Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019JD031480 |
Implications of Organic Mass to Carbon Ratios Increasing Over Time in the Rural United States | |
Malm, W. C.1; Schichtel, B. A.2; Hand, J. L.1; Prenni, A. J.2 | |
2020-03-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2020 |
卷号 | 125期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The thermal evolution procedure used by most monitoring programs in the United States to determine carbonaceous aerosol concentrations is referred to as the thermal-optical reflectance method, where an aerosol sample that has been collected on a quartz filter is heated and evolved carbon is characterized as either organic (OC) or light absorbing carbon (LAC). Evolved carbon assigned to OC is multiplied by a factor, R-oc, to achieve an estimate of organic mass. Over the last 10-15 years, R-oc, estimated through multiple linear regression analysis of data collected in the Interagency Monitoring of Protected Visual Environments (IMPROVE) program, has increased at about a rate of about 0.02 per year, reaching values above 2.0 in many regions of the United States. Analysis of evolved carbon concentration temporal trends suggests that thermal-optical reflectance analysis, on the average, inaccurately bifurcates particulate carbon into the OC and LAC fractions with some LAC being inadvertently and wrongly assigned to the OC fraction. It is shown that misapportioned LAC assigned to OC is decreasing faster than true OC, resulting in a compensating increase in the R-oc assigned to reported OC over time. A first-order model is proposed to correct for the misapportioned carbon. |
英文关键词 | Thermal Optical Reflectance Organic Carbon Elemental Carbon Organic Carbon to Carbon Ratio Carbon Measurement Uncertainty |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000519602000019 |
WOS关键词 | BLACK CARBON ; AEROSOL MASS ; LIGHT-ABSORPTION ; PARTICULATE MATTER ; ELEMENTAL CARBON ; OM/OC RATIOS ; IMPROVE ; PM2.5 ; SPECIATION ; PARTICLES |
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/280110 |
专题 | 气候变化 |
作者单位 | 1.Colorado State Univ, Cooperat Inst Res Atmosphere, Ft Collins, CO 80523 USA; 2.Natl Pk Serv, Air Resources Div, Lakewood, CO USA |
推荐引用方式 GB/T 7714 | Malm, W. C.,Schichtel, B. A.,Hand, J. L.,et al. Implications of Organic Mass to Carbon Ratios Increasing Over Time in the Rural United States[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2020,125(5). |
APA | Malm, W. C.,Schichtel, B. A.,Hand, J. L.,&Prenni, A. J..(2020).Implications of Organic Mass to Carbon Ratios Increasing Over Time in the Rural United States.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,125(5). |
MLA | Malm, W. C.,et al."Implications of Organic Mass to Carbon Ratios Increasing Over Time in the Rural United States".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 125.5(2020). |
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