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I am working my way through this paper: http://downloads.hindawi.com/journals/amete/2017/8707234.pdf

Equations 10 and 11 require the ice water content. I can't find it in the GFS grib2 file variables. Did I miss it, or is possible to derive it from the available information. Right now I have pressure, temperature, and relative humidity.

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There is a parameter ice water mixing ratio in the gfs.t<hour>z.pgrb2.0p25.f<step> file given at isobaric levels.

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  • $\begingroup$ To get the IWC, I would multiple by the density of dry air? $\endgroup$ – Craeft Mar 30 at 11:32

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