Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic
Carbon isotopic records of nutrient-depleted surface water place constraints on the past fertility of the oceans and on past atmospheric pCO2 levels. The best records of nutrient-depleted delta13C are obtained from planktonic foraminifera living in the thick mixed layers of the western equatorial an...
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1987
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.692012 2024-09-15T18:12:05+00:00 Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic Curry, William B Crowley, Thomas J MEDIAN LATITUDE: 12.019257 * MEDIAN LONGITUDE: -39.230410 * SOUTH-BOUND LATITUDE: 4.337000 * WEST-BOUND LONGITUDE: -79.378200 * NORTH-BOUND LATITUDE: 26.400000 * EAST-BOUND LONGITUDE: -19.851667 * DATE/TIME START: 1968-01-21T00:00:00 * DATE/TIME END: 1984-11-08T00:00:00 1987 application/zip, 10 datasets https://doi.pangaea.de/10.1594/PANGAEA.692012 https://doi.org/10.1594/PANGAEA.692012 en eng PANGAEA Curry, William B; Crowley, Thomas J (1987): The d13C of equatorial Atlantic surface waters: implications for ice age pCO2 levels. Paleoceanography, 2(5), 489-517, https://doi.org/10.1029/PA002i005p00489 Imbrie, John D; McIntyre, Andrew; Mix, Alan C (1989): Oceanic response to orbital forcing in the late Quaternary: observational and experimental strategies. In: Berger, A; Schneider, S H & Duplessy, J C (eds.), Climate and Geosciences, A Challenge for Science and Society in the 21th Century. Boston (Kluwer Academic), 121-164, https://doi.org/10.1007/978-94-009-2446-8_7 https://doi.pangaea.de/10.1594/PANGAEA.692012 https://doi.org/10.1594/PANGAEA.692012 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: McIntyre, Andrew; Ruddiman, William F; Karlin, K; Mix, Alan C (1989): Surface water response of the Equatorial Atlantic Ocean to orbital forcing. Paleoceanography, 4(1), 19-55, https://doi.org/10.1029/PA004i001p00019 0038PG 0082PG 68-502B Atlantic Ocean Calculation Caribbean Sea/RIDGE Curry_crowley_stack Deep Sea Drilling Project DRILL Drilling/drill rig DSDP EN06601 EN066-38PG Endeavor FGGE-Equator 79 - First GARP Global Experiment GC GIK13519-1 Glomar Challenger Gravity corer Gravity corer (Kiel type) INT KN11002 KN11002-0043 Knorr KNR110-82 KNR110-82a KNR110-82GGC Leg68 M51 Meteor (1964) PC Piston corer SL SPECMAP Spectral Mapping Project (Mapping Species Variability in Global Climate) V25 V25-21 Vema dataset publication series 1987 ftpangaea https://doi.org/10.1594/PANGAEA.69201210.1029/PA004i001p0001910.1029/PA002i005p00489 2024-07-24T02:31:42Z Carbon isotopic records of nutrient-depleted surface water place constraints on the past fertility of the oceans and on past atmospheric pCO2 levels. The best records of nutrient-depleted delta13C are obtained from planktonic foraminifera living in the thick mixed layers of the western equatorial and tropical Atlantic Ocean. We have produced a composite, stacked Globigerinoides sacculifer delta13C record from the equatorial Atlantic, which exhibits significant spectral power at the 100,000- and 41,000-year Milankovitch periods, but no power at the 23,000-year period. Similar to the record presented by Shackleton and Pisias [1985], surface-deep ocean Delta delta13C produced with the G. sacculifer record leads the delta18O ice volume record. However, the glacial-interglacial amplitudes of Delta delta13C differ between our record and Shackleton and Pisias [1985] record. Although large changes in Delta delta13C occur in the equatorial Atlantic during early stages of the last three glacial cycles, surface-deep Delta delta13C at glacial maxima (18O stage 2, late stage 6, and late stage 8) was only about 0.2‰ greater than during the subsequent interglacial. Our results imply that nutrient-driven pCO2 changes account for about one third of the pCO2 decrease observed in ice cores, and consequently, Delta delta13C should not be used as a proxy pCO2 index. Enough variance in the ice core pCO2 records remains to be explained that conclusions about pCO2 and ice volume phase relationships should also be reexamined. As much as 40 ppm pCO2 change still has not been accounted for by models of past physics and chemistry of the ocean. Other/Unknown Material ice core Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-79.378200,-19.851667,26.400000,4.337000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
0038PG 0082PG 68-502B Atlantic Ocean Calculation Caribbean Sea/RIDGE Curry_crowley_stack Deep Sea Drilling Project DRILL Drilling/drill rig DSDP EN06601 EN066-38PG Endeavor FGGE-Equator 79 - First GARP Global Experiment GC GIK13519-1 Glomar Challenger Gravity corer Gravity corer (Kiel type) INT KN11002 KN11002-0043 Knorr KNR110-82 KNR110-82a KNR110-82GGC Leg68 M51 Meteor (1964) PC Piston corer SL SPECMAP Spectral Mapping Project (Mapping Species Variability in Global Climate) V25 V25-21 Vema |
spellingShingle |
0038PG 0082PG 68-502B Atlantic Ocean Calculation Caribbean Sea/RIDGE Curry_crowley_stack Deep Sea Drilling Project DRILL Drilling/drill rig DSDP EN06601 EN066-38PG Endeavor FGGE-Equator 79 - First GARP Global Experiment GC GIK13519-1 Glomar Challenger Gravity corer Gravity corer (Kiel type) INT KN11002 KN11002-0043 Knorr KNR110-82 KNR110-82a KNR110-82GGC Leg68 M51 Meteor (1964) PC Piston corer SL SPECMAP Spectral Mapping Project (Mapping Species Variability in Global Climate) V25 V25-21 Vema Curry, William B Crowley, Thomas J Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic |
topic_facet |
0038PG 0082PG 68-502B Atlantic Ocean Calculation Caribbean Sea/RIDGE Curry_crowley_stack Deep Sea Drilling Project DRILL Drilling/drill rig DSDP EN06601 EN066-38PG Endeavor FGGE-Equator 79 - First GARP Global Experiment GC GIK13519-1 Glomar Challenger Gravity corer Gravity corer (Kiel type) INT KN11002 KN11002-0043 Knorr KNR110-82 KNR110-82a KNR110-82GGC Leg68 M51 Meteor (1964) PC Piston corer SL SPECMAP Spectral Mapping Project (Mapping Species Variability in Global Climate) V25 V25-21 Vema |
description |
Carbon isotopic records of nutrient-depleted surface water place constraints on the past fertility of the oceans and on past atmospheric pCO2 levels. The best records of nutrient-depleted delta13C are obtained from planktonic foraminifera living in the thick mixed layers of the western equatorial and tropical Atlantic Ocean. We have produced a composite, stacked Globigerinoides sacculifer delta13C record from the equatorial Atlantic, which exhibits significant spectral power at the 100,000- and 41,000-year Milankovitch periods, but no power at the 23,000-year period. Similar to the record presented by Shackleton and Pisias [1985], surface-deep ocean Delta delta13C produced with the G. sacculifer record leads the delta18O ice volume record. However, the glacial-interglacial amplitudes of Delta delta13C differ between our record and Shackleton and Pisias [1985] record. Although large changes in Delta delta13C occur in the equatorial Atlantic during early stages of the last three glacial cycles, surface-deep Delta delta13C at glacial maxima (18O stage 2, late stage 6, and late stage 8) was only about 0.2‰ greater than during the subsequent interglacial. Our results imply that nutrient-driven pCO2 changes account for about one third of the pCO2 decrease observed in ice cores, and consequently, Delta delta13C should not be used as a proxy pCO2 index. Enough variance in the ice core pCO2 records remains to be explained that conclusions about pCO2 and ice volume phase relationships should also be reexamined. As much as 40 ppm pCO2 change still has not been accounted for by models of past physics and chemistry of the ocean. |
format |
Other/Unknown Material |
author |
Curry, William B Crowley, Thomas J |
author_facet |
Curry, William B Crowley, Thomas J |
author_sort |
Curry, William B |
title |
Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic |
title_short |
Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic |
title_full |
Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic |
title_fullStr |
Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic |
title_full_unstemmed |
Stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial Atlantic |
title_sort |
stable carbon and oxygen isotope ratios of planktonic foraminifera from the equatorial atlantic |
publisher |
PANGAEA |
publishDate |
1987 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.692012 https://doi.org/10.1594/PANGAEA.692012 |
op_coverage |
MEDIAN LATITUDE: 12.019257 * MEDIAN LONGITUDE: -39.230410 * SOUTH-BOUND LATITUDE: 4.337000 * WEST-BOUND LONGITUDE: -79.378200 * NORTH-BOUND LATITUDE: 26.400000 * EAST-BOUND LONGITUDE: -19.851667 * DATE/TIME START: 1968-01-21T00:00:00 * DATE/TIME END: 1984-11-08T00:00:00 |
long_lat |
ENVELOPE(-79.378200,-19.851667,26.400000,4.337000) |
genre |
ice core Planktonic foraminifera |
genre_facet |
ice core Planktonic foraminifera |
op_source |
Supplement to: McIntyre, Andrew; Ruddiman, William F; Karlin, K; Mix, Alan C (1989): Surface water response of the Equatorial Atlantic Ocean to orbital forcing. Paleoceanography, 4(1), 19-55, https://doi.org/10.1029/PA004i001p00019 |
op_relation |
Curry, William B; Crowley, Thomas J (1987): The d13C of equatorial Atlantic surface waters: implications for ice age pCO2 levels. Paleoceanography, 2(5), 489-517, https://doi.org/10.1029/PA002i005p00489 Imbrie, John D; McIntyre, Andrew; Mix, Alan C (1989): Oceanic response to orbital forcing in the late Quaternary: observational and experimental strategies. In: Berger, A; Schneider, S H & Duplessy, J C (eds.), Climate and Geosciences, A Challenge for Science and Society in the 21th Century. Boston (Kluwer Academic), 121-164, https://doi.org/10.1007/978-94-009-2446-8_7 https://doi.pangaea.de/10.1594/PANGAEA.692012 https://doi.org/10.1594/PANGAEA.692012 |
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.69201210.1029/PA004i001p0001910.1029/PA002i005p00489 |
_version_ |
1810449673180151808 |