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A possible 20th-century slowdown of southern ocean deep water formation
MedLine Citation:
PMID:  10550046     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Chlorofluorocarbon-11 inventories for the deep Southern Ocean appear to confirm physical oceanographic and geochemical studies in the Southern Ocean, which suggest that no more than 5 x 10(6) cubic meters per second of ventilated deep water is currently being produced. This result conflicts with conclusions based on the distributions of the carbon-14/carbon ratio and a quasi-conservative property, PO(4)(*), in the deep sea, which seem to require an average of about 15 x 10(6) cubic meters per second of Southern Ocean deep ventilation over about the past 800 years. A major reduction in Southern Ocean deep water production during the 20th century (from high rates during the Little Ice Age) may explain this apparent discordance. If this is true, a seesawing of deep water production between the northern Atlantic and Southern oceans may lie at the heart of the 1500-year ice-rafting cycle.
Authors:
Broecker; Sutherland; Peng
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  286     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  1999 Nov 
Date Detail:
Created Date:  1999-11-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  UNITED STATES    
Other Details:
Languages:  Eng     Pagination:  1132-5     Citation Subset:  -    
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA. Ocean Chemistry Division, Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration, Miami, FL 33149-1026, USA.
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