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Geophysical Institute, University of Bergen

Increased ocean heat transport into the Arctic Mediterranean over the period 1993-2016

Recommended citation:
Takamasa Tsubouchi, Kjetil Våge, Bogi Hansen, Karin Margretha H. Larsen, Svein Østerhus, Clare Johnson, Steingrímur Jónsson, Héðinn Valdimarsson (2020) Increased ocean heat transport into the Arctic Mediterranean over the period 1993-2016
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Abstract
This study provides, for the first time, mass-balanced ocean heat transport time series across the rim of Arctic Mediterranean (Greenland-Scotland Ridge, Davis Strait, and Bering Strait) between January 1993 and April 2017. We synthesize all available moored records of velocity and temperature for the major ocean currents crossing the boundary. A box inverse model is used to generate mass-balanced ocean circulation on monthly time steps. The derived monthly ocean heat transport is highly variable ranging from ~200 TW to ~450TW. The long-term mean ocean heat transport is 316 ± 47 TW (mean ± standard deviation). Around 2000 an increase from ~300 TW to ~320 TW occurred. This shift is a result of increases in volume transport and temperature of the Atlantic inflow across the Greenland-Scotland Ridge. The extra ~20 TW is twice the amount of heat required to explain the recent sea ice reduction and ocean heat content increase in the northern seas.
Scientific keywords:
EARTH SCIENCE> OCEANS> OCEAN CIRCULATION> OCEAN CURRENTS
EARTH SCIENCE> OCEANS> OCEAN HEAT BUDGET> ADVECTION
Key words:
Ocean volume transport, Ocean heat transport
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