Decadal variability of the Arctic Ocean thermal structure |
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| Authors: | Madhusoodanan MS Bijoy Thompson |
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| Institution: | (1) National University of Singapore, Physical Oceanography Research Laboratory, Tropical Marine Science Institute, Singapore, Singapore;(2) Department of Geological Sciences, Stockholm University, Stockholm, Sweden |
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| Abstract: | Long-term variability of heat content (HC) in the upper 1,000 m of the Arctic Ocean is investigated using surface and subsurface
temperature and current data during 1958–2005 compiled by Simple Ocean Data Assimilation. Annual cycle of the Arctic Ocean
HC is controlled primarily by the negative and positive excursions in net upper ocean heat flux, while the inter-annual variability
is mainly associated with meridional thermal advection from the North Atlantic Ocean. Variability in HC is experienced as
a basin-wide cooling/warming in association with the Arctic Oscillation on a decadal time scale. In the first three dominant
modes of Empirical Orthogonal Function, the maximum amplitude of HC variability occurs in the Greenland–Norwegian Sea and
Eurasian Basin. In general, HC showed increasing trend during 1958–2005 indicating continuous warming with regional variations
in magnitude. |
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