Investigation of the sources and processing of organic aerosol over the Central Mexican Plateau from aircraft measurements during MILAGRO

被引：250

作者：

DeCarlo, P. F. ^{[1
,2
]}

Ulbrich, I. M. ^{[1
,3
]}

Crounse, J. ^{[4
]}

de Foy, B. ^{[5
]}

Dunlea, E. J. ^{[1
]}

Aiken, A. C. ^{[1
,3
]}

Knapp, D. ^{[6
]}

Weinheimer, A. J. ^{[6
]}

Campos, T. ^{[6
]}

Wennberg, P. O. ^{[4
]}

Jimenez, J. L. ^{[1
,3
]}

机构：

[1] Univ Colorado, CIRES, Boulder, CO 80309 USA

[2] Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA

[3] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA

[4] CALTECH, Pasadena, CA 91125 USA

[5] St Louis Univ, Dept Earth & Atmospher Sci, St Louis, MO 63103 USA

[6] Natl Ctr Atmospher Res, Boulder, CO 80307 USA

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2010年 / 10卷 / 12期

基金：

美国国家科学基金会;

关键词：

PARTICLE NUMBER-DISTRIBUTION; HIGH-RESOLUTION; SOURCE APPORTIONMENT; MASS-SPECTROMETRY; NORTH-AMERICA; AIR-QUALITY; CITY; EMISSIONS; AMBIENT; SECONDARY;

D O I：

10.5194/acp-10-5257-2010

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Organic aerosol (OA) represents approximately half of the submicron aerosol in Mexico City and the Central Mexican Plateau. This study uses the high time resolution measurements performed onboard the NCAR/NSF C-130 aircraft during the MILAGRO/MIRAGE-Mex field campaign in March 2006 to investigate the sources and chemical processing of the OA in this region. An examination of the OA/Delta CO ratio evolution as a function of photochemical age shows distinct behavior in the presence or absence of substantial open biomass burning (BB) influence, with the latter being consistent with other studies in polluted areas. In addition, we present results from Positive Matrix Factorization (PMF) analysis of 12-s High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS) OA spectra. Four components were resolved. Three of the components contain substantial organic oxygen and are termed semivolatile oxygenated OA (SV-OOA), low-volatility OOA (LV-OOA), and biomass burning OA (BBOA). A reduced "hydrocarbon-like OA" (HOA) component is also resolved. LV-OOA is highly oxygenated (atomic O/C similar to 1) and is aged organic aerosol linked to regional airmasses, with likely contributions from pollution, biomass burning, and other sources. SV-OOA is strongly correlated with ammonium nitrate, O-x, and the Mexico City Basin. We interpret SV-OOA as secondary OA which is nearly all (> 90%) anthropogenic in origin. In the absence of biomass burning it represents the largest fraction of OA over the Mexico City basin, consistent with other studies in this region. BBOA is identified as arising from biomass burning sources due to a strong correlation with HCN, and the elevated contribution of the ion C2H4O2+ 2 (m/z 60, a marker for levoglucosan and other primary BB species). WRF-FLEXPART calculated fire impact factors (FIF) show good correlation with BBOA mass concentrations within the basin, but show location offsets in the far field due to model transport errors. This component is small or absent when forest fires are suppressed by precipitation. Since PMF factors represent organic species grouped by chemical similarity, additional postprocessing is needed to more directly apportion OA amounts to sources, which is done here based on correlations to different tracers. The post-processed AMS results are similar to those from an independent source apportionment based on multiple linear regression with gas-phase tracers. During a flight with very high forest fire intensity near the basin OA arising from open BB represents similar to 66% of the OA mass in the basin and contributes similarly to OA mass in the outflow. Aging and SOA formation of BB emissions is estimated to add OA mass equivalent to about similar to 32-42% of the primary BBOA over several hours to a day.

引用

页码：5257 / 5280

页数：24

共 79 条

[11] Biomass burning and urban air pollution over the Central Mexican Plateau [J].

Crounse, J. D. ;

DeCarlo, P. F. ;

Blake, D. R. ;

Emmons, L. K. ;

Campos, T. L. ;

Apel, E. C. ;

Clarke, A. D. ;

Weinheimer, A. J. ;

McCabe, D. C. ;

Yokelson, R. J. ;

Jimenez, J. L. ;

Wennberg, P. O. .

ATMOSPHERIC CHEMISTRY AND PHYSICS, 2009, 9 (14) :4929-4944

[12] Basin-scale wind transport during the MILAGRO field campaign and comparison to climatology using cluster analysis [J].

de Foy, B. ;

Fast, J. D. ;

Paech, S. J. ;

Phillips, D. ;

Walters, J. T. ;

Coulter, R. L. ;

Martin, T. J. ;

Pekour, M. S. ;

Shaw, W. J. ;

Kastendeuch, P. P. ;

Marley, N. A. ;

Retama, A. ;

Molina, L. T. .

ATMOSPHERIC CHEMISTRY AND PHYSICS, 2008, 8 (05) :1209-1224

[13] Hit from both sides: tracking industrial and volcanic plumes in Mexico City with surface measurements and OMI SO2 retrievals during the MILAGRO field campaign [J].

de Foy, B. ;

Krotkov, N. A. ;

Bei, N. ;

Herndon, S. C. ;

Huey, L. G. ;

Martinez, A. -P. ;

Ruiz-Suarez, L. G. ;

Wood, E. C. ;

Zavala, M. ;

Molina, L. T. .

ATMOSPHERIC CHEMISTRY AND PHYSICS, 2009, 9 (24) :9599-9617

[14] Evaluation of WRF mesoscale simulations and particle trajectory analysis for the MILAGRO field campaign [J].

de Foy, B. ;

Zavala, M. ;

Bei, N. ;

Molina, L. T. .

ATMOSPHERIC CHEMISTRY AND PHYSICS, 2009, 9 (13) :4419-4438

[15] Emission and chemistry of organic carbon in the gas and aerosol phase at a sub-urban site near Mexico City in March 2006 during the MILAGRO study [J].

de Gouw, J. A. ;

Welsh-Bon, D. ;

Warneke, C. ;

Kuster, W. C. ;

Alexander, L. ;

Baker, A. K. ;

Beyersdorf, A. J. ;

Blake, D. R. ;

Canagaratna, M. ;

Celada, A. T. ;

Huey, L. G. ;

Junkermann, W. ;

Onasch, T. B. ;

Salcido, A. ;

Sjostedt, S. J. ;

Sullivan, A. P. ;

Tanner, D. J. ;

Vargas, O. ;

Weber, R. J. ;

Worsnop, D. R. ;

Yu, X. Y. ;

Zaveri, R. .

ATMOSPHERIC CHEMISTRY AND PHYSICS, 2009, 9 (10) :3425-3442

[16] Sources of particulate matter in the northeastern United States in summer: 1. Direct emissions and secondary formation of organic matter in urban plumes [J].

de Gouw, J. A. ;

Brock, C. A. ;

Atlas, E. L. ;

Bates, T. S. ;

Fehsenfeld, F. C. ;

Goldan, P. D. ;

Holloway, J. S. ;

Kuster, W. C. ;

Lerner, B. M. ;

Matthew, B. M. ;

Middlebrook, A. M. ;

Onasch, T. B. ;

Peltier, R. E. ;

Quinn, P. K. ;

Senff, C. J. ;

Stohl, A. ;

Sullivan, A. P. ;

Trainer, M. ;

Warneke, C. ;

Weber, R. J. ;

Williams, E. J. .

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2008, 113 (D8)

[17] Budget of organic carbon in a polluted atmosphere: Results from the New England Air Quality Study in 2002 [J].

de Gouw, JA ;

Middlebrook, AM ;

Warneke, C ;

Goldan, PD ;

Kuster, WC ;

Roberts, JM ;

Fehsenfeld, FC ;

Worsnop, DR ;

Canagaratna, MR ;

Pszenny, AAP ;

Keene, WC ;

Marchewka, M ;

Bertman, SB ;

Bates, TS .

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2005, 110 (D16) :1-22

[18] Organic Aerosols in the Earth's Atmosphere [J].

De Gouw, Joost ;

Jimenez, Jose L. .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2009, 43 (20) :7614-7618

[19] Fast airborne aerosol size and chemistry measurements above Mexico City and Central Mexico during the MILAGRO campaign [J].

DeCarlo, P. F. ;

Dunlea, E. J. ;

Kimmel, J. R. ;

Aiken, A. C. ;

Sueper, D. ;

Crounse, J. ;

Wennberg, P. O. ;

Emmons, L. ;

Shinozuka, Y. ;

Clarke, A. ;

Zhou, J. ;

Tomlinson, J. ;

Collins, D. R. ;

Knapp, D. ;

Weinheimer, A. J. ;

Montzka, D. D. ;

Campos, T. ;

Jimenez, J. L. .

ATMOSPHERIC CHEMISTRY AND PHYSICS, 2008, 8 (14) :4027-4048

[20] Field-deployable, high-resolution, time-of-flight aerosol mass spectrometer [J].

DeCarlo, Peter F. ;

Kimmel, Joel R. ;

Trimborn, Achim ;

Northway, Megan J. ;

Jayne, John T. ;

Aiken, Allison C. ;

Gonin, Marc ;

Fuhrer, Katrin ;

Horvath, Thomas ;

Docherty, Kenneth S. ;

Worsnop, Doug R. ;

Jimenez, Jose L. .

ANALYTICAL CHEMISTRY, 2006, 78 (24) :8281-8289

← 1 2 3 4 5 6 7 8 →