Rapid freshening of the deep North Atlantic Ocean over the past four decades

Bob Dickson (), Igor Yashayaev, Jens Meincke, Bill Turrell, Stephen Dye and Juergen Holfort
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Bob Dickson: Centre for Environment, Fisheries, and Aquaculture Science
Igor Yashayaev: Bedford Institute of Oceanography
Jens Meincke: Institut fur Meereskunde
Bill Turrell: Marine Laboratory
Stephen Dye: Centre for Environment, Fisheries, and Aquaculture Science
Juergen Holfort: Institut fur Meereskunde

Nature, 2002, vol. 416, issue 6883, 832-837

Abstract: Abstract The overflow and descent of cold, dense water from the sills of the Denmark Strait and the Faroe–Shetland channel into the North Atlantic Ocean is the principal means of ventilating the deep oceans, and is therefore a key element of the global thermohaline circulation. Most computer simulations of the ocean system in a climate with increasing atmospheric greenhouse-gas concentrations predict a weakening thermohaline circulation in the North Atlantic as the subpolar seas become fresher and warmer1,2,3, and it is assumed that this signal will be transferred to the deep ocean by the two overflows. From observations it has not been possible to detect whether the ocean's overturning circulation is changing, but recent evidence suggests that the transport over the sills may be slackening4. Here we show, through the analysis of long hydrographic records, that the system of overflow and entrainment that ventilates the deep Atlantic has steadily changed over the past four decades. We find that these changes have already led to sustained and widespread freshening of the deep ocean.

Date: 2002
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DOI: 10.1038/416832a

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