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PRIMARY PRODUCTION Project Start Date: January 1, 2005

Launched on January 1, 2005, this project aims to provide reliable ocean productivity data products using chlorophyll and carbon-based algorithms. With three standard products and multiple optional algorithms, we aim to establish consistency across measurements of primary production. Key project milestones include the kickoff letter to OPPWG, presentations at the MODIS Ocean Color Meeting, and an emphasis on a unified standard product. Supporting resources include field data, alternative models, and visualization tools to enhance understanding for decision-makers and educators alike.

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PRIMARY PRODUCTION Project Start Date: January 1, 2005

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  1. 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

  2. Download standard products #1 • The Ocean • Productivity • Home Page • Overview • Navigation Description of standard products Thumbnails comparing standard product with alternative algorithms • Standard Products • DIM w/ polynomial rate • DIM w/ exponential rate • Carbon-based production

  3. Download standard products Link MODIS land • Biospheric NPP • Products • MODIS • CASA #1 Link CASA site • The Ocean • Productivity • Home Page • Overview • Navigation Description of standard products Thumbnails comparing standard product with alternative algorithms #2 Supporting Field Data -14C -Fluorescence • Custom • Products • Alternative models • Statistical compare • Short description Link Rutgers site #3 DIMs History Discussion of the Productivity Problem TIMs Model Evolution Full description Order Alternative products WIMs Links to related sites Basics #4 WRMs Photosynthesis Model Code Physiology Round Robin Results Outstanding problems Highlights #7 Space/Time convergence #6 Visualization Products Educational Products #5 Images Decision/Policy Information Trends Course Work Pub’s Statistics Implications Intro to Ocean Color Interactive Products

  4. Backup Slides

  5. 700  = 400 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 Zeu z = 0 Zeu z = 0 sunset t = sunrise sunset t = sunrise      Ocean Model Classifications I. Wavelength-resolved models II. Wavelength-integrated models III. Time-integrated models IV. Depth-integrated models

  6. Form of Rate Term Polynomial Exponential GCM’s

  7. f (Iz) Io / Ik 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)

  8. Light limitation dominates Light-Nutrient interactions Light versus Nutrient as dominant control Pbopt (max) Temperature

  9. 1500 1200 800 Net Primary Production (mg m-2) 400 0 800 400 0 Difference (mg m-2) -400 -800 NPP = f [Carbon, Zeu, , g (I0)] Boreal Summer Boreal Winter Carbon-based Chlorophyll-based Difference

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