SSTICE forcing file for F1850 runs

[zhaos]

Hello,

I found that the default SST and Sea ice forcing for F1850 runs is SSTICE_DATA_FILENAME: /glade/p/cesmdata/cseg/inputdata/atm/cam/sst/sst_HadOIBl_bc_1x1_clim_pi_c101029.nc. Which analysis period is used to generate this monthly SST and Sea ice climatology? Which dataset is this forcing file derived from?

I tried a ncdump of the file, and it shows:
netcdf sst_HadOIBl_bc_1x1_clim_pi_c101029 {
dimensions:
lon = 360 ;
lat = 180 ;
time = UNLIMITED ; // (12 currently)
variables:
int date(time) ;
date:long_name = "current date (YYYYMMDD)" ;
int datesec(time) ;
datesec:long_name = "current seconds of current date" ;
double lon(lon) ;
lon:long_name = "longitude" ;
lon:units = "degrees_east" ;
double lat(lat) ;
lat:long_name = "latitude" ;
lat:units = "degrees_north" ;
double time(time) ;
time:units = "days since 0000-01-01 00:00:00" ;
time:calendar = "365_day" ;
float ice_cov(time, lat, lon) ;
ice_cov:long_name = "BCS Pseudo Sea-ice concentration" ;
ice_cov:units = "fraction" ;
float ice_cov_prediddle(time, lat, lon) ;
ice_cov_prediddle:long_name = "Sea-ice concentration before time diddling" ;
ice_cov_prediddle:units = "fraction" ;
float SST_cpl(time, lat, lon) ;
SST_cpl:long_name = "BCS Pseudo SST" ;
SST_cpl:units = "deg_C" ;
float SST_cpl_prediddle(time, lat, lon) ;
SST_cpl_prediddle:long_name = "SST before time diddling" ;
SST_cpl_prediddle:units = "deg_C" ;

// global attributes:
:history = "2010-10-29 10:12:56 regrid -i /datalocal/nrcm-cgd/jcaron/1850sst/MODEL.ICE.HAD185001-198110.OI198111-201006.nc -s /datalocal/nrcm-cgd/jcaron/1850sst/MODEL.SST.HAD185001-198110.OI198111-201006.nc -g ./data_1x1.nc -o sstice_1x1.nc\n",
"2010-10-29 10:16:28 bcgen -i sstice_1x1.nc -c sst_HadOIBl_bc_1x1_clim_pi_c101029.nc -t sst_HadOIBl_bc_1x1_1850_2009_c101029.nc" ;

I had a hard time in understanding the commands recorded in the global attributes. Any help would be greatly appreciated!

 

[peverley]

Hi,

From one of our scientists:

The sst and ice forcing files are all generated using the sstice tools provided with the model (written in the past by karl taylor and
others). generally, information can be found in this paper:

Hurrell, J. W., J. J. Hack, D. Shea, J. M. Caron, and J. Rosinski,
2008: A New Sea Surface Temperature and Sea Ice Boundary Dataset for
the Community Atmosphere Model. Journal of Climate, 21, 5145–5153,
https://doi.org/10.1175/2008jcli2292.

which answers the question about the data source. it is a hybrid/merged sst dataset using Reynolds OI and HadISST.

As for the analysis period, the person who might know that is currently out of office, but I will follow up with you when she returns in a couple of weeks.

Hope this helps!
Courtney

 

[zhaos]

Thank you, Courtney, this helps!

 

[peverley]

Hi again. To follow up, this is the response I got from the other scientist who may have known about the analysis period:

I believe it was for the period 1870-1890. But this is my best guess as this file was created in 2010 and it doesn't have any metadata. (FYI: It was not customary at the time to include any metadata. Now we do, but not in 2010).

 

[zhaos]

Thanks for the follow up!