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Parallel decadal variability of inferred water temperatures for northern and southern hemisphere intermediate water masses

Thresher, Ronald
; 
Morrongiello, John
; 
Sloyan, Bernadette M.
; 
Krusic-Golub, Kyne
; 
Shephard, Samuel
; 
Minto, Cóilín
; 
Nolan, Conor P.
; 
Cerna, Francisco
; 
Cid, Luis
Identifiers
http://hdl.handle.net/10379/14158
https://doi.org/10.13025/26665
Repository DOI
10.1002/2013gl058638
Publication Date
2014-02-20
Keywords
antarctic intermediate water, north atlantic oscillation, southern annular mode, arctic oscillation index, sub-polar mode wwater, otolith, roughy hoplostethus-atlanticus, orange roughy, climate-change, ocean, pacific, mode
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Article
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Citation
Thresher, Ronald; Morrongiello, John; Sloyan, Bernadette M. Krusic-Golub, Kyne; Shephard, Samuel; Minto, Cóilín; Nolan, Conor P.; Cerna, Francisco; Cid, Luis (2014). Parallel decadal variability of inferred water temperatures for northern and southern hemisphere intermediate water masses. Geophysical Research Letters 41 (4), 1232-1237
Abstract
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. Key Points <list list-type="bulleted" id="grl51370-list-0001"> <list-item id="grl51370-li-0001">Growth rates of deep-sea fish proxy intermediate depth water temperature <list-item id="grl51370-li-0002">Long-term warming in North Atlantic but variable temperatures in South Pacific <list-item id="grl51370-li-0003">Parallel variability implies hemispheres respond simultaneously to forcing
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Publisher
Wiley-Blackwell
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Attribution-NonCommercial-NoDerivs 3.0 Ireland
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Externally hosted open access publications with University of Galway authors (2)