Field

GACP aerosol optical depth
Global Aerosol Climatology (GISS/NASA)
X axis: whole world in 360 1.00° steps, first point at 179.50° W, last point at 179.50° E
Y axis: regular grid with 180 1.00° steps, first point at 89.50° S, last point at 89.50° N

Monthly data available from Aug1981 to Dec2009 ( 341 months)
Variable tau (aerosol optical thickness at 550nm) in 1
Full metadata.

Get grid points, average area or generate subset

Mask:	no mask mask4.txt   add a mask to the list
Latitude:	°N - °N
Longitude:	°E - °E
Boundaries:	halfway grid points interpolated
Make:	average max min set of grid points subset of the field
Demand at least:	% valid points in this region

Create a field with lower time resolution

New time scale:	annual (Jul-Jun) annual (Jan-Dec) biannual seasonal
New variable:	mean sd sum sum above sum below number min time of min max time of max first time last time of aerosol optical depth
Threshold:	no cut less than greater than 1 percentile normal 1971-2000
Minimum:	% valid data
First apply:	-month running mean
Missing data:	ignore, climatology, trend, persistence.

Create a field with lower spatial resolution

Average over blocks of longitude and latitude grid cells

getfieldtype: please ask the administrator to add "tau" to the lists in getfieldtype

Construct a statistical forecast model from this field

Please consider downloading this field from the authoritative site.
If you really want to get it here, GACP aerosol optical depth is available as GrADS .ctl and gzipped .dat files (size 84.2926 MB)
Alternatively, you can generate a netCDF file of the same size.

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