Impact of Surface-Cloud Coupling on Aerosol-Radiation- Cloud-Interactions for Boundary-layer Clouds over Land and Oceans

地面-云耦合对陆地和海洋边界层云气溶胶-辐射-云-相互作用的影响

• 批准号: 2126098
• 负责人: Zhanqing Li
• 金额: $ 78.88万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2126098&HistoricalAwards=false
• 关键词: Impact; Surface; Cloud; Coupling; Aerosol

The project seeks funding to investigate impacts of heating from the earth’s surface in transporting tiny particles (also called aerosols) and water vapor in the atmosphere upward to form clouds and precipitation as well as how aerosols and clouds affect the surface heating by blocking sunlight or the surface cooling by blocking the surface heat release---the process is called radiation. Aerosols are found mostly in the air layer of about 1 mile above the earth surface, which is also called the planetary boundary layer (PBL). Meteorology and the atmospheric environment in the PBL are of utmost importance to our lives. Interactions between aerosols/clouds and the earth’s surface are among the most uncertain factors in weather forecasting and climate studies. This project aims to improve understanding of some fundamental processes governing the interactions over both land and oceans. By examining the development of boundary-layer clouds and aerosol transport in the context of the surface-cloud coupling, this project will help advance our understanding of extreme weather, climate change, and air pollution, which are critical to the society. The research project will train young scientists to become the future generation of scientists and educators to understand and resolve problems facing weather forecasts.The overarching question of the proposed study is how aerosol-radiation interactions (ARI) and aerosol-cloud interactions (ACI) are affected by the coupling between clouds and the surface or the PBL for both continental and marine clouds. Because the coupling between clouds and the surface is expected to play an important role in regulating ARI and ACI, the project will sort out the boundary-layer processes dictated by the cloud-PBL-surface coupling. The study will test the hypotheses: (1) absorbing aerosols inhibit heat fluxes and the entrainment process of the PBL, suppressing convection initiation, and the development of continental cumulus clouds; (2) the fraction of surface cloud condensation nuclei reaching the marine cloud layer is lower under the decoupled condition, leading to markedly weaker ACI with weakened impacts on precipitation, whereas the opposite is the case for the coupled condition. Using comprehensive field observations, this project will investigate the impacts of ARI and ACI on the vertical distribution of heat fluxes, entrainment, and convection initiation for different surface-cloud coupling states. The project will also explore how the decoupling between clouds and the surface regulates aerosol vertical transport and how cloud micro- and macro-physical properties respond to the coupling state. These tasks will also help quantify the magnitudes of both individual and joint effects of ACI and ARI.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.

该项目寻求资金来研究从地球表面的供暖在运输微小颗粒（也称为气溶胶）和大气中的水蒸气中的影响，以形成云和降水量以及气溶胶和云如何通过阻断阳光或通过阻断表面冷却来影响表面加热，从而通过阻断表面冷却来释放表面热量 - 流程释放 - 辐射是辐射的。气溶胶主要在地面上方约1英里的空气层中发现，这也称为行星边界层（PBL）。 PBL中的气象和大气环境对我们的生活至关重要。气溶胶/云与地球表面之间的相互作用是天气预报和气候研究中最不确定的因素之一。该项目旨在提高对统治土地和海洋相互作用的一些基本过程的理解。通过检查在表面云耦合的背景下，通过检查边界层云和气溶胶运输的发展，该项目将有助于促进我们对对社会至关重要的极端天气，气候变化和空气污染的理解。该研究项目将培训年轻科学家，成为未来的科学家和教育工作者，以理解和解决面临天气前进的问题。拟议的研究的总体问题是气溶胶辐射相互作用（ARI）和气溶胶 - 云相互作用（ACI）如何受到云与表面之间的耦合或PBL之间的耦合和持续的clone clone和Marine contuleudulefulefulefulefulefulefulefulefulefulefulefulefulefulefulefulefulefulefulefulefulefullous clouds。由于预计云和表面之间的耦合在调节ARI和ACI中起重要作用，因此该项目将整理由云PBL-SURFACE耦合所决定的边界层过程。该研究将检验假设：（1）吸收气溶胶抑制热通量和PBL的入口过程，抑制连接的起始以及连续的积云云的发展； （2）在脱钩的情况下，表面云凝结核的比例较低，导致ACI明显弱，对降水的影响较弱，而耦合条件则相反。使用全面的现场观测，该项目将研究ARI和ACI对不同表面云耦合状态的热通量，入口和转化计划的垂直分布的影响。该项目还将探讨云与表面之间的分离如何调节气溶胶垂直传输以及云微型和宏观物理特性如何响应耦合状态。这些任务还将有助于量化ACI和ARI的个人和联合影响的幅度。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，认为通过评估被认为是宝贵的支持。

项目成果

Methodology to determine the coupling of continental clouds with surface and boundary layer height under cloudy conditions from lidar and meteorological data

• DOI: 10.5194/acp-22-1453-2022
• 发表时间: 2022-01
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: T. Su;Youtong Zheng;Zhanqing Li

Surface‐Atmosphere Decoupling Prolongs Cloud Lifetime Under Warm Advection Due To Reduced Entrainment Drying

• DOI: 10.1029/2022gl101663
• 发表时间: 2023-05
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Haipeng Zhang;Youtong Zheng;Seoung-Soo Lee;Zhanqing Li

Aerosol-boundary layer interaction modulated entrainment process

• DOI: 10.1038/s41612-022-00283-1
• 发表时间: 2022-08
• 期刊: npj Climate and Atmospheric Science
• 影响因子: 9
• 作者: T. Su;Zhanqing Li;Youtong Zheng;Tong Wu;Hao Wu;Jianping Guo