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Multidecadal variability and climate shift in the North Atlantic Ocean
Author(s) -
Seidov Dan,
Mishonov Alexey,
Reagan James,
Parsons Rost
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl073644
Subject(s) - atlantic multidecadal oscillation , climatology , thermohaline circulation , environmental science , north atlantic oscillation , gulf stream , regime shift , north atlantic deep water , oceanography , climate change , ocean heat content , spatial coherence , atlantic equatorial mode , geology , coherence (philosophical gambling strategy) , ecology , physics , quantum mechanics , ecosystem , biology
Decadal variability of ocean heat content (OHC) and temperature trends over ~60 years in the North Atlantic Ocean were analyzed using a new high‐resolution ocean climatology based on quality‐controlled historic in situ observations. Тwo ~30 year ocean climates of 1955–1984 and 1985–2012 were compared to evaluate the climate shift in this region. The spatial distribution of the OHC climate shift is highly inhomogeneous, with the climate shift being the strongest southeast of the Gulf Stream Extension. This may be caused by the Atlantic Meridional Overturning Circulation slowdown in conjunction with heaving of warm subtropical water. The 30 year climate shift shows higher OHC gain in the Gulf Stream region than reported in shorter timescale estimates. The OHC change is generally coherent with the Atlantic Multidecadal Oscillation index. This coherence suggests that quasi‐cyclicity of the OHC may exist, with a period of 60 to 80 years, superimposed on the slow basin‐wide warming trend.