SIPNET

SIPNET background information

SIPNET is a simplified version of the PnET ecosystem model. SIPNET has been designed specifically for the assimilation of eddy covariance flux data (CO2 and H2O fluxes). After assimilation, the model yields optimal predictions of CO2 and H2O fluxes at a half-daily time step. The model currently runs only in point mode (where the spatial domain - i.e. the size of the "point" - is defined as the tower footprint), but a spatial version is being developed, which will use satellite observations of FPAR and/or GPP in the assimilation. The role of SIPNET in the ACME project will be to provide initial guess flux values for RAMS.
The following links give additional information about SIPNET:

• Draft of a paper describing SIPNET, the associated parameter estimation procedure, and its application to eddy covariance data from Harvard Forest (2 MB).
• Draft of a paper on the application of SIPNET to Niwot Ridge (750 kB).
• Another paper on the application of SIPNET to Niwot Ridge (150 kB); note: figures NOT included.
• Schematic of new soil moisture sub-model implemented for Niwot site.
• Figures showing results of model run with initial guess parameter values and optimized parameter values at Niwot. Comparisons of both half-daily NEE and integrated cumulative NEE, as well as carbon pool dynamics predicted by optimized model.