[Dhsvm-users] an error: Root not bracketed in RootBrent(): RootBrent: y = 37, x = 473

[Keith Adams]

Gooday Caiyangcong and other users,

I thing the RootBrent message indicates that an intermediated result during the computer run has gone outside the expected range.

In an email of 5 Jun 2006, Laura Bowling wrote:

"Your problem in RootBrent indicates an instability in the energy balance calculations, so the actual problem is probably occurring much early in the model. I recommend checking all of your input time series carefully to look for any out of range values. (Like temperatures of -200 or precipitation of -999.)"

A search of the User Group archives might find other references to this problem.

Hope this helps.

Regards,
Keith.





***
Keith N. Adams,  Research Fellow
School of Environment, The University of Auckland
Postal:    Private Bag 92019, Victoria Street West, Auckland 1142, NEW ZEALAND
Email:     k.adams at auckland.ac.nz<mailto:k.adams at auckland.ac.nz>
Phone:     +64 9 373 7599  ext. 83886   Direct:  +64 9 923 3886
Physical:  Room 437, Building 201N (HSB), 10 Symonds Street
***
________________________________
From: dhsvm-users-bounces at mailman2.u.washington.edu [dhsvm-users-bounces at mailman2.u.washington.edu] on behalf of caiyangcong [onion-20062006 at 163.com]
Sent: Friday, 10 February 2012 4:48 p.m.
To: dhsvm-users at u.washington.edu
Subject: [Dhsvm-users] an error: Root not bracketed in RootBrent(): RootBrent: y = 37, x = 473

 Dear DHSVM users,
       When running the DHSVM, I am having the following error:
                                                Initializing dump procedures
                                                Initializing snow map
                                                Restoring model state
        !                                         changing LAI, albedo and diffuse transmission parameters
                                                01/05/2002-00:00:00
                                                01/06/2002-00:00:00
             &nb! sp;                                  Root not bracketed in RootBrent(): RootBrent: y = 37, x = 473

     I have been trapped by this error for months, but still could't find a solition to it.  Did anyone give me some tips. I would hightly appreciate any comment on this. Thank you!!


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