Brown carbon spheres in East Asian outflow and their optical properties

被引：392

作者：

Alexander, Duncan T. L. ^{[2
]}

Crozier, Peter A. ^{[1
]}

Anderson, James R. ^{[3
]}

机构：

[1] Arizona State Univ, Sch Mat, Tempe, AZ 85287 USA

[2] Arizona State Univ, LeRoy Eyring Ctr Solid State Sci, Tempe, AZ 85287 USA

[3] Arizona State Univ, Dept Mech & Aerosp Engn, Tempe, AZ 85287 USA

来源：

SCIENCE | 2008年 / 321卷 / 5890期

关键词：

D O I：

10.1126/science.1155296

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Atmospheric aerosols play a substantial role in climate change through radiative forcing. Combustion-produced carbonaceous particles are the main light-absorbing aerosols; thus, quantifying their optical properties is essential for determining the magnitude of direct forcing. By using the electron energy-loss spectrum in the transmission electron microscope, we quantified the optical properties of individual, submicrometer amorphous carbon spheres that are ubiquitous in East Asian-Pacific outflow. The data indicate that these common spheres are brown, not black, with a mean refractive index of 1.67 - 0.27i (where i = root 1) at a wavelength of 550 nanometers. The results suggest that brown carbon aerosols should be explicitly included in radiative forcing models.

引用

页码：833 / 836

页数：4

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