Atmosphere-ocean linkages in the Eastern Equatorial Pacific over the early Pleistocene
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 lamina...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.902531 2023-05-15T18:25:55+02:00 Atmosphere-ocean linkages in the Eastern Equatorial Pacific over the early Pleistocene Povea, Patricia Cacho, Isabel Moreno, Ana Pena, Leopoldo D Menéndez, M Calvo, Eva Canals, Miquel Robinson, Rebecca S Mendez, Fernando J Flores, José-Abel MEDIAN LATITUDE: -0.333216 * MEDIAN LONGITUDE: -85.772556 * SOUTH-BOUND LATITUDE: -1.871833 * WEST-BOUND LONGITUDE: -86.462630 * NORTH-BOUND LATITUDE: 0.021850 * EAST-BOUND LONGITUDE: -82.782233 * DATE/TIME START: 2002-05-05T20:00:00 * DATE/TIME END: 2002-05-16T00:00:00 2019-06-11 application/zip, 16 datasets https://doi.pangaea.de/10.1594/PANGAEA.902531 https://doi.org/10.1594/PANGAEA.902531 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.902531 https://doi.org/10.1594/PANGAEA.902531 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Povea, Patricia; Cacho, Isabel; Moreno, Ana; Pena, Leopoldo D; Menéndez, M; Calvo, Eva; Canals, Miquel; Robinson, Rebecca S; Mendez, Fernando J; Flores, José-Abel (2016): Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene. Paleoceanography, 31(5), 522-538, https://doi.org/10.1002/2015PA002883 Atmosphere dust Eastern Equatorial Pacific ITCZ ocean ODP 1240 productivity Dataset 2019 ftpangaea https://doi.org/10.1594/PANGAEA.902531 https://doi.org/10.1002/2015PA002883 2023-01-20T07:34:20Z 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. Dataset Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Southern Ocean Pacific ENVELOPE(-86.462630,-82.782233,0.021850,-1.871833) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Atmosphere dust Eastern Equatorial Pacific ITCZ ocean ODP 1240 productivity |
spellingShingle |
Atmosphere dust Eastern Equatorial Pacific ITCZ ocean ODP 1240 productivity Povea, Patricia Cacho, Isabel Moreno, Ana Pena, Leopoldo D Menéndez, M Calvo, Eva Canals, Miquel Robinson, Rebecca S Mendez, Fernando J Flores, José-Abel Atmosphere-ocean linkages in the Eastern Equatorial Pacific over the early Pleistocene |
topic_facet |
Atmosphere dust Eastern Equatorial Pacific ITCZ ocean ODP 1240 productivity |
description |
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. |
format |
Dataset |
author |
Povea, Patricia Cacho, Isabel Moreno, Ana Pena, Leopoldo D Menéndez, M Calvo, Eva Canals, Miquel Robinson, Rebecca S Mendez, Fernando J Flores, José-Abel |
author_facet |
Povea, Patricia Cacho, Isabel Moreno, Ana Pena, Leopoldo D Menéndez, M Calvo, Eva Canals, Miquel Robinson, Rebecca S Mendez, 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 |
PANGAEA |
publishDate |
2019 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.902531 https://doi.org/10.1594/PANGAEA.902531 |
op_coverage |
MEDIAN LATITUDE: -0.333216 * MEDIAN LONGITUDE: -85.772556 * SOUTH-BOUND LATITUDE: -1.871833 * WEST-BOUND LONGITUDE: -86.462630 * NORTH-BOUND LATITUDE: 0.021850 * EAST-BOUND LONGITUDE: -82.782233 * DATE/TIME START: 2002-05-05T20:00:00 * DATE/TIME END: 2002-05-16T00:00:00 |
long_lat |
ENVELOPE(-86.462630,-82.782233,0.021850,-1.871833) |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Supplement to: Povea, Patricia; Cacho, Isabel; Moreno, Ana; Pena, Leopoldo D; Menéndez, M; Calvo, Eva; Canals, Miquel; Robinson, Rebecca S; Mendez, Fernando J; Flores, José-Abel (2016): Atmosphere-ocean linkages in the eastern equatorial Pacific over the early Pleistocene. Paleoceanography, 31(5), 522-538, https://doi.org/10.1002/2015PA002883 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.902531 https://doi.org/10.1594/PANGAEA.902531 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.902531 https://doi.org/10.1002/2015PA002883 |
_version_ |
1766207652435591168 |