Re: fatal:Div: operator failed, can't continue

From: wei huang <whua27_at_nyahnyahspammersnyahnyah>
Date: Mon Jan 31 2011 - 09:07:23 MST

Thanks for your cooperation, kindly, I have changed the pressure hPa to Pa
but still it does not working and giving the same error: Any help will be
appreciated.
thanks

   P = a->P ; perturbation; Pa

   Pb = a->PB ; base state pressure; Pa

   P = P + Pb ; total pressure

   T = a->T ; perturbation potential temperature

   tk = T + 300.

   qv = a->QVAPOR ; water vapor mixing ratio(kg/kg)

   RH = wrf_rh (qv, P, tk)

   printVarSummary(RH)

   qs = (qv/RH)*100

   printVarSummary(qs)

Error:

fatal:divide: Division by 0, Can't continue

fatal:Div: operator failed, can't continue

fatal:Execute: Error occurred at or near line 17 in file

On Mon, Jan 31, 2011 at 11:36 PM, Dennis Shea <shea@ucar.edu> wrote:

> Please read the documentation:
> http://www.ncl.ucar.edu/Document/Functions/Built-in/wrf_rh.shtml
>
> ==
> "qv" must be kg/kg , you are passing "g/kg"
> "P" must be "Pa", you are passing "hPa"
>
>
>
> On 1/31/11 7:09 AM, wei huang wrote:
>
>> Dear NCL users,
>>
>> I got an error to calculating saturated mixing ratio from the wrf water
>> vapor mixing ratio. I donít know my assumption is correct or not. Could
>> anyone help me to figure out the problem or any advice about it?
>>
>> Thanks
>>
>> wei
>> a = addfile("wrfout_02.nc <http://wrfout_02.nc>","r")
>>
>>
>> P= a->P; perturbation
>>
>> Pb = a->PB; base state pressure
>>
>> P= P + Pb; total pressure
>>
>> T = a->T; perturbation potential temperature
>>
>> tk = T + 300.
>>
>> qv = a->QVAPOR/1000; water vapor mixing ratio(g/kg)
>>
>> RH = wrf_rh (qv, P*.01, tk) ;P*0.01 converts Pa to hPa
>>
>> printVarSummary(RH)
>>
>> qvs = (qv/RH)*100; saturated water vapor mixing ratio(g/kg)
>>
>> printVarSummary(qvs)
>>
>> end
>>
>> ;*****************************************
>>
>> Variable: RH
>>
>> Type: float
>>
>> Total Size: 102667500 bytes
>>
>> 25666875 values
>>
>> Number of Dimensions: 4
>>
>> Dimensions and sizes:[24] x [39] x [south_north | 160] x [west_east | 105]
>>
>> Coordinates:
>>
>> Number Of Attributes: 2
>>
>> units :%
>>
>> description : Relative Humidity
>>
>> fatal:divide: Division by 0, Can't continue
>>
>> fatal:Div: operator failed, can't continue
>>
>> fatal:Execute: Error occurred at or near line 16 in file
>>
>>
>>
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>

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Received on Mon Jan 31 09:07:30 2011

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