Privacy Policy and Important Notices
Updated: Monday, 10-Nov-2008 11:54:27 EST
The SeaWiFS Bio-optical Algorithm Mini-Workshop (SeaBAM)
was held at UCSB in January 1997 to finalize the operational
SeaWiFS chlorophyll a and CZCS-pigment algorithms.
Participants invited to the workshop agreed to submit
their algorithms for testing using a common data set,
which came to be known as the SeaBAM evaluation
data set. The outcome of SeaBAM was a consensus
chlorophyll algorithm (OC2) that was used initially
for processing SeaWiFS data (O’Reilly et al.
1998). This algorithm has since been replaced with
an improved algorithm, OC4.v4, that was parameterized
with an enlarged data set (n = 2,853) (O’Reilly
et al. 2000). MODIS uses a similar algorithm, OC3M,
based on the same data set.
Recently, NASA has assembled data from 3,467 stations
into NOMAD, which includes much more information than
the SeaBAM data set (Werdell and Bailey 2005). NOMAD
provides station locations and dates, chlorophyll
by either HPLC or fluorometric methods, SST by either
CTD or from the Reynolds/NOAA Climate Diagnostics
Center weekly OISST observations (Reynolds et al.
2002), and spectral radiance measurements in 20 bands from
405 to 683 nm. The spectral measurements are downwelling
diffuse attenuation coefficient, Kd(λ),
water-leaving radiance, Lw(λ), and
downwelling surface irradiance, Es(λ).
In addition to these data, inherent optical properties
(IOPs), such as absorption and backscattering coefficients,
have been merged with the NOMAD data where
available.
The official Evaluation Data Set is a subset of the full NOMAD data set. It contains an index which allows for cross-referencing with the full NOMAD data set. The initial compilation of NOMAD is described in Werdell and Bailey 2005. The document "An evaluation of Inherent Optical Property data for inclusion in the NASA bio-Optical Marince Algorithm Data set" gives details on the IOP data within the data set.
Privacy Policy and Important Notices
Updated: Monday, 10-Nov-2008 11:54:27 EST