle |
Heat flux Mesoscale eddies South Atlantic air-sea interaction heat flow latent heat flux mesoscale eddy sea surface temperature sensible heat flux turbulence Atlantic Ocean Atlantic Ocean (Southwest) Calluna vulgaris Saraceno, Martin Solman, Silvina Alicia Air-sea heat fluxes associated to mesoscale eddies in the Southwestern Atlantic Ocean and their dependence on different regional conditions |
| topic_facet |
Heat flux Mesoscale eddies South Atlantic air-sea interaction heat flow latent heat flux mesoscale eddy sea surface temperature sensible heat flux turbulence Atlantic Ocean Atlantic Ocean (Southwest) Calluna vulgaris |
| description |
Heat fluxes between the ocean and the atmosphere largely represent the link between the two media. A possible mechanism of interaction is generated by mesoscale ocean eddies. In this work we evaluate if eddies in Southwestern Atlantic (SWA) Ocean may significantly affect flows between the ocean and the atmosphere. Atmospherics conditions associated with eddies were examined using data of sea surface temperature (SST), sensible (SHF) and latent heat flux (LHF) from NCEP–CFSR reanalysis. On average, we found that NCEP–CFSR reanalysis adequately reflects the variability expected from eddies in the SWA, considering the classical eddy-pumping theory: anticyclonic (cyclonic) eddies cause maximum positive (negative) anomalies with maximum mean anomalies of 0.5 °C (−0.5 °C) in SST, 6 W/m2 (−4 W/m2) in SHF and 12 W/m2 (−9 W/m2) in LHF. However, a regional dependence of heat fluxes associated to mesoscale cyclonic eddies was found: in the turbulent Brazil–Malvinas Confluence (BMC) region they are related with positive heat flux anomaly (ocean heat loss), while in the rest of the SWA they behave as expected (ocean heat gain). We argue that eddy-pumping do not cool enough the center of the cyclonic eddies in the BMC region simply because most of them trapped very warm waters when they originate in the subtropics. The article therefore concludes that in the SWA: (1) a robust link exists between the SST anomalies generated by eddies and the local anomalous heat flow between the ocean and the atmosphere; (2) in the BMC region cyclonic eddies are related with positive heat anomalies, contrary to what is expected. © 2016, Springer-Verlag Berlin Heidelberg. |
| author |
Saraceno, Martin Solman, Silvina Alicia |
| author_facet |
Saraceno, Martin Solman, Silvina Alicia |
| author_sort |
Saraceno, Martin |
| title |
Air-sea heat fluxes associated to mesoscale eddies in the Southwestern Atlantic Ocean and their dependence on different regional conditions |
| title_short |
Air-sea heat fluxes associated to mesoscale eddies in the Southwestern Atlantic Ocean and their dependence on different regional conditions |
| title_full |
Air-sea heat fluxes associated to mesoscale eddies in the Southwestern Atlantic Ocean and their dependence on different regional conditions |
| title_fullStr |
Air-sea heat fluxes associated to mesoscale eddies in the Southwestern Atlantic Ocean and their dependence on different regional conditions |
| title_full_unstemmed |
Air-sea heat fluxes associated to mesoscale eddies in the Southwestern Atlantic Ocean and their dependence on different regional conditions |
| title_sort |
air-sea heat fluxes associated to mesoscale eddies in the southwestern atlantic ocean and their dependence on different regional conditions |
| publishDate |
2017 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09307575_v49_n7-8_p2491_Leyba http://hdl.handle.net/20.500.12110/paper_09307575_v49_n7-8_p2491_Leyba |
| work_keys_str_mv |
AT saracenomartin airseaheatfluxesassociatedtomesoscaleeddiesinthesouthwesternatlanticoceanandtheirdependenceondifferentregionalconditions AT solmansilvinaalicia airseaheatfluxesassociatedtomesoscaleeddiesinthesouthwesternatlanticoceanandtheirdependenceondifferentregionalconditions |
| _version_ |
1768546404452532224 |