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

摘要ATM-9320193 Zhang，Chidong University of华盛顿标题： 大气大尺度的季节内变率 西太平洋深对流的环境 对热带海洋-全球大气耦合试验（TOGA）中的三次热带季节内振荡（TIO）事件进行了个例和合成研究。 将分析COARE IOP期间（1992年11月1日至1993年2月28日）从热带大气海洋系泊阵列、船舶、地面和探测站以及日本地球同步气象卫星收集的数据和欧洲中期天气预报中心的风分析。 拟议的研究将集中在大尺度大气环境的变化，其中深对流是促进或超越的季节内时间尺度。 具体而言，拟议项目将： (i)探测地面风和辐合的季节内变化、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），大气的垂直热力学和动力学结构以及地面降水; (ii)探索这些变量的季节内相干特征，对流层风和卫星云图按区域范围和云顶高度细分。 通过对COARE IOP期间三次TIO事件的案例研究，PI和该项目的合作研究人员将尝试对TIO的大尺度动力学和热力学结构进行综合分析。 TIO的综合视图将包括三维风场、地面和边界层热条件、大气垂直结构、对流云种群和组织、降水以及与TIO相关的海气相互作用的特征的空间结构、演变和相互关系。 本计画之研究结果将提供必要之资讯，以增进我们对TIO之整体了解，并为TIO理论与数值模拟之改良与验证提供参考。

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.