SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009)
Subseasonal variability of Sea Surface Temperature (SST) in the central Benguela upwelling system is investigated using TMI satellite-derived data over the period 1999-2009. Spatial patterns and time-frequency characteristics of subseasonal variability are documented based on Empirical Orthogonal Fu...
Main Authors: | , , , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2013
|
Subjects: | |
Online Access: | https://www.documentation.ird.fr/hor/fdi:010061263 |
id |
ftird:oai:ird.fr:fdi:010061263 |
---|---|
record_format |
openpolar |
spelling |
ftird:oai:ird.fr:fdi:010061263 2024-09-15T17:43:34+00:00 SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009) /Goubanova, Katerina /Illig, Serena /Machu, Eric Garcon, V. /Dewitte, Boris ATLANTIQUE SUD 2013 https://www.documentation.ird.fr/hor/fdi:010061263 EN eng https://www.documentation.ird.fr/hor/fdi:010061263 oai:ird.fr:fdi:010061263 Goubanova Katerina, Illig Serena, Machu Eric, Garcon V., Dewitte Boris. SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009). 2013, 118 (9), p. 4092-4110 Benguela upwelling satellite observations intraseasonal variability wind-SST relationship mean vertical stratification Antarctic oscillation text 2013 ftird 2024-08-15T05:57:42Z Subseasonal variability of Sea Surface Temperature (SST) in the central Benguela upwelling system is investigated using TMI satellite-derived data over the period 1999-2009. Spatial patterns and time-frequency characteristics of subseasonal variability are documented based on Empirical Orthogonal Functions (EOF) decomposition and wavelet analysis. Despite the land contamination of the TMI satellite data within approximately 100 km off the coast the first EOF of SST anomalies allows characterizing the coastal upwelling variability at the subseasonal scale. Two regimes of variability are evidenced: a submonthly (2-30 days) regime with a dominant 11 days oscillation and a lower frequency intraseasonal (30-90 days) regime with a dominant 61 days oscillation. Both regimes are modulated, to a large extent, by the local surface wind stress and are consistent with Ekman dynamics. The seasonality of the relationship between wind stress and SST for submonthly (intraseasonal) regime is characterized by a marked semiannual (annual) cycle, which is explained in terms of the impact of seasonal change of the upper ocean stratification on the vertical advection process. The wind-driven SST subseasonal variability is shown to be associated with eastward propagating disturbances in the midlatitudes corresponding to a wave number 4. The results also suggest an important role of the Antarctic Oscillation in modulating the intraseasonal wind-driven SST variability. The characteristics of the equatorial intraseasonal Kelvin waves are documented in order to discuss possible impact of remote oceanic forcing on SST variability along the coast in the Benguela upwelling system. Text Antarc* Antarctic IRD (Institute de recherche pour le développement): Horizon |
institution |
Open Polar |
collection |
IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
ftird |
language |
English |
topic |
Benguela upwelling satellite observations intraseasonal variability wind-SST relationship mean vertical stratification Antarctic oscillation |
spellingShingle |
Benguela upwelling satellite observations intraseasonal variability wind-SST relationship mean vertical stratification Antarctic oscillation /Goubanova, Katerina /Illig, Serena /Machu, Eric Garcon, V. /Dewitte, Boris SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009) |
topic_facet |
Benguela upwelling satellite observations intraseasonal variability wind-SST relationship mean vertical stratification Antarctic oscillation |
description |
Subseasonal variability of Sea Surface Temperature (SST) in the central Benguela upwelling system is investigated using TMI satellite-derived data over the period 1999-2009. Spatial patterns and time-frequency characteristics of subseasonal variability are documented based on Empirical Orthogonal Functions (EOF) decomposition and wavelet analysis. Despite the land contamination of the TMI satellite data within approximately 100 km off the coast the first EOF of SST anomalies allows characterizing the coastal upwelling variability at the subseasonal scale. Two regimes of variability are evidenced: a submonthly (2-30 days) regime with a dominant 11 days oscillation and a lower frequency intraseasonal (30-90 days) regime with a dominant 61 days oscillation. Both regimes are modulated, to a large extent, by the local surface wind stress and are consistent with Ekman dynamics. The seasonality of the relationship between wind stress and SST for submonthly (intraseasonal) regime is characterized by a marked semiannual (annual) cycle, which is explained in terms of the impact of seasonal change of the upper ocean stratification on the vertical advection process. The wind-driven SST subseasonal variability is shown to be associated with eastward propagating disturbances in the midlatitudes corresponding to a wave number 4. The results also suggest an important role of the Antarctic Oscillation in modulating the intraseasonal wind-driven SST variability. The characteristics of the equatorial intraseasonal Kelvin waves are documented in order to discuss possible impact of remote oceanic forcing on SST variability along the coast in the Benguela upwelling system. |
format |
Text |
author |
/Goubanova, Katerina /Illig, Serena /Machu, Eric Garcon, V. /Dewitte, Boris |
author_facet |
/Goubanova, Katerina /Illig, Serena /Machu, Eric Garcon, V. /Dewitte, Boris |
author_sort |
/Goubanova, Katerina |
title |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009) |
title_short |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009) |
title_full |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009) |
title_fullStr |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009) |
title_full_unstemmed |
SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009) |
title_sort |
sst subseasonal variability in the central benguela upwelling system as inferred from satellite observations (1999-2009) |
publishDate |
2013 |
url |
https://www.documentation.ird.fr/hor/fdi:010061263 |
op_coverage |
ATLANTIQUE SUD |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010061263 oai:ird.fr:fdi:010061263 Goubanova Katerina, Illig Serena, Machu Eric, Garcon V., Dewitte Boris. SST subseasonal variability in the central Benguela upwelling system as inferred from satellite observations (1999-2009). 2013, 118 (9), p. 4092-4110 |
_version_ |
1810490597329338368 |