CCSM3.0 CO2 experiments

[cathryn_meyer@yale_edu]

Hello,

In the CCSM3.0 runs that were done with 2xCO2, 4xCO2, and 1% increasing CO2, what are these in reference to? 1990 CO2 values? How many ppmv is 1xCO2?

Also, what type of ocean was used in these runs? Dynamical, swamp, data ...? I would like to retrieve the increase in SST values between a control run and an increased CO2 run, I want to make sure this would be possible to do.

Thanks,
Cathy

 

[njn01]

The ocean model used in the CCSM3.0 CO2 runs was the CCSM ocean model, which is based upon LANL Parallel Ocean Program, or pop. You can read the scientific description of the CCSM pop model and find the User's Guide at

http://www.ccsm.ucar.edu/models/ccsm3.0/pop/

The full 3D ocean monthly-averaged temperature fields are standard output from the ocean model, so you should be able to extract the SST from the ocean-model history files.

 

[cathryn_meyer@yale_edu]

I can not access the ocean model history files from the ESG without a UCAR gatekeeper account. ... how do I go about getting one of these?

Is SST not available as post-processed data? I have only found potential temperature in the post-processed data monthly averages so far.

Thanks,
Cathy

 

[murphys]

cathern,

not sure where you are looking. I pulled up one of the co2 runs on the ESG and this is what I saw:

13. b30.025.ES01.pop.h.SST.0400-01_cat_0449-12.ncNcMLNetCDFgridded305258708NCAR DISK | NCAR MSS 114. b30.025.ES01.pop.h.SST.0450-01_cat_0499-12.ncNcMLNetCDFgridded305258708NCAR DISK | NCAR MSS 115. b30.025.ES01.pop.h.SST.0500-01_cat_0549-12.ncNcMLNetCDFgridded305258708NCAR DISK | NCAR MSS 116. b30.025.ES01.pop.h.SST.0550-01_cat_0599-12.ncNcMLNetCDFgridded305258708NCAR DISK | NCAR MSS


note the SST in the label.

do you have an account on the ESG? You do not need a ucar gate keeper account to download data from the ESG, only an ESG account. This must be requested. www.earthsystemgrid.org It can take up to 24 hours to get an account.

 

[cathryn_meyer@yale_edu]

I do have an ESG account. I found those SST files, however they only contain potential temperature (the variable TEMP), starting at 5 meters below the surface and at levels below that. Is that value at 5 meters depth equivalent to sea surface temperature?

Cathy

 

[murphys]

in POP, SST is the upper layer of TEMP. They have pulled this out and called it SST to make that clear. That is the closest TEMP value to the surface.