root_brent

Author:

Bart Nijssen

Date:

April 1996

Description:

Computes the snow pack surface temperature for which the sum of the energy balance is zero.

References

Brent, R. P., 1973, Algorithms for minimization without derivatives, Chapter 4. Prentice Hall, Inc., Englewood Cliffs, New Jersey.

Input Variables:

This function has a variable argument list. The following must be specified.

Variable	Type	Units	Description
LowerBound	double	deg C	lower bound for root, which is a function of snow.surf_temp
UpperBound	double	deg C	upper bound for root, hard coded to zero
SnowPackEnergyBalance	function *	N/A	see function documentation for description, the arguments for this function are passed as the optional arguments

Output Variables:

Variable	Type	Units	Description
b	double	deg C	effective surface temperature

Subroutines Called:

SnowPackEnergyBalance

Modifications and Limitations

Although the documentation associates this function with the snow code, it is infact general purpose. Macro definitions are included in this routine to specify the maximum number of iterations and the precision.

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