Aerosol optical properties in the southeastern United States in summer - Part 1: Hygroscopic growth

被引：87

作者：

Brock, Charles A. ^{[1
]}

Wagner, Nicholas L. ^{[1
,2
]}

Anderson, Bruce E. ^{[3
]}

Attwood, Alexis R. ^{[1
,2
,8
]}

Beyersdorf, Andreas ^{[3
]}

Campuzano-Jost, Pedro ^{[2
,4
]}

Carlton, Annmarie G. ^{[5
]}

Day, Douglas A. ^{[2
,4
]}

Diskin, Glenn S. ^{[3
]}

Gordon, Timothy D. ^{[1
,2
,9
]}

Jimenez, Jose L. ^{[2
,4
]}

Lack, Daniel A. ^{[1
,2
,10
]}

Liao, Jin ^{[1
,2
,11
]}

Markovic, Milos Z. ^{[1
,2
,12
]}

Middlebrook, Ann M. ^{[1
]}

Ng, Nga L. ^{[6
,7
]}

Perring, Anne E. ^{[1
,2
]}

Richardson, Matthews S. ^{[1
,2
]}

Schwarz, Joshua P. ^{[1
]}

Washenfelder, Rebecca A. ^{[1
,2
]}

Welti, Andre ^{[1
,2
,13
]}

Xu, Lu ^{[7
]}

Ziemba, Luke D. ^{[3
]}

Murphy, Daniel M. ^{[1
]}

机构：

[1] NOAA, Earth Syst Res Lab, Boulder, CO USA

[2] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

[3] NASA, Langley Res Ctr, Hampton, VA 23665 USA

[4] Univ Colorado, Dept Chem & Biochem, Campus Box 215, Boulder, CO 80309 USA

[5] Rutgers State Univ, Dept Environm Sci, New Brunswick, NJ 08903 USA

[6] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

[7] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

[8] Droplet Measurement Technol, Boulder, CO USA

[9] Handix Sci, Boulder, CO USA

[10] TEAC Consulting, Brisbane, Qld, Australia

[11] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[12] Environm Canada, Air Qual Res Div, Toronto, ON, Canada

[13] Leibniz Inst Tropospher Res, Dept Phys, Leipzig, Germany

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2016年 / 16卷 / 08期

基金：

美国国家科学基金会;

关键词：

SECONDARY ORGANIC AEROSOL; RELATIVE-HUMIDITY; LIGHT-SCATTERING; IN-SITU; SATELLITE-OBSERVATIONS; LIDAR MEASUREMENTS; ATMOSPHERIC AEROSOLS; SEASONAL-VARIATION; SIZE DISTRIBUTION; HIGH-RESOLUTION;

D O I：

10.5194/acp-16-4987-2016

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Aircraft observations of meteorological, trace gas, and aerosol properties were made during May-September 2013 in the southeastern United States (US) under fair-weather, afternoon conditions with well-defined planetary boundary layer structure. Optical extinction at 532aEuro-nm was directly measured at relative humidities (RHs) of aEuro-15, aEuro-70, and aEuro-90aEuro-% and compared with extinction calculated from measurements of aerosol composition and size distribution using the kappa-Kohler approximation for hygroscopic growth. The calculated enhancement in hydrated aerosol extinction with relative humidity, f(RH), calculated by this method agreed well with the observed f(RH) at aEuro-90aEuro-% RH. The dominance of organic aerosol, which comprised 65aEuro-+/- aEuro-10aEuro-% of particulate matter with aerodynamic diameter < aEuro-1aEuro-A mu m in the planetary boundary layer, resulted in relatively low f(RH) values of 1.43aEuro-+/- aEuro-0.67 at 70aEuro-% RH and 2.28aEuro-+/- aEuro-1.05 at 90aEuro-% RH. The subsaturated kappa-Kohler hygroscopicity parameter kappa for the organic fraction of the aerosol must have been < aEuro-0.10 to be consistent with 75aEuro-% of the observations within uncertainties, with a best estimate of kappa aEuro- = aEuro-0.05. This subsaturated kappa value for the organic aerosol in the southeastern US is broadly consistent with field studies in rural environments. A new, physically based, single-parameter representation was developed that better described f(RH) than did the widely used gamma power-law approximation.

引用

页码：4987 / 5007

页数：21

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