Impact of Greenland orography on the Atlantic Meridional Overturning Circulation
We show that the absence of the Greenland ice sheet would have important consequences on the North Atlantic Ocean circulation, even without taking into account the effect of the freshwater input to the ocean from ice melting. These effects are investigated in a 600year long coupled ocean‐atmosphere...
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Published in | Geophysical research letters Vol. 42; no. 3; pp. 871 - 879 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Washington
Blackwell Publishing Ltd
16.02.2015
John Wiley & Sons, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | We show that the absence of the Greenland ice sheet would have important consequences on the North Atlantic Ocean circulation, even without taking into account the effect of the freshwater input to the ocean from ice melting. These effects are investigated in a 600year long coupled ocean‐atmosphere simulation with the high‐resolution global climate model EC‐Earth 3.0.1. Once a new equilibrium is established, a cooling of Eurasia and of the North Atlantic and a poleward shift of the subtropical jet are observed. These hemispheric changes are ascribed to a weakening of the Atlantic Meridional Overturning Circulation (AMOC) by about 12%. We attribute this slowdown to a reduction in salinity of the Arctic basin and to the related change of the mass and salt transport through the Fram Strait—a consequence of the new surface wind pattern over the lower orography. This idealized experiment illustrates the sensitivity of the AMOC to local surface winds.
Key Points
The removal of Greenland ice sheet affects the intensity of the AMOC |
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Bibliography: | istex:AC02E3153108EA7488F99ADF0C8B6B3ECA834329 ArticleID:GRL52550 ark:/67375/WNG-CKW9D9HD-9 Supporting Information S1 Project of Interest "NextData" of the Italian Ministry of Education, University and Research (MIUR) ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0094-8276 1944-8007 |
DOI: | 10.1002/2014GL062668 |