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*To*: ocmip-all@lsce.saclay.cea.fr*Subject*: C14 on isopycnals*From*: Robert Key <key@princeton.edu>*Date*: Mon, 10 Jan 2000 12:17:47 -0500*Organization*: Atmos. and Ocean Sci. Program*Sender*: key@princeton.edu

All, This morning I am constructing maps of the measured C-14 distribution on pressure surfaces for the entire Pacific. The shallower surfaces are from Levitus. At deeper levels I am using a slightly increased vertical density. The pressure levels are: c14lev_c(0,10,20,30,50,75,100,125,150,200,250,seq(300,2500,by=100),seq(2750,4000,by=250),seq(4500,5500,by=500)) where seq=sequence Gridding is 1X1 degree using objective mapping. I have saved the error maps also. The results will be posted to the web via the GLODAP site (http://cdiac.esd.ornl.gov/cdiac/oceans/glodap/), but will actually be displayed using the NOAA LAS server (same place used for Indian Ocean carbon display; http://ferret.wrc.noaa.gov/las-bin/CMC_LiveAccess). In the next week I will make maps on potential density surfaces. I would like to reduce interpolation required to match up to models as much as possible. Therefore, I would appreciate a listing of "layers" used by those whose models run on density rather than depth coordinates. If required I can map onto sigmaX where X=0,1,2,3,4. The Pacific Ocean alkalinity and TCO2 calibrations are nearing completion. Once that is done, I will reproduce the above listed maps using bomb-produced and natural C-14. Separation will be via the "potential alkalinity" method devised by Rubin (variation of Broecker's silicate method). Integral values will be calculated from the depth maps. If anyone wants to see vertical sections, these are already available on the GLODAP site (go to "Details" then find Figures under the Radiocarbon section (down about 1.5 pages). The colors on these sections are awful. For publication, the sections can be remade in colors to match model output. bob p.s. Indian Ocean C-14 measurements are about 50% complete

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