[RegCNET] Question about ICBCs

[XUNQIANG BI]

Yes, you are right. So all the Qv in ICBC and RegCM output are
water vapor mixing ratio.

I'll correct the GrADS descriptor message soon.

Thanks a lot !
Bi
On Thu, 22 Feb 2007, Guangyu Wu wrote:

> Hi Dr. Bi,
>
> Thanks for your quick response.
>
> I checked the ICBC.f code, the function for converting
> RH (relative humidity) to Q is HUMID2FV, which uses
> formula: Q=Q*Qs ( Qs=0.622*SATVP/(P-SATVP) )to convert
> RH to Q. So I guess here the result Q is mixing ratio,
> right? I saw someone are using the same equation to
> convert RH to MR on the Internet.
>
> I am not quite familiar with climate variables. I
> searched over the Internet and found that the
> relationship between SH and MR is SH = MR /(MR+1), so
> there are little difference between the two. I am
> looking forward to your comments.
>
> Best regards and happy new year!
>
> Guangyu Wu
>
>
>
> --- XUNQIANG BI <bixq at ictp.it> wrote:
>
>>
>> I think the output after PostProc is also specific
>> humidity.
>>
>> On Thu, 22 Feb 2007, Guangyu Wu wrote:
>>
>>> Dear all,
>>>
>>> While checking the generated ICBC files, I found
>> that
>>> the Q is the specific humidity (SH) in the ICBC
>>> description file. But after postprocessing, the QD
>>> variable is indicated as mixing ratio (QD). Does
>> the
>>> postproc convert SH to QD, or just use the same
>>> variable for different names? In RegCM main model,
>>> which variable is used? Because there are some
>>> differences between the two variables in reality,
>> I am
>>> wondering if someone can help me figure out this
>>> problem. Thanks in advance!
>>>
>>> Guangyu Wu
>>>
>>>
>>>
>>>
>>
> ____________________________________________________________________________________
>>> The fish are biting.
>>> Get more visitors on your site using Yahoo! Search
>> Marketing.
>>>
>>
> http://searchmarketing.yahoo.com/arp/sponsoredsearch_v2.php
>>> _______________________________________________
>>> RegCNET mailing list
>>> RegCNET at lists.ictp.it
>>> https://lists.ictp.it/mailman/listinfo/regcnet
>>>
>>
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>    Dr. Xunqiang Bi         email:bixq at ictp.it
>>    Earth System Physics Group
>>    The Abdus Salam ICTP
>>    Strada Costiera, 11
>>    P.O. BOX 586, 34100 Trieste, ITALY
>>    Tel: +39-040-2240302  Fax: +39-040-2240449
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>
>
>
>
> ____________________________________________________________________________________
> Any questions? Get answers on any topic at www.Answers.yahoo.com.  Try it now.
>

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   Dr. Xunqiang Bi         email:bixq at ictp.it
   Earth System Physics Group
   The Abdus Salam ICTP
   Strada Costiera, 11
   P.O. BOX 586, 34100 Trieste, ITALY
   Tel: +39-040-2240302  Fax: +39-040-2240449
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~