[RegCNET] Run aerosol with direct or indirect effects

[XUNQIANG BI]

Hi, Nguyen:

On Wed, 25 Feb 2009, Nguyen Ngoc Bich Phuong wrote:

> *I know about option for idirect
>
> idirect = 0 : no radiative forcing is calculated**
> **idirect=1 = aerosol without climatic feedback BUT radiative forcing **
> **calculated . **
> **idirect=2 allows the aerosl to feedback on the radiative tendencies ; **
> **in this case the radiative forcing calculated  accounts implicitely for **
> **atmosphere feedback*
>
> *And I think idirect = 1 means direct effects*
>
> *            idirect = 2 means indirect effects *

No, the indirect effect if not available in the web version, and Ashraf is 
just working on this for a new package of indirect effect.
>
> *and how to change option in RegCM3 to calculate *
>
> *indirect 1:"albedo effect" meaning aerosol make change albedo of cloud*
>
> *indirect 2: "lifetime effect" meaning aerosol make change lifetime of cloud

You cannot run the experiment on indirect effects by using the present web
version.

> *
>
> *I still don't understand clearly how to run RegCM3 with cases: direct (SOx 
> and CO2) and indirect (1 & 2)*
>
> *Please tell me how to run it, thank you in advance*

As I understood, by using the present version, you can only run it on the 
direct effect os aerosol. Two experiment (one with idirect = 1 
and the other with idirect = 2), The differnce would tell you the direct 
effect of aerosols.

Regards,
Xunqiang Bi

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   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
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