Changes between Version 1 and Version 2 of EwEugContaminantTracing


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Timestamp:
2010-03-15 12:33:22 (9 years ago)
Author:
shermanl
Comment:

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  • EwEugContaminantTracing

    v1 v2  
    88 
    99In Ecosim we allow parallel simulation of one tracer or contaminant type while the biomass dynamics equations are being solved.  Tracer molecules are assumed to be either in the “environment”, or in the biota (in biomass and detritus pools) at any moment.  Molecules are assumed to flow between pools at instantaneous rates (i.e. to be sampled along with biomass during biomass flows at rates) equal to the probabilities of being “sampled” as part of the biomass flow: instantaneous rate=(flow)/(biomass in prey pool).  We also allow for direct flows from the environment into pools, representing direct uptake or absorption of the tracer material, and for differential decomposition/decay/export rates by pool and from the environmental pool.  Schematically, the flow of tracer molecules through any biomass pool is represented by the components shown below:  
    10  
    11 Your browser may not support display of this image. In the rate equation for time changes in contaminant concentration in pool i, these components are represented as follows: 
     10               [[Image(http://sources.ecopath.org/trac/Ecopath/raw-attachment/wiki/EwEugContaminantTracing/image004.png)]] 
     11[[Image(http://sources.ecopath.org/trac/Ecopath/raw-attachment/wiki/EwEugContaminantTracing/image005.png)]] 
     12In the rate equation for time changes in contaminant concentration in pool i, these components are represented as follows: 
    1213 
    1314   1.  Uptake from food: C,,''j'',,GC,,''i'',,Q,,''ji'',,/B,,''j'',, where C,,''j'',,=conc in food ,,''j'',,, GC,,''i'',,=proportion of food assimilated by type ,,''i'',, organisms; Q,,''ji'',,=biomass flow rate from ,,''j'',, to ,,''i'',,, B,,''j'',,=food ,,''j'',, biomass;