Hi Ana,
Something like
ncks -d time,0,11 sst_jan1978_sep1993.nc 78.nc
ncks -d time,12,23 sst_jan1978_sep1993.nc 79.nc
ncea 78.nc 79.nc 7879avg.nc
might work. It's possible the averaging will make the headers
unusable by CCM. If that happens just use ncks to patch anything
that was averaged that shouldn't have been. See the manual for
examples.
Charlie
--
Until September 10:
Charlie Zender Voice: (303) 497-1445, FAX: 497-1400
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After September 10:
Charlie Zender zender@xxxxxxx (949) 824-2987/FAX-3256 www.ess.uci.edu/zender
Earth System Science 216 PSRF, University of California, Irvine, CA 92697-3100