I have yearly mean SST (3D: lon X lat X time) data for 100 years. Using this data I want to calculate yearly anomaly SST data. What is the procedure to do this in ferret?
Answer is expected: how to do it using "repeat" loop in ferret over time-steps and subtracting climatological mean from every time-steps. (Any other solution is also ok)
Hello Subrota Halder,
To save yourself from stress.
Install "cdo" using
sudo apt-get install cdo =============> (on linux)
To convert monthly data to yearly data (assuming the name of the original monthly data is "SST_monthly.nc ")
cdo yearmean SST_monthly.nc SST_yearmean.nc (ignore this is your data is yearly already)
To calculate the long-term mean use:
cdo timmean SST_yearmean.nc SST_clim.nc
To calculate the yearly anomaly use:
cdo sub SST_yearmean.nc SST_clim.nc SST_anomaly
For more insight : https://code.mpimet.mpg.de/projects/cdo/embedded/cdo.pdf
If you insist on using Ferret, use this example
http://ferret.pmel.noaa.gov/Ferret/faq/how-do-i-calculate-climatologies-and-climatological-anomalies
Cheers.
Dear,
Akintomide Afolayan Akinsanola
cdo is not working properly, I am facing the following problem. Please suggest me what to do
[anant@iitmlogin5 Dataset]$ cdo timmean hadisst_yearly.nc hadisst_clim.nc
cdo timmean: Processed 9590696 values from 2 variables over 148 timesteps ( 0.27s )
[anant@iitmlogin5 Dataset]$ cdo sub hadisst_yearly.nc hadisst_clim.nc hadisst_yearly_anom.nc
cdo sub: Filling up stream2 >hadisst_clim.nc< by copying the first timestep.
Segmentation fault (core dumped)
Are you working serially on your local PC or parallel using HPC?
If your data is attachable send to : [email protected]
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