HR: 11:50h
AN: A42A-07 [Abstracts]
TI: Tropospheric Sources and Distribution of Gas-Phase Ammonia Inferred From Aircraft
Observations
AU: * Nowak, J B
EM: John.Nowak@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309
United States
AU: * Nowak, J B
EM: John.Nowak@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Neuman, J A
EM: Andy.Neuman@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309
United States
AU: Neuman, J A
EM: Andy.Neuman@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Holloway, J S
EM: John.S.Holloway@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309
United States
AU: Holloway, J S
EM: John.S.Holloway@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Parrish, D D
EM: David.D.Parrish@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: deGouw, J A
EM: Joost.deGouw@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309
United States
AU: deGouw, J A
EM: Joost.deGouw@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Warneke, C
EM: Carsten.Warneke@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309
United States
AU: Warneke, C
EM: Carsten.Warneke@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Ryerson, T B
EM: Thomas.B.Ryerson@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Flocke, F
EM: ffl@ucar.edu
AF: National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307
United States
AU: Swanson, A
EM: aswanson@ucar.edu
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309
United States
AU: Swanson, A
EM: aswanson@ucar.edu
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Swanson, A
EM: aswanson@ucar.edu
AF: National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307
United States
AU: Brock, C A
EM: Charles.A.Brock@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309
United States
AU: Brock, C A
EM: Charles.A.Brock@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Wollny, A
EM: Adam.Wollny@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309
United States
AU: Wollny, A
EM: Adam.Wollny@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Trainer, M
EM: Michael.K.Trainer@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AU: Fehsenfeld, F C
EM: Fred.C.Fehsenfeld@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305
United States
AB:
Observations of gas-phase ammonia (NH3) during the New England Air Quality Study - Intercontinental Transport and
Chemical Transformation (NEAQS - ITCT) complement to the International Consortium for Atmospheric Research on Transport and
Transformation (ICARTT) are described. NH3 was measured aboard the NOAA WP-3D by a chemical ionization mass spectrometry
(CIMS) technique. The highest NH3 mixing ratios were observed in biomass burning and urban outflow plumes and downwind
from major agricultural areas. 5s time resolution measurements enabled the observation of NH3 in these plumes. Biomass
burning plumes were identified using measurements of carbon monoxide (CO) and acetonitrile. The NH3 instrument was
operational for six of the eight flights during which biomass burning plumes were sampled. NH3 enhancements from 1 to 5
ppbv were observed in plumes sampled on four flights: 7/9, 7/20, 7/21, and 7/22. Typically, NH3 was correlated with CO
in these plumes with slopes ranging from 0.007 to 0.015 ppbv/ppbv and r2 ranging from 0.81 to 0.94. However, other
measurements suggest that some layers in these biomass burning plumes had undergone precipitation during transport. In these
layers NH3 showed no enhancement or correlation with CO. The age of these plumes has been estimated at 8 to 10 days.
No NH3 enhancement was observed in the older (~14 days) plume sampled on 7/25. Smaller NH3 enhancements (<
1 ppbv) were observed in the plume sampled on 7/11 that intermingled with outflow from Boston. The New York City urban
outflow plume was identified using measurements of CO and total reactive nitrogen (NOy), and NH3 mixing ratios reached
1.5 ppbv. NH3 was well correlated with CO during the near-source intersects over Long Island on July 20th (r2 =
0.81). However, during the outflow plume intersects in more aged plumes sampled the following day, NH3 mixing ratios
were not correlated with CO and were less than 200 pptv, suggesting that NH3 was lost to particles or by surface
deposition. Immediately downwind of a major agricultural area in Ohio, identified using the EPA 1999 National Emissions
Inventory NH3 gridded emissions and the 2002 USDA census of agriculture, NH3 mixing ratios were enhanced by 1.5
ppbv. 50 km downwind the NH3 mixing ratio was less than 150 pptv. These observations suggest that biomass burning
plumes lofted to the free troposphere can transport significant levels of NH3 multiple days downwind of the source and
that urban and agricultural NH3 sources may have a limited regional effect.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005