Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene
17 pages, 6 figures, 1 table, supporting information https://dx.doi.org/10.1002/2015PA002883, data will be available at the Scientific Earth Drilling Information Service (http://sedis.iodp.org), Pangaea website (http://www.pangaea.de), and NOAA Paleoclimatology (https://www.ncdc.noaa.gov/data-access...
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American Geophysical Union
2016
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Online Access: | http://hdl.handle.net/10261/134645 https://doi.org/10.1002/2015PA002883 https://doi.org/10.13039/501100000782 https://doi.org/10.13039/501100002809 https://doi.org/10.13039/100000001 https://doi.org/10.13039/501100004837 |
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ftcsic:oai:digital.csic.es:10261/134645 2024-02-11T10:08:53+01:00 Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene Povea, Patricia Cacho, Isabel Moreno Caballud, Ana Pena, Leopoldo Menéndez, Melisa Calvo, Eva María Canals, Miquel Robinson, Rebecca S. Méndez, Fernando J. Flores, José Abel European Science Foundation Generalitat de Catalunya National Science Foundation (US) Ministerio de Ciencia e Innovación (España) 2016-05 http://hdl.handle.net/10261/134645 https://doi.org/10.1002/2015PA002883 https://doi.org/10.13039/501100000782 https://doi.org/10.13039/501100002809 https://doi.org/10.13039/100000001 https://doi.org/10.13039/501100004837 unknown American Geophysical Union Publisher's version https://dx.doi.org/10.1002/2015PA002883 Sí doi:10.1002/2015PA002883 issn: 0883-8305 e-issn: 1944-9186 Paleoceanography 31(5): 522-538 (2016) http://hdl.handle.net/10261/134645 http://dx.doi.org/10.13039/501100000782 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/100000001 http://dx.doi.org/10.13039/501100004837 open artículo http://purl.org/coar/resource_type/c_6501 2016 ftcsic https://doi.org/10.1002/2015PA00288310.13039/50110000078210.13039/50110000280910.13039/10000000110.13039/501100004837 2024-01-16T10:16:26Z 17 pages, 6 figures, 1 table, supporting information https://dx.doi.org/10.1002/2015PA002883, data will be available at the Scientific Earth Drilling Information Service (http://sedis.iodp.org), Pangaea website (http://www.pangaea.de), and NOAA Paleoclimatology (https://www.ncdc.noaa.gov/data-access/paleoclimatology-data) Here we present a new set of high-resolution early Pleistocene records from the eastern equatorial Pacific (EEP). Sediment composition from Ocean Drilling Program Sites 1240 and 1238 is used to reconstruct past changes in the atmosphere-ocean system. Particularly remarkable is the presence of laminated diatom oozes (LDOs) during glacial periods between 1.85 and 2.25 Ma coinciding with high fluxes of opal and total organic carbon. Relatively low lithic particles (coarse and poorly sorted) and iron fluxes during these glacial periods indicate that the increased diatom productivity did not result from dust-stimulated fertilization events. We argue that glacial fertilization occurred through the advection of nutrient-rich waters from the Southern Ocean. In contrast, glacial periods after 1.85 Ma are characterized by enhanced dust transport of finer lithic particles acting as a new source of nutrients in the EEP. The benthic ecosystem shows dissimilar responses to the high productivity recorded during glacial periods before and after 1.85 Ma, which suggests that the transport processes delivering organic matter to the deep sea also changed. Different depositional processes are interpreted to be the result of two distinct glacial positions of the Intertropical Convergence Zone (ITCZ). Before 1.85 Ma, the ITCZ was above the equator, with weak local winds and enhanced wet deposition of dust. After 1.85 Ma, the glacial ITCZ was displaced northward, thus bringing stronger winds and stimulating upwelling in the EEP. The glacial period at 1.65 Ma with the most intense LDOs supports a rapid southward migration of the ITCZ comparable to those glacial periods before 1.85 Ma This work has been funded by ... Article in Journal/Newspaper Southern Ocean Digital.CSIC (Spanish National Research Council) Pacific Southern Ocean Paleoceanography 31 5 522 538 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
description |
17 pages, 6 figures, 1 table, supporting information https://dx.doi.org/10.1002/2015PA002883, data will be available at the Scientific Earth Drilling Information Service (http://sedis.iodp.org), Pangaea website (http://www.pangaea.de), and NOAA Paleoclimatology (https://www.ncdc.noaa.gov/data-access/paleoclimatology-data) Here we present a new set of high-resolution early Pleistocene records from the eastern equatorial Pacific (EEP). Sediment composition from Ocean Drilling Program Sites 1240 and 1238 is used to reconstruct past changes in the atmosphere-ocean system. Particularly remarkable is the presence of laminated diatom oozes (LDOs) during glacial periods between 1.85 and 2.25 Ma coinciding with high fluxes of opal and total organic carbon. Relatively low lithic particles (coarse and poorly sorted) and iron fluxes during these glacial periods indicate that the increased diatom productivity did not result from dust-stimulated fertilization events. We argue that glacial fertilization occurred through the advection of nutrient-rich waters from the Southern Ocean. In contrast, glacial periods after 1.85 Ma are characterized by enhanced dust transport of finer lithic particles acting as a new source of nutrients in the EEP. The benthic ecosystem shows dissimilar responses to the high productivity recorded during glacial periods before and after 1.85 Ma, which suggests that the transport processes delivering organic matter to the deep sea also changed. Different depositional processes are interpreted to be the result of two distinct glacial positions of the Intertropical Convergence Zone (ITCZ). Before 1.85 Ma, the ITCZ was above the equator, with weak local winds and enhanced wet deposition of dust. After 1.85 Ma, the glacial ITCZ was displaced northward, thus bringing stronger winds and stimulating upwelling in the EEP. The glacial period at 1.65 Ma with the most intense LDOs supports a rapid southward migration of the ITCZ comparable to those glacial periods before 1.85 Ma This work has been funded by ... |
author2 |
European Science Foundation Generalitat de Catalunya National Science Foundation (US) Ministerio de Ciencia e Innovación (España) |
format |
Article in Journal/Newspaper |
author |
Povea, Patricia Cacho, Isabel Moreno Caballud, Ana Pena, Leopoldo Menéndez, Melisa Calvo, Eva María Canals, Miquel Robinson, Rebecca S. Méndez, Fernando J. Flores, José Abel |
spellingShingle |
Povea, Patricia Cacho, Isabel Moreno Caballud, Ana Pena, Leopoldo Menéndez, Melisa Calvo, Eva María Canals, Miquel Robinson, Rebecca S. Méndez, Fernando J. Flores, José Abel Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene |
author_facet |
Povea, Patricia Cacho, Isabel Moreno Caballud, Ana Pena, Leopoldo Menéndez, Melisa Calvo, Eva María Canals, Miquel Robinson, Rebecca S. Méndez, Fernando J. Flores, José Abel |
author_sort |
Povea, Patricia |
title |
Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene |
title_short |
Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene |
title_full |
Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene |
title_fullStr |
Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene |
title_full_unstemmed |
Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene |
title_sort |
atmosphere-ocean linkages in the eastern equatorial pacific over the early pleistocene |
publisher |
American Geophysical Union |
publishDate |
2016 |
url |
http://hdl.handle.net/10261/134645 https://doi.org/10.1002/2015PA002883 https://doi.org/10.13039/501100000782 https://doi.org/10.13039/501100002809 https://doi.org/10.13039/100000001 https://doi.org/10.13039/501100004837 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Publisher's version https://dx.doi.org/10.1002/2015PA002883 Sí doi:10.1002/2015PA002883 issn: 0883-8305 e-issn: 1944-9186 Paleoceanography 31(5): 522-538 (2016) http://hdl.handle.net/10261/134645 http://dx.doi.org/10.13039/501100000782 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/100000001 http://dx.doi.org/10.13039/501100004837 |
op_rights |
open |
op_doi |
https://doi.org/10.1002/2015PA00288310.13039/50110000078210.13039/50110000280910.13039/10000000110.13039/501100004837 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
5 |
container_start_page |
522 |
op_container_end_page |
538 |
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1790608524905021440 |