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Atmospheric Blocking and Atlantic Multi-Decadal Ocean VariabilityAtmospheric blocking over the northern North Atlantic involves isolation of large regions of air from the westerly circulation for 5-14 days or more. From a recent 20th century atmospheric reanalysis (1,2) winters with more frequent blocking persist over several decades and correspond to a warm North Atlantic Ocean, in-phase with Atlantic multi-decadal ocean variability (AMV). Ocean circulation is forced by wind-stress curl and related air/sea heat exchange, and we find that their space-time structure is associated with dominant blocking patterns: weaker ocean gyres and weaker heat exchange contribute to the warm phase of AMV. Increased blocking activity extending from Greenland to British Isles is evident when winter blocking days of the cold years (1900-1929) are subtracted from those of the warm years (1939-1968).
Document ID
20110008410
Document Type
Preprint (Draft being sent to journal)
Authors
Hakkinen, Sirpa (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rhines, Peter B. (Washington Univ. Seattle, WA, United States)
Worthen, Denise L. (Wyle Integrated Science and Engineering Group Houston, TX, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Subject Category
Oceanography
Distribution Limits
Public
Copyright
Public Use Permitted.

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