private copy of SST/ICE data for 1949-2005

[sang-ki_lee@noaa_gov]

Hi CAM users,

I have create T42 SST/ICE data for my personal use. But, If you
like, you can download them from my ftp site for your work.

Here is how I prepare the data:
1) download Hadley Centre Sea Ice and SST data set (HadISST)
from http://www.hadobs.org/ for the period of Jan/1930-Aug/2006.

2) The data is 1x1 and in ascii format, so they are converted into
netcdf format using ferret. FLN tranformation is used to fill the
holes over the land.

3) nco package is used to create and modify attributes such as
units and long_name and etc.

4) REGRID.pl (included in the CAM3 SST/ICE generation package)
is used to create a grid file: "regrid.T42.nc", then nco package is used
to create attribute for lon and lat.

5) finally, SST/ICE generation package "icesst-060418" is used
to create the climatology and monthly time series SST/ICE data

WARNING: There is big possiblity that I made some mistakes at some
points. So, buyers be aware. And If you find any problem, please let
me know.

The data are available at
ftp.aoml.noaa.gov/phod/pub/sklee/data/cam3/
sst_HadOIBl_bc_64x128_1949_2005.nc
sst_HadOIBl_bc_64x128_clim.nc

Sincerely,

Sang-ki

 

[sang-ki_lee@noaa_gov]

Hi

Dennis Shea at NCAR is the right person to contact if you
are looking for an updated CAM3 sst forcing file.

I find that preparing the CAM3 forcing data is very tedious
and tricky job. For instance, CAM3 forcing data is based on
Reynodls SST climatology (1982-2001) + Hadley SST anomaly.
So, my suggestion to you is to send email to Dennis Shea for
an updated dataset.

But, if you want to prepare CAM3 data for yourself anyway, here is
another (maybe better than the one I suggested earlier using ferret)
way to do it by using NCL:

(1) First, download the HADLEY center sst/seaice data in netcdf
format:
http://hadobs.metoffice.com/hadisst/data/HadISST_sst.nc.gz
http://hadobs.metoffice.com/hadisst/data/HadISST_ice.nc.gz

(2) Then get the following four files from AOML/NOAA ftp site:
ftp.aoml.noaa.gov/phod/pub/sklee/friends/jorge/
cam.date.1870-2007.dat
cam.time.1870-2007.dat
cam31.hadisst.sstgen.1870-2007.com
cam31.hadisst.icegen.1870-2007.com

(3) The following two scripts will read hadley center sst/seaice
data then prepare two dataset to be used with NCAR forcing
data construction package:
cam31.hadisst.sstgen.1870-2007.com
cam31.hadisst.icegen.1870-2007.com

Note that you need to modify the directory structure and other
minor things. And, of course you need to have NCL installed
on your machine. Note that this programs use only CAM3 sst
data. If you want to mix Reynolds SST climatology with Hadley
center sst anomaly as in original CAM3 forcing data, you need to
downlaod Reynolds SST then use two NCL routines, namely
"clmMonTLL" and "calcMonAnomTLL".

Again, it is better to send email to Dennis Shea.

Good luck!

Sang-ki

 

[education4life99@yahoo_com]

I think that after a few minutes of looking at the cam3 forcing data, that I will take your advice. I do believe that would take a while.