Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum
ABSTRACT FINAL ID: PP22C-08 One of the most prominent features of the circulation in the Gulf of Mexico is the Loop Current (LC). It is of special interest as it influences not only the climate in the Gulf of Mexico. Although causation is not well understood yet, dynamical relationships between LC r...
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ftoceanrep:oai:oceanrep.geomar.de:13580 2023-05-15T17:32:33+02:00 Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum Mildner, Tanja C. Eden, Carsten Nürnberg, Dirk Schönfeld, Joachim 2011 https://oceanrep.geomar.de/id/eprint/13580/ unknown Mildner, T. C., Eden, C., Nürnberg, D. and Schönfeld, J. (2011) Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum. [Talk] In: AGU Fall Meeting 2011. , 05.12.-09.12.2011, San Francisco, California, USA . Conference or Workshop Item NonPeerReviewed 2011 ftoceanrep 2023-04-07T15:02:48Z ABSTRACT FINAL ID: PP22C-08 One of the most prominent features of the circulation in the Gulf of Mexico is the Loop Current (LC). It is of special interest as it influences not only the climate in the Gulf of Mexico. Although causation is not well understood yet, dynamical relationships between LC retraction and extension, seasonal migrations of the Intertropical Convergence Zone (ITCZ) and the related wind stress curl over the subtropical North Atlantic, and changes in the thermohaline circulation are indicated by model simulations. A characteristic feature of the LC is the shedding of anticyclonic eddies. These eddies can have depth signatures of up to 1000 m and are of special interest as they supply heat and moisture into the western and northern Gulf. The eddies are generated aperiodically every 3 to 21 months, with an average shedding time of 9.5 months. Eddy shedding appears to be related to a suite of oceanographic forcing fields such as the Yucatan Channel throughflow, the Florida Current and North Brazil Current variability, as well as synoptic meteorological forcing variability. By combining state-of-the-art paleoceanographic and meso-scale eddy-resolving numerical modeling techniques, we examined the Loop Current dynamics and hydrographic changes in the Gulf going back in time up to ~21,000 years. To assess the impact of Last Glacial Maximum (LGM) wind stress and reduced sea level we have re-configured an existing hierarchy of models of the North Atlantic Ocean (FLAME) with a horizontal grid resolution of ca. 30 km (wind stress was taken from the PMIP-II database). The sea level was lowered compared to the CONTROL run by 110 m and 67 m. These sea level changes have been chosen according to the cold-deglacial periods Heinrich I and Younger Dryas. The result of our model simulations is a continuous increase in eddy shedding from the LGM to the Holocene. This increase is predominantly controlled by the continuous deglacial sea level rise. Changes in wind stress curl related to the southward displacement ... Conference Object North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
unknown |
description |
ABSTRACT FINAL ID: PP22C-08 One of the most prominent features of the circulation in the Gulf of Mexico is the Loop Current (LC). It is of special interest as it influences not only the climate in the Gulf of Mexico. Although causation is not well understood yet, dynamical relationships between LC retraction and extension, seasonal migrations of the Intertropical Convergence Zone (ITCZ) and the related wind stress curl over the subtropical North Atlantic, and changes in the thermohaline circulation are indicated by model simulations. A characteristic feature of the LC is the shedding of anticyclonic eddies. These eddies can have depth signatures of up to 1000 m and are of special interest as they supply heat and moisture into the western and northern Gulf. The eddies are generated aperiodically every 3 to 21 months, with an average shedding time of 9.5 months. Eddy shedding appears to be related to a suite of oceanographic forcing fields such as the Yucatan Channel throughflow, the Florida Current and North Brazil Current variability, as well as synoptic meteorological forcing variability. By combining state-of-the-art paleoceanographic and meso-scale eddy-resolving numerical modeling techniques, we examined the Loop Current dynamics and hydrographic changes in the Gulf going back in time up to ~21,000 years. To assess the impact of Last Glacial Maximum (LGM) wind stress and reduced sea level we have re-configured an existing hierarchy of models of the North Atlantic Ocean (FLAME) with a horizontal grid resolution of ca. 30 km (wind stress was taken from the PMIP-II database). The sea level was lowered compared to the CONTROL run by 110 m and 67 m. These sea level changes have been chosen according to the cold-deglacial periods Heinrich I and Younger Dryas. The result of our model simulations is a continuous increase in eddy shedding from the LGM to the Holocene. This increase is predominantly controlled by the continuous deglacial sea level rise. Changes in wind stress curl related to the southward displacement ... |
format |
Conference Object |
author |
Mildner, Tanja C. Eden, Carsten Nürnberg, Dirk Schönfeld, Joachim |
spellingShingle |
Mildner, Tanja C. Eden, Carsten Nürnberg, Dirk Schönfeld, Joachim Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum |
author_facet |
Mildner, Tanja C. Eden, Carsten Nürnberg, Dirk Schönfeld, Joachim |
author_sort |
Mildner, Tanja C. |
title |
Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum |
title_short |
Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum |
title_full |
Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum |
title_fullStr |
Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum |
title_full_unstemmed |
Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum |
title_sort |
loop current variability due to wind stress and reduced sea level during the last glacial maximum |
publishDate |
2011 |
url |
https://oceanrep.geomar.de/id/eprint/13580/ |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Curl |
geographic_facet |
Curl |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Mildner, T. C., Eden, C., Nürnberg, D. and Schönfeld, J. (2011) Loop current variability due to wind stress and reduced sea level during the Last Glacial Maximum. [Talk] In: AGU Fall Meeting 2011. , 05.12.-09.12.2011, San Francisco, California, USA . |
_version_ |
1766130743324442624 |