2004-06-24 Co-retrieval of Aerosol and Surface Reflectance: Analysis of Daily US SeaWiFS Data for 2000-2002

Co-retrieval of Aerosol and Surface Reflectance: Analysis of Daily US SeaWiFS Data for 2000-2002 Sean Raffuse, Erin Robinson and Rudolf B. Husar CAPITA, Washington University Presented at A&WMA’s 97 th Annual Conference and Exhibition June 22-27, Indianapolis, IN

Radiation detected by satellites ,[object Object],[object Object],[object Object],[object Object]

SeaWiFS Satellite Platform and Sensors ,[object Object],[object Object],[object Object],Chlorophyll Absorption Designed for Vegetation Detection Swath 2300 KM 24/day Polar Orbit: ~ 1000 km, 100 min. Equator Crossing: Local Noon

Aerosol effects on surface color and Surface effects on aerosol color The image was synthesized from the blue (0.412 μm), green (0.555 μm), and red (0.67 μm) channels of the 8 channel SeaWiFS sensor. Air scattering has been removed to highlight the haze and surface reflectance.

Preprocessing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

General Approach: Co-Retrieval of Surface and Aerosol Reflectance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scattering angle correction 2 ,[object Object]

Approach – Time Series Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object]

Methodology – Cloud shadows ,[object Object],[object Object],[object Object],[object Object]

Methodology – Preliminary anchor days ,[object Object],[object Object],[object Object],[object Object]

Surface Reflectance in Blue & Red, Illinois ,[object Object],[object Object],[object Object],[object Object],Clouds Haze

Methodology – Residual haze reduction ,[object Object],[object Object]

Results – Seasonal surface reflectance, Eastern US April 29, 2000, Day 120 July 18, 2000, Day 200 October 16, 2000, Day 290

Results – Seasonal surface reflectance, Western US April 29, 2000, Day 120 July 18, 2000, Day 200 October 16, 2000, Day 290

Results – Eight month animation

Apparent Surface Reflectance, R ,[object Object],[object Object],Aerosol as Reflector: R a = ( e -  – 1 ) P R = ( R 0 + ( e -  – 1 ) P ) e -  Aerosol as Filter: T a = e -  Surface reflectance R 0 ,[object Object],[object Object],[object Object],[object Object]

Aerosol Retrieval: Idaho Smoke Event, Aug 2000 ,[object Object],[object Object],[object Object],[object Object]

July 10, 2002 July 9, 2002 July 8, 2002 July 7, 2002 July 6, 22002 July 5, 2002

Discussion - Advantages ,[object Object],[object Object],[object Object],[object Object],[object Object]

2004-06-24 Co-retrieval of Aerosol and Surface Reflectance: Analysis of Daily US SeaWiFS Data for 2000-2002

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2004-06-24 Co-retrieval of Aerosol and Surface Reflectance: Analysis of Daily US SeaWiFS Data for 2000-2002