[RegCNET] Contradiction between RegCM3-Manual or BATS-Manaul

[bixq]

Hi, Imran:

seasf  ! the magnitude of seasonal variation of vegetation coverage.

Please check with the code in interf.F

            amxtem=dmax1(298.-tgb1d(n,i),0.d0)
            sfac=1.-dmax1(0.d0,1.-0.0016*amxtem**2)
            if(lveg(n,i).eq.0)then
             veg1d(n,i)=0.
            else
             veg1d(n,i)=vegc(lveg(n,i))-seasf(lveg(n,i))*sfac
            endif

You see, 0.0016 = 1/(25*25), around 298K, that mean:

at places ground temperature reachs 298K (25 degree),

     veg1d = vegc                  (the maximum value)

at places ground temperature reachs 273K,
     veg1d = vegc - seasf          (the minimum value)

this means BATS1E document is correct, the related temperature range is 
from 273 to 298.

I will change the regcm.pdf in the next release.

Thanks and regards,
Xunqiang Bi

On Tue, 10 Nov 2009, IMRAN NADEEM wrote:

> Dear BI,
>
>        I hope you are fine and doing well. I found the
> vegetation/landuse-cover parameter "Difference b/w max fractional vegetation
> cover and cover at 269 K" have different values in tables given in BATS
> manual and RegCM3 user guide. I checked BLOCKDATA001.F and found that RegCM3
> is using the parameter values from BATS manual. Please clearify that which
> values are correct?
>
>
> http://users.ictp.it/RegCNET/BATS.pdf             (BATS Manual)
>
> http://users.ictp.it/RegCNET/regcm.pdf            (RegCM3 Manaul)
>
> Best Regards
> Imran Nadeem
> BOKU, Wien
>

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