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Radiative Transfer in Absorbing Aerosols and Snow Grains: Theory and Experiment

吸收气溶胶和雪粒的辐射传输：理论与实验

基本信息

批准号：
0946315
负责人：
Kuo-Nan Liou
金额：
$ 100万
依托单位：
University of California-Los Angeles
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2010
资助国家：
美国
起止时间：
2010-06-15 至 2016-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0946315&HistoricalAwards=false
关键词：
Radiative Transfer Absorbing Aerosols Snow

项目摘要

This project is an evolution of the Principal Investigator's longstanding research on radiative transfer properties of ice, and turns attention to the absorption and scattering of light as altered by contamination of ice particles and snow grains by black carbon (soot) and dust particles of various sizes, shapes and composition. A combination of laboratory experimentation, numerical simulations and theoretical approaches will be applied to this investigation, which will in-part hinge on a geometric photon tracing method to better determine radiative scattering properties of contaminated ice at both visible and infrared wavelengths. A systematic analysis will be undertaken to improve physical understanding and insight into computationally efficient methodologies deriving snow albedo (i.e. energy reflectance) from a radiative transfer model representing both single and multiple snow layers that include a variety of combinations of snow grain size and shape, black carbon/dust-snow mixtures, and realistic variations of the incident angle of solar radiation.The intellectual merit of this work relates to providing a firm theoretical and model-based foundation for reducing uncertainties in climate system forcing associated with changing atmospheric and snowpack conditions. Broader impacts will derive from improved ability to anticipate rapid changes in snowcover via improved model predictions and associated improvements in water resource management in sensitive areas, including but not limited to glaciated mountains and polar regions, as well as through student education at both graduate and undergraduate levels.

该项目是首席研究人员对冰的辐射传输特性长期研究的发展，并将重点放在不同大小、形状和组成的黑碳(烟灰)和尘埃颗粒污染冰粒和雪粒时对光的吸收和散射。这项研究将结合实验室实验、数值模拟和理论方法进行，这将在一定程度上取决于几何光子追踪方法，以更好地确定污染冰在可见光和红外波长的辐射散射特性。将进行系统的分析，以提高对从代表单雪层和多雪层的辐射传输模型推导雪反照率(即能量反射率)的物理理解和洞察力的方法，该辐射传输模型包括雪粒大小和形状、黑碳/灰尘-雪混合物以及太阳辐射入射角的实际变化的各种组合。这项工作的学术价值涉及到为减少气候系统强迫与大气和积雪条件变化相关的不确定性提供坚实的理论和基于模型的基础。通过改进模型预测和相关改进敏感地区的水资源管理，包括但不限于冰川山脉和极地地区的水资源管理，以及通过研究生和本科生教育，提高预测积雪迅速变化的能力，将产生更广泛的影响。