Transcript Ozone Detection and Monitoring

Ozone Detection
and Monitoring
A Satellite Tutorial
By:
Gabriel Langbauer
NASA Presents TOMS!!!
• Total Ozone Mapping Spectrometer
• Launched June 29, 1996 aboard the
satellite “Earth-Probe”
• Monitors Ozone over a column from
the surface up to the top of the
atmosphere
•1 D.U. corresponds to the amount of gas at STP that forms a layer .001 cm thick
How Do They Do It?
• TOMS measures total ozone by
observing both incoming solar
energy and backscattered nearultraviolet radiation at six
wavelengths:
0.3086, 0.3125, 0.3175, 0.3223,
0.3312, and 0.360 micrometers
• By comparing the amount of
backscattered radiation to observations
of incoming solar energy at identical
wavelengths, one can calculate the
Earth's albedo
• Changes in albedo at the selected
wavelengths can be used to derive the
amount of ozone above the surface.
• The ozone is related to albedo, latitude,
surface pressure, and area covered
Coverage
• Makes 35 measurements every 8 seconds
(approximately 1 measurement every 0.2s)
• Each measurement covers 50km on the
ground
• 200,000 daily measurements cover every
single spot on the Earth except areas near
one of the poles, where the Sun remains
close to or below the horizon during the
entire 24-hour period.
Satellite Specifications
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Orbits at 739km AGL
Japanese ADEOS orbits at 800km
Accurate within 2% of Total Ozone
Weight of 33.1 KG
Data Rate of 700bps
Power of 25 Watts
Orbital period of 99 minutes 42 seconds
Questions?!?!?!