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.

矿物灰尘是地球系统不可或缺的组成部分，它通过与能量，水和碳周期的复杂相互作用来影响天气和气候。一旦高高，尘埃就可以被风携带，以进行洲际甚至半球形运输。在远距离运输过程中，粉尘颗粒可以与污染物（例如硫酸铵，硝酸铵，盐酸和生物质燃烧颗粒）混合，从而导致灰尘组成和吸湿性的变化，从而影响尘埃与水的相互作用。过去，许多研究调查了纯，未污染的尘埃气溶胶与辐射（例如阳光，红外辐射和激光信号）的相互作用。然而，污染尘埃和水合灰尘的散射行为仍然鲜为人知，这破坏了我们对粉尘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测灰尘气溶胶的能力。 该项目是研究与污染物和水的微物理相互作用如何影响灰尘气溶胶的散射特性，并评估对粉尘辐射效应和灰尘遥感的影响。通过重大任务实现了这一目标：首先，不同尺寸和不同波长的不同混合状态下尘埃颗粒的散射特性，包括纯灰尘，涂层灰尘和灰尘 - 灰尘凝结，将使用先进的散射模型来计算；其次，将内部混合粉尘颗粒的散射特性与纯灰尘的散射特性进行比较。第三，辐射转移模型将用于模拟和比较不同混合状态下尘埃的辐射效应，以了解粉尘污染 - 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的法定任务，并使用基金会的知识分子优点和更广泛的影响标准，被认为值得通过评估来获得支持。

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