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

题目：为研究热带海洋-全球大气（TOGA）耦合海洋-大气响应试验（COARE）密集观测期（IOP）热带季节内振荡（TIO）的三个事件，提出了西太平洋深对流大尺度大气环境的季节内变率和复合研究。将分析COARE IOP（1992年11月1日至1993年2月28日）期间从热带大气海洋（TAO）系泊阵列、船舶、地面站和探测站以及日本地球同步气象卫星（GMS）收集的数据，以及欧洲中期天气预报中心（ECMWF）的风分析。在季节内时间尺度上，重点研究深层对流被促进或超越的大尺度大气环境的变率。具体而言，该项目将：(i)探测地表风和辐合的季节内变化、地表/边界层热条件（包括地表湍流热通量、湿度和温度、湿静态能等）、大气的垂直热力学和动力结构以及地面降水；探讨这些变量与对流层风和按面积范围和云顶高度细分的卫星云量的季节内连贯特征。通过对COARE IOP期间三个TIO事件的案例研究，PI和该项目的共同研究者将尝试对TIO的大尺度动力学和热力学结构进行综合观察。TIO的综合视图将包括三维风场的空间结构、演变和相互关系、地面和边界层热条件、大气垂直结构、对流云的数量和组织、降水以及与TIO相关的海气相互作用特征。该项目的结果将提供必要的信息，以提高我们对TIO的整体认识，并改进和验证TIO的理论和数值模拟。

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.