Ammonia sources in the California South Coast Air Basin and their impact on ammonium nitrate formation

被引：103
作者：
Nowak, J. B. [1 ,2 ]
Neuman, J. A. [1 ,2 ]
Bahreini, R. [1 ,2 ]
Middlebrook, A. M. [2 ]
Holloway, J. S. [1 ,2 ]
McKeen, S. A. [1 ,2 ]
Parrish, D. D. [2 ]
Ryerson, T. B. [2 ]
Trainer, M. [2 ]
机构：
[1] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80305 USA
[2] NOAA, Div Chem Sci, Earth Syst Res Lab, Boulder, CO 80305 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2012年 / 39卷
关键词：
DISSOCIATION-CONSTANT; EMISSIONS; QUALITY; OZONE; TEXAS; MODEL; NOX;
D O I：
10.1029/2012GL051197
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Observations from the NOAA WP-3D aircraft during CalNex in May and June 2010 are used to quantify ammonia (NH3) emissions from automobiles and dairy facilities in the California South Coast Air Basin (SoCAB) and assess their impact on particulate ammonium nitrate (NH4NO3) formation. These airborne measurements in the SoCAB are used to estimate automobile NH3 emissions, 62 +/- 24 metric tons day(-1), and dairy facility NH3 emissions, 33 +/- 16 to 176 +/- 88 metric tons day-1. Emission inventories agree with the observed automobile NH3: CO emission ratio, but substantially under-predict dairy facility NH3 emissions. Conditions observed downwind of the dairy facilities were always thermodynamically favorable for NH4NO3 formation due to high NH3 mixing ratios from the concentrated sources. Although automobile emissions generated lower NH3 mixing ratios, they also can thermodynamically favor NH4NO3 formation. As an aerosol control strategy, addressing the dairy NH3 source would have the larger impact on reducing SoCAB NH4NO3 formation. Citation: Nowak, J. B., J. A. Neuman, R. Bahreini, A. M. Middlebrook, J. S. Holloway, S. A. McKeen, D. D. Parrish, T. B. Ryerson, and M. Trainer (2012), Ammonia sources in the California South Coast Air Basin and their impact on ammonium nitrate formation, Geophys. Res. Lett., 39, L07804, doi: 10.1029/2012GL051197.
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页数：6
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