Minutes of OCMIP-2 Meeting of Opportunity

San Antonio, Texas
January, 24, 2000, 9AM to noon

Attending: Chris Sabine, Mick Follows, Scott Doney, Jean-Claude Dutay, Akio Ishida, Ken Caldeira, Ferial Louanchi, Jorge Sarmiento, John Bullister, Corinne Le Quere, Bob Key, Niki Gruber, Keith Lindsay, Ray Najjar, Tom Guilderson


  1. CFCs. We first discussed the draft of the CFC paper that Jean-Claude has initiated. Jean-Claude has received many helpful comments. Much of the feedback he has received has been positive, much of it by email.
  2. Physics. Doney and Lindsay will be working on a paper to describe the physical simulations of the OCMIP models. NCAR will make a template for the remaining physical parameters that need to be submitted by OCMIP modelers, such as heat flux, overturning, etc. Doney had previously, by email, produced a detailed outline of a paper on the physical simulations.
  3. CFCs/anthropogenic CO2. Niki Gruber expressed an interest in analyzing the historical runs, particularly the CFC/anthropogenic CO2 relationship.
  4. Bomb C-14/anthropogenic CO2. Jorge expressed interest in the bomb C-14/anthropogenic CO2 relationship.
  5. APO. Jorge described a project to use the OCMIP models to force some atmospheric GCMs in order to evaluate the simulation of atmospheric potential oxygen (APO).
  6. CO2 pumps. Jorge would like to follow up on some of his previous CO2 pump (solubility and biotic) analysis from OCMIP-1.
  7. Delta C*. Chris expressed interest in evaluating the Delta C* approach by applying to one or more of the OCMIP models.
  8. Deep C-14. Bob discussed a project to evaluate the deep circulation of the OCMIP models using C-14 observations.
  9. PO4 and O2. Ferial described an analysis of the biotic run, which would focus on the distribution of phosphate and oxygen throughout the ocean, and possibly the surface pCO2 distribution.
  10. Anthropogenic CO2. There was general interest in creating a high visibility anthropogenic CO2 uptake paper.

Najjar made it clear that those interested in pursuing an analysis project present, in a manner similar to what Doney and Dutay had done, a detailed outline of the paper to the OCMIP group as a whole in order to get feedback and involvement of other members. No one "owns" an analysis project without making a presentation to the rest of the group, which effectively invites other participants into the analysis.


The group seemed to agree that the all groups would be represented in the author list when a tracer or simulation appears for the first time. For example, the CFC paper, should have at least one member from every modeling group presented in the paper. Other, later CFC papers, however, need not involve everyone.


We then got an update on the status of the data sets used for evaluating the OCMIP models.

Bullister described some of the CFC quality control processing. He noted that there are a lot more data than are in the Dutay et al. manuscript. He and his collaborators on the data analysis are working on gridded data sets, water mass analysis and pCFC analyses.

Key described the WOCE C-14 data. The Pacific is done (QC and sections) and 80% of the data are now downloadable from the GLODAP web site (link to this from the OCMIP web site). A 3-D gridded version of the data set will soon be on the PMEL Live Access Server, on level and/or density surfaces. Bob has applied the Rubin-Takahashi algorithm for estimating the bomb component in the Pacific, and a paper is in progress describing this technique. The Indian Ocean should be done in about a year. Contact Bob if you are interested in any of the WOCE data that you cannot get off of the web yourself.

Bob also noted that almost all of the WOCE nutrient and oxygen data are available. Najjar noted that there are two seasonal O2 and phosphate climatologies now

Sabine discussed the CO2 data. He warned us not to get CO2 data from the WOCE office, as it is uncalibrated. He suggests going to CDIAC. The Indian Ocean is done and gridded to 1 degree and 30 levels (see the GLODAP web site). TCO2 (natural and anthropogenic components) and Alk are available. The Pacific is just being finished up. TCO2 errors are 2-3 umol/kg, Alk 3-5 ueq/kg. He will be generating TCO2 and Alk fields from cruises where other carbonate system parameters were measured (pH and pCO2).

Tom Guilderson discussed coral C-14 data. He is working with Schrag and Druffel to construct pre- and post-bomb C-14 data bases, mostly with an equatorial and subtropical Pacific focus. There are lots of time series that could be extremely useful for evaluating OCMIP models. Tom is collaborating with Mark Cane and Ken Caldeira on some modeling projects using these data. The data are available at the NOAA paleoclimate web site. You can also contact Tom directly.


It was suggested that the next OCMIP meeting be held in the N.E. US, possibly at Princeton, in the summer.


There was a wide ranging discussion on what to do after OCMIP-2. The general feeling was that we need to do a lot of analysis and not much model running. If there were to be another proposal, there would be more emphasis on analysis of existing model results. There was dome discussion, however, of possible modeling projects, such as the use of inverse techniques in models, a focus on more biology, etc. There are a number of carbon cycle programs at the early planning stages such as EDOC, OCTET, SOLAS, etc. Ken noted that DOE is funding sequestration work at $2 million/year