Malvinas Current at 40°S–41°S: First Assessment of Temperature and Salinity Temporal Variability
The temporal variability of 11 months of in situ velocity, temperature, and salinity data collected at five moorings deployed at 40°S–41°S across the shelf-break in the Southwestern Atlantic is analyzed. Two distinct regimes characterized by strong and weak along-slope velocities are present. During...
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ftunibueairesbd:paper:paper_21699275_v123_n8_p5323_Paniagua 2023-05-15T13:51:24+02:00 Malvinas Current at 40°S–41°S: First Assessment of Temperature and Salinity Temporal Variability 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699275_v123_n8_p5323_Paniagua https://hdl.handle.net/20.500.12110/paper_21699275_v123_n8_p5323_Paniagua unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699275_v123_n8_p5323_Paniagua http://hdl.handle.net/20.500.12110/paper_21699275_v123_n8_p5323_Paniagua Malvinas Current Moorings Salinity Temperature Time series assessment method comparative study mode water mooring system sea surface temperature shelf break temporal variation time series analysis water mass Atlantic Ocean Atlantic Ocean (Southwest) 2018 ftunibueairesbd https://doi.org/20.500.12110/paper_21699275_v123_n8_p5323_Paniagua 2023-02-16T02:07:50Z The temporal variability of 11 months of in situ velocity, temperature, and salinity data collected at five moorings deployed at 40°S–41°S across the shelf-break in the Southwestern Atlantic is analyzed. Two distinct regimes characterized by strong and weak along-slope velocities are present. During the strong regime the Malvinas Current flows northward through the moorings while during the nearly 5 months long weak regime reversals of the along-slope velocities are frequently observed. Comparison with the previous in situ time series obtained in the same region shows that such an extended period of weak flow has not been previously observed. During the weak regime, Sub-Antarctic Mode Water is observed over the 1,800 m isobath at an average depth of 500 m. Water masses occupying the upper 1,600 m during the strong regime deepen and shift eastward during the weak period. Satellite geostrophic velocities and sea surface temperature clearly show that the weak regime is due to a deflection to the east of the Malvinas Current, upstream of the mooring position. Analysis of the vertical structure of the currents indicate that during the weak regime the flow weakens mostly at the surface and presents a very small vertical shear. In contrast, during the strong regime currents are surface-intensified. The change in the structure of the currents at the mooring location impacts the relationship between in situ and altimetry-derived currents: during the weak regime altimetry adequately represents (rmsd 12 cm/s) in situ currents in the whole water column, while during strong regime rmsd are larger than 15 cm/s below 600 m depth. ©2018. American Geophysical Union. All Rights Reserved. Other/Unknown Material Antarc* Antarctic Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Antarctic |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Malvinas Current Moorings Salinity Temperature Time series assessment method comparative study mode water mooring system sea surface temperature shelf break temporal variation time series analysis water mass Atlantic Ocean Atlantic Ocean (Southwest) |
spellingShingle |
Malvinas Current Moorings Salinity Temperature Time series assessment method comparative study mode water mooring system sea surface temperature shelf break temporal variation time series analysis water mass Atlantic Ocean Atlantic Ocean (Southwest) Malvinas Current at 40°S–41°S: First Assessment of Temperature and Salinity Temporal Variability |
topic_facet |
Malvinas Current Moorings Salinity Temperature Time series assessment method comparative study mode water mooring system sea surface temperature shelf break temporal variation time series analysis water mass Atlantic Ocean Atlantic Ocean (Southwest) |
description |
The temporal variability of 11 months of in situ velocity, temperature, and salinity data collected at five moorings deployed at 40°S–41°S across the shelf-break in the Southwestern Atlantic is analyzed. Two distinct regimes characterized by strong and weak along-slope velocities are present. During the strong regime the Malvinas Current flows northward through the moorings while during the nearly 5 months long weak regime reversals of the along-slope velocities are frequently observed. Comparison with the previous in situ time series obtained in the same region shows that such an extended period of weak flow has not been previously observed. During the weak regime, Sub-Antarctic Mode Water is observed over the 1,800 m isobath at an average depth of 500 m. Water masses occupying the upper 1,600 m during the strong regime deepen and shift eastward during the weak period. Satellite geostrophic velocities and sea surface temperature clearly show that the weak regime is due to a deflection to the east of the Malvinas Current, upstream of the mooring position. Analysis of the vertical structure of the currents indicate that during the weak regime the flow weakens mostly at the surface and presents a very small vertical shear. In contrast, during the strong regime currents are surface-intensified. The change in the structure of the currents at the mooring location impacts the relationship between in situ and altimetry-derived currents: during the weak regime altimetry adequately represents (rmsd 12 cm/s) in situ currents in the whole water column, while during strong regime rmsd are larger than 15 cm/s below 600 m depth. ©2018. American Geophysical Union. All Rights Reserved. |
title |
Malvinas Current at 40°S–41°S: First Assessment of Temperature and Salinity Temporal Variability |
title_short |
Malvinas Current at 40°S–41°S: First Assessment of Temperature and Salinity Temporal Variability |
title_full |
Malvinas Current at 40°S–41°S: First Assessment of Temperature and Salinity Temporal Variability |
title_fullStr |
Malvinas Current at 40°S–41°S: First Assessment of Temperature and Salinity Temporal Variability |
title_full_unstemmed |
Malvinas Current at 40°S–41°S: First Assessment of Temperature and Salinity Temporal Variability |
title_sort |
malvinas current at 40°s–41°s: first assessment of temperature and salinity temporal variability |
publishDate |
2018 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699275_v123_n8_p5323_Paniagua https://hdl.handle.net/20.500.12110/paper_21699275_v123_n8_p5323_Paniagua |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21699275_v123_n8_p5323_Paniagua http://hdl.handle.net/20.500.12110/paper_21699275_v123_n8_p5323_Paniagua |
op_doi |
https://doi.org/20.500.12110/paper_21699275_v123_n8_p5323_Paniagua |
_version_ |
1766255250337955840 |