Download - 050405 Epa Satellite
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Satellite Data Us in PM Management:A Retrospective Assessment
Rudolf B. HusarCAPITA, Washington University
Presented at A&WMA’s 97th Annual Conference and ExhibitionJune 22-27, Indianapolis, IN
MexicanSmoke
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Early Satellite Detection of Manmade Haze, 1976
Regional Haze
Low Visibility Hazy ‘Blobs’Lyons W.A., Husar R.B. Mon. Weather Rev. 1976
SMS GOES June 30 1975
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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 97th Annual Conference and ExhibitionJune 22-27, Indianapolis, IN
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April 29, 2000, Day 120 July 18, 2000, Day 200 October 16, 2000, Day 290
Results – Seasonal surface reflectance, Eastern US
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SeaWiFS Satellite Platform and Sensors
• Satellite maps the world daily in 24 polar swaths
• The 8 sensors are in the transmission windows in the visible & near IR
• Designed for ocean color but also suitable for land color detection, particularly of vegetation
Swath
2300 KM
24/day
Polar Orbit: ~ 1000 km, 100 min.
Equator Crossing: Local NoonChlorophyll Absorption
Designed for Vegetation Detection
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Satellite Aerosol Optical Thickness ClimatologySeaWiFS Satellite, Summer 2000 - 2003
20 Percentile
99 Percentile90 Percentile
60 Percentile
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Satellite AOT – Time Fraction (0-100%)SeaWiFS Satellite, Summer 2000 - 2003
Dec, Jan Feb
Sep, Oct, NovJun, Jul, Aug
Mar, Apr, May
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SeaWiFS AOT – Summer 60 Percentile1 km Resolution
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Technical Challenge: Characterization
• PM characterization requires many different instruments and analysis tools.
• Each sensor/network covers only a limited fraction of the 8-D PM data space.
• Most of the 8D PM pattern is extrapolated from sparse measured data.
• Some devices (e.g. single particle electron microscopy) measure only a small subset of the PM; the challenge is extrapolation to larger space-time domains.
• Others, like satellites, integrate over height, size, composition, shape, and mixture dimensions; these data need de-convolution of the integral measures.
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What kind of neighborhood is this anyway?
May 9, 1998 A Really Bad Aerosol Day for N. America
Asian Smoke
C. American Smoke
Canada Smoke
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Near Real Time Public Satellite Data Delivery
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Interactive Virtual Workgroup WebsitesJuly 2002 Quebec Smoke
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Summary
• Satellite data have aided the science of Particulate Matter since the 1970s
• Satellite data have supported PM air quality management since the 1990s.
• Past satellite data helped the qualitative description of PM spatial pattern
• Quantitative satellite data use and fusion with surface data is still in infancy
• Satellite data applications will require collaboration across disciplines
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April 29, 2000, Day 120 July 18, 2000, Day 200 October 16, 2000, Day 290
Results – Seasonal surface reflectance, Western US
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Results – Eight month animation
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Apparent Surface Reflectance, R• The surface reflectance R0 is obscured by aerosol scattering and absorption before it reaches the sensor
• Aerosol acts as a filter of surface reflectance and as a reflector solar radiation
Aerosol as Reflector: Ra = (e-– 1) P
R = (R0 + (e-– 1) P) e-
Aerosol as Filter: Ta = e-
Surface reflectance R0
• The apparent reflectance , R, detected by the sensor is: R = (R0 + Ra) Ta
• Under cloud-free conditions, the sensor receives the reflected radiation from surface and aerosols
• Both surface and aerosol signal varies independently in time and space
• Challenge: Separate the total received radiation into surface and aerosol components
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Information Techology Vision Scenario: Smoke ImpactREASoN Project: Application of NASA ESE Data and Tools to Particulate Air Quality Management (PPT/PDF)
• Scenario: Smoke form Mexico causes record PM over the Eastern US.
• Goal: Detect smoke emission and predict PM and ozone concentrationSupport air quality management and transportation safety
• Impacts: PM and ozone air quality episodes, AQ standard exceedanceTransportation safety risks due to reduced visibility
• Timeline: Routine satellite monitoring of fire and smokeThe smoke event triggers intensified sensing and analysisThe event is documented for science and management use
• Science/Air Quality Information Needs:Quantitative real-time fire & smoke emission monitoring PM, ozone forecast (3-5 days) based on smoke emissions data
• Information Technology Needs:Real-time access to routine and ad-hoc data and modelsAnalysis tools: browsing, fusion, data/model integrationDelivery of science-based event summary/forecast to air quality and
aviation safety managers and to the public
Record Smoke Impact on PM Concentrations
[email protected], [email protected]
Smoke Event