Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation

During the last deglaciation (ca. 21-10 ka), freshening of the North Atlantic surface likely caused reductions in Atlantic meridional overturning circulation (AMOC); the mechanisms related to AMOC recovery remain poorly understood. Here we present three new deglacial surface temperature and ... (......

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Bibliographic Details
Published in:Geology (Boulder) 2008-12, Vol.36 (12), p.991-994
Main Authors: Carlson, Anders E, Oppo, Delia W, Came, Rosemarie E, LeGrande, Allegra N, Keigwin, Lloyd D, Curry, William B
Format: Article
Language:English
Subjects:
alkaline earth metals
Arctic region
Atlantic Ocean
Bermuda Rise
Blake-Bahama Outer Ridge
Brazil
calcification
calcium
Cenozoic
climate change
continental margin
cores
correlation
deglaciation
Foraminifera
GISP2
Glaciers
Greenland
ice cores
Invertebrata
isotope ratios
isotopes
magnesium
Marine
metals
Mg/Ca
microfossils
North Atlantic
O-18/O-16
Ocean circulation
oxygen
paleo-oceanography
paleocirculation
paleoclimatology
paleosalinity
Pleistocene
Protista
Quaternary
Quaternary geology
Saline water
salinity
Salt
South America
stable isotopes
subtropical environment
Temperature
upper Pleistocene
upper Weichselian
variations
Weichselian
Younger Dryas
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Summary:During the last deglaciation (ca. 21-10 ka), freshening of the North Atlantic surface likely caused reductions in Atlantic meridional overturning circulation (AMOC); the mechanisms related to AMOC recovery remain poorly understood. Here we present three new deglacial surface temperature and ... (...) reconstructions from the western subtropical North and South Atlantic. Similarities to tropical Caribbean and western Atlantic ... records suggest that a salty surface water mass accumulated in the western Atlantic from 27...S to 33...N during periods of reduced AMOC. However, ... decreases led deep AMOC resumption by hundreds of years. We suggest that the northward export of salt previously trapped in the western Atlantic resulted in the early establishment of a shallow overturning circulation that eventually culminated in deep AMOC resumption, implying that AMOC may constitute a self-limiting system. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0091-7613
1943-2682
DOI:10.1130/G25080A.1