[RegCNET] querries about idirect=1

[Solmon Fabien]

Dear Yong yu

Yes you are right, this problem in regcm3 was coming from the fact that
some longwave variables were not reset to the 'no aerosol' value after
calculation of radiative forcing. This problem has been fixed in RegCM4,
so I strongly encourage you to switch!
However in regcm3 if you use the no aerosol ichem =0 fro control run
compared to ichem=1/idirect = 2, you are OK anyway . Also the error
introduced by this inconsistency in term of the radiatve forcing
calculation is not big compared to other sources of uncertainties, and it
is a problem related to dust aerosol only.

Fabien

> Dear all
>         Using RegCM3 code which is download about 1month ago, I have done
> 2 experiment£º
>           1£®  Set aerotype  AER00D0  in domain.param
>           2£®  Set aerotype  AER11D1  in domain.param, set idirect=1 in
> regcm.in
>        Other conditions are exactly same, I have compared the RAD output
> between these two experiments, I found that they are different, I
> don¡¯t know why?
>       I have known idirect =1 means that the aerosol don't couple to the
> dynamic and thermodynamic. so the difference of RAD output between
> these two experiments should be zero? Could you please tell me some
> detail information about this? Thank you very much!
>
> Best wishes
> Yong  Yu
>
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