1 / 16

Evaluating two approaches to the Bio-Optical Model for Coastal Waters

Evaluating two approaches to the Bio-Optical Model for Coastal Waters. Mimi Szeto Research and Discover Fellow Candidate for UNH MS, Oceanography Advisor: Dr. Janet W. Campbell. Background: Primary Productivity. Phytoplankton. Primary Productivity. Photosynthesis.

semah
Download Presentation

Evaluating two approaches to the Bio-Optical Model for Coastal Waters

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Evaluating two approaches to the Bio-Optical Model for Coastal Waters Mimi Szeto Research and Discover Fellow Candidate for UNH MS, Oceanography Advisor: Dr. Janet W. Campbell

  2. Background: Primary Productivity Phytoplankton Primary Productivity Photosynthesis National Oceanography Centre, Southhampton

  3. Marine Ecosystems Fisheries Oak Ridge National Library Background: The Big Picture The Global Carbon Cycle NOAA MIT

  4. Ocean Color Algorithms The OC4.v4 and OC3M Algorithms at work The SeaWiFS Sensor NASA SeaWiFSProject NASA Bio-Optical Relationship Light <=> Phytoplankton (absorption and scattering) NASA

  5. Ocean Color Algorithms The OC4.v4 and OC3M Algorithms at work The SeaWiFS Sensor NASA SeaWiFSProject NASA Bio-Optical Relationship Light <=> Phytoplankton Inherent Optical Properties (IOP) Apparent Optical Properties (AOP) (absorption and scattering) NASA

  6. AOP Rrs IOP absorption and scattering IN-WATER CONSTITUENTS chlorophyll Bio-Optical Models Semi-Analytical Algorithms Empirical Algorithms

  7. AOP IOP chl Objective: Comparing two approaches to the Bio-Optical Model • Underdog Model: Sydor, 2007 • Popular Model: Gordon, 1988 KEY: IOPs: a = absorption bb= backscattering b=scattering AOP: Rrs= Remote Sensing Reflectance

  8. AOP IOP chl Method • Three different in situ data sets for comparing and sensitivity analysis: • COOA- Gulf of Maine • CalCOFI – Monterey Bay, California • BBOPs – Bermuda • Simulating Datasets: • HYDROLIGHT • in situIOPs  modeled rrs • Closure

  9. What I have so far! • Compare plots of in situ data • Rrs vs bb /(a+bb) and Rrs vs b/a • Run COOA IOPs in Hydrolight • Current Problem: too many parameters • WINDSPEED

  10. Showdown: Gordon vs. Sydor Wavelengths 412 443 490 510 555 670

  11. Recap. and Overall Purpose • AOP – IOP : Foundation of semi-analytical algorithms • Main goal: • Reduce uncertainty incurred in ocean color algorithms for coastal regions. • Improve estimate of PRIMARY PRODUCTIVITY AOP IOP chl

  12. Acknowledgements • Janet Campbell, Ph. D. • Tim Moore, Ph. D. • Research and Discover Fellowship • Jeremy Werdell, GSFC • Joe Salisbury, Ph. D. • Ru Morrison, Ph. D. • Doug Vandemark, Ph. D. • Amanda Plagge, Deb Goodwin, and Shivanesh Rao • COOA and NASA Ocean Color Processing Group

  13. Problem with Wind Speed • Example of one station at different depths.

  14. Objective: Comparing two approaches to the Bio-Optical Model • Component: Sydor, 2007 • Multiple scattering Underdog Equation AOP: Remote sensing Reflectance IOPs: a = absorption bb= backscattering

  15. AOP IOP chl IOPSIn-Water Constituents Remote Sensing Equation ABSORPTION water plankton CDOM and non-algal particles BACKSCATTERING water particles

  16. AOP IOP chl IOPSIn-Water Constituents a or bb = [magnitude] x (spectral shape) WATER CDOM AND NAP PLANKTON 2.5 1.0 0.008 2.0 0.8 0.006 S a*(l) 0.6 1.5 Absorption 0.004 0.4 1.0 0.002 0.2 0.5 0.0 0.000 0.0 600 400 500 600 700 400 500 700 400 500 600 700 Wavelengths Wavelengths Wavelengths

More Related