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Developing NPP algorithms for the ArcticPowerPoint Presentation

Developing NPP algorithms for the Arctic

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### Developing NPP algorithms for the Arctic

1. Empirical chlorophyll based algorithm

Chukchi Sea

ANCOVA H0 – means between light levels are equal

P < 0.00 , H0 is rejected

1. Empirical chlorophyll based algorithm

Chukchi Sea

1. Empirical chlorophyll based algorithm

Resolute Bay

ANCOVA H0 – means between light levels are equal

P < 0.00 , H0 is rejected

1. Empirical chlorophyll based algorithm

Resolute Bay

1. Empirical chlorophyll based algorithm

Barents Sea

1. Empirical chlorophyll based algorithm

Combined dataset

ANCOVA H0 – means between regions are equal

P < 0.00 , H0 is rejected

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

- 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 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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