NPP Products

NPP Product Family Description

The ocean color products available here were made using Level 3, 8 day, binned imagery from SeaWiFS and MODIS-Aqua. There are two principal products: results from the Vertically Generalized Productivity Model (VGPM) and the Carbon-based Productivity Model (CbPM).

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VGPM:

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Full description of the VGPM model can be found here:

http://www.science.oregonstate.edu/ocean.productivity/vgpm.model.php

The NPP grids are 2160x4320, SMI-like format. Files are stored in HDF format, gzipped.

For Seawifs-based VGPM NPP calculations, SeaWiFS chlor_a, PAR, and AVHRR sst products are used to compute NPP.

The file naming convention is:
vgpm.YYYYddd.hdf.gz where ddd is the start of the 8 day interval.

For Aqua-based VGPM NPP calculations, MODIS (Aqua) chlor_a, PAR, and SST4 are used.

The file naming convention is:
vgpm.YYYYddd.hdf.gz where ddd is the start of the 8 day interval.

These files also are collected by year into tar archives, with the file name convention:
yearlyTarWads/vgpm.[m|s].YYYY.tar

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CbPM:

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Full description of the CbPM model can be found here:

http://www.science.oregonstate.edu/ocean.productivity/carbon2.model.php

The NPP grids are 2160x4320, SMI-like format. Files are stored in HDF format, gzipped.

For Seawifs-based CbPM NPP calculations, SeaWiFS GSM chlorophyll and bbp, k490, and PAR products are used to compute NPP.

The file naming convention is:
cbpm.YYYYddd.hdf.gz where ddd is the start of the 8 day interval.

For Aqua-based CbPM NPP calculations, MODIS (Aqua) GSM chlorophyll and bbp, k490, and PAR products are used.

The file naming convention is:
cbpm.YYYYddd.hdf.gz where ddd is the start of the 8 day interval.

Both SeaWiFS and Aqua-based CbPM computations use FNMOC MLD ( http://www.science.oregonstate.edu/ocean.productivity/mld.html)

These files also are collected by year into tar archives, with the file name convention:
yearlyTarWads/cbpm.[m|s].YYYY.tar where "m" indicates MODIS Aqua based NPP and "s" indicates SeaWiFS based NPP.

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CbPM2:

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Full description of the CbPM2 model can be found here:
http://www.science.oregonstate.edu/ocean.productivity/references/Westberry_GBC_2008.pdf

The NPP grids are 2160x4320, SMI-like format. Files are stored in HDF format, gzipped.

For Seawifs-based CbPM2 NPP calculations, SeaWiFS GSM chlorophyll and bbp, k490, and PAR products are used to compute NPP.

The file naming convention is:
cbpm2.YYYYddd.hdf.gz where ddd is the start of the 8 day interval.

For Aqua-based CbPM NPP calculations, MODIS (Aqua) GSM chlorophyll and bbp, k490, and PAR products are used.

The file naming convention is:
cbpm2.YYYYddd.hdf.gz where ddd is the start of the 8 day interval.

Both SeaWiFS and Aqua-based CbPM2 computations use FNMOC MLD ( http://www.science.oregonstate.edu/ocean.productivity/mld.html) and nitrocline depth (?).

These files also are collected by year into tar archives, with the file name convention:
yearlyTarWads/cbpm2.[m|s].YYYY.tar where "m" indicates MODIS Aqua based NPP and "s" indicates SeaWiFS based NPP.

Data (links to FTP site)

• modis-based 8-day VGPM

• modis-based Monthly VGPM

• modis-based 8-day CbPM2

• seawifs-based 8-day CbPM2

• seawifs-based 8-day VGPM

• seawifs-based Monthly CbPM2

• seawifs-based Monthly VGPM

Metadata

• OSU Field Data (Fluorescence and C-14)

Software

• CbPM code

• VGPM code

• CbPM2 code