Intraseasonal Variability of Atmospheric Large-Scale Environment for Deep Convection in the Western Pacific

美国华盛顿赤东大学ATM-9320193项目标题：西太平洋大气深对流大尺度环境的季节内变异性研究热带全球大气耦合海洋大气响应试验强化观测期热带季节内振荡的三个事件。将分析在COARE IOP(1992年11月1日至1993年2月28日)期间从热带大气海洋系泊阵列、船舶、地面和探空站以及日本地球同步气象卫星(GMS)收集的数据，以及从欧洲中期天气预报中心(ECMWF)收集的风分析。拟开展的研究将侧重于在季节内时间尺度上促进或超过深对流的大尺度大气环境的可变性。具体地说，拟议的项目将：(1)探测地面风和辐合、地面/边界层热力条件(包括地面湍流热通量、湿度和温度、湿静力能等)、大气垂直热力学和动力结构以及地面降水的季节内可变性；(2)探索这些变量与对流层风和卫星云量的季节内相干特征，这些变量按面积范围和云顶高度细分。通过对COARE IOP期间的三次TiO事件的案例研究，PI和该项目的合作研究者将尝试对TiO的大尺度动态和热力学结构进行综合观察。综合观点将包括三维风场、地面和边界层热力条件、大气垂直结构、对流云的数量和组织、降水以及与其相关的海气相互作用特征的空间结构、演变和相互关系。本项目的研究结果将为加深我们对二氧化钛的整体认识，改进和验证二氧化钛的理论和数值模拟提供必要的信息。

Abstract ATM-9320193 Zhang, Chidong University of Washington Title: Intraseasonal Variability of Atmospheric Large-Scale Environment for Deep Convection in the Western Pacific Case and composite studies are proposed to investigate three events of the tropical intraseasonal oscillation (TIO) during the Intensive Observing Period (IOP) of the Tropical Ocean Global Atmosphere (TOGA) Coupled Ocean Atmosphere Response Experiment (COARE). Data collected during the COARE IOP (1 November 1992 - 28 February 1993) from the Tropical Atmosphere Ocean (TAO) mooring arrays, ships, surface and sounding stations, and Japanese Geosynchronic Meteorology Satellite (GMS), and wind analyses from the European Centre for Medium Range Weather Forecast (ECMWF) will be analyzed. The proposed research will focus on the variability of large-scale atmospheric environment in which deep convection is promoted or surpassed on the intraseasonal time scales. Specifically, the proposed project will: (i) Detect the intraseasonal variability of surface wind and convergence, surface/boundary-layer thermal conditions (including surface turbulent heat fluxes, humidity and temperature, moist static energy, etc.), vertical thermodynamic and dynamic structures of the atmosphere, and surface precipitation; (ii) Explore intraseasonal coherent signatures of these variables with tropospheric winds and satellite cloud entitles subdivided by areal extent and cloud-top height. Through the case studies of the three TIO events during the COARE IOP, the PI and the co-investigators of the project will attempt a synthesized view of the large-scale dynamic and thermodynamic structures of the TIO. The synthesized view of the TIO will include the spatial structures, evolutions, and interrelationships of three-dimensional wind field, surface and boundary-layer thermal conditions, atmospheric vertical structures, convective cloud populations and organization, precipitation, and characteri stics of air-sea interactions associated with the TIO. The results from this project will provide necessary information for enhancement of our overall understanding of the TIO and for improvement and validation of theories and numerical modeling of the TIO.