Thursday, August 12, 2010

Parameterization of the SIPNET model for your site

If you have a forested eddy covariance site, it should be possible to parameterize the model using previous studies at the site and by assimilating the data from the site.
You will need to assemble the appropriate climate divers and you will also need to estimate the parameters used to drive model

You can find a description of the model drivers and parameters on this website:

Figure shows the layout of a small portion of a parameter file used by SIPNET - click on the image for a more detailed view.

Not all of the parameters in the default 'dot.param' file are used. The parameters which are required depend on the model options that you employ. I recommend that you look carefully at the model options at the start of the code in the file "sipnet.c". We hope to create an improved interface for changing SIPNET options but for now we need to manually change the options in the sipnet.c code (... and remember to recompile!).

The options include options to vary how respiration or little is treated, whether growing degree days are calculated etc. written by Bill Sacks and Rob Braswell (see Braswell et al 2005, Sacks et al 2006, 2007). They also include options written by John Zobitz to include various soil pools (see Zobitz et al 2008).

You might also want to check out the previous blog post (from March).

Please speak to one of the SIPNET team before you use SIPNET for publication so that you have access to the most up to date version of the code. The code is hosted at the University of Wisc and will be moved during the fall of 2010.

Dave Moore (King’s College London), John Zobitz (Augsburg College), Bill Sacks (NCAR/NEON), Ankur Desai (Univ Wisc)

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