Three new data products available from the GSFC Ocean Biology Processing Group (OBPG) have been added to the Ocean Color Radiometry interface in Giovanni. The three new products are Particulate Organic Carbon (POC), Particulate Inorganic Carbon (PIC) and Photosynthetically Available Radiation (PAR). These products are only available in the SeaWiFS.R2009 data set.
Particulate Organic Carbon is made up of organic carbon particles too large to fit throgh the holes of a filter, which generally have pore sizes between 0.25-0.7 µm. Any organic carbon that passes through the filter is called Dissolved Organic Carbon (DOC). POC+DOC are generally referred to as detritus.
Particulate Inorganic Carbon is carbon in the form of the mineral calcium carbonate (CaCO3), mostly as the microscopic discs called coccoliths, produced by coccolithophorids.
Photosynthetically Available Radiation (PAR) refers to the intensity of light in the visible range of the spectrum (400-700 nanometers) that can be utilized by phytoplankton for photosynthesis. PAR is a fundamental variable used for estimates of primary production based on chlorophyll concentration measured by satellite instruments. The unit of PAR is Einsteins per square meter per day; one Einstein is one mole of light photons.
The SeaWiFS PAR products complements other radiance data products now available in Giovanni, in the CERES interface. The GES DISC also provides Total Solar Irradiance from the SORCE mission.
More information on how these data products are computed is found here: Ocean Color Products and Algorithms.