Impacts of the Denver Cyclone on regional air quality and aerosol formation in the Colorado Front Range during FRAPPE 2014

被引：24

作者：

Vu, Kennedy T. ^{[1
]}

Dingle, Justin H. ^{[1
]}

Bahreini, Roya ^{[1
,2
]}

Reddy, Patrick J. ^{[3
,10
]}

Apel, Eric C. ^{[3
]}

Campos, Teresa L. ^{[3
]}

DiGangi, Joshua P. ^{[4
]}

Diskin, Glenn S. ^{[4
]}

Fried, Alan ^{[5
]}

Herndon, Scott C. ^{[6
]}

Hills, Alan J. ^{[3
]}

Hornbrook, Rebecca S. ^{[3
]}

Huey, Greg ^{[7
]}

Kaser, Lisa ^{[3
]}

Montzka, Denise D. ^{[3
]}

Nowak, John B. ^{[6
]}

Pusede, Sally E. ^{[8
]}

Richter, Dirk ^{[5
]}

Roscioli, Joseph R. ^{[6
]}

Sachse, Glen W. ^{[9
]}

Shertz, Stephen ^{[3
]}

Stell, Meghan ^{[3
]}

Tanner, David ^{[7
]}

Tyndall, Geoffrey S. ^{[3
]}

Walega, James ^{[5
]}

Weibring, Peter ^{[5
]}

Weinheimer, Andrew J. ^{[3
]}

Pfister, Gabriele ^{[3
]}

Flocke, Frank ^{[3
]}

机构：

[1] Univ Calif Riverside, Environm Toxicol Grad Program, Riverside, CA 92521 USA

[2] Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA

[3] Natl Ctr Atmospher Res, Atmospher Chem Observat & Modeling Lab, Boulder, CO 80301 USA

[4] NASA Langley Res Ctr, Chem & Dynam Branch, Hampton, VA 23681 USA

[5] Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80303 USA

[6] Aerodyne Res Inc, Billerica, MA 01821 USA

[7] Georgia Inst Technol, Dept Earth & Atmospher Sci, Atlanta, GA 30033 USA

[8] Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA

[9] Natl Inst Aerosp, Hampton, VA 23666 USA

[10] NCAR, Boulder, CO 80301 USA

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2016年 / 16卷 / 18期

基金：

美国食品与农业研究所;

关键词：

SECONDARY ORGANIC AEROSOL; IONIZATION MASS-SPECTROMETRY; GENERATING PARTICLE BEAMS; NATURAL-GAS OPERATIONS; NITROGEN DEPOSITION; BROWN CLOUD; CONTROLLED DIMENSIONS; AERODYNAMIC LENSES; POLLUTION; FLUORESCENCE;

D O I：

10.5194/acp-16-12039-2016

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We present airborne measurements made during the 2014 Front Range Air Pollution and Photochemistry Experiment (FRAPPE) project to investigate the impacts of the Denver Cyclone on regional air quality in the greater Denver area. Data on trace gases, non-refractory submicron aerosol chemical constituents, and aerosol optical extinction (beta(ext)) at lambda = 632 nm were evaluated in the presence and absence of the surface mesoscale circulation in three distinct study regions of the Front Range: In-Flow, Northern Front Range, and the Denver metropolitan area. Pronounced increases in mass concentrations of organics, nitrate, and sulfate in the Northern Front Range and the Denver metropolitan area were observed during the cyclone episodes (27-28 July) compared to the non-cyclonic days (26 July, 2-3 August). Organic aerosols dominated the mass concentrations on all evaluated days, with a 45% increase in organics on cyclone days across all three regions, while the increase during the cyclone episode was up to similar to 80% over the Denver metropolitan area. In the most aged air masses (NOx/NOy < 0.5), back-ground organic aerosols over the Denver metropolitan area increased by a factor of similar to 2.5 due to transport from Northern Front Range. Furthermore, enhanced partitioning of nitric acid to the aerosol phase was observed during the cyclone episodes, mainly due to increased abundance of gas phase ammonia. During the non-cyclone events, beta(ext) displayed strong correlations (r = 0.71) with organic and nitrate in the Northern Front Range and only with organics (r = 0.70) in the Denver metropolitan area, while correlation of beta(ext) during the cyclone was strongest (r = 0.86) with nitrate over Denver. Mass extinction efficiency (MEE) values in the Denver metropolitan area were similar on cyclone and non-cyclone days despite the dominant influence of different aerosol species on beta(ext). Our analysis showed that the meteorological patterns associated with the Denver Cyclone increased aerosol mass loadings in the Denver metropolitan area mainly by transporting aerosols and/or aerosol precursors from the northern regions, leading to impaired visibility and air quality deterioration.

引用

页码：12039 / 12058

页数：20

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