青藏高原东南缘典型农田和森林下垫面关键陆面物理过程研究

项目名称： 青藏高原东南缘典型农田和森林下垫面关键陆面物理过程研究

项目编号： No.41505010

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 张果

作者单位： 中国气象科学研究院

项目金额： 21万元

中文摘要： 青藏高原东南缘是青藏高原热源非绝热加热的敏感区，该区域的陆面和大气基本状况对邻近区域及东亚大气环流的变化有着重要的影响，但是系统评估青藏高原东南缘典型农田和森林下垫面关键陆面物理过程的研究还较少。本研究拟利用青藏高原典型农田和森林边界层观测数据，通过Noah-MP陆面过程多参数化物理集合模拟，系统评估两种下垫面陆面过程参数化方案的敏感性，确定典型农田和森林下垫面的关键(最敏感)陆面物理过程并提取最优方案配置。通过分析两种下垫面关键陆面物理过程及最优参数化方案的异同，结合对不同下垫面野外观测数据和遥感数据的深入分析，订正Noah-MP关键陆面物理过程相关物理参数，从而优化已有关键物理过程参数化方案。通过定量评估关键陆面物理过程参数化方案的优化对陆气通量模拟的影响，揭示关键物理过程影响青藏高原东南缘陆-气通量交换的内在机制，为深入发展青藏高原东南缘陆面过程模式提供参考。

中文关键词： 青藏高原；典型下垫面；物理集合；陆气相互作用；敏感性

英文摘要： The Southeastern side of Tibetan Plateau is the non-adiabatic heating sensitive area for the heat source over the Tibetan Plateau. The land and atmospheric states over this area have important impact on the general atmospheric circulation in adjacent areas and Eastern Asia. But there are still few studies on systematic evaluation of key land surface processes over typical cropland and forest on Southeastern Tibetan Plateau. In this project, the sensitivities of different land surface process schemes will be evaluated systematically through employing typical cropland and forest field observations, and the key (most sensitive) land surface processes will be identified and the optimal physical parameterizations set will be extracted by building Noah-MP multi-parameterizations physics ensemble system of land surface process. Based on comparison of similarities and differences of the key land surface processes and optimal schemes over two different underlying surfaces, in combination with the analysis of field observations and remote sensing data, the relative physical parameters and parameterizations will be modified and optimized in Noah-MP land surface model. Through quantifying the influence of modified parameters and parameterizations on the flux simulation, the intrinsic mechanism how the crucial land surface processes impact land-atmospheric flux exchange will be investigated. This study will benefit the further development of land surface model appropriate for typical cropland and forest ecosystem over Southeastern Tibetan Plateau.

英文关键词： Tibetan Plateau;Typical underlying surface;Physical ensemble;Land-atmospheric interaction;Sensitivity