Developing npp algorithms for the arctic
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Developing NPP algorithms for the Arctic. 1. Empirical chlorophyll based algorithm. Chukchi Sea. ANCOVA H 0 – means between light levels are equal. P < 0.00 , H 0 is rejected. 1. Empirical chlorophyll based algorithm. Chukchi Sea. 1. Empirical chlorophyll based algorithm. Resolute Bay.

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Ancova h 0 means between light levels are equal
ANCOVA H0 – means between light levels are equal

P < 0.00 , H0 is rejected




Ancova h 0 means between light levels are equal1
ANCOVA H0 – means between light levels are equal

P < 0.00 , H0 is rejected





Ancova h 0 means between regions are equal
ANCOVA H0 – means between regions are equal

P < 0.00 , H0 is rejected


1 empirical chlorophyll based algorithm6
1. Empirical chlorophyll based algorithm

Combined dataset

Log PP = 1.36 + 1.0.LogChl

  • Average Chlorophyll

  • Resolute Bay 8.1 mg m-3

  • Barents Sea 4.2 mg m-3

  • Chukchi Sea1.2 mg m-3

  • ANCOVA

  • Chl 0.8 – 32 mg m-3

  • P < 0.01





2 model based on c chl ratios
2. Model based on C:Chl ratios

  • Behrenfeld et al. (2005) developed a productivity model based on Chl:C ratios

  • and chlorophyll concentrations derived from ocean color satellite observations.

  • Carbon (POC) is retrieved from backscatter

  • Chlorophyll is retrieved from Rrs ratios (i.e OC4V4, OC3M or OC3Arc)

  • These are coupled with mixed layer light levels from surface PAR and K490

  • observations and growth rates estimated from the literature. The final equation is:

  • NPP = C . µ . Zeu. h(Io)

  • Where C is carbon, µ is growth rate, Zeu is the euphotic depth and h(Io) describes how

  • changes in surface light influence the depth dependent profile

  • of carbon fixation



2 model based on c chl ratios2
2. Model based on C:Chl ratios

  • Model Input

  • Carbon (POC) is retrieved from backscatter – Behrenfeld global relationship

  • Chlorophyll is retrieved from Rrs ratios - OC3Arc

  • Surface PAR – estimated from observations

  • Mixed layer light levels – estimated from observations

  • Growth rate – literature global, 0.5 – 2 divisions d-1

  • h(Io) taken from Behrenfeld and Falkowski (1997)

  • NPP = C . µ . Zeu . h(Io)

  • Model output

  • 1. NPP euphotic zone integrated - g C m-2 day-1
















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