Planktic foraminiferal distribution and paleotemperature reconstruction for the last 560 kyr of ODP Hole 165-999A from the Carribean Sea
Faunal analyses of planktonic foraminifera and upper-water temperature reconstructions with the modern analog technique are studied and compared to themagnetic susceptibility and gamma ray logs of ODP Core 999A (western Caribbean) for the past 560 kyr in order to explore changes in paleoceanographic...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.672067 2024-09-15T18:19:32+00:00 Planktic foraminiferal distribution and paleotemperature reconstruction for the last 560 kyr of ODP Hole 165-999A from the Carribean Sea Martínez, José Ignacio Mora, Germán Barrows, Timothy T LATITUDE: 12.744000 * LONGITUDE: -78.739300 * DATE/TIME START: 1996-01-10T19:30:00 * DATE/TIME END: 1996-01-14T23:15:00 2007 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.672067 https://doi.org/10.1594/PANGAEA.672067 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.672067 https://doi.org/10.1594/PANGAEA.672067 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Martínez, José Ignacio; Mora, Germán; Barrows, Timothy T (2007): Paleoceanographic conditions in the western Caribbean Sea for the last 560 kyr as inferred from planktonic foraminifera. Marine Micropaleontology, 64(3-4), 177-188, https://doi.org/10.1016/j.marmicro.2007.04.004 165-999A Caribbean Sea DRILL Drilling/drill rig Joides Resolution Leg165 Ocean Drilling Program ODP dataset publication series 2007 ftpangaea https://doi.org/10.1594/PANGAEA.67206710.1016/j.marmicro.2007.04.004 2024-07-24T02:31:42Z Faunal analyses of planktonic foraminifera and upper-water temperature reconstructions with the modern analog technique are studied and compared to themagnetic susceptibility and gamma ray logs of ODP Core 999A (western Caribbean) for the past 560 kyr in order to explore changes in paleoceanographic conditions in the western Caribbean Sea. Long-term trends in the percentage abundance of planktonic foraminifera inODP Core 999Asuggest two hydrographic scenarios: before and after 480 ka.High percentage abundances of Neogloboquadrina pachyderma and Globorotalia inflata, low abundances of Globorotalia menardii and Globorotalia truncatulinoides, low diversity, and sea-surface temperatures (SST) under 24 °C are typical characteristics occurring from 480 to 560 ka. These characteristics suggest a “shallow” well-oxygenated upper thermocline and the influx of nutrients by either seasonal upwelling plumes and/or eddy-mediated entrainment. The second scenario occurred after 480 ka, and it is characterized by high and fluctuating percentage abundances of Neogloboquadrina dutertrei, G. truncatulinoides, G. menardii, Globigerinita glutinata, Globigerinella siphonifera, and Globigerinoides ruber; a declining trend in diversity; and large SSTs. These characteristics suggest a steady change from conditions characterized by a “shallow” thermocline and chlorophyll maximum to conditions characterized by a “deep” thermocline (mainly during glacial stages) and by more oligotrophic conditions. The influence of the subtropical North Atlantic on the upper thermocline was apparently larger during glacial stages, thus favoring a deepening of the thermocline, an increase in sea-surface salinity, and a dramatic reduction of nutrients in the Guajira upwelling system. During interglacial stages, the influx of nutrients from the Magdalena River is stronger, thus resulting in a deep chlorophyll maximumand a fresher upper ocean. The eddy entrainment of nutrients is the probable mechanism responsible of transport from the Guajira upwelling and ... Other/Unknown Material Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-78.739300,-78.739300,12.744000,12.744000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
165-999A Caribbean Sea DRILL Drilling/drill rig Joides Resolution Leg165 Ocean Drilling Program ODP |
spellingShingle |
165-999A Caribbean Sea DRILL Drilling/drill rig Joides Resolution Leg165 Ocean Drilling Program ODP Martínez, José Ignacio Mora, Germán Barrows, Timothy T Planktic foraminiferal distribution and paleotemperature reconstruction for the last 560 kyr of ODP Hole 165-999A from the Carribean Sea |
topic_facet |
165-999A Caribbean Sea DRILL Drilling/drill rig Joides Resolution Leg165 Ocean Drilling Program ODP |
description |
Faunal analyses of planktonic foraminifera and upper-water temperature reconstructions with the modern analog technique are studied and compared to themagnetic susceptibility and gamma ray logs of ODP Core 999A (western Caribbean) for the past 560 kyr in order to explore changes in paleoceanographic conditions in the western Caribbean Sea. Long-term trends in the percentage abundance of planktonic foraminifera inODP Core 999Asuggest two hydrographic scenarios: before and after 480 ka.High percentage abundances of Neogloboquadrina pachyderma and Globorotalia inflata, low abundances of Globorotalia menardii and Globorotalia truncatulinoides, low diversity, and sea-surface temperatures (SST) under 24 °C are typical characteristics occurring from 480 to 560 ka. These characteristics suggest a “shallow” well-oxygenated upper thermocline and the influx of nutrients by either seasonal upwelling plumes and/or eddy-mediated entrainment. The second scenario occurred after 480 ka, and it is characterized by high and fluctuating percentage abundances of Neogloboquadrina dutertrei, G. truncatulinoides, G. menardii, Globigerinita glutinata, Globigerinella siphonifera, and Globigerinoides ruber; a declining trend in diversity; and large SSTs. These characteristics suggest a steady change from conditions characterized by a “shallow” thermocline and chlorophyll maximum to conditions characterized by a “deep” thermocline (mainly during glacial stages) and by more oligotrophic conditions. The influence of the subtropical North Atlantic on the upper thermocline was apparently larger during glacial stages, thus favoring a deepening of the thermocline, an increase in sea-surface salinity, and a dramatic reduction of nutrients in the Guajira upwelling system. During interglacial stages, the influx of nutrients from the Magdalena River is stronger, thus resulting in a deep chlorophyll maximumand a fresher upper ocean. The eddy entrainment of nutrients is the probable mechanism responsible of transport from the Guajira upwelling and ... |
format |
Other/Unknown Material |
author |
Martínez, José Ignacio Mora, Germán Barrows, Timothy T |
author_facet |
Martínez, José Ignacio Mora, Germán Barrows, Timothy T |
author_sort |
Martínez, José Ignacio |
title |
Planktic foraminiferal distribution and paleotemperature reconstruction for the last 560 kyr of ODP Hole 165-999A from the Carribean Sea |
title_short |
Planktic foraminiferal distribution and paleotemperature reconstruction for the last 560 kyr of ODP Hole 165-999A from the Carribean Sea |
title_full |
Planktic foraminiferal distribution and paleotemperature reconstruction for the last 560 kyr of ODP Hole 165-999A from the Carribean Sea |
title_fullStr |
Planktic foraminiferal distribution and paleotemperature reconstruction for the last 560 kyr of ODP Hole 165-999A from the Carribean Sea |
title_full_unstemmed |
Planktic foraminiferal distribution and paleotemperature reconstruction for the last 560 kyr of ODP Hole 165-999A from the Carribean Sea |
title_sort |
planktic foraminiferal distribution and paleotemperature reconstruction for the last 560 kyr of odp hole 165-999a from the carribean sea |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.672067 https://doi.org/10.1594/PANGAEA.672067 |
op_coverage |
LATITUDE: 12.744000 * LONGITUDE: -78.739300 * DATE/TIME START: 1996-01-10T19:30:00 * DATE/TIME END: 1996-01-14T23:15:00 |
long_lat |
ENVELOPE(-78.739300,-78.739300,12.744000,12.744000) |
genre |
Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
genre_facet |
Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Martínez, José Ignacio; Mora, Germán; Barrows, Timothy T (2007): Paleoceanographic conditions in the western Caribbean Sea for the last 560 kyr as inferred from planktonic foraminifera. Marine Micropaleontology, 64(3-4), 177-188, https://doi.org/10.1016/j.marmicro.2007.04.004 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.672067 https://doi.org/10.1594/PANGAEA.672067 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.67206710.1016/j.marmicro.2007.04.004 |
_version_ |
1810457882994409472 |