Frank Flocke, Aaron Swanson, Jim Roberts, Greg Huey, David Tanner Tom Ryerson, Andy Neuman ,
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Transcript of Frank Flocke, Aaron Swanson, Jim Roberts, Greg Huey, David Tanner Tom Ryerson, Andy Neuman ,
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Fast time resolution airborne measurements of PANs during the
New England Air Quality Study 2004 intensive.
Frank Flocke, Aaron Swanson, Jim Roberts, Greg Huey, David TannerTom Ryerson, Andy Neuman,
John Holloway, Joost deGouw, Carsten Warneke
Elliot Atlas, Stephen Donnelly, Sue Schauffler, Verity Stroud
Thanks to: NOAA AOC, Paul Stock (DLR)
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New PAN-CIGAR instrument:• Chemical Ionization Mass Spectrometer• Based on reaction of PA radicals with I-
• Fast (time resolution 0.25 – 2 seconds)• Sensitive (10-60 cts/pptv on background of
250 cts or less)• Very selective• Autonomous• Eight different PAN species measured during
ICARTT 2004• don’t miss the PAN-CIGAR Instrument talk:
Swanson et al., A42B-04; Thu, 11:20; MCC 3018Tropospheric Photochemistry II
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Which PANs were measured?Example flight 7/20/2004, NYC plume
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PAN (pptv) PPN (pptv) PBN (pptv) PBzN (pptv) APAN (pptv) MoPAN (pptv) Flt. Altitude (m)
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Biomass burning plume encountered over Quebec 7/28/2004
Flight alt. const. 3000m
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PAN PPN PBN APAN PBzN MoPAN
Flight alt. 3000m
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Biomass burning plume encountered over Quebec 7/28/2004
Flight Alt. const. 3000m
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PAN PPN PBN APAN PBzN MoPAN NOy_3
Flight alt. 3000m
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PAN transport and NOx release
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Flight Altitude (m) PAN Ozone (ppbv) NOx (pptv) HNO3 (pptv) NOy (pptv) CH3CN (arb.)
7/20/2004 Biomass burning plume from AK and CDN FiresPAN is dominant NOY component, HNO3 washed out or lost on aerosols,
PAN decomposition maintains NOX on air mass descent
τ(PAN) ≈ 20h
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Flight Altitude (m) PAN Ozone (ppbv) NOx (pptv) HNO3 (pptv) NOy (pptv) Acetonitrile (arb.)
7/21/2004 Same biomass burning plume from AK and CDN Fires encountered again over Cape Cod one day later
Some processing has occurred (HNO3 formation), still PAN decomposition maintains NOX on air mass descent
τ(PAN) ≈ 18h
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Biomass Burning during ICARTT
don’t miss
Joost de Gouw, A51G-05; Fri, 9:15, MCC 3018Tropospheric Photochemistry VI
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PAN / PPN ratio
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What controls the PAN / PPN ratio:
Production: -PAN / PPN ratio upon formation depends on availability of source VOC
-Alkanes/Alkenes make PAN and PPN (ratio?)-Isoprene and Terpenes make just PAN
PAN/PPN increases with biogenic HC burden More PAN further away from sources (?)
and loss: warm PBL: -Thermal loss is fastest
-PAN is lost faster than PPN (Kirchner et al., 2000)
PAN / PPN decreases (hours-days)
Upper Troposphere: -Photolysis dominates-PPN photolysis slightly faster than PAN
(Harwood et al., 2003)
PAN / PPN increases very slowly (weeks)
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PAN / PPN ratio:
Is there an “anthropogenic” PAN/PPN ratio?
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PAN/PPN during TRACE-P
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pFW_PAN_pptv PAN_100_160 PAN_160_200 PAN_200_240 PAN_US Fit_100_160 slope = 5.6 Fit_160_200 slope = 6.1 Fit_200_240 slope = 9.0 Fit_US slope = 6.2
Slope ~ 6
Similar slopes of PAN / PPN were obtained in Houston (TexAQS 2000),
during TOPSE (Spring 2000) and in/over other urban areas
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PAN / PPN ratio:
and in New England?
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151050NOy (pptv)
7/20/2004 flight
Slope~6
Slope~12
Slope~9
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PAN PPN Flt. Altitude PAN / PPN MVK + MACR (arbitr.)
7/31/2004 Flt, NYC Plume at NightBiogenic influence reflected in PAN/PPN ratio
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PAN / PPN ratio:
Can we see the effect of different thermal loss rates?
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Flight 8/10/2004 – NYC Plume at Night
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Flight 8/10/2004 – NYC Plume at Night
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io PAN PPN PAN/PPN Flt. Altitude
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Flight 8/10/2004 – NYC Plume at Night
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Flight 8/10/2004 – NYC Plume at Night
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SUMMARY• First fast time resolution airborne measurements of
PAN• We observed 8 different PANs including
first observations of MoPAN, PPeN (and PBzN)• Elevated APAN and MoPAN in biomass burning plumes• One can learn a lot about photochemical history of
air masses by just measuring PAN and PPN accurately
• We can do that now at 2 Hz or better• Biomass burning plumes show distinct PAN/PPN
ratio which appears preserved over several days