Study of Climate Change Mechanism in Cloud-Capped Planetary Boundary Layer over the Arctic Ocean Using a Hierarchy of Models Resolving Cloud Formation Processes

利用解析云形成过程的层次模型研究北冰洋云顶行星边界层的气候变化机制

• 批准号: 9415350
• 负责人: Victor Filyushkin
• 金额: $ 32.71万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-15 至 1996-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9415350&HistoricalAwards=false
• 关键词: Study; Climate; Change; Mechanism; Cloud

This project is a study of the radiative, microphysical, and dynamic properties of low stratiform clouds with the objective of improving the treatment of radiative transfer in general circulation models (GCMs) under varying cloud conditions, and to improve the parameterization of cloud formation and cloud properties in GCMs. A low overcast ("arctic stratus") is characteristic of the Arctic Ocean region, particularly in summer. These low clouds affect the radiation budget of both the free atmosphere and the sea ice surface. Their structure results from an interaction among the large-scale transport of heat and moisture into the Arctic, the macrophysical processes of boundary layer turbulence, and the microphysical and optical properties of liquid water droplets. In this project radiative cloud forcing and the transport of momentum, heat, and moisture will be modeled using a recently developed three-dimensional large eddy simulation model with explicit formulation of cloud microphysics. The model will be extended by introducing an adaptive grid near the top of the cloud layer, and adapting a two stream radiative scheme to parameterize cloud inhomogeneities and their effect on the radiation field.

该项目是对低层层状云的辐射、微物理和动力特性的研究，目的是改进大气环流模式在不同云条件下对辐射传输的处理，并改进大气环流模式中云形成和云特性的参数化。 低云（“北极层云”）是北冰洋地区的特征，特别是在夏季。 这些低云影响自由大气和海冰表面的辐射收支。 它们的结构是热量和水分大规模输送到北极、边界层湍流的宏观物理过程以及液态水滴的微观物理和光学特性之间相互作用的结果。 在这个项目中，辐射云强迫和动量，热量和水分的传输将使用最近开发的三维大涡模拟模式与云微物理显式配方建模。 该模式将通过在云层顶部附近引入自适应网格来扩展，并采用双流辐射方案来参数化云的不均匀性及其对辐射场的影响。