Global Carbon Cycle Example
Global Carbon Cycle Example
Hi, Anyone have any global carbon cycle examples for vensim. I cant set my units and will be crazy soon So, I need working examples and i ll be pleasure. I searched forum but link dead or topic was locked. Thanks all
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Re: Global Carbon Cycle Example
If you want to upload your model, we might be able to help solve the units problem.
Advice to posters seeking help (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Units are important!
http://www.bbc.co.uk/news/magazine-27509559
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Units are important!
http://www.bbc.co.uk/news/magazine-27509559
Re: Global Carbon Cycle Example
http://metasd.com/2014/07/free/
http://metasd.com/2010/06/dice/
Generally, atmospheric CO2 is measured in GtC (gigatons carbon), with the corresponding emissions and uptake flows in GtC/year. But you'll often find emissions in GtCO2 terms - a ton of CO2 is 44/12 tons of C.
http://metasd.com/2010/06/dice/
Generally, atmospheric CO2 is measured in GtC (gigatons carbon), with the corresponding emissions and uptake flows in GtC/year. But you'll often find emissions in GtCO2 terms - a ton of CO2 is 44/12 tons of C.
/*
Advice to posters (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Blog: http://blog.metasd.com
Model library: http://models.metasd.com
Bookmarks: http://delicious.com/tomfid/SystemDynamics
*/
Advice to posters (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Blog: http://blog.metasd.com
Model library: http://models.metasd.com
Bookmarks: http://delicious.com/tomfid/SystemDynamics
*/
Re: Global Carbon Cycle Example
I found this on internet. But it gives error when i check units. I cant fix this. And i really dont know what is the wrong... If you help, i ll be pleasure. Thank you.
- Attachments
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- Carboncycle.mdl
- (5.76 KiB) Downloaded 183 times
Re: Global Carbon Cycle Example
This model has a lot of parameters embedded as numbers in equations. For example:
That's bad practice. What does 92 mean, and what are its units?
All parameters should be separate variables with assigned units, so they're properly dimensioned and exposed to sensitivity testing.
Code: Select all
***********************************************
Error in units for the following equation:
CO2 absorption =
92
* ( Atmosphere
/ 750)
CO2 absorption --> Gt/yr
Atmosphere --> Gt
Analysis of units error:
Right hand and left hand units do not match
CO2 absorption
Has Units: Gt/yr
92
* ( Atmosphere
/ 750)
Has Units: Gt
***********************************************
All parameters should be separate variables with assigned units, so they're properly dimensioned and exposed to sensitivity testing.
/*
Advice to posters (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Blog: http://blog.metasd.com
Model library: http://models.metasd.com
Bookmarks: http://delicious.com/tomfid/SystemDynamics
*/
Advice to posters (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Blog: http://blog.metasd.com
Model library: http://models.metasd.com
Bookmarks: http://delicious.com/tomfid/SystemDynamics
*/
Re: Global Carbon Cycle Example
If you post your error, we might be able to help. Also, the models I posted should be error-free.
/*
Advice to posters (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Blog: http://blog.metasd.com
Model library: http://models.metasd.com
Bookmarks: http://delicious.com/tomfid/SystemDynamics
*/
Advice to posters (it really helps us to help you)
http://www.ventanasystems.co.uk/forum/v ... f=2&t=4391
Blog: http://blog.metasd.com
Model library: http://models.metasd.com
Bookmarks: http://delicious.com/tomfid/SystemDynamics
*/