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contributor authorGjermundsen, Ada
contributor authorLaCasce, Joseph H.
contributor authorDenstad, Liv
date accessioned2019-09-19T10:02:33Z
date available2019-09-19T10:02:33Z
date copyright2/5/2018 12:00:00 AM
date issued2018
identifier otherjpo-d-17-0147.1.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4260891
description abstractAbstractThe global circulation driven solely by relaxation to an idealized surface temperature profile and to interior mixing is examined. Forcing by winds and evaporation/precipitation is excluded. The resulting circulation resembles the observed in many ways, and the overturning is of similar magnitude. The overturning is driven by large-scale upwelling in the interior (which is relatively large, because of the use of a constant mixing coefficient). The compensating downwelling occurs in the northern North Atlantic and in the Ross and Weddell Seas, with an additional, smaller contribution from the northern North Pacific. The latter is weaker because the Bering Strait limits the northward extent of the flow. The downwelling occurs in frictional layers near the boundaries and depends on the lateral shear in the horizontal flow. The shear, in turn, is linked to the imposed surface temperature gradient via thermal wind, and as such, the downwelling can be reduced or eliminated in selected regions by removing the surface gradient. Doing so in the northern North Atlantic causes the (thermally driven) Antarctic Circumpolar Current to intensify, increasing the sinking along Antarctica. Eliminating the surface gradient in the Southern Ocean increases the sinking in the North Atlantic and Pacific. As there is upwelling also in the western boundary currents, the flow must increase even more to accomplish the necessary downwelling. The implications of the results are then considered, particularly with respect to Arctic intensification of global warming, which will reduce the surface temperature gradient.
publisherAmerican Meteorological Society
titleThe Thermally Driven Ocean Circulation with Realistic Bathymetry
typeJournal Paper
journal volume48
journal issue3
journal titleJournal of Physical Oceanography
identifier doi10.1175/JPO-D-17-0147.1
journal fristpage647
journal lastpage665
treeJournal of Physical Oceanography:;2018:;volume 048:;issue 003
contenttypeFulltext


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