Monitoring the integrated deep meridional flow in the tropical North Atlantic: long-term performance of a geostrophic array

Kanzow, T.; Send, U.; Zenk, W.; Chave, A.D.; Rhein, M.. 2006 Monitoring the integrated deep meridional flow in the tropical North Atlantic: long-term performance of a geostrophic array. Deep-Sea Research I, 53 (3). 528-546. https://doi.org/10.1016/j.dsr.2005.12.007

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Abstract/Summary

As a component of the meridional overturning variability experiment in the tropical North Atlantic, a four-year-long time series of meridional transport of North Atlantic deep water has been obtained from moored end point measurements of density and bottom pressure. This study presents a quality assessment of the measurement elements. Rigorous pre- and post- deployment in situ calibration of the density sensors and subsequent data processing establish an accuracy of O(1.5 Sv) in internal transport in the 1200–5000 dbar range at subinertial time scales. A similar accuracy is reached in the bottom pressure-derived external transport fluctuations. However, for pressure, variability with periods longer than a deployment's duration (presently about one year) is not measurable. This effect is demonstrated using numerical simulations and a possible solution for detecting long-term external transport changes is presented.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.dsr.2005.12.007
ISSN:	0967-0637
Additional Keywords:	geostrophic transport; time series; bottom pressure; density; Meridional Overturning Circulation
Date made live:	19 Feb 2007 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/144194

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