Understanding the Influences of Microphysical Interactions with Pollution and Water on Dust Scattering Properties and Radiative Effects

了解污染物和水的微物理相互作用对粉尘散射特性和辐射效应的影响

• 批准号: 2232138
• 负责人: Zhibo Zhang
• 金额: $ 61.37万
• 依托单位: University of Maryland Baltimore County
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-01-01 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2232138&HistoricalAwards=false
• 关键词: Understanding; Influences; Microphysical; Interactions; Pollution

Mineral dust is an integral component of the Earth system that influences weather and climate via a suite of complex interactions with the energy, water, and carbon cycles. Once aloft, dust can be carried by winds for intercontinental or even hemispherical transport. During long-range transport, the dust particles can become mixed with pollutants such as ammonium sulphate, ammonium nitrate, hydrochloric acid, and biomass burning particles, leading to changes of dust composition and hygroscopicity which in turn influence how dust interacts with water. In the past, many studies have investigated how pure, unpolluted dust aerosols interact with radiations, such as sunlight, infrared radiation and lidar signals. However, the scattering behaviors of polluted dust and hydrated dust are still poorly understood, which undermines our understanding of the role of dust in the climate system, as well as our capability to detect and retrieve dust aerosols using advanced remote sensing techniques. This project is to study how microphysical interactions with pollutants and water influence the scattering properties of dust aerosols and assess the implications for dust radiative effects and dust remote sensing. This goal is achieved through major tasks: First, the scattering properties of dust particles in different mixing states, including pure dust, coated dust and dust-aerosol coagulation, at different sizes and for different wavelengths will be computed using advanced scattering models; Second, the scattering properties of internally mixed dust particles will be compared with those of pure dust; Third, radiative transfer models will be used to simulate and compare the radiative effects of dust in different mixing states to understand the impacts of dust-pollution-water interactions on the climate system. The project involves mentoring two graduate students to be the next generation of atmospheric physicists.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

矿物粉尘是地球系统的组成部分，通过与能量、水和碳循环的一系列复杂相互作用影响天气和气候。一旦飞到高空，尘埃就可以被风带到洲际甚至半球运输。在远距离传输过程中，尘埃颗粒可能与硫酸铵、硝酸铵、盐酸和生物质燃烧颗粒等污染物混合，导致尘埃成分和吸湿性的变化，从而影响尘埃与水的相互作用。在过去，许多研究已经调查了纯净的，未污染的尘埃气溶胶如何与辐射相互作用，如阳光，红外辐射和激光雷达信号。然而，污染尘埃和水合尘埃的散射行为仍然知之甚少，这削弱了我们对尘埃在气候系统中的作用的理解，以及我们使用先进的遥感技术检测和检索尘埃气溶胶的能力。 该项目旨在研究微物理与污染物和水的相互作用如何影响尘埃气溶胶的散射特性，并评估尘埃辐射效应和尘埃遥感的影响。本文的主要工作是：首先，利用先进的散射模型计算了不同混合状态下的尘埃粒子的散射特性，包括纯尘埃、有涂层尘埃和尘埃-气溶胶凝聚，以及不同尺寸和不同波长下的散射特性;其次，将内部混合尘埃粒子的散射特性与纯尘埃粒子的散射特性进行比较;第三，将使用辐射传输模型模拟和比较不同混合状态下灰尘的辐射效应，以了解灰尘-污染-水相互作用对气候系统的影响。该项目涉及指导两名研究生成为下一代大气物理学家。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Thermal infrared dust optical depth and coarse-mode effective diameter over oceans retrieved from collocated MODIS and CALIOP observations

• DOI: 10.5194/acp-23-8271-2023
• 发表时间: 2023-07
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: Jianyu Zheng;Zhibo Zhang;Hongbin Yu;A. Garnier;Qianqian Song;Chenxi Wang;Claudia Di Biagio;J. Kok;Y. Derimian;C. Ryder