Does δ18O of O2 record meridional shifts in tropical rainfall?
Marine sediments, speleothems, paleo-lake elevations, and ice core methane and δ18O of O2 (δ18Oatm) records provide ample evidence for repeated abrupt meridional shifts in tropical rainfall belts throughout the last glacial cycle. To improve understanding of the impact of abrupt events on the global...
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Copernicus Publications
2017
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00008424 2023-05-15T13:34:49+02:00 Does δ18O of O2 record meridional shifts in tropical rainfall? Seltzer, Alan M. Buizert, Christo Baggenstos, Daniel Brook, Edward J. Ahn, Jinho Yang, Ji-Woong Severinghaus, Jeffrey P. 2017-10 electronic https://doi.org/10.5194/cp-13-1323-2017 https://noa.gwlb.de/receive/cop_mods_00008424 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008381/cp-13-1323-2017.pdf https://cp.copernicus.org/articles/13/1323/2017/cp-13-1323-2017.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-13-1323-2017 https://noa.gwlb.de/receive/cop_mods_00008424 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008381/cp-13-1323-2017.pdf https://cp.copernicus.org/articles/13/1323/2017/cp-13-1323-2017.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/cp-13-1323-2017 2022-02-08T22:58:02Z Marine sediments, speleothems, paleo-lake elevations, and ice core methane and δ18O of O2 (δ18Oatm) records provide ample evidence for repeated abrupt meridional shifts in tropical rainfall belts throughout the last glacial cycle. To improve understanding of the impact of abrupt events on the global terrestrial biosphere, we present composite records of δ18Oatm and inferred changes in fractionation by the global terrestrial biosphere (ΔεLAND) from discrete gas measurements in the WAIS Divide (WD) and Siple Dome (SD) Antarctic ice cores. On the common WD timescale, it is evident that maxima in ΔεLAND are synchronous with or shortly follow small-amplitude WD CH4 peaks that occur within Heinrich stadials 1, 2, 4, and 5 – periods of low atmospheric CH4 concentrations. These local CH4 maxima have been suggested as markers of abrupt climate responses to Heinrich events. Based on our analysis of the modern seasonal cycle of gross primary productivity (GPP)-weighted δ18O of terrestrial precipitation (the source water for atmospheric O2 production), we propose a simple mechanism by which ΔεLAND tracks the centroid latitude of terrestrial oxygen production. As intense rainfall and oxygen production migrate northward, ΔεLAND should decrease due to the underlying meridional gradient in rainfall δ18O. A southward shift should increase ΔεLAND. Monsoon intensity also influences δ18O of precipitation, and although we cannot determine the relative contributions of the two mechanisms, both act in the same direction. Therefore, we suggest that abrupt increases in ΔεLAND unambiguously imply a southward shift of tropical rainfall. The exact magnitude of this shift, however, remains under-constrained by ΔεLAND. Article in Journal/Newspaper Antarc* Antarctic ice core Niedersächsisches Online-Archiv NOA Antarctic Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Dome ENVELOPE(-148.833,-148.833,-81.667,-81.667) Climate of the Past 13 10 1323 1338 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Seltzer, Alan M. Buizert, Christo Baggenstos, Daniel Brook, Edward J. Ahn, Jinho Yang, Ji-Woong Severinghaus, Jeffrey P. Does δ18O of O2 record meridional shifts in tropical rainfall? |
topic_facet |
article Verlagsveröffentlichung |
description |
Marine sediments, speleothems, paleo-lake elevations, and ice core methane and δ18O of O2 (δ18Oatm) records provide ample evidence for repeated abrupt meridional shifts in tropical rainfall belts throughout the last glacial cycle. To improve understanding of the impact of abrupt events on the global terrestrial biosphere, we present composite records of δ18Oatm and inferred changes in fractionation by the global terrestrial biosphere (ΔεLAND) from discrete gas measurements in the WAIS Divide (WD) and Siple Dome (SD) Antarctic ice cores. On the common WD timescale, it is evident that maxima in ΔεLAND are synchronous with or shortly follow small-amplitude WD CH4 peaks that occur within Heinrich stadials 1, 2, 4, and 5 – periods of low atmospheric CH4 concentrations. These local CH4 maxima have been suggested as markers of abrupt climate responses to Heinrich events. Based on our analysis of the modern seasonal cycle of gross primary productivity (GPP)-weighted δ18O of terrestrial precipitation (the source water for atmospheric O2 production), we propose a simple mechanism by which ΔεLAND tracks the centroid latitude of terrestrial oxygen production. As intense rainfall and oxygen production migrate northward, ΔεLAND should decrease due to the underlying meridional gradient in rainfall δ18O. A southward shift should increase ΔεLAND. Monsoon intensity also influences δ18O of precipitation, and although we cannot determine the relative contributions of the two mechanisms, both act in the same direction. Therefore, we suggest that abrupt increases in ΔεLAND unambiguously imply a southward shift of tropical rainfall. The exact magnitude of this shift, however, remains under-constrained by ΔεLAND. |
format |
Article in Journal/Newspaper |
author |
Seltzer, Alan M. Buizert, Christo Baggenstos, Daniel Brook, Edward J. Ahn, Jinho Yang, Ji-Woong Severinghaus, Jeffrey P. |
author_facet |
Seltzer, Alan M. Buizert, Christo Baggenstos, Daniel Brook, Edward J. Ahn, Jinho Yang, Ji-Woong Severinghaus, Jeffrey P. |
author_sort |
Seltzer, Alan M. |
title |
Does δ18O of O2 record meridional shifts in tropical rainfall? |
title_short |
Does δ18O of O2 record meridional shifts in tropical rainfall? |
title_full |
Does δ18O of O2 record meridional shifts in tropical rainfall? |
title_fullStr |
Does δ18O of O2 record meridional shifts in tropical rainfall? |
title_full_unstemmed |
Does δ18O of O2 record meridional shifts in tropical rainfall? |
title_sort |
does δ18o of o2 record meridional shifts in tropical rainfall? |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/cp-13-1323-2017 https://noa.gwlb.de/receive/cop_mods_00008424 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008381/cp-13-1323-2017.pdf https://cp.copernicus.org/articles/13/1323/2017/cp-13-1323-2017.pdf |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-148.833,-148.833,-81.667,-81.667) |
geographic |
Antarctic Siple Siple Dome |
geographic_facet |
Antarctic Siple Siple Dome |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-13-1323-2017 https://noa.gwlb.de/receive/cop_mods_00008424 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00008381/cp-13-1323-2017.pdf https://cp.copernicus.org/articles/13/1323/2017/cp-13-1323-2017.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-13-1323-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
10 |
container_start_page |
1323 |
op_container_end_page |
1338 |
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1766058015545360384 |