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Parallel decadal variability of inferred water temperatures for Northern and Southern Hemisphere intermediate water masses
Author(s) -
Thresher Ronald,
Morrongiello John,
Sloyan Bernadette M.,
KrusicGolub Kyne,
Shephard Samuel,
Minto Cóilín,
Nolan Conor P.,
Cerna Francisco,
Cid Luis
Publication year - 2014
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 - 10.1002/2013gl058638
Subject(s) - northern hemisphere , southern hemisphere , water mass , forcing (mathematics) , geology , climatology , oceanography , proxy (statistics) , deep water , machine learning , computer science
We use a novel proxy (growth rates of long‐lived deep water fish, orange roughy) to reconstruct inferred water temperatures of intermediate water masses in both Northern and Southern Hemispheres since the mid‐1800s. The data are consistent with instrumental records showing long‐term warming in the Northern Hemisphere but also indicate decadal variability of intermediate depth temperatures that is coherent across the two hemispheres. This variability correlates with the dominant subpolar annular mode in each hemisphere and implies a bihemispheric oceanic response to external forcing that influences the properties of intermediate depth water masses.