MOdel Shopping Tool ( MOST )
"chlorophyll content of phytoplankton" from PISCES v1 Equations
Same equation in other models :
Equation Description :
Chlorophyll for both phytoplankton groups is parametrized using the photoadaptative model f Geider et al. (1998) as shown above, where I is the phytoplankton class and Theta I Chl is the chlorophyll-to-carbon ratio of the considered phytoplankton class. Ro I Chl represents the ratio of energy assimilated to energy absorbed as defined by Geider et al. (1996).
In the second equation the coefficient 144 is the square of the molar mass of C and converts mol to mg as the standard unit for Chl is Chl m-3. For the iron content of phytoplankton, a similar approach has been adopted as iron is mostly related to the photosynthetic apparatus. Thus, the equations predicting the iron content of both phytoplankton groups are exactly equivalent to the equation above.
This parameterization produces variations of the Fe/C ratios which are consistent with the observations: these ratios decrease with light and with the nutrient stress including iron (Sunda and Huntsman, 1997).
Parameters definitions and typical values in PISCES:
alpha = 4 (W m-2)-1 d-1 (Initial slope of the P-I curve);
delta = 0.05 (exudation of DOC);
g M = 0.7 d-1 (max mesozooplankton grazing rate);
g Z = 4 d-1 (max microzooplankton grazing rate);
K = 0.1 micro mol C l-1 (half-saturation k for mortality);
m = 0.01 d-1 (phytoplankton mortality rate);
M = mesozooplankton concentration micro mol C l-1;
mu D = diatom production (see link below);
theta Chl max = 0.033, 0.05 mg Chl mg C-1 (max Chl/C ratios for nanophyto- and diatoms);
w p = phytoplankton aggregation term (link to equation below);
Z = microzooplankton concentration micro mol C l-1;
References:
Geider, R. J., H. L. MacIntyre, and T. M. Kana 1996. Limnol. Oceanogr., 41, 1-15;
Geider, R. J., H. L. MacIntyre, and T. M. Kana 1998. Limnol. Oceanogr., 43, 679-694;
Sunda, W. G., and S. A. Huntsman, 1997. Nature, 390, 389-392;
