PRIMARY PRODUCTION

• Project Start Date: January 1, 2005- provide ocean productivity data products based on chlorophyll- and carbon-based algorithms (3 standard products, multiple optional algorithms)

• Kick-off letter to OPPWG: January 7,2005 • Project Presented at MODIS Ocean Color Meeting, February 2005

- recommendation to have a single standard product

• Programmer/start: Robert O’Malley, April 2005

Description of standard products

Thumbnails comparing standard product with alternative algorithms

Download standardproducts

The Ocean ProductivityHome Page

-Overview-Navigation

#1

Standard Products• DIM w/ polynomial rate• DIM w/ exponential rate• Carbon-based production

Interactive Products

Course Work

Visualization Products

Intro to Ocean Color

EducationalProducts

#7Highlights

Pub’s

Images#6

Decision/PolicyInformation

Statistics

Trends

Implications

#5

Outstanding problems

Physiology

Basics

Photosynthesis

Links torelatedsites #4 WRMs

WIMs

TIMs

DIMs

Model Evolution

HistoryDiscussion of the Productivity Problem

#3

Space/Time convergence

Round Robin Results

Fulldescription

Model Code

CustomProducts

-Alternative models-Statistical compare-Short description

OrderAlternativeproducts

#2 SupportingField Data-14C-Fluorescence

Biospheric NPPProducts

-MODIS-CASA

LinkMODISland

LinkCASAsite

LinkRutgers

site

Description of standard products

Thumbnails comparing standard product with alternative algorithms

Download standardproducts

The Ocean ProductivityHome Page

-Overview-Navigation

#1

Backup Slides

Ocean Model Classifications

NPP = (,t,z) PAR (,t,z) a*(,z) Chl (z) d dt dz

NPP = (t,z) PAR (t,z) Chl (z) dt dz

NPP = Pb (z) PAR (z) Chl (z) dz

NPP = Pbopt PAR0 Chl0 Zeu d.l.

Zeu

z = 0

700

= 400

sunset

t = sunrise Zeu

z = 0

sunset

t = sunrise Zeu

z = 0

I. Wavelength-resolved models

IV. Depth-integrated models

III. Time-integrated models

II. Wavelength-integrated models

Polynomial Exponential

Form of Rate Term

GCM’s

Net Primary Production = Gross Carbon Fixation – Phytoplankton Respiration

Net Primary Production = mg C m-3 d-1

= number of cells average carbon fixed per cell = biomass biomass specific rate

NPP = Chlorophyll Pb NPP = Carbon

Areal NPP (m-2) = biomass biomass specific rate f (Iz) f (biomassz) f (Kd)

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 5 10 15 20 25

f (I z)

Io / Ik

0

2

4

6

8

10

-5 0 5 10 15 20 25 30

Temperature

Pb opt (

max

)

Light limitation dominates

Light-Nutrientinteractions

Light versus Nutrientas dominant control

Boreal Winter

Chl

orop

hyll-

base

dC

arbo

n-ba

sed

Boreal SummerD

iffer

ence

Difference (m

g m-2)

-800

400

0

-400

800

Net P

rimary P

roduction (mg m

-2)

0

1200

800

400

1500

NPP = f [Carbon, Zeu, , g (I0)]