CDO

#!/bin/bash

tmpdir=./tmp

mkdir -p $tmpdir

for year in $(seq -w 1961 1964) ; do

echo $year

cdo -seltimestep,1/12 pr_Amon_BCC-CSM2-MR_dcppA-hindcast_s${year}.nc $tmpdir/series${year}.nc

done

cd $tmpdir

cdo mergetime '*.nc' series_t1.nc

exit 0