Woods Hole Oceanographic Institution

Laurence A Anderson




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Tracer Model-Data Comparison. (Laurence Anderson)

Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES)

Jim Ledwell (WHOI), Valery Kosnyrev (WHOI)

Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES) is a joint US/UK field program aimed at measuring diapycnal and isopycnal mixing in the Antarctic Circumpolar Current.  Jim Ledwell asked Dennis McGillicuddy, Valery Kosnyrev and me if we could make some estimates of where his tracer patch---released at 1500 meters depth---would go, based on near-realtime altimetry.  Valery objectively analyzed the near-realtime altimetry, from which I computed geostrophic surface currents and passed to a tracer advection-diffusion model.  A factor of 38% is applied, to account for the difference between surface currents and those at 1500 meters depth, which was determined by calibrating with tracer concentrations collected one year after release. 

Here are some links to hindcast movies:

3 Feb 2009 to 30 Nov 2009: wmv avi
3 Feb 2009 to 26 Oct 2010: wmv avi
6 Mar 2010 to 22 Dec 2010: wmv avi
22 Dec 2010 to 7 Aug 2011: wmv avi
1 Aug 2011 to 5 Feb 2012: wmv avi
1 Jan 2012 to 18 Mar 2012: wmv avi

Matlab model code
Technical report

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