Study Dust Optical and Radiative Properties Using Optimal Morphological Sets

使用最佳形态集研究灰尘光学和辐射特性

• 批准号: 0803779
• 负责人: Ping Yang
• 金额: $ 41.99万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-01 至 2012-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0803779&HistoricalAwards=false
• 关键词: Study; Dust; Optical; Radiative; Properties

Airborne dust and smaller aerosol particles play an important role in the earth's climate system by scattering light and longer wavelength (e.g., thermal) radiation passing through the atmosphere. To the extent that their impacts are imperfectly known, they also complicate interpretation of TOA (top of atmosphere) emissions of thermal energy and scattered/reflected light as remotely sensed by satellites. Both aspects are of crucial importance in our efforts to obtain a physically representative, quantitatively accurate understanding of global circulation dynamics and any overlain signals corresponding to climate change. The fact that dusts and aerosols exhibit a myriad of differing sizes, shapes and compositions greatly complicates this problem. The primary objective of this research effort is to explore the feasibility of reducing this complexity via definition and development a more manageable number of "optimal morphological parameters" associated with representative particle types. This project will develop and validate mathematically sophisticated methods for estimating both radiative and light-scattering properties of such particles that are far more efficient in their use of computer time than currently available methods. Once fully tested and documented, associated computer codes will be made widely available to the broader research community for further use and evaluation.The intellectual merit of this effort is centered on improving our knowledge of the optical and radiative properties of airborne dust and aerosols. The resultant findings will have direct applications in the study of the Earth's radiative budget as well as remote sensing of atmospheric properties from both ground-based and orbital platforms. Broader impacts of this research will include increased ability to accurately specify the "direct radiative forcing" (e.g., induced warming and/or cooling) associated with both natural and anthropogenically-generated aerosols on our climate via sophisticated global-scale computer models. This project will also support the education and training of several graduate students in the interdiscplinary area marked by the intersection of atmospheric physics and classical electromagnetics.

空气中的灰尘和较小的气溶胶颗粒通过散射光线和更长的波长（例如，热）辐射在地球的气候系统中起着重要作用。在一定程度上，它们的影响是不完美的，它们还使对TOA的解释（大气顶）对热能的排放和散射/反射光的排放复杂化，因为卫星远程感受到了。这两个方面对于我们努力获得具有物理代表性的，定量准确地了解全球循环动力学和与气候变化相对应的任何覆盖信号的努力至关重要。灰尘和气溶胶表现出无数不同大小，形状和成分的事实极大地使这个问题变得复杂。这项研究工作的主要目的是探索通过定义和开发降低这种复杂性的可行性，与代表性粒子类型相关的更可管理数量的“最佳形态参数”。该项目将开发和验证数学上复杂的方法，以估算此类粒子的辐射和光散射特性，这些粒子在使用计算机时间的使用效率比当前可用的方法更有效。一旦进行了充分的测试和记录，将向更广泛的研究社区广泛使用相关的计算机代码，以进一步使用和评估。这项工作的智力优点集中在我们对空气中灰尘和气溶胶的光学和辐射特性的了解。随之而来的发现将在研究地球辐射预算以及对地面和轨道平台的大气特性的遥感研究中直接应用。这项研究的更广泛的影响将包括提高能够准确指定与天然和人为生成的气溶胶相关的“直接辐射强迫”（例如，诱导的变暖和/或冷却）通过复杂的全球尺度计算机模型在我们的气候上与天然和人为生成的气溶胶相关。该项目还将支持以大气物理学和经典电磁学交集为标志的互化领域的几位研究生的教育和培训。