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Carbon Cycle & Ecosystems

The blue-green band-ratio algorithms for chlorophyll concentration, designed for global applications, are generally not applicable for coastal and inland waters because 1) the optical properties are often dominated by constituents that do not co-vary, particularly with phytoplankton, and 2) it is difficult to obtain accurate surface reflectance in the blue wavelengths due to imperfect atmospheric correction. We propose to evaluate and refine ocean-color algorithms into an innovative algorithm package which will be used to generate reliable satellite water-quality products for coastal and inland waters. The algorithm package will focus on chlorophyll-a ([Chl]), water clarity (zeu), and concentration of total suspended sediments ([TSS]), collectively named BIOP3. Specifically, we propose five activities: 1. Use euphotic depth (zeu) to unify the measurement and remote sensing of water clarity, and refine the current zeu algorithm to improve product quality; 2. Refine [Chl] algorithms through improvement of fluorescence line height (FLH); 3. Refine [TSS] algorithms by removing contributions from phytoplankton particulates; 4. Improve product spatial resolution by incorporating MODIS 250 m and 500 m resolution bands and by using MERIS full-resolution data; and 5. Demonstrate the refined data products for several estuaries and lakes through an existing, widely-used online visualization and analysis tool (Giovanni). Our approach has two distinctive characteristics. One, it is physics-based, where analytical or semi-analytical algorithms will be used. Two, it is specifically designed to avoid the blue bands (412 and 443 nm), where surface reflectance often contains large uncertainties due to imperfect atmospheric correction. Thus, this project will provide water-quality data products with significantly improved accuracy compared to the current "state of the art". This project is designed to specifically address the requirement of this RFP to develop advanced algorithms for coastal and inland water-quality observations from satellite measurements. The project will contribute to the NASA Science Mission Directorate strategic goal I(a), and it also fits the goals of the Gulf of Mexico Alliance to study water quality and nutrient inputs around the Gulf states.

Project PI: ZhongPing Lee/Northern Gulf Institute

Stennis Space Center 108,1103 Balch Blvd Stennis Space Center, MS 39529

Phone: (228) 688-3085

Email: zplee@ngi.msstate.edu

http://www.northerngulfinstitute.org/directory/profile.php?eid=1876

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Started: Aug 10, 2010

Last Activity: Dec 16, 2010

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