Sub-hourly Variation of Tropospheric Ozone Profiles Measured by the Huntsville DIAL Shi Kuang 1*,...
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![Page 1: Sub-hourly Variation of Tropospheric Ozone Profiles Measured by the Huntsville DIAL Shi Kuang 1*, John Burris 2, M. J. Newchurch 1*, Steve Johnson 3, and.](https://reader035.fdocuments.net/reader035/viewer/2022062217/5697c0061a28abf838cc5ad3/html5/thumbnails/1.jpg)
Sub-hourly Variation of Tropospheric Ozone Profiles Measured by the Huntsville DIAL
Shi Kuang1*, John Burris2, M. J. Newchurch1*, Steve Johnson3, and Stephanie Long4
1 Atmospheric Science Department, University of Alabama in Huntsville, 320 Sparkman Dr., Huntsville, Alabama 35805, USA
2NASA-Goddard Space Flight Center, Code 694, Greenbelt, Maryland 20771, USA
3NASA-Marshall Space Flight Center, Office Code VP61, Huntsville, Alabama 35812, USA
4Department of Physics, University of Alabama in Huntsville, Huntsville, Alabama 35805, USA
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The Team
Photo: Front: (left to right) Whitney Guerin, Stephanie Long, Shi Kuang. Back: (left to right) John Burris, Mike Newchurch, Steve Johnson
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Outline
• Instrument description.• Aerosol corrections.• Validation against balloon sondes.• Data• Conclusions.
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Dye Laser
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The Instrument
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Instrument Characterization
• Telescope’s performance validated.• PMT response function and SIN correction
determined. • LED test - quantified electronic system
response. Established system reliability.• Mini receiver installed.
• LICEL (analog/photon counting) units replaced MCS boards (photon counting).
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Model
Glued signal with SIB correction
Glued signal w/o SIB correction
SIB fit
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Aerosol model
Calculated aerosol
O3 model
O3 w/o aerosol correction
O3 with aerosol correction
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ModelS=40, η=0.5S=40, η=0S=40, η=1S=20, η=0.5S=60, η=0.5
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Typical statistical errors for day and nighttime ozone retrievals on the high and low altitude channels
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Validation of DIAL ozone using balloon sondes
(8AM)
All sondes are launched at 1pm except one at 8am.
Low channel works a little better than high channel. High channel has a oscillation above 6. 285 laser doesn’t have power. High statistical error and SIB error at 7-8 km relatively.
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The mean and standard deviation of the ozone retrieval in last slide.
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August 9-10, 2008
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August 17-18, 2008
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Oct. 5, 2008 Nighttime Ozone Enhancement
Similar aerosol and O3 time-height structures suggest a same pollutant source.
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8-hour peak Air Quality Index for ozone at Mississippi/Alabama region in October 2008
This was Sat.!
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Horizontal Transport
24-hr Backtrajectories at 500, 1500 and 4000m for the nighttime ozone enhancement event observed in Huntsville on Oct. 5, 2008.
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October 18, 2008
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Conclusions
• RAPCD DIAL instrument is retrieving excellent lower tropospheric data.
• Retrievals with aerosol correction have a verified accurate of 5-20% between 1-8 km.
• 24-hr 10-min curtain plots shows many interesting trop O3 features in time and space.