DOI: 10.6084/m9.figshare.1463479
title: MOCproxy_for_figshare_v1.0.mat

description: README for MOCproxy_for_figshare.mat<br>====================================<br>Readme created 24-Jun-2015 (efw)Description<br>-----------<br>Datafile created April 2015 by E. Frajka-Williams.Find current contact information at http://eleanorfrajka.comAssociated publication detailing the method of creation is:<br>Frajka-Williams, E. (2015), Estimating the Atlantic overturning at 26°N using satellite altimetry and cable measurements. Geophys. Res. Lett., 42, 3458–3464. doi: 10.1002/2015GL063220.<br>PDF of article available _open access_ (http://dx.doi.org/10.1002/2015GL063220)<br>Data file<br>---------<br>- File size: 16 KB<br>- File format: Matlab. Data can be loaded in Matlab using the command&gt;&gt; load MOCproxy_for_figshare.mator by double clicking the file (on a computer with Matlab installed).<br>Data variables<br>--------------<br>The file contains two variables of class structure: `mocgrid` and `recon`. # Fields<br>- time [units of Matlab time]: Both variables contain a time vector as a structure field [1x264] running monthly from January 15, 1993 to Dec 15, 2004. The time vector is in Matlab time format, which is in days since January 0, 0000, where the numeric value 727944 corresponds to January 15, 1993.<br>mocgrid:<br>These data are filtered versions of the data produced by the joint UK/US-funded RAPID-MOCHA project at 26N in the Atlantic. Original data can be accessed at http://rapid.ac.uk. The version of data used was from Apr 2004 through Mar 2014.<br>- gs [units Sverdrups, where 1 Sv = 1,000,000 cubic meters per second]: The strength of the Gulf Stream transport through the Florida Straits between Florida and Bahamas, as measured by a submarine telephone cable.<br>- umo [units Sverdrups]: The strength of the upper mid-ocean transport between the Bahamas and Africa at 26N, in the top (roughly) 1100 m of the ocean.<br>- ek [units Sverdrups]: Surface meridional (north-south) Ekman transport as estimated from ERA-Interim reanalysis winds.- moc [units Sverdrups]: The meridional overturning circulation at 26N or, the volume of water moving northward in the top (roughly) 1100 m of the ocean which is equal-and-opposite-to the volume of water moving southward below this depth.<br>- lnadw [units Sverdrups]: The lower North Atlantic Deep water transport or mid-ocean transport between the Bahamas and Africa and between the depth layers of 3000 m and 5000 m.- unadw [units Sverdrups]: As for lnadw, but between 1100 m and 3000 m.<br>recon:<br>These data include the same source of data as for the Gulf Stream and Ekman transport (above) but additionally contains the fields<br>- h1umo [units centimeters]: sea level anomaly from a spatially-smoothed and temporally filtered version of the AVISO mapped absolute dynamic topography product and selected near 28N, 70W in the Atlantic, at the point with the highest anticorrelation between the upper mid-ocean transport measured by the RAPID-MOCHA project and sea level anomaly.<br>- umoproxy [units Sverdrups]: a proxy for the upper mid-ocean transport based on the linear regression between recon.h1umo and mocgrid.umo.- mocproxy [units Sverdrups]: a proxy for the meridional overturning circulation at 26N, based on recon.umoproxy, recon.gs and recon.ek.<br><br><br>Working with the data<br>---------------------<br>Plot the comparison between the MOC and the proxy version:<br>&gt;&gt; figure(1); clf&gt;&gt; plot(mocgrid.time,mocgrid.moc,'r','linewidth',2);<br>&gt;&gt; hold on&gt;&gt; plot(recon.time,recon.mocproxy,'k')<br>&gt;&gt; datetick('x')&gt;&gt; ylabel('Northward transport [Sv]')<br>&gt;&gt; legend('MOC from RAPID','MOC* proxy','location','best')<br>Plot the comparison between the UMO and the proxy version:&gt;&gt; figure(2);clf<br>&gt;&gt; plot(mocgrid.time,mocgrid.umo,'m','linewidth',2)&gt;&gt; hold on<br>&gt;&gt; plot(recon.time,recon.umoproxy,'k')&gt;&gt; datetick('x')<br>&gt;&gt; ylabel('Northward transport [Sv]')&gt;&gt; legend('UMO from RAPID','UMO* proxy','location','best')<br>