With support from NASA we have instrumented
moorings located at 0°N 155°W and 2°S 170°W with irradiance, radiance, absorption
and beam attenuation meters. Above the sea we measure downwelling irradiance at SeaWiFS
wavelengths. Just below the sea surface we measure upward radiance, absorption and beam
attenuation in SeaWiFS wavelengths. At 20 m we measure downward irradiance and upward
radiance at SeaWiFS wavelengths. At 10m and 30m we will augment the downward irradiance
measurements with single channel 490 nm sensors. With the 490 nm sensors at 10, 20 and 30
m we can calculate the 490 nm attenuation coefficient and be able to propagate 490 nm to
just below the air-sea interface. Using the ratio of the above surface measurement of 490
nm to propagated to just below the surface we estimate irradiance just below the sea
surface for the other SeaWiFS wavelengths. With the attenuation coefficients and the
measured radiances we then calculate water leaving radiances.
A portion of our data is available in near real-time via service ARGOS. We log most of the data on the mooring and
transmit a set of noon-time measurements to coincide with the satellite
data are automatically processed into geophysical parameters and the raw and derived
properties provided in near real-time to NASA.
View the low-frequency data pathway (via
In addition, whenever opportunity permits, usually every 6 months, data is downloaded
directly from the moorings. In addition to calculating the standard products mentioned
above, daily and 15 minute averages are derived.
View the high-frequency data pathway (via
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Last Updated: 16 June, 2003