Ozone Detection Ozone Detection and Monitoringand Monitoring

A Satellite Tutorial A Satellite Tutorial By:By:

Gabriel LangbauerGabriel Langbauer

NASA Presents TOMS!!!NASA Presents TOMS!!!

• Total Ozone Mapping SpectrometerTotal Ozone Mapping Spectrometer

• Launched June 29, 1996 aboard the Launched June 29, 1996 aboard the satellite “Earth-Probe”satellite “Earth-Probe”

• Monitors Ozone over a column from Monitors Ozone over a column from the surface up to the top of the the surface up to the top of the atmosphereatmosphere

•1 D.U. corresponds to the amount of gas at STP that forms a layer .001 cm thick1 D.U. corresponds to the amount of gas at STP that forms a layer .001 cm thick

How Do They Do It?How Do They Do It?

• TOMS measures total ozone by TOMS measures total ozone by observing both incoming solar observing both incoming solar energy and backscattered near-energy and backscattered near-ultraviolet radiation at six ultraviolet radiation at six wavelengths:wavelengths:0.3086, 0.3125, 0.3175, 0.3223, 0.3086, 0.3125, 0.3175, 0.3223, 0.3312, and 0.360 micrometers0.3312, and 0.360 micrometers

• By comparing the amount of By comparing the amount of backscattered radiation to observations backscattered radiation to observations of incoming solar energy at identical of incoming solar energy at identical wavelengths, one can calculate the wavelengths, one can calculate the Earth's albedoEarth's albedo

• Changes in albedo at the selected Changes in albedo at the selected wavelengths can be used to derive the wavelengths can be used to derive the amount of ozone above the surface.amount of ozone above the surface.

• The ozone is related to albedo, latitude, The ozone is related to albedo, latitude, surface pressure, and area coveredsurface pressure, and area covered

CoverageCoverage

• Makes 35 measurements every 8 seconds Makes 35 measurements every 8 seconds (approximately 1 measurement every 0.2s)(approximately 1 measurement every 0.2s)

• Each measurement covers 50km on the Each measurement covers 50km on the groundground

• 200,000 daily measurements cover every 200,000 daily measurements cover every single spot on the Earth except areas near single spot on the Earth except areas near one of the poles, where the Sun remains one of the poles, where the Sun remains close to or below the horizon during the close to or below the horizon during the entire 24-hour period.entire 24-hour period.

Satellite SpecificationsSatellite Specifications

• Orbits at 739km AGLOrbits at 739km AGL

• Japanese ADEOS orbits at 800kmJapanese ADEOS orbits at 800km

• Accurate within 2% of Total OzoneAccurate within 2% of Total Ozone

• Weight of 33.1 KGWeight of 33.1 KG

• Data Rate of 700bpsData Rate of 700bps

• Power of 25 WattsPower of 25 Watts

• Orbital period of 99 minutes 42 secondsOrbital period of 99 minutes 42 seconds

Questions?!?!?!Questions?!?!?!