Alessandra,
Try this script:
f=addfile("http://iridl.ldeo.columbia.edu/expert/SOURCES/.WCRP/.CMIP3/%28ipcc4/20c3m%29%40%40/%28ipcc4/20c3m/miroc3_2_medres%29%40%40/.pcmdi.ipcc4.miroc3_2_medres.20c3m.run2.atm.mo.xml/zg/9.8/mul/ta/1005.7/mul/add/hus/2501000/mul/add/plev/30000/10000/RANGEEDGES/plev/integralgrid/plev/differences//name//deltap/def%5Bplev%5Dweighted-average/time/1/monthlyAverage/time/%28Dec%201900%29%28Jan%201999%29RANGE/time/3/runningAverage/time/12/splitstreamgrid/time/%2Fmon/renameGRID/time2/%2FT/renameGRID/-999/setmissing_value/dods", "r")
print(f)
It should produce:
Variable: f
Type: file
filename: dods
path: http://iridl.ldeo.columbia.edu/expert/SOURCES/.WCRP/.CMIP3/%28ipcc4/20c3m%29%40%40/%28ipcc4/20c3m/miroc3_2_medres%29%40%40/.pcmdi.ipcc4.miroc3_2_medres.20c3m.run2.atm.mo.xml/zg/9.8/mul/ta/1005.7/mul/add/hus/2501000/mul/add/plev/30000/10000/RANGEEDGES/plev/integralgrid/plev/differences//name//deltap/def%5Bplev%5Dweighted-average/time/1/monthlyAverage/time/%28Dec%201900%29%28Jan%201999%29RANGE/time/3/runningAverage/time/12/splitstreamgrid/time/%2Fmon/renameGRID/time2/%2FT/renameGRID/-999/setmissing_value/dods
file global attributes:
Conventions : IRIDL
dimensions:
T = 98
lat = 64
lon = 128
mon = 12
variables:
double lon ( lon )
standard_name : longitude
modulus : 360
bounds : lon_bnds
uniquename : lon
units : degree_east
axis : X
gridtype : 1
double lat ( lat )
standard_name : latitude
bounds : lat_bnds
uniquename : lat
units : degree_north
axis : Y
gridtype : 0
float mon ( mon )
pointwidth : 3
calendar : 360
modulo : 12
modulus : 12
gridtype : 1
units : months since 1960-01-01
float T ( T )
calendar : 360
pointwidth : 12
gridtype : 0
units : months since 1960-01-01
float asum ( T, mon, lat, lon )
original_name : geopotential height
long_name : Geopotential Height
standard_name : geopotential_height
dodsname : zg
cell_methods : time: mean (interval: 20 minutes comment: approx. value of variable model time-step)
file_missing_value : 1e+20
history : Boxes with less than 0.0% dropped
Boxes with less than 100.0% dropped
Averaged in time with overlapping interval 3
Boxes with less than 0.0% dropped
units : unitless
missing_value : -999
_FillValue : -999
Otherwise, your NCL version is not opendap-enabled.
Wei
huangwei@ucar.edu
VETS/CISL
National Center for Atmospheric Research
P.O. Box 3000 (1850 Table Mesa Dr.)
Boulder, CO 80307-3000 USA
(303) 497-8924
On Jan 3, 2014, at 1:10 PM, Alessandra Giannini <alesall@iri.columbia.edu> wrote:
>
> Hello everyone,
>
> I am having trouble reading CMIP3 model output through the IRI Data Library, using opendap, but am at a total loss as to why.
>
> This is the error message I get:
>
> ncvarget: ncid 327680; varid 4: NetCDF: I/O failure
> fatal:NetCdf: An error occurred while attempting to read variable (asum) from file (http://iridl.ldeo.columbia.edu/expert/SOURCES/.WCRP/.CMIP3/%28ipcc4/20c3m%29%40%40/%28ipcc4/20c3m/miroc3_2_medres%29%40%40/.pcmdi.ipcc4.miroc3_2_medres.20c3m.run2.atm.mo.xml/zg/9.8/mul/ta/1005.7/mul/add/hus/2501000/mul/add/plev/30000/10000/RANGEEDGES/plev/integralgrid/plev/differences//name//deltap/def%5Bplev%5Dweighted-average/time/1/monthlyAverage/time/%28Dec%201900%29%28Jan%201999%29RANGE/time/3/runningAverage/time/12/splitstreamgrid/time/%2Fmon/renameGRID/time2/%2FT/renameGRID/-999/setmissing_value/dods)
>
> I am pretty sure the data is fine. If you go to the link:
> <http://iridl.ldeo.columbia.edu/expert/SOURCES/.WCRP/.CMIP3/%28ipcc4/20c3m%29%40%40/%28ipcc4/20c3m/miroc3_2_medres%29%40%40/.pcmdi.ipcc4.miroc3_2_medres.20c3m.run2.atm.mo.xml/zg/9.8/mul/ta/1005.7/mul/add/hus/2501000/mul/add/plev/30000/10000/RANGEEDGES/plev/integralgrid/plev/differences//name//deltap/def%5Bplev%5Dweighted-average/time/1/monthlyAverage/time/%28Dec%201900%29%28Jan%201999%29RANGE/time/3/runningAverage/time/12/splitstreamgrid/time/%2Fmon/renameGRID/time2/%2FT/renameGRID/>
> you can visualize the data by clicking any of the plot icons.
>
> You will note that I am not simply reading data. Through the Data Library I can manipulate the data, and in this case I perform a vertical integral of moist static energy, i.e.
> gz + cT +Lq, from 300 to 100 hPa.
>
> I do not have an issue when I simply read precipitation in a similar way, from this url:
> <http://iridl.ldeo.columbia.edu/expert/SOURCES/.WCRP/.CMIP3/%28ipcc4/20c3m%29%40%40/%28ipcc4/20c3m/gfdl_cm2_0%29%40%40/.pcmdi.ipcc4.gfdl_cm2_0.20c3m.run3.atm.mo.xml/.pr/time/1/monthlyAverage/time/%28Dec%201900%29%28Jan%201999%29RANGE/time/3/runningAverage/time/12/splitstreamgrid/time//mon/renameGRID/time2//T/renameGRID/>
>
> All this is making me think that either the connection times out, or the memory is insufficient. But I can't get my hands around the cause, or solution for that matter...
> I would appreciate it if anyone could interpret this line specifically:
>
> ncvarget: ncid 327680; varid 4: NetCDF: I/O failure
>
> thanks much, and happy new year!
>
> best, alessandra
>
>
>
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>
>
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>
>
> --
> Alessandra Giannini
> IRI for Climate and Society - The Earth Institute at Columbia University
> P.O. Box 1000, Palisades NY 10964-8000
> phone/fax: +1 845 680-4473/4864 - email: alesall@iri.columbia.edu
>
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Received on Fri Jan 03 13:32:41 2014
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