Links between iron supply, marine productivity, sea surface temperature and CO2 over the last 1.1 Ma
Paleoclimatic reconstructions have provided a unique data set to test the sensitivity of climate system to changes in atmospheric CO2 concentrations. However, the mechanisms behind glacial/interglacial (G/IG) variations in atmospheric CO2 concentrations observed in the Antarctic ice cores are still...
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ftuabarcelonapb:oai:ddd.uab.cat:25429 2023-05-15T13:49:48+02:00 Links between iron supply, marine productivity, sea surface temperature and CO2 over the last 1.1 Ma Martínez García, Alfredo Rosell Melé, Antoni Geibert, Walter Gersonde, Rainer Masqué Barri, Pere Gaspari, Vania Barbante, Carlo 2009 application/pdf https://ddd.uab.cat/record/25429 eng eng Paleoceanography Vol. 24, Issue 1 (March 2009), p. PA1207 https://ddd.uab.cat/record/25429 urn:10.1029/2008PA001657 urn:oai:ddd.uab.cat:25429 urn:recercauab:ARE-45631 urn:scopus_id:67649210320 urn:wos_id:000263331600002 urn:oai:egreta.uab.cat:publications/c23d4eb4-50f8-4eee-9ab4-7ea59cf31c54 urn:articleid:19449186v24n1PA1207 open access Tots els drets reservats. https://rightsstatements.org/vocab/InC/1.0/ Southern Ocean Iron fertilization Dust Greenhouse gases Article 2009 ftuabarcelonapb 2023-02-06T20:44:59Z Paleoclimatic reconstructions have provided a unique data set to test the sensitivity of climate system to changes in atmospheric CO2 concentrations. However, the mechanisms behind glacial/interglacial (G/IG) variations in atmospheric CO2 concentrations observed in the Antarctic ice cores are still not fully understood. Here we present a new multiproxy data set of sea surface temperatures (SST), dust and iron supply, and marine export productivity, from the marine sediment core PS2489-2/ODP Site 1090 located in the subantarctic Atlantic, that allow us to evaluate various hypotheses on the role of the Southern Ocean (SO) in modulating atmospheric CO2 concentrations back to 1.1 Ma. We show that Antarctic atmospheric temperatures are closely linked to changes in SO surface temperatures over the last 800 ka and use this to synchronize the timescales of our marine and the European Project for Ice Coring in Antarctica (EPICA) Dome C (EDC) records. The close correlation observed between iron inputs and marine export production over the entire interval implies that the process of iron fertilization of marine biota has been a recurrent process operating in the subantarctic region over the G/IG cycles of the last 1.1 Ma. However, our data suggest that marine productivity can only explain a fraction of atmospheric CO2 changes (up to around 40-50 ppmv), ccurring at glacial maxima in each glacial stage. In this sense, the good correlation of our SST record to the EDC temperature reconstruction suggests that the initial glacial CO2 decrease, as well as the change in the amplitude of the CO2 cycles observed around 400 ka, was most likely driven by physical processes, possibly related to changes in Antarctic sea ice extent, surface water stratification, and westerly winds position. Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA Sea ice Southern Ocean Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB Antarctic Southern Ocean The Antarctic Paleoceanography 24 1 n/a n/a |
institution |
Open Polar |
collection |
Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB |
op_collection_id |
ftuabarcelonapb |
language |
English |
topic |
Southern Ocean Iron fertilization Dust Greenhouse gases |
spellingShingle |
Southern Ocean Iron fertilization Dust Greenhouse gases Martínez García, Alfredo Rosell Melé, Antoni Geibert, Walter Gersonde, Rainer Masqué Barri, Pere Gaspari, Vania Barbante, Carlo Links between iron supply, marine productivity, sea surface temperature and CO2 over the last 1.1 Ma |
topic_facet |
Southern Ocean Iron fertilization Dust Greenhouse gases |
description |
Paleoclimatic reconstructions have provided a unique data set to test the sensitivity of climate system to changes in atmospheric CO2 concentrations. However, the mechanisms behind glacial/interglacial (G/IG) variations in atmospheric CO2 concentrations observed in the Antarctic ice cores are still not fully understood. Here we present a new multiproxy data set of sea surface temperatures (SST), dust and iron supply, and marine export productivity, from the marine sediment core PS2489-2/ODP Site 1090 located in the subantarctic Atlantic, that allow us to evaluate various hypotheses on the role of the Southern Ocean (SO) in modulating atmospheric CO2 concentrations back to 1.1 Ma. We show that Antarctic atmospheric temperatures are closely linked to changes in SO surface temperatures over the last 800 ka and use this to synchronize the timescales of our marine and the European Project for Ice Coring in Antarctica (EPICA) Dome C (EDC) records. The close correlation observed between iron inputs and marine export production over the entire interval implies that the process of iron fertilization of marine biota has been a recurrent process operating in the subantarctic region over the G/IG cycles of the last 1.1 Ma. However, our data suggest that marine productivity can only explain a fraction of atmospheric CO2 changes (up to around 40-50 ppmv), ccurring at glacial maxima in each glacial stage. In this sense, the good correlation of our SST record to the EDC temperature reconstruction suggests that the initial glacial CO2 decrease, as well as the change in the amplitude of the CO2 cycles observed around 400 ka, was most likely driven by physical processes, possibly related to changes in Antarctic sea ice extent, surface water stratification, and westerly winds position. |
format |
Article in Journal/Newspaper |
author |
Martínez García, Alfredo Rosell Melé, Antoni Geibert, Walter Gersonde, Rainer Masqué Barri, Pere Gaspari, Vania Barbante, Carlo |
author_facet |
Martínez García, Alfredo Rosell Melé, Antoni Geibert, Walter Gersonde, Rainer Masqué Barri, Pere Gaspari, Vania Barbante, Carlo |
author_sort |
Martínez García, Alfredo |
title |
Links between iron supply, marine productivity, sea surface temperature and CO2 over the last 1.1 Ma |
title_short |
Links between iron supply, marine productivity, sea surface temperature and CO2 over the last 1.1 Ma |
title_full |
Links between iron supply, marine productivity, sea surface temperature and CO2 over the last 1.1 Ma |
title_fullStr |
Links between iron supply, marine productivity, sea surface temperature and CO2 over the last 1.1 Ma |
title_full_unstemmed |
Links between iron supply, marine productivity, sea surface temperature and CO2 over the last 1.1 Ma |
title_sort |
links between iron supply, marine productivity, sea surface temperature and co2 over the last 1.1 ma |
publishDate |
2009 |
url |
https://ddd.uab.cat/record/25429 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica EPICA Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica EPICA Sea ice Southern Ocean |
op_relation |
Paleoceanography Vol. 24, Issue 1 (March 2009), p. PA1207 https://ddd.uab.cat/record/25429 urn:10.1029/2008PA001657 urn:oai:ddd.uab.cat:25429 urn:recercauab:ARE-45631 urn:scopus_id:67649210320 urn:wos_id:000263331600002 urn:oai:egreta.uab.cat:publications/c23d4eb4-50f8-4eee-9ab4-7ea59cf31c54 urn:articleid:19449186v24n1PA1207 |
op_rights |
open access Tots els drets reservats. https://rightsstatements.org/vocab/InC/1.0/ |
container_title |
Paleoceanography |
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24 |
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1 |
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1766252303646457856 |