Evaluation of Six Relations of Kinetics of Uptake by Phytoplankton in Multi-nutrient Environment Using JGOFS Experimental Results
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Evaluation of Six Relations of
Kinetics of Uptake by
Phytoplankton in Multi-nutrient
Environment Using JGOFS
Experimental Results
|
|
| Creator |
M K, Sharada
K S, Yajnik P S, Swathi |
|
| Subject |
Ocean Modelling
|
|
| Description |
Inhibitory effect of ammonium on nitrate uptake, which has received fair
amount of attention, is an example of uptake kinetics of phytoplankton in multinutrient
environment with nutrient interaction. We examine six relations
(Wroblewski, 1977; O’Neill et al., 1989; Walsh & Dugdale, 1971; Jamart et al., 1977;
Parker, 1993; Yajnik & Sharada, 2002) governing the uptake of nitrate and
ammonium by phytoplankton in the context of nitrogen dynamics experiments of
McCarthy et al.(1999) in the Indian Ocean. One of the relations (Yajnik & Sharada,
2002), which is based on the properties of similarity and hyperbolicity, is shown to
represent the experimental observations more accurately than others. We then
examine the consequences of selection of one of these kinetic relations on 0D and 3D
simulations of marine ecosystem. The simulations of the former type are carried out
for the mixed layer using a seven component ecosystem model due to Fasham et al.
(1990). The resulting seasonal variations of chlorophyll are compared with SeaWiFS
data at selected stations in the Indian Ocean. The latter simulations are based on the
biological model due to Fasham et al (1990) coupled to a physical oceanographic
model (Sarmiento et al., 1993) and they are performed for three relations
(Wroblewski, 1977; O’Neill et al., 1989; Yajnik & Sharada, 2002). The values of
kinetic parameters are determined from the experiments of McCarthy et al.(1999).
The spatial variation of annual average primary productivity, especially in the regions
of high primary productivity in the northern Indian Ocean, is found to agree most
favourably with SeaWiFS data for the relation (Yajnik & Sharada, 2002) based on
similarity and hyperbolicity. The distribution of particle export ratios also appears to
be close to current expectations.
|
|
| Publisher |
CSIR Centre for Mathematical Modelling and Computer Simulation
|
|
| Date |
2003-05
|
|
| Type |
Monograph
NonPeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cir.cmmacs.ernet.in/202/1/rrcm0303new.pdf
M K, Sharada and K S, Yajnik and P S, Swathi (2003) Evaluation of Six Relations of Kinetics of Uptake by Phytoplankton in Multi-nutrient Environment Using JGOFS Experimental Results. Technical Report. CSIR Centre for Mathematical Modelling and Computer Simulation, C-MMACS,Bangalore 560037,India. (Unpublished) |
|
| Relation |
http://cir.cmmacs.ernet.in/202/
|
|