Altimetry-based proxy for the AMOC at 26°N

Readme created 24-Jun-2015 (efw) Datafile created April 2015 by E. Frajka-Williams. Associated publication detailing the method of creation is: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. PDF of article available _open access_ (http://dx.doi.org/10.1002/2015GL063220) This was originally hosted on figshare: https://doi.org/10.6084/m9.figshare.1461658 but figshare blocks automatic downloads, which makes it incompatible with http://github.com/AMOCcommunity/amocatlas.