Lightning NOx measurements during and after DC3
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Transcript of Lightning NOx measurements during and after DC3
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Lightning NOx measurements during and after DC3
Harold Peterson: USRAArastoo Biazar, Mike Newchurch,
Wesley Cantrell: UAH
GLM Science Meeting, Huntsville, ALSeptember 19, 2012
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Motivation
• Lightning NOx has been measured by:– Aircraft– Satellite– Laboratory– Chambers capturing rocket-triggered lightning– Models
• What has yet to be done is a simple measurement near thunderstorms
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Experiment design
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Experiment design
• So simple a baby could do it? (Well, almost…)
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Detailed measurements
NLDN Lightning image is for 5:00-5:15 p.m. local time, with SW winds at the surface advecting in NOx (all NO2)
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Detailed measurements
Lightning image on left is for 5:45-6:00 p.m. local time, with N to NE winds at site; slight time lag in CG lightning to NOx increase (mostly NO2)
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Detailed measurements
Lightning image is for 5:00-5:15 p.m. local time; SSE winds at the time of the increase in NOx (mostly NO2)
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Conclusions
• Lightning NOx has a signal that is unique from anthropogenic NOx– Lower amplitude (sometimes), longer duration, NO2
instead of NO– Larger than background NOx, so we know there is an
additional source above and beyond concurrent anthropogenic NOx
– No wildfires present in the area during the measurement period, so there are no other natural NOx sources
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Conclusions
• Consequence 1: Larger than normal peaks in NOx concentration may result from an anthropogenic event superimposed on a lightning event (compare July 6 and July 7 morning NOx)
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Conclusions
• Consequence 2 (TBD): Similar effects are predicted for lightning ozone
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Acknowledgements
• Thank you to Solomon Bairai and TVA for loaning us a calibrated NOx detector
• NLDN lightning images are from the Global Hydrology Research Center
• Wind direction maps are from Kevin Knupp’s berm instruments