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Polarized Radiance Distribution in-water and sky Aerosol Optical Depth in Santa Barbara Channel Exp. Kenneth Voss, Purushottam Bhandari, Luke Logan Physics Department, University of Miami. Measurement overview.
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Polarized Radiance Distribution in-water and skyAerosol Optical Depthin Santa Barbara Channel Exp. Kenneth Voss, Purushottam Bhandari, Luke Logan Physics Department, University of Miami
Measurement overview • Measure in-water polarized radiance distribution, both upwelling and downwelling using the DPOL instrument. • Measure Sky polarized radiance distribution, using a sky camera with sequential polarization filters. • Measure the ancillary parameter of aerosol optical depth, using hand held microtops sunphotometer.
Measurements performed off of Flip • Sky camera on face boom • Downwelling DPOL measurements done off of Starboard boom, working into the general schedule. • Upwelling DPOL measurements done by floating DPOL away from FLIP on it’s own floats. • Microtops measurements done while other measurements were being performed.
Daily Summary • 9/9/08: Sky camera and Microtops • 9/10/08: Sky, DPOL downwelling, Microtops • 9/11/08: Sky camera and Microtops • 9/12/08: no measurements • 9/13/08: Sky, DPOL downwelling, Microtops • 9/14/08: Sky camera and Microtops • 9/15/08: Sky camera, DPOL upwelling, Microtops • 9/16/08: Sky camera and Microtops • 9/17/08: Sky camera, DPOL upwelling, Microtops • 9/18/08: Sky camera, DPOL Downwelling, Microtops • 9/19/08: Sky camera, DPOL upwelling, Microtops • 9/20/08: no measurements • 9/21/08: Sky camera and Microtops • 9/22/08: Sky camera, DPOL downwelling, Microtops • 9/23/08: Sky camera, DPOL downwelling, Microtops 5 days DPOL Downwelling, 3 days DPOL upwelling, 5 days only Sky camera. Only 2 days with no sampling.
Microtops data • Aerosol optical depth larger at beginning of cruise, but almost always over the typical marine value of 0.1 • Angstrom exponent higher than 1, also not typical of a “clean” marine atmosphere. Certainly influenced by S. Cal. • Data and description will be on my website by end of the month
Sky Camera Measurements almost every day. Learned that many connectors needed to be weather hardened (actually knew, but we ran out of time.
Will have pdf’s like this on web server, along with the image files for the specific values.Expect to have this done by end of month.
DPOL data • Have been spending all the time since the cruise working on extensive recharacterization and calibration. • Biggest issue is flatfielding the system to get rid of fiber bundle issues:
