Dear all,
I have a question on the time variable of a monthly climatologies collecting e.g. all data from
1900-01-01 to 2000-12-31.
As I understand the standard
(
http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/cf-conventions.html#climatological-statistics),
I should use the following:
dimensions:
time=12;
nv=2;
variables:
float temperature(time,lat,lon);
temperature:cell_methods="*time: mean within years time: mean over years*";
double time(time);
time:climatology="climatology_bounds";
time:units="days since 1900-1-1";
double climatology_bounds(time,nv);
data: // time coordinates translated to date/time format
time="1900-1-16", "1900-2-16", "1900-3-16", "1900-4-16", ... "1900-12-16";
climatology_bounds="1900-1-1", "2000-2-1",
"1900-2-1", "2000-3-1",
....
"1900-11-1", "2001-12-1";
I use the standard Gregorian calendar. Can you confirm that the used cell_methods and
climatology_bounds are correct?
I am not so sure about the cell method since the WOA 2009 climatology uses "time:mean within
*months* time:mean over *months*" for monthly climatologies
(
http://data.nodc.noaa.gov/thredds/dodsC/woa/WOA09/NetCDFdata/temperature_monthly_1deg.nc.info).
I am wondering if it would not have been easier to define climatology_bounds as an array with the
starting and end dates of *all *subintervals (not just the start for the first and the end of the
last subinterval). It would be simpler to find out to which time slice of the climatological
variable an individual observation would relate to. It would also allow to make climatologies over
other cycles (e.g. tides) or non-periodic processes (e.g. ENSO).
Thank you for your help!
Alex
--
Alexander Barth
GeoHydrodynamics and Environment Research, MARE, AGO
University of Li?ge, Sart-Tilman B5,
4000 Li?ge, Belgium
Phone: +32-4-3663664
Fax: +32-4-3669729
Email: a.barth at ulg.ac.be
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Received on Fri Nov 08 2013 - 04:48:05 GMT
