Brazil Malvinas Frontal System as seen from 9 years of advanced very high resolution radiometer data

Surface thermal fronts in the southwestern Atlantic (SWA) Ocean are examined using 9 years (1987-1995) of advanced very high resolution radiometer data. Fronts are detected considering a gradient based edge detector. Sea surface temperature gradients are calculated from 4 km resolution 5-day composi...

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Autores principales: Saraceno, M., Provost, C., Piola, A.R., Bava, J., Gagliardini, A.
Formato: JOUR
Materias:
Brazil Malvinas Conference
Sea surface temperature fronts
Southwest Atlantic
AVHRR
frontal feature
image analysis
remote sensing
sea surface temperature
shelf break
temperature gradient
Atlantic Ocean
Atlantic Ocean (Southwest)
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01480227_v109_n5_pC050271_Saraceno
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01480227_v109_n5_pC050271_Saraceno2023-10-03T15:00:54Z Brazil Malvinas Frontal System as seen from 9 years of advanced very high resolution radiometer data Saraceno, M. Provost, C. Piola, A.R. Bava, J. Gagliardini, A. Brazil Malvinas Conference Sea surface temperature fronts Southwest Atlantic AVHRR frontal feature image analysis remote sensing sea surface temperature shelf break temperature gradient Atlantic Ocean Atlantic Ocean (Southwest) Surface thermal fronts in the southwestern Atlantic (SWA) Ocean are examined using 9 years (1987-1995) of advanced very high resolution radiometer data. Fronts are detected considering a gradient based edge detector. Sea surface temperature gradients are calculated from 4 km resolution 5-day composite images covering the western Argentine Basin south of 30°S. Variability in the position and intensity of the fronts from seasonal to interannual timescales is characterized in six regions including different parts of the Brazil Current Front (BCF) and the Subantarctic Front (SAF): Shelf Break-Brazil (SB-B), Brazil Malvinas Collision (BM-C), Brazil Current-Overshoot (BC-O), Shelf Break-Malvinas (SB-M), Malvinas Return Flow (MRF), and Falkland Escarpment (FE). Fronts in the SB-B, SB-M, MRF, and FE regions are controlled by the bathymetry. In the BM-C region the BCF and SAF appear to merge as a single front. This front does not present large seasonal north-south excursions as previously described, though it pivots seasonally around a fixed point located approximately at 39.5°S, 53.5°W, changing its orientation from N-S in winter to NW-SE in summer. Consequently, on average, the front intersects the 1000 m isobath at 38°30′S in summer and north of 37°S in winter. In the BC-O region the BCF has a U-shape centered at 53°W. The intensity of the fronts in each region except in the FE region presents large seasonal variability. In the SB-B, BM-C, and BC-O regions the frontal intensity is highest (>0.35°C/km) during austral winter, the annual components explain 83, 67, and 71% of the total variance, respectively. In the SB-M and MRF regions the SAF is most intense (>0.25°C/km) in summer and fall; the annual component of the intensity fluctuations explains 29 and 38% of the total variance, respectively. In the FE region the annual component of frontal intensity explains only 17% of the variability. In the six regions, important interannual variability is found. The Zapiola Rise (centered at 45°S, 43°W) appears as a gradient-free region. Closed planetary potential vorticity contours in this area suggest it is dynamically isolated. Copyright 2004 by the American Geophysical Union. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01480227_v109_n5_pC050271_Saraceno
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Brazil Malvinas Conference
Sea surface temperature fronts
Southwest Atlantic
AVHRR
frontal feature
image analysis
remote sensing
sea surface temperature
shelf break
temperature gradient
Atlantic Ocean
Atlantic Ocean (Southwest)
spellingShingle Brazil Malvinas Conference
Sea surface temperature fronts
Southwest Atlantic
AVHRR
frontal feature
image analysis
remote sensing
sea surface temperature
shelf break
temperature gradient
Atlantic Ocean
Atlantic Ocean (Southwest)
Saraceno, M.
Provost, C.
Piola, A.R.
Bava, J.
Gagliardini, A.
Brazil Malvinas Frontal System as seen from 9 years of advanced very high resolution radiometer data
topic_facet Brazil Malvinas Conference
Sea surface temperature fronts
Southwest Atlantic
AVHRR
frontal feature
image analysis
remote sensing
sea surface temperature
shelf break
temperature gradient
Atlantic Ocean
Atlantic Ocean (Southwest)
description Surface thermal fronts in the southwestern Atlantic (SWA) Ocean are examined using 9 years (1987-1995) of advanced very high resolution radiometer data. Fronts are detected considering a gradient based edge detector. Sea surface temperature gradients are calculated from 4 km resolution 5-day composite images covering the western Argentine Basin south of 30°S. Variability in the position and intensity of the fronts from seasonal to interannual timescales is characterized in six regions including different parts of the Brazil Current Front (BCF) and the Subantarctic Front (SAF): Shelf Break-Brazil (SB-B), Brazil Malvinas Collision (BM-C), Brazil Current-Overshoot (BC-O), Shelf Break-Malvinas (SB-M), Malvinas Return Flow (MRF), and Falkland Escarpment (FE). Fronts in the SB-B, SB-M, MRF, and FE regions are controlled by the bathymetry. In the BM-C region the BCF and SAF appear to merge as a single front. This front does not present large seasonal north-south excursions as previously described, though it pivots seasonally around a fixed point located approximately at 39.5°S, 53.5°W, changing its orientation from N-S in winter to NW-SE in summer. Consequently, on average, the front intersects the 1000 m isobath at 38°30′S in summer and north of 37°S in winter. In the BC-O region the BCF has a U-shape centered at 53°W. The intensity of the fronts in each region except in the FE region presents large seasonal variability. In the SB-B, BM-C, and BC-O regions the frontal intensity is highest (>0.35°C/km) during austral winter, the annual components explain 83, 67, and 71% of the total variance, respectively. In the SB-M and MRF regions the SAF is most intense (>0.25°C/km) in summer and fall; the annual component of the intensity fluctuations explains 29 and 38% of the total variance, respectively. In the FE region the annual component of frontal intensity explains only 17% of the variability. In the six regions, important interannual variability is found. The Zapiola Rise (centered at 45°S, 43°W) appears as a gradient-free region. Closed planetary potential vorticity contours in this area suggest it is dynamically isolated. Copyright 2004 by the American Geophysical Union.
format JOUR
author Saraceno, M.
Provost, C.
Piola, A.R.
Bava, J.
Gagliardini, A.
author_facet Saraceno, M.
Provost, C.
Piola, A.R.
Bava, J.
Gagliardini, A.
author_sort Saraceno, M.
title Brazil Malvinas Frontal System as seen from 9 years of advanced very high resolution radiometer data
title_short Brazil Malvinas Frontal System as seen from 9 years of advanced very high resolution radiometer data
title_full Brazil Malvinas Frontal System as seen from 9 years of advanced very high resolution radiometer data
title_fullStr Brazil Malvinas Frontal System as seen from 9 years of advanced very high resolution radiometer data
title_full_unstemmed Brazil Malvinas Frontal System as seen from 9 years of advanced very high resolution radiometer data
title_sort brazil malvinas frontal system as seen from 9 years of advanced very high resolution radiometer data
url http://hdl.handle.net/20.500.12110/paper_01480227_v109_n5_pC050271_Saraceno
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AT bavaj brazilmalvinasfrontalsystemasseenfrom9yearsofadvancedveryhighresolutionradiometerdata
AT gagliardinia brazilmalvinasfrontalsystemasseenfrom9yearsofadvancedveryhighresolutionradiometerdata
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