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CMIP5 CCSM4 raster levels

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bdmorri2@...
CMIP5 CCSM4 raster levels

Hello, I am working with the CMIP5 CCSM4 AMIP and LGM model data at monthly intervals. When the data is loaded into R as a raster brick, I get warnings stating that there are 17 levels within the raster layers, however, when using GDALUTILS GDALinfo, the metadata does not identify what the levels are. I have used tsa, pr, hurs, and a few other variables from the models and they all have 17 levels with no information. I know the layers are all the different time intervals, but I need to know the levels for converting the netcdf files. Does anyone know what these levels are representing for this particular model/ experiments? Let me know if you need anymore information.

 

Thank you!

Bailey Morrison
University of Illinois at Urbana-Champaign
PhD Student
Global Environmental Analysis and Remote Sensing (GEARS) Laboratory

strandwg

I'm not quite sure why you're seeing only 17 "levels"; can you tell me a specific filename of the data you're looking at?

 

bdmorri2@...

One of the files I am working with is this: hurs_Amon_CCSM4_lgm_r1i1p1_180001-190012.nc. I can see ~1000 year layers when I load the thing, but when I brick it, it gives a warning thatI have 17 levels. I'm assuming that levels and layers are not the same thing here. Out of 56 files/11 of them give me this error. 

Bailey Morrison
University of Illinois at Urbana-Champaign
PhD Student
Global Environmental Analysis and Remote Sensing (GEARS) Laboratory

strandwg
I don't know the software tools you're using, but I suspect they aren't reading the files you have correctly. I have no idea what the software you're using is reporting or the meaning of the message. hurs_Amon_CCSM4_lgm_r1i1p1_180001-190012.nc is comprised of 101 years' worth of monthly data (1212 months) from model year 1800 through model year 1900. I examined it using the standard netCDF utility 'ncdump' and there is no "17" anything in that file.
bdmorri2@...

I have been loading the files in R using the "raster" package. I just use brick(filename) and it converts the file into a viewable raster. I believe that you are probably right that it is not reading the file correctly. I can see all of the different years and monthly averages. I still get the warning about the levels, but when I view 2 separate levels in the raster they are identical. 

 

Thank you for you help!

Bailey Morrison
University of Illinois at Urbana-Champaign
PhD Student
Global Environmental Analysis and Remote Sensing (GEARS) Laboratory

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