describefield: error: cannot find GPCPData/gpcp_22.ctl Full metadata. Cannot locate the land/sea mask file

Get grid points, average area or generate subset

Mask:	no mask mask7.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
Considering:	everything land points sea points show/hide more only land points only sea points not land points not sea points

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 precipitation
Threshold:	no cut less than greater than absolute value 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

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, GPCP v2.2 precipitation is available as GrADS .ctl and gzipped .dat files (size 0 0 1.90735e-05 3.24249e-05 2.28882e-05 2.38419e-05 2.28882e-05 2.28882e-05 2.19345e-05 3.24249e-05 4.19617e-05 3.8147e-05 3.43323e-05 3.33786e-05 3.14713e-05 3.52859e-05 3.33786e-05 3.43323e-05 3.62396e-05 3.43323e-05 3.33786e-05 3.05176e-05 3.62396e-05 3.33786e-05 3.43323e-05 3.14713e-05 0.00119591 3.14713e-05 3.52859e-05 3.24249e-05 3.33786e-05 3.43323e-05 3.52859e-05 3.33786e-05 3.24249e-05 3.8147e-05 0.00390625 3.91006e-05 3.43323e-05 3.71933e-05 3.8147e-05 3.05176e-05 3.33786e-05 3.52859e-05 3.71933e-05 3.14713e-05 3.14713e-05 3.52859e-05 3.43323e-05 3.52859e-05 3.91006e-05 3.71933e-05 3.33786e-05 2.67029e-05 3.05176e-05 3.33786e-05 3.33786e-05 3.33786e-05 3.43323e-05 3.33786e-05 3.43323e-05 3.62396e-05 0.0667925 4.57764e-05 5.05447e-05 3.52859e-05 3.52859e-05 3.24249e-05 3.33786e-05 3.33786e-05 4.00543e-05 0.014307 3.43323e-05 3.43323e-05 3.43323e-05 3.43323e-05 3.33786e-05 3.52859e-05 3.43323e-05 3.43323e-05 3.71933e-05 3.43323e-05 3.52859e-05 3.43323e-05 0.00390625 3.43323e-05 3.33786e-05 3.24249e-05 0.00390625 3.71933e-05 3.43323e-05 3.33786e-05 3.24249e-05 0.0117188 3.62396e-05 3.43323e-05 3.91006e-05 3.52859e-05 2.38419e-05 3.14713e-05 2.09808e-05 3.52859e-05 3.52859e-05 3.14713e-05 3.33786e-05 3.24249e-05 3.71933e-05 3.52859e-05 3.62396e-05 4.00543e-05 3.43323e-05 3.43323e-05 3.43323e-05 3.43323e-05 3.62396e-05 3.43323e-05 3.43323e-05 3.33786e-05 3.43323e-05 3.43323e-05 3.52859e-05 3.33786e-05 3.43323e-05 3.52859e-05 3.52859e-05 0.0046339 3.91006e-05 3.8147e-05 3.05176e-05 3.33786e-05 3.52859e-05 3.43323e-05 3.33786e-05 3.52859e-05 3.62396e-05 3.33786e-05 3.71933e-05 3.71933e-05 3.43323e-05 3.43323e-05 3.05176e-05 0.00390625 0.00390625 3.43323e-05 3.43323e-05 3.43323e-05 0.00390625 3.62396e-05 3.43323e-05 3.33786e-05 3.52859e-05 3.43323e-05 3.43323e-05 3.33786e-05 3.43323e-05 3.43323e-05 3.62396e-05 3.05176e-05 3.43323e-05 3.33786e-05 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4.19617e-05 3.8147e-05 4.1008e-05 0.00225544 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 0.0236073 0.00314522 0.00635815 0.00250435 0.00253773 0.00132847 0.0065527 0.0273438 3.91006e-05 0.00018692 0.000152588 0.00186634 0.000821114 0.00475121 0.00171185 0.0107536 0.000946999 0.0201578 0.0038681 0.00390625 0.000322342 0.000858307 1.62125e-05 0.00629234 0.0145578 0.0302439 0.0332499 3.43323e-05 0.00390625 0.000460625 0.00254631 0.00186443 0.00596428 0.000435829 0.0122404 9.53674e-06 1.04904e-05 0.00114918 1.04904e-05 1.04904e-05 1.04904e-05 1.04904e-05 1.04904e-05 1.04904e-05 0.000370026 0.0936966 0.008358 0.0117188 0.00881863 2.95639e-05 0.000834465 0.00057888 0.00286293 0.00336456 0.00275707 3.71933e-05 4.00543e-05 0.00298023 0.000201225 35.6122 0.0117188 0.00390625 0.000162125 0.00759697 0.00162029 0.00198841 0.00135612 0.00131035 0.00164413 0.000581741 0.0017004 0.000520706 0.0076704 0.00122643 0.000642776 0.00542259 0.00270653 0.00107288 0.00414658 0.00515842 1.81198e-05 1.81198e-05 1.81198e-05 1.81198e-05 1.81198e-05 1.71661e-05 1.71661e-05 1.71661e-05 1.71661e-05 1.71661e-05 1.71661e-05 0.00146198 0.0046978 0.00056839 0.00344944 0.00284004 0.00288391 0.00261879 0.00323677 0.000185013 0.0360966 0.0442915 0.00114155 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 0.00352097 0.00110435 0.016017 0.0407934 0.000757217 0.00196934 0.000494957 1.33514e-05 1.33514e-05 0.000452995 0.000270844 0.000325203 0.0285273 0.00185871 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 0.000680923 1.71661e-05 1.71661e-05 1.71661e-05 1.71661e-05 1.71661e-05 1.71661e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 0.00230598 1.14441e-05 1.14441e-05 1.14441e-05 0.00142002 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 0.000244141 0.00203705 0.0013485 0.000478745 0.000413895 0.000494957 0.000343323 0.000231743 0.000227928 0.00328636 1.14441e-05 1.14441e-05 1.14441e-05 1.14441e-05 0.00547791 0.00891876 0.00628567 0.013381 1.14441e-05 1.14441e-05 0.000245094 0.000247955 0.000259399 0.000714302 1.14441e-05 0.000253677 0.0149269 1.14441e-05 1.14441e-05 0.002738 0.000267982 3.14713e-05 0.000953674 0.00390625 5.05447e-05 0.00390625 0.0319376 0.00151825 5.34058e-05 0.000377655 0.00390625 0.00183201 0.0122499 0.00563431 0.00390625 3.05176e-05 3.14713e-05 0.00390625 5.14984e-05 0.00109291 0.000676155 0.000198364 0.000627518 0.000160217 0.0650616 0.00390625 5.14984e-05 0.00541401 4.95911e-05 0.000128746 0.000225067 0.000770569 0.000252724 0.00118828 3.14713e-05 0.00390625 0.00171471 0.00171471 0.00390625 0.000914574 0.000132561 0.000305176 0.00390625 5.05447e-05 0.0195312 0.000270844 0.00254822 0.000621796 0.00284863 0.00096035 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0.000577927 0.00201797 0.0674667 0.000921249 0.000644684 0.00954437 0.0243387 0.0001297 0.00688839 0.00284672 0.000472069 0.00091362 0.000471115 0.00121784 0.000847816 0.00114441 0.000668526 0.000330925 0.00572014 0.00116539 0.00178051 0.00617313 0.00153732 0.00150013 0.00152111 3.33786e-05 0.0426273 3.62396e-05 0.00261497 0.00169849 0.00512505 0.00363636 0.000648499 0.000616074 0.00022316 0.00390625 0.0025835 7.15256e-05 0.00026226 0.00767994 0.00524807 1.04904e-05 1.04904e-05 1.04904e-05 1.04904e-05 1.04904e-05 1.04904e-05 0.000969887 0.00390625 0.00856972 0.000257492 0.000189781 0.000257492 0.000267982 0.00618362 0.00390625 0.000351906 0.00726604 2.95639e-05 3.43323e-05 0.000208855 3.62396e-05 3.91006e-05 3.8147e-05 4.3869e-05 3.8147e-05 4.29153e-05 0.00232983 0.00151062 0.00404549 0.00185966 0.00204563 0.0014925 0.00306511 0.00158596 0.000920296 5.05447e-05 0.00150681 0.00326633 0.00232124 0.01894 0.00164318 0.00498199 0.00111103 0.000281334 0.00390625 0.00688744 0.00394154 0.00390625 0.00483418 0.000148773 0.0341415 0.0124664 0.000225067 0.00390625 0.00171852 0.00204468 3.24249e-05 0.00390625 0.00221539 MB)
Alternatively, you can generate a netCDF file of the same size.