Effects of Space-Time Dynamics of Surface Processes on Land-Atmosphere Interactions at the Mesoscale

地表过程时空动力学对中尺度陆地-大气相互作用的影响

• 批准号: 9526628
• 负责人: Shafiqul Islam
• 金额: $ 14万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-04-15 至 2000-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526628&HistoricalAwards=false
• 关键词: Effects; Space; Time; Dynamics; Surface

9526628 Islam The goal of this proposal is to investigate the space-time dynamics of land-surface processes on land-atmosphere interactions at the mesoscale. The achieve this goal, a well coordinated observational data analysis and numerical modeling approach will be pursued. Following are the main tasks of this research: *Explore the use of MM5 as the atmospheric module to refine the coupled land-atmosphere model *Compare the land surface response of the coupled land-atmosphere model with the FIFE data. *Establish a spin-up time scale as a function of initial atmospheric states and initial land surface states. Examine the dependence of spin-up time on the nature of forcing data. *Develop a methodology to asses the effects of spatial heterogeneity on the response of near-surface atmospheric processes. Evaluate the relationships between characteristic scales of variabilities in soil wetness and space time dynamics of evapotranspiration and near-surface atmospheric variables. Identify the physical mechanisms that control the space-time scales of soil wetness anomalies. This proposal is designed to characterize the space-time dynamics of land surface hydrology and atmospheric response by using a coupled land-atmosphere model and measured datasets from the FIFE and Washita '92 sites. Resulting information from this research would provide the incremental knowledge needed for accurate interpretation and widespread application of mesoscale models and field experiments for land-atmosphere interaction studies. They will aid in addressing the spin-up and scaling properties of mesoscale models and in developing realistic land-surface hydrology parameterizations for atmospheric models. In addition, this effort is directly relevant to scaling of water and energy fluxes and testing and evaluation of coupled land-atmosphere model segments of the GCIP GEWEX (Global Energy and Water Cycle Experiment) Continental-Scale International Project and EOS (Earth Observing System) science plans.

小行星9526628 该方案的目标是研究中尺度陆-气相互作用的陆-面过程的时空动力学。 为实现这一目标，将采用一种协调良好的观测数据分析和数值模拟方法。 本文的主要研究工作如下：* 探索利用MM 5作为大气模式对陆气耦合模式进行精化 * 比较陆气耦合模式的陆面响应与FIFE数据。 * 根据初始大气状态和初始陆地表面状态建立起旋时间尺度。 检查自旋时间对强迫数据性质的依赖性。 * 制定一种方法来评估空间异质性对近地面大气过程的影响。 评价土壤湿度变异特征尺度与蒸散量时空动态和近地面大气变量之间的关系。 确定控制土壤湿度异常时空尺度的物理机制。 该提案旨在通过使用耦合的陆地-大气模型和来自FIFE和Washita '92站点的测量数据集来表征陆地表面水文和大气响应的时空动态。 这项研究产生的信息将提供准确解释和广泛应用陆地-大气相互作用研究中尺度模型和现场实验所需的增量知识。 它们将有助于解决中尺度模型的旋转和缩放特性，并为大气模型制定切合实际的地表水文参数。 此外，这项工作还直接关系到水和能量通量的定标以及全球气候方案GEWEX（全球能源和水循环实验）大陆尺度国际项目和地球观测系统科学计划的陆地-大气耦合模型部分的测试和评价。