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| CITIZEN-ENABLED AEROSOL MEASUREMENTS FOR SATELLITES (CEAMS): A NETWORK FOR HIGH-RESOLUTION MEASUREMENTS OF PM2.5 AND AEROSOL OPTICAL DEPTH | |
| 项目编号 | NNX17AF94A S01 |
| JOHN VOLCKENS | |
| 项目主持机构 | COLORADO STATE UNIVERSITY |
| 开始日期 | 2017-02-06 |
| 结束日期 | 2018-03-06 |
| 英文摘要 | Aerosols have contributed large and persistent uncertainties to the quantification of climate change. Their radiative properties depend on a complex combination of characteristics including composition and morphology, size and shape, and mixing state, which models strive to mimic in detail. Yet, in order to calculate their radiative forcing, these details must be represented by three first order optical properties – optical depth τa, single scattering albedo ω0, and asymmetry parameter g – which are observable from different platforms and measurement techniques. While each of these measurement approaches has different limitations, we suggest that the limitations inherent in using a single data source might be partially overcome by considering a range of data sources. Remote sensing is the source that has, by far, the most representative global coverage and hence is most often used in constraining observational and model estimates of aerosol radiative forcing. But large uncertainties in these measurements translate to large uncertainties in radiative forcing estimates. More detailed, in situ observations can be used to evaluate and enhance information retrieved from remote sensing.Through fixed sites that have been in place now for >15 years and increasingly sophisticated mobile deployments and intensive observations periods, ARM has collected geographically representative data from in situ measurements of aerosol optical, physical, and chemical properties alongside remote sensing. A large-scale, integrative effort to bring this content together to bear on more widely used sources of aerosol properties such as the AERONET network and satellite remote sensing has not, as yet, been undertaken. We propose to synthesize (i) data from the ARM program consisting of long-term data sets of standard optical, physical, and chemical properties at fixed sites; (ii) approximately year-long data sets of standard optical properties with associated physical and chemical properties from mobile deployments in key aerosol regimes; and (iii) comprehensive measurements of all aspects of aerosol from the recent Two-Column Aerosol Project (TCAP) campaign. Specifically, we will use a hierarchy of methodologies that include examination of the sensitivity of direct radiative forcing to uncertainties in measured optical properties, synthesis of optical property data sets from a range of sources that compensate for limitations in the individual data sources, and covariance analyses to better understand the processes and conditions that produce the spatio-temporal patterns of radiative forcing. Direct, quantitative comparison of properties from these different measurement perspectives is impossible owing to the different portion of the atmospheric column that these observations represent. Thus, different approaches to cross-referencing these data are required. We present a framework by which available data sources can be integrated and error in the resulting data sets can be quantified. The primary objectiveof this work is to provide greater confidence in the characterization ofaerosol optical properties in different regimes in order to better constrainobservationally-based and modeled aerosol radiative forcing estimates.Understanding how aerosol optical properties and radiative forcing vary, andcovary, in different regions of the globe can improve assumptions required forretrievals and products from satellite-based observations. Understanding howthese radiative quantities covary with chemical composition can help to relatethat information to processes parameterized in models that address the climateimpact of aerosols. |
| 学科分类 | 03 - 天文学;1107 - 航空航天工程;11 - 工程与技术 |
| 资助机构 | US-NASA |
| 国家 | US |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/73615 |
| 推荐引用方式 GB/T 7714 | JOHN VOLCKENS.CITIZEN-ENABLED AEROSOL MEASUREMENTS FOR SATELLITES (CEAMS): A NETWORK FOR HIGH-RESOLUTION MEASUREMENTS OF PM2.5 AND AEROSOL OPTICAL DEPTH.2017. |
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