[RegCNET] the timestep in RegCM3

[bixq]

Hi, Liwei:

This is typical in grid-point model, by using a forward time scheme for 
the 1st step, then use the leapfrog time scheme for the rest steps.

so 2*dt is used for leapfrog.

Regards,
Bi Xunqiang

On Tue, 8 Jun 2010, zou liwei wrote:

> Dear ALL,
>
>       Sorry for disturbing you.
>
>       I am confused about the timestep in RegCM3. The folling is my case.
>
>       In the "regcm.in",  we specify every step is 100s (variable "dt" in
> model ). At the first step, "dt" is really 100s, however, when the model
> goes to the second step, "dt" is changed to 200s (double of 100s).
>
>       We note that the  "dt"  have been changed to 2*dt in temd.f. WHY?
>
>      Would anybody give me some suggestion, please?
>
>       Thank you in advance.
>
>      Best Wishes,
>
>      Liwei
> 2010-06-08
>

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