Mountain ranges favour vigorous Atlantic meridional overturning


Sinha, Bablu, Blaker, Adam T., Hirschi, Joël J.-M., Bonham, Sarah, Brand, Matthew, Josey, Simon A., Smith, Robin S. and Marotzke, Jochem (2012) Mountain ranges favour vigorous Atlantic meridional overturning. Geophysical Research Letters, 39, (2), L02705. (doi:10.1029/2011GL050485).

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Description/Abstract

We use a global Ocean-Atmosphere General Circulation Model (OAGCM) to show that the major mountain ranges of the world have a significant role in maintenance of the Atlantic Meridional Overturning Circulation (AMOC). A simulation with mountains has a maximum AMOC of 18 Sv (1 Sv = 106 m3 s−1) compared with ∼0 Sv for a simulation without mountains. Atlantic heat transport at 25°N is 1.1 PW with mountains compared to 0.2 PW without. The difference in AMOC is due to major changes in surface heat and freshwater (FW) fluxes over the Atlantic. In the Pacific changed surface fluxes lead to a meridional overturning circulation of 10 Sv. Our results suggest that the effects of mountains on the large-scale atmospheric circulation is to force the ocean towards a state with a vigorous AMOC and with no overturning in the Pacific.

Item Type: Article
ISSNs: 0094-8276 (print)
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Divisions: National Oceanography Centre (NERC) > Marine Physics and Ocean Climate
National Oceanography Centre (NERC) > Marine Systems Modelling
ePrint ID: 209911
Date Deposited: 02 Feb 2012 14:46
Last Modified: 27 Mar 2014 19:50
URI: http://eprints.soton.ac.uk/id/eprint/209911

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