Persistent monsoonal forcing of Mediterranean Outflow dynamics during the late Pleistocene
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2015
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| _version_ | 1867168566969630720 |
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| author | Bahr, André Kaboth, Stefanie Jiménez-Espejo, Francisco Jose Sierro, Francisco Javier Voelker, Antje H L Lourens, Lucas Joost Röhl, Ursula Reichart, Gert-Jan Escutia, Carlota Hernandéz-Molina, Francisco Javier Pross, Jörg Friedrich, Oliver |
| author_facet | Bahr, André Kaboth, Stefanie Jiménez-Espejo, Francisco Jose Sierro, Francisco Javier Voelker, Antje H L Lourens, Lucas Joost Röhl, Ursula Reichart, Gert-Jan Escutia, Carlota Hernandéz-Molina, Francisco Javier Pross, Jörg Friedrich, Oliver |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The mode and vigor of the global oceanic circulation critically depend on the salinity of (sub)surface water masses advected to the loci of deep-water formation. Within the Atlantic meridional overturning circulation (AMOC), an important supplier of high-salinity waters is the Mediterranean Outflow Water (MOW), discharging into the North Atlantic via the Strait of Gibraltar. Despite its importance for the North Atlantic salinity budget, the long-term dynamics of MOW production have remained poorly understood. Here we present high-resolution records of bottom-current velocity from three drill sites within the Gulf of Cádiz that document a persistent low-latitude forcing of MOW flow speed over the past ~150 k.y. We demonstrate that the African monsoon is the predominant driver of orbital-scale MOW variability via its influence on the freshwater budget of the eastern Mediterranean Sea. Consequently, MOW formation fluctuates in concert with orbital precession overprinted by centennial-scale oscillations of high-latitude origin. We further document that Northern Hemisphere summer insolation minima stimulate maximal injection of MOW-derived salt into the North Atlantic, likely strengthening the intermediate AMOC branch. The direct coupling of MOW dynamics to low-latitude climate forcing represents a hitherto neglected process for propagating (sub)tropical climate signals into the high northern latitudes. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_849504 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Persistent monsoonal forcing of Mediterranean Outflow dynamics during the late Pleistocene Bahr, André Kaboth, Stefanie Jiménez-Espejo, Francisco Jose Sierro, Francisco Javier Voelker, Antje H L Lourens, Lucas Joost Röhl, Ursula Reichart, Gert-Jan Escutia, Carlota Hernandéz-Molina, Francisco Javier Pross, Jörg Friedrich, Oliver 339-U1386; 339-U1387; 339-U1389; Azores; CALYPSO; Calypso Corer; COMPCORE; Composite Core; Exp339; IMAGES I; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Marion Dufresne (1995); MD101__Campaign; MD952037; MD95-2037; Mediterranean Outflow The mode and vigor of the global oceanic circulation critically depend on the salinity of (sub)surface water masses advected to the loci of deep-water formation. Within the Atlantic meridional overturning circulation (AMOC), an important supplier of high-salinity waters is the Mediterranean Outflow Water (MOW), discharging into the North Atlantic via the Strait of Gibraltar. Despite its importance for the North Atlantic salinity budget, the long-term dynamics of MOW production have remained poorly understood. Here we present high-resolution records of bottom-current velocity from three drill sites within the Gulf of Cádiz that document a persistent low-latitude forcing of MOW flow speed over the past ~150 k.y. We demonstrate that the African monsoon is the predominant driver of orbital-scale MOW variability via its influence on the freshwater budget of the eastern Mediterranean Sea. Consequently, MOW formation fluctuates in concert with orbital precession overprinted by centennial-scale oscillations of high-latitude origin. We further document that Northern Hemisphere summer insolation minima stimulate maximal injection of MOW-derived salt into the North Atlantic, likely strengthening the intermediate AMOC branch. The direct coupling of MOW dynamics to low-latitude climate forcing represents a hitherto neglected process for propagating (sub)tropical climate signals into the high northern latitudes. |
| title | Persistent monsoonal forcing of Mediterranean Outflow dynamics during the late Pleistocene |
| topic | 339-U1386; 339-U1387; 339-U1389; Azores; CALYPSO; Calypso Corer; COMPCORE; Composite Core; Exp339; IMAGES I; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Marion Dufresne (1995); MD101__Campaign; MD952037; MD95-2037; Mediterranean Outflow |
| url | https://doi.org/10.1594/PANGAEA.849504 |