[RegCNET] how to change BATS parameters in RegCM3, such as maximun fractional vegetation cover

[Jonathan Winter]

I've never used the LNDFUDGE option, but I don't think that this
approach will work.  From my understanding, LNDFUDGE only adjusts the
landuse type, nothing else.  And unless you edit the file "LANDUSE", it
does nothing.  I also don't think changing iblk will help at all, and
may even cause errors in your preprocessing.

The way I would do this is go into the Main directory, make a variable
mod_vegc in BLOCKDATA001.F which has your modified vegetation cover.
Make sure you initialize the variable and add it to the appropriate
common blocks if necessary.  Then, wherever vegc is used, write an
if/else statement using i and j (denote domain by index), or xlon and
xlat (denote domain by lat, lon) to use vegc where you want no
modifications and mod_vegc where you want the vegetation cover altered.
Make sure you use some print statements to check that your scheme is
working correctly.

jonathan     

On Wed, 2007-08-29 at 04:43 +0000, 刘雅勤 wrote:
> 
> Hi jonathan and RegCNETers,thanks for you help.
> 
> I've run RegCM in domain size (80SN*150WE) with the original vegc
> value, now I want to change the small region's vegc (25SN*40WE), which
> with the same central point to the (80SN*150WE). I mean, I want to see
> how impact the vegetation cover over small region to the climate in
> the whole domain region.
> 
> My way is:
> 1. run the terrain.x (this time iy=80,jx=150, and LNDFUDGE=.false.)
> 2. edit the iblk in terrain.f, estimate iblk = ihmax*jhmax where ihmax
> = (xmaxlat-xminlat)/xnc and jhmax = (xmaxlon-xminlon)/xnc, according
> to the small regin size (iy=25,jx=40). 
> 3. set LNDFUDGE=.true. rerun terrain.x
> 4.change the vegc value in BLOCKDATA001.F
> 5.run regcm.x
> 
> IS it right?
> if someone know the correct way, please tell me, I'll very grateful.
> 
> Regards,
> alisaliu
> 
> > Subject: Re: [RegCNET] how to change BATS parameters in RegCM3, such
> as maximun fractional vegetation cover
> > From: jwinter at MIT.EDU
> > To: liuyaqin60 at hotmail.com
> > CC: regcnet at lists.ictp.it
> > Date: Tue, 28 Aug 2007 17:32:45 -0400
> > 
> > Using the grep command is probably the best way to find specific
> > variables. Since you're looking for albedo:
> > 
> > grep 'albedo' *
> > 
> > is a good start. Do this in both the Main directory and the
> > Main/Commons. Find out more about grep by typing: 
> > 
> > man grep 
> > 
> > Regarding the specific variables you mentioned:
> > albvgs - vegetation albedo for wavelengths < 0.7 microns
> > albvgl - vegetation albedo for wavelengths > 0.7 microns
> > vegc - maximum fractional cover of vegetation
> > 
> > In the newest version of the model these variables are located in
> > BLOCKDATA001.F
> > 
> > jonathan
> > 
> > On Tue, 2007-08-28 at 15:16 +0000, 刘雅勤 wrote:
> > > Dear RegCNETers,
> > > 
> > > I am graduated student in China.Now I expect to get help for how
> to change BATS parameters in RegCM3 when making impact of vegetation
> cover experiments,such as maximun fractional vegetation cover and
> vegetation albedo,etc.I have the BATS technical note in BATS.pdf and
> the BATS vegetation/land-cover (Table 2) in RegCM Version 3.1 User's
> Guide. 
> > > 
> > > I just find ../Terrain/LANDUSE, but I don't want to change the
> vegetation type,as edit the text file LANDUSE, make the change in this
> file (In LANDUSE file, 1 = Crop/mixed farming, 2, .... 9. Tundra, A.
> Irrigated Crop, .... ). I want to change the parameters in BATS
> vegetation cover, meanwhile keep the vegetation type in region.
> > > 
> > > In addition,I find ../Main/Commons/bats.cb, But I don't know how
> to adjust the parameters inside the model to change vegetation cover.
> > > ; 
> > > Any suggestions would be greatly appreciated.
> > > Regards,
> > > 
> > > 
> > > alisaliu
> > > 
> > > 
> > > 
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