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Monitoring Atlantic Overturning Circulation Variability with Grace-type Ocean Bottom Pressure Observations – a Sensitivity Study : Volume 12, Issue 4 (14/08/2015)

By Bentel, K.

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Book Id: WPLBN0004020875
Format Type: PDF Article :
File Size: Pages 27
Reproduction Date: 2015

Title: Monitoring Atlantic Overturning Circulation Variability with Grace-type Ocean Bottom Pressure Observations – a Sensitivity Study : Volume 12, Issue 4 (14/08/2015)  
Author: Bentel, K.
Volume: Vol. 12, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Bentel, K., Landerer, F. W., & Boening, C. (2015). Monitoring Atlantic Overturning Circulation Variability with Grace-type Ocean Bottom Pressure Observations – a Sensitivity Study : Volume 12, Issue 4 (14/08/2015). Retrieved from

Description: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr, Pasadena, CA 91109, USA. The Atlantic Meridional Overturning Circulation (AMOC) is a key mechanism for large-scale northward heat transport and thus plays an important role for global climate. Relatively warm water is transported northward in the upper layers of the North Atlantic Ocean, and after cooling at subpolar latitudes, sinks down and is transported back south in the deeper limb of the AMOC. The utility of in-situ ocean bottom pressure (OBP) observations to infer AMOC changes at single latitudes has been characterized in recent literature using output from ocean models. We extend the analysis and examine the utility of space-based observations of time-variable gravity and the inversion for ocean bottom pressure to monitor AMOC changes and variability between 20 and 60° N. Consistent with previous results, we find a strong correlation between the AMOC signal and OBP variations, mainly along the western slope of the Atlantic basin. We then use synthetic OBP data – smoothed and filtered to resemble the resolution of the GRACE gravity mission – and reconstruct geostrophic AMOC transport. Due to the coarse resolution of GRACE-like OBP fields, we find that leakage of signal across the step slopes of the ocean basin is a significant challenge at certain latitudes. However, overall, the inter-annual AMOC anomaly time series can be recovered from 20 years of monthly GRACE-like OBP fields with errors less than 1 Sverdrup.

Monitoring Atlantic overturning circulation variability with GRACE-type ocean bottom pressure observations – a sensitivity study

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