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CALIPSO

Validation of mission CALIPSO and airborne polarimetric studies, August 17-20 2009 (Norfolk, VA)

Objective:

This work was intended to make measurements of water optical properties in variable water conditions for the validation of the CALIPSO mission and airborne measurements with instruments having polarization sensitivity.

Collaborators:

BORG lead by Dr. Richard Zimmerman of Old Dominion University (ODU).

Instruments and methods:

One of the instruments was our multiangular hyperspectral polarimeter which measures polarized radiances and provides data on the linear degree of polarization at various scattering (viewing) angles, and for the whole visible part of the spectra with about 3nm resolution. Additional instruments deployed by the ORS Lab included the Absorption and Attenuation Meter+, the LISST-100X, and the GER 1500 for reflectance spectra. Measurements were carried out in the Atlantic Ocean, approximately 20 25 miles away from the shore of Norfolk, VA, near the entrance of Chesapeake Bay and in the Bay. The group from ODU had similar instruments to measure water optical properties and reflectance spectra which permitted further data comparison and validation.


MURI

2009 MURI Topic 7, June 11-26 2010 (Corpus Christi and Gulf of Mexico)

Objective:

Measure IOPs and AOPs (focusing on polarization) in deep (oceanic) and shallow (seagrass and sand-dominated benthos) waters at different times of the day, including sunrise/sunset (which are the maximum predation times of fish under investigation). Conduct lab experiments on candidate fish in artificial polarization environments.

Collaborators:

Dr. Molly Cummings, Dr. Parrish Brady, Dr. Tara Maginnis (University of Texas); Dr. Heidi Dierssen, Brandon Russel, Kate Randolph (University of Connecticut); Dr. James Sullivan (University of Rhode Island) and Dr. Heather Groundwater, Scott Freeman (WET Labs); Dr. Richard Zimmerman (Old Dominion University);

Research Vessel information:

For shallow waters, small crafts were available through MSI (the Marine Science Institute of the University of Texas at Austin), like the Shearwater and the Skimmer (click here for description). For open ocean waters (in proximity of oil rigs, 20 miles away from shore), the Kingfisher of Deep Sea Headquarters (click here for description).

Instruments and methods:

    Field efforts:

  • IOPs of the water medium were measured by several WET Labs instruments, including the MASCOT, which was modified to measure polarization.
  • Benthic reflectances were measured by Dr. Heidi Dierssen and Dr. Richard Zimmerman.
  • The ORS Lab polarimeter profiled the angular features of the underwater polarized light field, thanks to the help of skilled divers.

    Fish experiments:

  • Large water tanks were set up and had controlled polarization. Several fish species (flounder, lookdown, pinfish, etc.) were filmed with the full-Stokes-vector video polarimeter developed by Dr. Parrish Brady of University of Texas.


Workshop

Above Water Radiometry Workshop, August 4-6 2010 (Long Island Sound and Peconic Bay, LI)

Objective:

Revise and update the Ocean Optics Protocol for Satellite Ocean Color Validation for measurement of remote sensing reflectance (Rrs) from an above-surface platform.

Collaborators:

T. Wynne and R. Stumpf, NOS; Z. Lee, MSU; C. Johnson, NIST; M. Ondrusek, NESDIS; G. Fargion, CHORS-SDSU; R. Arnone, R. Amin and S. Ladner, NRL.

Research Vessel information:

Stony Brook University: click here for description.

Methods:

  • Coordinate measurements with each lab and with NIST.
  • Collect data sets at same location using several radiometers from different labs and process the data to obtain Rrs.
  • Document and compare how each lab collects and how processes the data to obtain Rrs.
  • Compare Rrs derived from above-surface measurements with Rrs from below-surface measurements. Quantify uncertainties.

Outcome:

  • A document to unify common procedures and processing for Rrs from above-water radiometry.
  • Collected data sets at same location using several radiometers from different labs and processed the data to obtain Rrs.
  • Documented the protocols on how each lab collects and processes the data to obtain Rrs.
  • Coordinated the protocols with each lab and with NIST.
  • Used the data set to determine the uncertainty and compile a document. The revised protocol resulted in a common procedures and processing for Above Water Radiometry.

Instruments deployed by the groups:

  • Spectralon cards (NRL, MSU, NOS, ORS Lab, NESDIS, NIST), Calibration card (NIST), WET Labs package (ac-s, bb-9, CTD) and LISST 100-X (ORS Lab), Hyperpro (Satlantic) (NESDIS).



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merchantability and fitness for a particular purpose arising out of the use or inability to use the data presented herein.


Program Code Copyright © Thomas Legbandt 2010 - 2016


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