Science Modules / Macroalgae

We approach the model by including a core state variable HALO, that is made up of above ground (AG) and below ground (BG); the former referring to the leaves, and the latter the cumulative mass of rhizomes and roots.

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Variable Summary & Setup Options

Variable Name Description Units Variable Type Core/Optional
MAC_{Group} macrophyte group $$mmol C\,m^{-2}$$ - core
Variable Name Description Units Variable Type Core/Optional
diag_PAR benthic light intensity $$W\,m^{-2}$$ - -
GPP benthic plant productivity $$\,d^{-1}$$ - -
P2R macrophyte p:r ratio - - -
MAC total macrophyte biomass $$mmol C\,m^{-2}$$ - -
LAI macrophyte leaf area density $$m^{2}\,m^{-2}$$ - -
MAC_ag total above ground macrophyte biomass $$mmol C\,m^{-2}$$ - -
MAC_bg total below ground macrophyte biomass $$mmol C\,m^{-2}$$ - -
Parameter Name Description Units Parameter Type Default Typical Range Comment
num_mphy number of macrophyte groups - integer 0-5 -
the_mphy list of ID's of groups in aed_phyto_pars.nml (len=num_phyto) - integer 1 - 5 -
n_zones total number of active material zones - integer - - -
active_zones Active material Zone ID's - array - - -
dbase link to mphy database - string - - -
simStaticBiomass switch to enable static biomass simulation - boolean .false. - -
simMacFeedback switch to enable macrophyte feedback simulation - boolean .false. - -
m_name name of macrphyte group - string - - -
m0 minimum above ground density of macrophyte $$mmol C\,m^{-2}$$ float 2e-01 - -
R_growth maximum growth rate at 20C $$mmol C\,m^{-2}\,day^{-1}$$ float 2 - -
fT_Method specific temperature limitation function of growth - integer 0-1 -
theta_growth Arrenhius temperature scaling for growth function - float 1e+00 - -
T_std standard temperature deg C float 20 - -
T_opt optimum temperature deg C float 20 - -
T_max maximum temperature deg C float 20 - -
lightModel type of light response function - integer 0-1 -
I_K half saturation constant for light limitation of growth $$microE\,m^{-2}\,s^{-1}$$ float 180 - -
I_S saturation light intensity used if lightModel=1 $$microE\,m^{-2}\,s^{-1}$$ float 100 - -
KeMAC specific attenuation coefficient - float 4e-03 - -
f_pr fraction of primary production lost to exudation - float 3e-02 - -
R_resp respiration loss rate at 20C $$mmol C\,m^{-2}\,day^{-1}$$ float 2e-02 - -
theta_resp Arrhenius temperature scaling factor for respiration - float 1e+00 - -
salTol type of salinity limitation function - float - -
S_bep salinity limitation value at miximum falinity s_maxsp - float 1 - -
S_maxsp maximum salinity - float 36 - -
S_opt optimal salinity - float 1 - -
K_CD constant relating macrophyte density to drag coefficient $$mmol C\,m^{-3}\,day^{-1}$$ float - -
f_bg fraction of primary production apportioned to below-ground biomass $$mmol C\,m^{-3}\,day^{-1}$$ float - -
k_omega Omega constant relating plant density to effective area of coverage $$W\,m^{-2}$$ float - -
Xcc internal C:chla ratio of the plant leaves - float 50 - -
K_N half saturation concentration of nitrogen - float 2e+00 - -
X_ncon constant internal nitrogen concentration - float 2e-01 - -
K_P half saturation concentration of phosphorus - float 3e-01 - -
X_pcon constant internal phosphorus concentration $$kg\,m^{-3}$$ float 9e-03 - -

An example nml block for the macrophyte module is shown below. NOTE: Users must supply a valid "aed2_macrophyte_pars.nml" file.

&aed2_macrophyte num_mphy = 1 the_mphy = 3 n_zones = 4 active_zones = 2,3,4,5 simStaticBiomass = .true. simMacFeedback = .false. dbase = '../External/AED2/aed2_macrophyte_pars.nml' /



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