Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle
Pptn. changes in the western tropical Atlantic over the past 180,000 years are reconstructed using the stable carbon and deuterium isotopic compns. of higher plant leaf waxes preserved in Cariaco Basin sediments. Results indicate that less (more) pptn. fell over northern South America during stadial...
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ftcaltechauth:oai:authors.library.caltech.edu:46216 2023-05-15T17:32:25+02:00 Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle Drenzek, Nicholas J. Hughen, Konrad A. Sessions, Alex L. Bice, Marley B. Eglinton, Timothy I. 2007-08 https://authors.library.caltech.edu/46216/ https://resolver.caltech.edu/CaltechAUTHORS:20140611-135917297 unknown Drenzek, Nicholas J. and Hughen, Konrad A. and Sessions, Alex L. and Bice, Marley B. and Eglinton, Timothy I. (2007) Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle. In: 234th ACS National Meeting & Exposition, August 19-23, 2007, Boston, MA. https://resolver.caltech.edu/CaltechAUTHORS:20140611-135917297 <https://resolver.caltech.edu/CaltechAUTHORS:20140611-135917297> Conference or Workshop Item PeerReviewed 2007 ftcaltechauth 2020-04-26T16:43:28Z Pptn. changes in the western tropical Atlantic over the past 180,000 years are reconstructed using the stable carbon and deuterium isotopic compns. of higher plant leaf waxes preserved in Cariaco Basin sediments. Results indicate that less (more) pptn. fell over northern South America during stadial (interstadial) periods relative to today. Moreover, this trend is highly modulated by precessionally driven oscillations in Nov. insolation, such that dry events concurrent with periods of increased solar heating were less arid than those occurring when that heating was diminished (and visa versa). Together, these findings suggest that the duration of the seasonal displacement of the Intertropical Convergence Zone (ITCZ) was modified in response to changes in both the high latitude North Atlantic (presumably due to variations in the rate of meridional overturning circulation) and tropical insolation during the last glacial cycle, thus establishing an important link between seasonality and abrupt climate change. Conference Object North Atlantic Caltech Authors (California Institute of Technology) |
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Open Polar |
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Caltech Authors (California Institute of Technology) |
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description |
Pptn. changes in the western tropical Atlantic over the past 180,000 years are reconstructed using the stable carbon and deuterium isotopic compns. of higher plant leaf waxes preserved in Cariaco Basin sediments. Results indicate that less (more) pptn. fell over northern South America during stadial (interstadial) periods relative to today. Moreover, this trend is highly modulated by precessionally driven oscillations in Nov. insolation, such that dry events concurrent with periods of increased solar heating were less arid than those occurring when that heating was diminished (and visa versa). Together, these findings suggest that the duration of the seasonal displacement of the Intertropical Convergence Zone (ITCZ) was modified in response to changes in both the high latitude North Atlantic (presumably due to variations in the rate of meridional overturning circulation) and tropical insolation during the last glacial cycle, thus establishing an important link between seasonality and abrupt climate change. |
format |
Conference Object |
author |
Drenzek, Nicholas J. Hughen, Konrad A. Sessions, Alex L. Bice, Marley B. Eglinton, Timothy I. |
spellingShingle |
Drenzek, Nicholas J. Hughen, Konrad A. Sessions, Alex L. Bice, Marley B. Eglinton, Timothy I. Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle |
author_facet |
Drenzek, Nicholas J. Hughen, Konrad A. Sessions, Alex L. Bice, Marley B. Eglinton, Timothy I. |
author_sort |
Drenzek, Nicholas J. |
title |
Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle |
title_short |
Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle |
title_full |
Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle |
title_fullStr |
Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle |
title_full_unstemmed |
Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle |
title_sort |
western atlantic intertropical convergence zone variability over the last full glacial cycle |
publishDate |
2007 |
url |
https://authors.library.caltech.edu/46216/ https://resolver.caltech.edu/CaltechAUTHORS:20140611-135917297 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Drenzek, Nicholas J. and Hughen, Konrad A. and Sessions, Alex L. and Bice, Marley B. and Eglinton, Timothy I. (2007) Western Atlantic Intertropical Convergence Zone variability over the last full glacial cycle. In: 234th ACS National Meeting & Exposition, August 19-23, 2007, Boston, MA. https://resolver.caltech.edu/CaltechAUTHORS:20140611-135917297 <https://resolver.caltech.edu/CaltechAUTHORS:20140611-135917297> |
_version_ |
1766130549795061760 |