In Situ Chemical Characterization of Aged Biomass-Burning Aerosols Impacting Cold Wave Clouds

被引:47
|
作者
Pratt, Kerri A. [1 ]
Heymsfield, Andrew J. [2 ]
Twohy, Cynthia H. [3 ]
Murphy, Shane M. [4 ,5 ]
DeMott, Paul J. [6 ]
Hudson, James G. [7 ]
Subramanian, R. [8 ]
Wang, Zhien [9 ]
Seinfeld, John H. [4 ]
Prather, Kimberly A. [1 ,10 ]
机构
[1] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA
[2] Natl Ctr Atmospher Res, Boulder, CO 80307 USA
[3] Oregon State Univ, Dept Ocean & Atmospher Sci, Corvallis, OR 97331 USA
[4] CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA
[5] NOAA, Div Chem Sci, Earth Syst Res Lab, Boulder, CO USA
[6] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA
[7] Univ Nevada, Desert Res Inst, Div Atmospher Sci, Reno, NV 89506 USA
[8] Droplet Measurement Technol, Boulder, CO USA
[9] Univ Wyoming, Dept Atmospher Sci, Laramie, WY 82071 USA
[10] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
关键词
HOMOGENEOUS ICE NUCLEATION; MASS-SPECTROMETER; SOUTHERN AFRICA; ATMOSPHERIC AEROSOLS; CONDENSATION NUCLEI; ORGANIC AEROSOLS; SIZE DISTRIBUTIONS; OPTICAL-PROPERTIES; SOOT AEROSOLS; CIRRUS CLOUDS;
D O I
10.1175/2010JAS3330.1
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
During the Ice in Clouds Experiment Layer Clouds (ICE-L), aged biomass-burning particles were identified within two orographic wave cloud regions over Wyoming using single-particle mass spectrometry and electron microscopy. Using a suite of instrumentation, particle chemistry was characterized in tandem with cloud microphysics. The aged biomass-burning particles comprised similar to 30%-40% by number of the 0.1-1.0-mu m clear-air particles and were composed of potassium, organic carbon, elemental carbon, and sulfate. Aerosol mass spectrometry measurements suggested these cloud-processed particles were predominantly sulfate by mass. The first cloud region sampled was characterized by primarily homogeneously nucleated ice particles formed at temperatures near -40 degrees C. The second cloud period was characterized by high cloud droplet concentrations (similar to 150-300 cm(-3)) and lower heterogeneously nucleated ice concentrations (7-18 L-1) at cloud temperatures of -24 degrees to -25 degrees C. As expected for the observed particle chemistry and dynamics of the observed wave clouds, few significant differences were observed between the clear-air particles and cloud residues. However, suggestive of a possible heterogeneous nucleation mechanism within the first cloud region, ice residues showed enrichments in the number fractions of soot and mass fractions of black carbon, measured by a single-particle mass spectrometer and a single-particle soot photometer, respectively. In addition, enrichment of biomass-burning particles internally mixed with oxalic acid in both the homogeneously nucleated ice and cloud droplets compared to clear air suggests either preferential activation as cloud condensation nuclei or aqueous phase cloud processing.
引用
收藏
页码:2451 / 2468
页数:18
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