HR: 1340h
AN: A43D-0127    [Abstracts]
TI: Interannual Variability of Photosynthetically Active Radiation from SeaWiFS
AU: * Su, W
EM: w.su@larc.nasa.gov
AF: Hampton University, MS 420 NASA Langley Research Center, Hampton, VA 23681-2199 United States
AU: Loeb, N
EM: n.g.loeb@larc.nasa.gov
AF: Hampton University, MS 420 NASA Langley Research Center, Hampton, VA 23681-2199 United States
AB: Longterm variations in surface solar insolation affects our climate. Photosynthetically active radiation (PAR) covers the solar spectrum from 400 nm to 700 nm, and contributes about 40% to the total shortwave radiation at the surface. PAR data from SeaWiFS over the global ocean surface are available since the fall of 1997. The SeaWiFS instrument is rigorously calibrated to maintain its on-orbit radiometric stability, including monthly lunar calibrations and daily solar calibrations. Seven-years of SeaWiFS PAR data are analyzed and the preliminary results show no statistically significant temporal trend in the PAR over the ocean from 50oS to 50oN. Time series of SeaWiFS PAR will be analyzed for other regions and compared with the time series of top-of-atmosphere shortwave irradiance from CERES.
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
DE: 3359 Radiative processes
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005