sub-hourly variation of tropospheric ozone profiles measured by the huntsville dial shi kuang 1*,...
TRANSCRIPT
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
The Team
Photo: Front: (left to right) Whitney Guerin, Stephanie Long, Shi Kuang. Back: (left to right) John Burris, Mike Newchurch, Steve Johnson
Outline
• Instrument description.• Aerosol corrections.• Validation against balloon sondes.• Data• Conclusions.
Dye Laser
The Instrument
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).
Model
Glued signal with SIB correction
Glued signal w/o SIB correction
SIB fit
Aerosol model
Calculated aerosol
O3 model
O3 w/o aerosol correction
O3 with aerosol correction
ModelS=40, η=0.5S=40, η=0S=40, η=1S=20, η=0.5S=60, η=0.5
Typical statistical errors for day and nighttime ozone retrievals on the high and low altitude channels
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.
The mean and standard deviation of the ozone retrieval in last slide.
August 9-10, 2008
August 17-18, 2008
Oct. 5, 2008 Nighttime Ozone Enhancement
Similar aerosol and O3 time-height structures suggest a same pollutant source.
8-hour peak Air Quality Index for ozone at Mississippi/Alabama region in October 2008
This was Sat.!
Horizontal Transport
24-hr Backtrajectories at 500, 1500 and 4000m for the nighttime ozone enhancement event observed in Huntsville on Oct. 5, 2008.
October 18, 2008
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.