Difference between revisions of "Nitrogen-phosphorus model"

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== '''Description of the Nitrogen and Phosphorus Model.''' ==
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[[Image:N-P_model_diagram.png|right|thumb|300px|A schematic of the modelled nitrogen and phosphorus cycles.  The unlabelled arrows leading into the phytoplankton ('''O''' and '''NF''') indicate the biological uptake of nitrate and phosphate.]]
  
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The '''nitrogen-phosphorus model''' is a first-order description of the major source and sink terms in the ocean's nitrogen and phosphorus cycles, and the feedback loops that connect these.  The model builds upon the simpler [[phosphorus model]].
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==Overview==
 
This model is very simple. It is stripped down to the simplest form that can still reproduce the nitrogen (N) and phosphorus (P) cycles. That is to say, the simplest form that is still able to capture the main aspects of how atoms of nitrogen and phosphorus enter the ocean, are transported about within it, and then finally leave the ocean. The aim of this model is to understand how the nitrate:phosphate ratio of the ocean is regulated, and also how the amount of plants in the ocean, and therefore the fertility of the ocean as a whole, are controlled.  
 
This model is very simple. It is stripped down to the simplest form that can still reproduce the nitrogen (N) and phosphorus (P) cycles. That is to say, the simplest form that is still able to capture the main aspects of how atoms of nitrogen and phosphorus enter the ocean, are transported about within it, and then finally leave the ocean. The aim of this model is to understand how the nitrate:phosphate ratio of the ocean is regulated, and also how the amount of plants in the ocean, and therefore the fertility of the ocean as a whole, are controlled.  
  
[[Image:NP model.png|centre|600px]]
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The diagram above shows how the oceanic cycles of nitrogen and phosphorus are represented in the model. As well as including the same cycling of phosphorus as in the phosphorus-only model, the model also represents how atoms of nitrogen enter and leave different substances (for instance, bodies of living organisms or molecules of dinitrogen and nitrate) during their time in the oceans.
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The model is a  two-[[box model]] of the global ocean, where the upper box represents the surface ocean down to the seasonal limit of the deepest wind-induced mixing and the lower box represents the deep ocean below the influence of wind and waves.  
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Click here for [[Nitrogen-phosphorus model details|a more detailed description of the nitrogen-phosphorus model]].
  
The diagram above shows how the oceanic cycles of nitrogen and phosphorus are represented in the model. As well as including the same cycling of phosphorus as in the phosphorus-only model, the model also represents how atoms of nitrogen enter and leave different substances (for instance, bodies of living organisms or molecules of dinitrogen and nitrate) during their time in the oceans.  
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==Further information==
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* [[Nitrogen-phosphorus model details]]
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* [[Nitrogen-phosphorus model pros]]
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* [[Nitrogen-phosphorus model cons]]
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==References==
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* Tyrrell, T. (1999).  [http://www.nature.com/nature/journal/v400/n6744/abs/400525a0.html The relative influences of nitrogen and phosphorus on oceanic primary production].  ''Nature'' '''400''', 525–531.
  
The model is a  two-box model of the global ocean. Or, in other words, the model consists of two boxes, one on top of the other. The top box represents the surface ocean down to the limit of the deepest wind-induced mixing during the year and the bottom box represents the deep ocean below the influence of wind and waves.
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==External links==
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* [http://en.wikipedia.org/wiki/Nitrogen Description of the chemical element nitrogen], [[Wikipedia]]
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* [http://en.wikipedia.org/wiki/Nitrogen_cycle Description of the nitrogen cycle], [[Wikipedia]]
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* [http://en.wikipedia.org/wiki/Phosphorus Description of the chemical element phosphorus], [[Wikipedia]]
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* [http://en.wikipedia.org/wiki/Phosphorus_cycle Description of the phosphorus cycle], [[Wikipedia]]
  
Click here for [[NPModel|'''a more detailed description of the nitrogen-phosphorus model.''']]
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[[Category:Biogeochemistry]]
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[[Category:Nitrogen model]]
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[[Category:Phosphorus model]]

Revision as of 17:22, 27 March 2008

A schematic of the modelled nitrogen and phosphorus cycles. The unlabelled arrows leading into the phytoplankton (O and NF) indicate the biological uptake of nitrate and phosphate.

The nitrogen-phosphorus model is a first-order description of the major source and sink terms in the ocean's nitrogen and phosphorus cycles, and the feedback loops that connect these. The model builds upon the simpler phosphorus model.

Overview

This model is very simple. It is stripped down to the simplest form that can still reproduce the nitrogen (N) and phosphorus (P) cycles. That is to say, the simplest form that is still able to capture the main aspects of how atoms of nitrogen and phosphorus enter the ocean, are transported about within it, and then finally leave the ocean. The aim of this model is to understand how the nitrate:phosphate ratio of the ocean is regulated, and also how the amount of plants in the ocean, and therefore the fertility of the ocean as a whole, are controlled.

The diagram above shows how the oceanic cycles of nitrogen and phosphorus are represented in the model. As well as including the same cycling of phosphorus as in the phosphorus-only model, the model also represents how atoms of nitrogen enter and leave different substances (for instance, bodies of living organisms or molecules of dinitrogen and nitrate) during their time in the oceans.

The model is a two-box model of the global ocean, where the upper box represents the surface ocean down to the seasonal limit of the deepest wind-induced mixing and the lower box represents the deep ocean below the influence of wind and waves.

Click here for a more detailed description of the nitrogen-phosphorus model.

Further information

References

External links