[Dhsvm-users] Humidity not adjusted for elevation in DHSVM 3.0?

[cuol at u.washington.edu]

Hi Richard,

Erin said that you found a bug in ET calculation. Is the following email dealt with the problem?

Lan

On Fri, 16 Nov 2007, Richard Gwozdz wrote:


> Hello group,

>

> I've noticed that relative humidity does not appear to be adjusted for 

> elevation in DHSVM 3.0.  Instead, humidity is simply interpolated between 

> stations.  From MakeLocalMet.c:

>

> LocalMet.Rh += CurrentWeight * Stat[i].Data.Rh;

>

> If your catchment is large and topographical complex, I think this could 

> introduce considerable bias in ET calculations.

>

> Liston and Elder (2006) dealt with this problem in their distributed 

> meteorology model:

>

> Liston, G. E., and K. Elder. 2006. A meteorological distribution system for 

> high-resolution terrestrial modeling (MicroMet). Journal of Hydrometeorology 

> *7*:217-234.

>

> It requires making some assumption about the way dewpoint lapses, but I think 

> it might be worth adding to the next version of DHSVM.

>

> Rich

>

> -- 

> Rich Gwozdz

> Fire and Mountain Ecology Lab

> College of Forest Resources University of Washington

> cell: 206-769-6808 office: 206-543-9138

> rgwozdz at u.washington.edu

>

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