Atlantic and Pacific benthic Mg/Ca temperatures 0-12 Ma
The Late Neogene witnessed various major paleoceanographic changes that culminated in intense Northern Hemisphere Glaciation (NHG). The cause and effects of these changes are still debated. We use a multiproxy approach to determine the relative timing of the closure of the Panama gateway, changes in...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.913906 2024-09-15T18:12:34+00:00 Atlantic and Pacific benthic Mg/Ca temperatures 0-12 Ma Lear, Caroline H Rosenthal, Yair Wright, James D MEDIAN LATITUDE: 2.018821 * MEDIAN LONGITUDE: -121.773650 * SOUTH-BOUND LATITUDE: 0.318500 * WEST-BOUND LONGITUDE: 159.361000 * NORTH-BOUND LATITUDE: 3.719017 * EAST-BOUND LONGITUDE: -42.908300 * DATE/TIME START: 1990-02-17T00:00:00 * DATE/TIME END: 1994-02-27T00:00:00 2020 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.913906 https://doi.org/10.1594/PANGAEA.913906 en eng PANGAEA Lear, Caroline H; Rosenthal, Yair; Wright, James D (2003): The closing of a seaway: ocean water masses and global climate change. Earth and Planetary Science Letters, 210(3-4), 425-436, https://doi.org/10.1016/S0012-821X(03)00164-X Bickert, Torsten; Berger, Wolfgang H; Burke, S; Schmidt, Heike; Wefer, Gerold (1993): Late Quaternary stable isotope record of benthic foraminifers: Site 805 and 806, Ontong Java Plateau. In: Berger, WH; Kroenke, LW; Mayer, LA; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 130, 411-420, https://doi.org/10.2973/odp.proc.sr.130.025.1993 Shackleton, Nicholas J; Hall, Michael A (1997): The Late Miocene stable isotope record, Site 926. In: Shackleton, N.J., Curry, W.B., Richter, C., and Bralower, T.J. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 154, 367-373, https://doi.org/10.2973/odp.proc.sr.154.119.1997 https://doi.pangaea.de/10.1594/PANGAEA.913906 https://doi.org/10.1594/PANGAEA.913906 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess Benthic foraminifera Mg/Ca North Atlantic Deep Water ocean drilling program ocean gateway ODP dataset publication series 2020 ftpangaea https://doi.org/10.1594/PANGAEA.91390610.1016/S0012-821X(03)00164-X10.2973/odp.proc.sr.130.025.199310.2973/odp.proc.sr.154.119.1997 2024-07-24T02:31:21Z The Late Neogene witnessed various major paleoceanographic changes that culminated in intense Northern Hemisphere Glaciation (NHG). The cause and effects of these changes are still debated. We use a multiproxy approach to determine the relative timing of the closure of the Panama gateway, changes in Atlantic circulation, global cooling and ice sheet growth. Benthic foraminiferal Mg/Ca records from a Pacific and an Atlantic Site have been produced and are interpreted in terms of bottom water temperatures. These Mg-temperature records are combined with published benthic d13C, N18O and erosion records to reconstruct the flow of proto-North Atlantic Deep Water (proto-NADW) over the past 12 Ma. The results suggest that between 12.5and 10.5 Ma, and again between about 8.5 and 6 Ma, a nutrient-depleted water mass that was colder (by 1-2˚C) and fresher than the intervening deep water mass filled the Atlantic basin. This proto-NADW became warmer (by ~1˚C) and saltier between 6 and 5Ma, coincident with the restriction of surface water flow through the Central American Seaway. The Mg-temperature records define a subsequent global cooling trend of~3.5˚C between 5 Ma and today. Early NHG in the late Miocene was perhaps related to the formation of the relatively cold, fresh proto-NADW. The formation of the warmer and saltier proto-NADW in the early Pliocene may have initially limited Northern Hemisphere ice growth. However, the increased moisture released at high northern latitudes associated with formation of 'warm' proto-NADW, coupled with the global temperature decrease of deep (and hence polar surface) waters, likely helped initiate the intense NHG of the Plio-Pleistocene. Other/Unknown Material Ice Sheet NADW North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(159.361000,-42.908300,3.719017,0.318500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Benthic foraminifera Mg/Ca North Atlantic Deep Water ocean drilling program ocean gateway ODP |
spellingShingle |
Benthic foraminifera Mg/Ca North Atlantic Deep Water ocean drilling program ocean gateway ODP Lear, Caroline H Rosenthal, Yair Wright, James D Atlantic and Pacific benthic Mg/Ca temperatures 0-12 Ma |
topic_facet |
Benthic foraminifera Mg/Ca North Atlantic Deep Water ocean drilling program ocean gateway ODP |
description |
The Late Neogene witnessed various major paleoceanographic changes that culminated in intense Northern Hemisphere Glaciation (NHG). The cause and effects of these changes are still debated. We use a multiproxy approach to determine the relative timing of the closure of the Panama gateway, changes in Atlantic circulation, global cooling and ice sheet growth. Benthic foraminiferal Mg/Ca records from a Pacific and an Atlantic Site have been produced and are interpreted in terms of bottom water temperatures. These Mg-temperature records are combined with published benthic d13C, N18O and erosion records to reconstruct the flow of proto-North Atlantic Deep Water (proto-NADW) over the past 12 Ma. The results suggest that between 12.5and 10.5 Ma, and again between about 8.5 and 6 Ma, a nutrient-depleted water mass that was colder (by 1-2˚C) and fresher than the intervening deep water mass filled the Atlantic basin. This proto-NADW became warmer (by ~1˚C) and saltier between 6 and 5Ma, coincident with the restriction of surface water flow through the Central American Seaway. The Mg-temperature records define a subsequent global cooling trend of~3.5˚C between 5 Ma and today. Early NHG in the late Miocene was perhaps related to the formation of the relatively cold, fresh proto-NADW. The formation of the warmer and saltier proto-NADW in the early Pliocene may have initially limited Northern Hemisphere ice growth. However, the increased moisture released at high northern latitudes associated with formation of 'warm' proto-NADW, coupled with the global temperature decrease of deep (and hence polar surface) waters, likely helped initiate the intense NHG of the Plio-Pleistocene. |
format |
Other/Unknown Material |
author |
Lear, Caroline H Rosenthal, Yair Wright, James D |
author_facet |
Lear, Caroline H Rosenthal, Yair Wright, James D |
author_sort |
Lear, Caroline H |
title |
Atlantic and Pacific benthic Mg/Ca temperatures 0-12 Ma |
title_short |
Atlantic and Pacific benthic Mg/Ca temperatures 0-12 Ma |
title_full |
Atlantic and Pacific benthic Mg/Ca temperatures 0-12 Ma |
title_fullStr |
Atlantic and Pacific benthic Mg/Ca temperatures 0-12 Ma |
title_full_unstemmed |
Atlantic and Pacific benthic Mg/Ca temperatures 0-12 Ma |
title_sort |
atlantic and pacific benthic mg/ca temperatures 0-12 ma |
publisher |
PANGAEA |
publishDate |
2020 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.913906 https://doi.org/10.1594/PANGAEA.913906 |
op_coverage |
MEDIAN LATITUDE: 2.018821 * MEDIAN LONGITUDE: -121.773650 * SOUTH-BOUND LATITUDE: 0.318500 * WEST-BOUND LONGITUDE: 159.361000 * NORTH-BOUND LATITUDE: 3.719017 * EAST-BOUND LONGITUDE: -42.908300 * DATE/TIME START: 1990-02-17T00:00:00 * DATE/TIME END: 1994-02-27T00:00:00 |
long_lat |
ENVELOPE(159.361000,-42.908300,3.719017,0.318500) |
genre |
Ice Sheet NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Ice Sheet NADW North Atlantic Deep Water North Atlantic |
op_relation |
Lear, Caroline H; Rosenthal, Yair; Wright, James D (2003): The closing of a seaway: ocean water masses and global climate change. Earth and Planetary Science Letters, 210(3-4), 425-436, https://doi.org/10.1016/S0012-821X(03)00164-X Bickert, Torsten; Berger, Wolfgang H; Burke, S; Schmidt, Heike; Wefer, Gerold (1993): Late Quaternary stable isotope record of benthic foraminifers: Site 805 and 806, Ontong Java Plateau. In: Berger, WH; Kroenke, LW; Mayer, LA; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 130, 411-420, https://doi.org/10.2973/odp.proc.sr.130.025.1993 Shackleton, Nicholas J; Hall, Michael A (1997): The Late Miocene stable isotope record, Site 926. In: Shackleton, N.J., Curry, W.B., Richter, C., and Bralower, T.J. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 154, 367-373, https://doi.org/10.2973/odp.proc.sr.154.119.1997 https://doi.pangaea.de/10.1594/PANGAEA.913906 https://doi.org/10.1594/PANGAEA.913906 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.91390610.1016/S0012-821X(03)00164-X10.2973/odp.proc.sr.130.025.199310.2973/odp.proc.sr.154.119.1997 |
_version_ |
1810450146702393344 |