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On the Relation Between Meridional Overturning Circulation and Sea-level Gradients in the Atlantic : Volume 3, Issue 1 (18/04/2012)

By Kienert, H.

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Book Id: WPLBN0004007322
Format Type: PDF Article :
File Size: Pages 32
Reproduction Date: 2015

Title: On the Relation Between Meridional Overturning Circulation and Sea-level Gradients in the Atlantic : Volume 3, Issue 1 (18/04/2012)  
Author: Kienert, H.
Volume: Vol. 3, Issue 1
Language: English
Subject: Science, Earth, System
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Rahmstorf, S., & Kienert, H. (2012). On the Relation Between Meridional Overturning Circulation and Sea-level Gradients in the Atlantic : Volume 3, Issue 1 (18/04/2012). Retrieved from

Description: Potsdam Institute for Climate Impact Research, Telegrafenberg A62, 14473 Potsdam, Germany. On the basis of model simulations, we examine what information on changes in the strength of the Atlantic Meridional Overturning Circulation (AMOC) can be extracted from associated changes in sea surface height (SSH), specifically from a broad Atlantic north-south gradient as has been suggested previously in the literature. Since a relation between AMOC and SSH changes can only be used as an AMOC diagnostic if it is valid independently of the specific forcing, we consider three different forcing types: increase of CO2 concentration, freshwater fluxes to the northern convection sites and the modification of Southern Ocean winds. We concentrate on a timescale of 100 yr. We find approximately linear and numerically similar relations between a sea-level difference within the Atlantic and the AMOC for freshwater as well as wind forcing. However, the relation is more complex in response to atmospheric CO2 increase, which precludes this sea-level difference as an AMOC diagnostic under climate change. Finally, we show qualitatively to what extent changes in SSH and AMOC strength that are caused by simultaneous application of different forcings correspond to the sum of the changes due to the individual forcings, a potential prerequisite for more complex SSH-based AMOC diagnostics.

On the relation between Meridional Overturning Circulation and sea-level gradients in the Atlantic

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