Document Detail


Oxygen-18 of O2 records the impact of abrupt climate change on the terrestrial biosphere.
MedLine Citation:
PMID:  19520957     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Photosynthesis and respiration occur widely on Earth's surface, and the 18O/16O ratio of the oxygen produced and consumed varies with climatic conditions. As a consequence, the history of climate is reflected in the deviation of the 18O/16O of air (delta18Oatm) from seawater delta18O (known as the Dole effect). We report variations in delta18Oatm over the past 60,000 years related to Heinrich and Dansgaard-Oeschger events, two modes of abrupt climate change observed during the last ice age. Correlations with cave records support the hypothesis that the Dole effect is primarily governed by the strength of the Asian and North African monsoons and confirm that widespread changes in low-latitude terrestrial rainfall accompanied abrupt climate change. The rapid delta18Oatm changes can also be used to synchronize ice records by providing global time markers.
Authors:
Jeffrey P Severinghaus; Ross Beaudette; Melissa A Headly; Kendrick Taylor; Edward J Brook
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  324     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-06-12     Completed Date:  2009-06-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1431-4     Citation Subset:  IM    
Affiliation:
Scripps Institution of Oceanography, University of California, San Diego, CA 92093-0244, USA. jseveringhaus@ucsd.edu
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MeSH Terms
Descriptor/Qualifier:
Antarctic Regions
Atmosphere / chemistry*
Climatic Processes*
Ecosystem*
Ice Cover / chemistry*
Oxygen / analysis*
Oxygen Isotopes / analysis*
Photosynthesis
Rain
Seawater / chemistry
Time
Chemical
Reg. No./Substance:
0/Oxygen Isotopes; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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