Eco Light Irradiance calculations for coupled ecosystem models

Eco. Light: Irradiance calculations for coupled ecosystem models Curtis D. Mobley and Lydia K. Sundman Sequoia Scientific, Inc. Redmond, WA In collaboration with Paul Bissett Florida Environmental Research Institute Tampa, FL Work supported by U. S. Navy ONR Hy. CODE Program Hy. CODE Jan 2002

Goals • develop an extremely fast version of Hydrolight (Eco. Light) for use in coupled physical-biologicaloptical ecosystem models [Status: done] • incorporate Eco. Light into Eco. Sim as a called subroutine [Status: in final debugging] • quantify the improvements in ecosystem forecasts resulting from improved irradiance calculations [Status: this year’s work] Hy. CODE Jan 2002

The Big Picture Ecosystem Model Regional Ocean Modeling System (ROMS) component concentrations light Preprocessor: converts Eco. Sim output to total IOPs Hy. CODE Eco. Sim total IOP’s, etc. Eo, Ed, Rrs Eco. Light subroutine solves the RTE Jan 2002

Hydrolight vs Eco. Light Case 2 water (water + phytos + CDOM + minerals) Hydrolight (red): 880 sec; Eco. Light (green) 2. 8 sec (Eco. Light details are available in Eco. Light 3. 0 Notes) Hy. CODE Jan 2002

Related Work Showed that the Fournier-Forand phase function as determined from bb/b(z, ) is a good proxy for measured phase functions. Illustrated with LEO-15 2000 data (Mobley, Sundman and Boss, Appl. Opt. (in press) H, Petzold pf Hyper-TSRB H, measured pf OCP Hy. CODE H, FF pf Jan 2002