Northern Meltwater Pulses, CO₂, and Changes in Atlantic Convection

Global climatic and oceanic conditions underwent fundamental transformations after the last ice age ended about 19,000 years ago. In the North Atlantic, for example, the deglaciation was marked by major changes in the Meridional Overturning Circulation (MOC), which carries warm and highly saline sur...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2011-01, Vol.331 (6014), p.156-158
Main Author: Sarnthein, Michael
Format: Article
Language:English
Subjects:
Age
Atmospheric circulation
Carbon dioxide
Convection
Deep water
Ocean circulation
Ocean-atmosphere interaction
Oceans
Paleoclimate science
PERSPECTIVES
Radiocarbon
Sea water
Surface water
Ventilation systems
Water
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Summary:Global climatic and oceanic conditions underwent fundamental transformations after the last ice age ended about 19,000 years ago. In the North Atlantic, for example, the deglaciation was marked by major changes in the Meridional Overturning Circulation (MOC), which carries warm and highly saline surface water north to cooler regions, where it sinks and creates "deep water" that eventually cycles back to the surface. This process plays a substantial role in regulating climate and levels of atmospheric carbon dioxide (CO2), and understanding how it operated in the past is important to understanding how it may influence climate in the future. On page 202 of this issue, Thornalley et al. provide impressive and detailed evidence of how the North Atlantic MOC behaved after the Last Glacial Maximum (LGM), between 19,000 and 10,000 years ago. In particular, they show that the MOC experienced a series of abrupt changes that lasted from decades to centuries, and that some of the water masses involved were far older--and may have stored and released more carbon--than once believed. [PUBLICATION ABSTRACT]
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1201144