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How to make a new SST input data for CAM4

2

2008sdzzq@163_com

New Member
Hi,I am a beginner to model, now I want to make some new input data to do some experiments with CAM4 on CCSM4_0.According to the icssst tool-060418( http://www.cesm.ucar.edu/models/atm-cam/download/ ), I download SST and sea ice data from NOAA (sst.mnmean.nc &icec.mnmean.nc, 1x1, Monthly means from 1981/12 to 2013/02http://www.esrl.noaa.gov/psd/data/gridded/data.noaa.oisst.v2.html), which I want to make a sst bc file from 1982 to 2012 (31 years).Then I input commands below based on the readme file of the tool,./regrid -i ~/Desktop/icec.mnmean.nc -s ~/Desktop/sst.mnmean.nc -g ~/Desktop/fv_1.9x2.5.nc -o sstice.nc
the answer is:  NetCDF: Variable not found. So whether the tool works in cam4 or did I do something wrong that I didn't realize?  In the readme file, MODEL.had+oiv2.ice.mnly.49-01.ubf.nccan't be available in the internet, so I can not judge whether the sst.mnmean.nc's formats and varibles is right.Thanks for your reading, and I am hopefully for your response, thanks in advance!Zhou
 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
Your datasets icec.mnmean.nc and sst.mnmean.nc should contain variables compatible with the regrid. Below I am providing the b=netcdf header so you can modify your input files to have the right names.--- For the SST file netcdf MODEL.SST.HAD187001-198110.OI198111-201303
Code: 
{ dimensions: time = UNLIMITED ; // (1719 currently)
  lon = 360 ;
  lat = 180 ;
  variables: double time(time) ;
  time:information = "middle of month" ;
  time:calendar = "gregorian" ;
  time:units = "days since 1800-01-01 00:00:00" ;
  float lon(lon) ; lon:units = "degrees_east" ;
  lon:long_name = "longitude" ;
  float lat(lat) ;
  lat:long_name = "latitude" ;
  lat:units = "degrees_north" ;
  int date(time) ; date:units = "yyyymmdd" ;
  int datesec(time) ;
  datesec:units = "current seconds of current date" ;
  double date_frac(time) ;
  date_frac:units = "yyyymmdd.fraction_of_day" ;
  float SST(time, lat, lon) ;
  SST:_FillValue = 1.e+20f ;
  SST:info = "sst-ice consistency enforced" ;
  SST:long_name = "Sea Surface Temperature" ;
  SST:units = "degC" ;
  SST:ice = -1.8f ;
  SST:missing_value = 1.e+20f ;
--- For the sea-ice file netcdf MODEL.ICE.HAD187001-198110.OI198111-201303
Code: 
{ dimensions: time = UNLIMITED ; // (1719 currently)
  lon = 360 ;
  lat = 180 ;
  variables: double time(time) ;
  time:units = "days since 1800-01-01 00:00:00" ;
  time:calendar = "gregorian" ;
  time:information = "middle of month" ;
  float lon(lon) ;
  lon:units = "degrees_east" ;
  lon:long_name = "longitude" ;
  float lat(lat) ;
  lat:units = "degrees_north" ;
  lat:long_name = "latitude" ;
  int date(time) ;
  date:units = "yyyymmdd" ;
  int datesec(time) ;
  datesec:units = "current seconds of current date" ;
  double date_frac(time) ;
  date_frac:units = "yyyymmdd.fraction_of_day" ;
  float SEAICE(time, lat, lon) ;
  SEAICE:_FillValue = 1.e+20f ;
  SEAICE:info = "sst-ice consistency enforced" ;
  SEAICE:missing_value = 1.e+20f ;
  SEAICE:units = "%" ;
  SEAICE:long_name = "Sea Ice Concentration" ;
 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
Your datasets icec.mnmean.nc and sst.mnmean.nc should contain variables compatible with the regrid. Below I am providing the b=netcdf header so you can modify your input files to have the right names.--- For the SST file netcdf MODEL.SST.HAD187001-198110.OI198111-201303
Code: 
{ dimensions: time = UNLIMITED ; // (1719 currently)
  lon = 360 ;
  lat = 180 ;
  variables: double time(time) ;
  time:information = "middle of month" ;
  time:calendar = "gregorian" ;
  time:units = "days since 1800-01-01 00:00:00" ;
  float lon(lon) ; lon:units = "degrees_east" ;
  lon:long_name = "longitude" ;
  float lat(lat) ;
  lat:long_name = "latitude" ;
  lat:units = "degrees_north" ;
  int date(time) ; date:units = "yyyymmdd" ;
  int datesec(time) ;
  datesec:units = "current seconds of current date" ;
  double date_frac(time) ;
  date_frac:units = "yyyymmdd.fraction_of_day" ;
  float SST(time, lat, lon) ;
  SST:_FillValue = 1.e+20f ;
  SST:info = "sst-ice consistency enforced" ;
  SST:long_name = "Sea Surface Temperature" ;
  SST:units = "degC" ;
  SST:ice = -1.8f ;
  SST:missing_value = 1.e+20f ;
--- For the sea-ice file netcdf MODEL.ICE.HAD187001-198110.OI198111-201303
Code: 
{ dimensions: time = UNLIMITED ; // (1719 currently)
  lon = 360 ;
  lat = 180 ;
  variables: double time(time) ;
  time:units = "days since 1800-01-01 00:00:00" ;
  time:calendar = "gregorian" ;
  time:information = "middle of month" ;
  float lon(lon) ;
  lon:units = "degrees_east" ;
  lon:long_name = "longitude" ;
  float lat(lat) ;
  lat:units = "degrees_north" ;
  lat:long_name = "latitude" ;
  int date(time) ;
  date:units = "yyyymmdd" ;
  int datesec(time) ;
  datesec:units = "current seconds of current date" ;
  double date_frac(time) ;
  date_frac:units = "yyyymmdd.fraction_of_day" ;
  float SEAICE(time, lat, lon) ;
  SEAICE:_FillValue = 1.e+20f ;
  SEAICE:info = "sst-ice consistency enforced" ;
  SEAICE:missing_value = 1.e+20f ;
  SEAICE:units = "%" ;
  SEAICE:long_name = "Sea Ice Concentration" ;
 
2

2008sdzzq@163_com

New Member
Hannay,
Thanks for your reply. I have modified my input files following your suggestion to have the names: time, lat, lon, date, datesec, date_frac, SST/SEAICE, but it didn't work, so can you give me the two nc files you mentioned above: netcdf MODEL.SST.HAD187001-198110.OI198111-201303 & netcdf MODEL.ICE.HAD187001-198110.OI198111-201303 or the website where I can download them? Thanks.
Zhou
 
2

2008sdzzq@163_com

New Member
Hannay,
Thanks for your reply. I have modified my input files following your suggestion to have the names: time, lat, lon, date, datesec, date_frac, SST/SEAICE, but it didn't work, so can you give me the two nc files you mentioned above: netcdf MODEL.SST.HAD187001-198110.OI198111-201303 & netcdf MODEL.ICE.HAD187001-198110.OI198111-201303 or the website where I can download them? Thanks.
Zhou
 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
Check the Climate Data guide:
https://climatedataguide.ucar.edu/guidance/merged-hadley-noaaoi-sea-surface-temperature-sea-ice-concentration-hurrell-et-al-2008
You will find a description of teh dataset, its strengths, weaknesses and where to find it.
Cecile
 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
Check the Climate Data guide:
https://climatedataguide.ucar.edu/guidance/merged-hadley-noaaoi-sea-surface-temperature-sea-ice-concentration-hurrell-et-al-2008
You will find a description of teh dataset, its strengths, weaknesses and where to find it.
Cecile
 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
I am told there might be problem with accessing the SSTs from the cliamte guide.
The files are also on the CGD ftp area

ftp ftp.cgd.ucar.edu
anonymous
email
cd archive/SSTICE
ls
prompt
mget MODEL*nc
 
hannay

hannay

Cecile Hannay
AMWG Liaison
Staff member
I am told there might be problem with accessing the SSTs from the cliamte guide.
The files are also on the CGD ftp area

ftp ftp.cgd.ucar.edu
anonymous
email
cd archive/SSTICE
ls
prompt
mget MODEL*nc
 
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