CAREER: Investigation of the Scattering and Radiative Properties of Ice and Mixed-Phase Clouds

职业：研究冰和混合相云的散射和辐射特性

• 批准号: 0239605
• 负责人: Ping Yang
• 金额: $ 62.34万
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-05-01 至 2009-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0239605&HistoricalAwards=false
• 关键词: CAREER; Investigation; Scattering; Radiative; Properties

The goal of this project is to improve the treatment of ice and mixed-phase clouds in remote sensing applications and in the parameterization of clouds for climate and general circulation models. The research consists of five broad components. Principal of these is a fundamental investigation of light scattering by nonspherical ice particles, including crystals of regular and irregular shapes characteristic of cirrus clouds and clouds composed of a mix of ice crystals and supercooled water droplets. This work centers on improving the accuracy and efficiency of scattering computations by using a combination of the finite-difference time domain (FTDT) method, T-matrix methods, and the improved geometric optics method (IGOM). The objective is to generate a data base for absorption and scattering properties of various ice crystal forms at solar and infrared wavelengths. The other research components include (1) integration of the scattering results for individual particles with information of the composition of cirrus clouds to determine the radiative properties of the clouds for the purposes of satellite remote sensing; (2) parameterization of the bulk radiative properties of cirrus and mixed-phase clouds for application to large-scale atmospheric models; (3) development of retrieval algorithms for inferring cloud microphysical and optical properties from multispectral satellite measurements; (4) integration of the light scattering programs, radiative transfer schemes, and retrieval algorithms in a convenient computational package for the remote sensing and climate modeling communities. Along with graduate and undergraduate student supervision, the educational component of the project comprises developing a curriculum that integrates radiative transfer, cloud physics, and atmospheric remote sensing, and ultimately establishing a Laboratory for Radiative Transfer and Remote Sensing, including web-based instructional material.

该项目的目标是改进遥感应用以及气候和大气环流模型云参数化中对冰和混合相云的处理。 该研究由五个主要部分组成。 其中的主要内容是对非球形冰颗粒光散射的基础研究，包括卷云和由冰晶和过冷水滴混合组成的云的规则和不规则形状特征的晶体。 这项工作的重点是通过结合使用时域有限差分（FTDT）方法、T矩阵方法和改进的几何光学方法（IGOM）来提高散射计算的精度和效率。 目标是生成一个数据库，用于了解各种冰晶形式在太阳和红外波长下的吸收和散射特性。 其他研究内容包括（1）将单个粒子的散射结果与卷云的组成信息相结合，以确定云的辐射特性，以用于卫星遥感的目的； (2) 卷云和混合相云的整体辐射特性参数化，以应用于大规模大气模型； (3) 开发从多光谱卫星测量推断云微物理和光学特性的反演算法； (4) 将光散射程序、辐射传输方案和检索算法集成到一个方便的计算包中，供遥感和气候建模界使用。 除了研究生和本科生的监督外，该项目的教育部分还包括开发集成辐射传输、云物理和大气遥感的课程，并最终建立辐射传输和遥感实验室，包括基于网络的教学材料。