Science Modules / Zooplankton

Zooplankton biomass is simulated through the processes of food assimilation and losses from respiration, excretion, egestion, predation and mortality..

aed2_zooplankton : Mass balance and functions related to the phytoplankton model

Net zooplankton growth is calculated as a balance between food assimilation and losses from respiration, excretion, egestion, predation and mortality. Food assimilation is calculated as the product of the maximum potential rate of grazing, assimilation efficiency and temperature and food limitation functions. A constant internal nutrient ratio is assumed for simplicity, and since the various input and output fluxes have variable C:N:P ratios, the excretion of nutrients is dynamically adjusted each time-step to maintain this ratio at each time step.



Variable Summary & Setup Options

The following state variables are core or optional STATE variables within aed2_zooplankton

Variable Name Description Units Variable Type Core/Optional
ZOO_{Group} zooplanton group mmol C m^{-3} pelagic core

The following state variables are core or optional DIAGNOSTIC variables within aed2_zooplankton

Variable Name Description Units Variable Type Core/Optional
GRZ net zooplankton grazing mmol C/m**3/d pelagic diagnostic core
RESP net zooplankton respiration mmol C/m**3/d pelagic diagnostic core
MORT net zooplankton mortality mmol C/m**3/d pelagic diagnostic core

The following parameters and configuration variables are available to be set via the nml module block:


Parameter Name Description Units Parameter Type Default Typical Range Comment
num_zoops number of zooplankton groups - integer 0.0 0-3 -
the_zoops list of ID's of groups in aed_zoo_pars.nml (len=num_phyto) - integer 0.0 1-3 -
dX_target_variable state variable to provide/receive dissolved OM - string - - -
pX_target_variable state variable linked to provided/receive particulate OM - string - - -

An example nml block for the phytoplankton module is shown below.NOTE: Users must supply a valid "aed_zoo_pars.nml" file.

&aed2_zooplankton num_zoops = 1 the_zoops = 1 dn_target_variable='OGM_don' ! dissolved nitrogen target variable pn_target_variable='OGM_pon' ! particulate nitrogen target variable dp_target_variable='OGM_dop' ! dissolved phosphorus target variable pp_target_variable='OGM_pop' ! particulate phosphorus target variable dc_target_variable='OGM_doc' ! dissolved carbon target variable pc_target_variable='OGM_poc' ! particulate carbon target variable /



Examples

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Publications & References

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