Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD029387 |
Analysis and Optical Modeling of Individual Heterogeneous Asian Dust Particles Collected at Mauna Loa Observatory | |
Conny, Joseph M.1; Willis, Robert D.2; Ortiz-Montalvo, Diana L.1 | |
2019-03-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:5页码:2702-2723 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We have determined optical properties of heterogeneous particles from aerosol samples collected at Hawaii's Mauna Loa Observatory. Back trajectories, satellite imagery, and composition differences among particles from scanning electron microscopy revealed a subset of particles with dolomite or calcite that likely came from Asia. Using focused ion-beam tomography and the discrete dipole approximation, we show how small amounts of an iron phase (oxide or carbonate), or in one case soot, affected extinction and scattering compared with particles of neat dolomite or calcite. We show how particles exhibit a range scattering values due to varying orientations of the inclusion phases. Extinction efficiencies for the heterogeneous particles with dolomite (3.47) and calcite (3.36) were 19% to 21% lower than extinction for marine background air particles (3.72). Extinction for the Asian dust was, however, generally higher than for the neat particles. Compared to iron carbonate, the presence of an absorbing iron oxide affected scattering in Asian dust particles even at the low oxide concentrations studied here (0.6% to 8.1%). Scattering efficiency decreased by <1% with a 1% increase in hematite but by 2% to 5% with magnetite. Asian dust scattered light strongly forward, but backscattering was 56% larger than for the marine background air particles. Backscattering in the Asian dust was also larger with magnetite than hematite. Single scattering albedo for Asian dust with hematite, magnetite, or soot averaged 0.96 +/- 0.06 (<(x)over bar>+/- s; n = 19) but was as low as 0.72 with a magnetite mass of 5.8%. |
英文关键词 | atmospheric aerosol mineral dust scanning electron microscopy focused ion-beam tomography light scattering discrete dipole approximation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462139800019 |
WOS关键词 | NORTH PACIFIC-OCEAN ; MINERAL DUST ; IRON-OXIDES ; RADIATIVE PROPERTIES ; TRANSPORT ; AEROSOL ; CHINA ; DESERT ; EVENTS ; JAPAN |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/181683 |
专题 | 气候变化 |
作者单位 | 1.NIST, Mat Measurement Sci Div, Gaithersburg, MD 20899 USA; 2.US EPA, Off Res & Dev, Res Triangle Pk, NC 27711 USA |
推荐引用方式 GB/T 7714 | Conny, Joseph M.,Willis, Robert D.,Ortiz-Montalvo, Diana L.. Analysis and Optical Modeling of Individual Heterogeneous Asian Dust Particles Collected at Mauna Loa Observatory[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(5):2702-2723. |
APA | Conny, Joseph M.,Willis, Robert D.,&Ortiz-Montalvo, Diana L..(2019).Analysis and Optical Modeling of Individual Heterogeneous Asian Dust Particles Collected at Mauna Loa Observatory.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(5),2702-2723. |
MLA | Conny, Joseph M.,et al."Analysis and Optical Modeling of Individual Heterogeneous Asian Dust Particles Collected at Mauna Loa Observatory".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.5(2019):2702-2723. |
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