Land-Ocean Interactions in the Coastal Zone

LOICZ - Calculator

by M. Ponti and G. Giordani

WORKSHOP
LaguNet

Simple Biogeochemical Budgets Calculator for one box - one layer model following the guidelines provided by Gordon et al. (1996). For further information visit the LOICZ web site.

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Provide the requested information (* necessary fields):

Area name Country  

Author's name(s)
Affiliation 
E-mail
   
Coordinates 

(Units in Decimal Degrees)

North + South -

West + East -

   

Period N of days *

  Area Volume Salinity [DIP] [DIN]
  * km2 (103 m3) (psu) (mmol m-3) (mmol m-3)

System 

depth m

* * * *

Sea

-

-

* * *
           
Inputs/outputs Flow Salinity [DIP] [DIN]
(negative flows are outputs from the system) (103 m3 d-1) (psu) (mmol m-3) (mmol m-3)
Precipitation mm period-1 * * * *
Evaporation mm period-1 *      
Ground water   * * * *

Others

Typology Flow Salinity DIP DIN
#  1
#  2
#  3
#  4
#  5
#  6
#  7
#  8
#  9
# 10
# 11
# 12
# 13
# 14
# 15

For the stoichiometric calculations define the C:N:P ratio for primary producers

C : N : P

Redfiled ratio for phytoplankton is 106:16:1

Atkinson & Smith ratio for macroalgae is 335:35:1


Results

Water and Salt Budget

Residual flow to the sea (VR) 103 m3 d-1
Average salinity at the boundary (SR) psu
Exchange flow between system and sea (VX) 103 m3 d-1
Turnover time (t) d

Nutrients Budget

DIP DIN      
Average concentrations at the boundary (YR) mmol m-3      
Daily load from precipitation (VDIYp) mol d-1      
Daily load from ground water (VDIYg) mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Daily load from mol d-1      
Total load during study period kg period-1      
DIP DIN DIP DIN  
Residual exchange between system and sea (VRDIYR) mol d-1 kg period-1
Exchange between system and sea (VXDIYX) mol d-1 kg period-1
Total sea-lagoon fluxes (negative = export) mol d-1 kg period-1
Difference: sources - sinks (DDIY) mol d-1 kg period-1
Daily difference: sources - sinks (DDIY) per m-2 mmol m-2 d-1      

The system act as:

 

 

 

Stoichiometric calculations

Net Ecosystem Metabolism: p - r (NEM) mmol m-2 d-1
Based on the NEM, the system globally is  
Expected DDIN mmol m-2 d-1

Difference between atmospheric nitrogen fixation

and denitrification processes (Nfix-denit)

mmol m-2 d-1

Reference

Gordon, Jr., D. C., P. R. Boudreau, K. H. Mann, J.-E. Ong, W. L. Silvert, S. V. Smith, G. Wattayakorn, F. Wulff and T. Yanagi, 1996. LOICZ Biogeochemical Modelling Guidelines. LOICZ Reports & Studies No 5, 1-96.