Peer-Reviewed Journal Details
Mandatory Fields
McCarthy, GD;Menary, MB;Mecking, JV;Moat, BI;Johns, WE;Andrews, MB;Rayner, D;Smeed, DA
2017
March
Journal of Geophysical Research-Oceans
The importance of deep, basinwide measurements in optimized Atlantic Meridional Overturning Circulation observing arrays
Published
0 ()
Optional Fields
SEA-LEVEL RISE NORTH-ATLANTIC TEMPORAL VARIABILITY SOUTH ATLANTIC 26.5-DEGREES-N 26-DEGREES-N CLIMATE DESIGN MODEL TRANSPORT
122
1808
1826
The Atlantic Meridional Overturning Circulation (AMOC) is a key process in the global redistribution of heat. The AMOC is defined as the maximum of the overturning stream function, which typically occurs near 30 degrees N in the North Atlantic. The RAPID mooring array has provided full-depth, basinwide, continuous estimates of this quantity since 2004. Motivated by both the need to deliver near real-time data and optimization of the array to reduce costs, we consider alternative configurations of the mooring array. Results suggest that the variability observed since 2004 could be reproduced by a single tall mooring on the western boundary and a mooring to 1500 m on the eastern boundary. We consider the potential future evolution of the AMOC in two generations of the Hadley Centre climate models and a suite of additional CMIP5 models. The modeling studies show that deep, basinwide measurements are essential to capture correctly the future decline of the AMOC. We conclude that, while a reduced array could be useful for estimates of the AMOC on subseasonal to decadal time scales as part of a near real-time data delivery system, extreme caution must be applied to avoid the potential misinterpretation or absence of a climate time scale AMOC decline that is a key motivation for the maintenance of these observations.
WASHINGTON
2169-9275
10.1002/2016JC012200
Grant Details