Dynamics of Tropical Intraseasonal Oscillation

这项研究是现有热带季节内振荡动力学研究项目的延续和扩展。研究的目的是加强对空间变化的平均热带环流中季节内扰动的复杂行为、它们与海洋混合层的相互作用及其在ENSO（厄尔尼诺-南方涛动）演变中的作用的物理认识。提出了三个研究重点：a)平均热带环流对季内扰动动力学的影响；b)海气界面变量的季内变化和海洋对大气季内扰动的影响；c)海洋对地面风的季节内变化的响应以及季节内和年际变化之间的联系。PI将采用理论与实证相结合的分析方法。现有项目开发的自由大气边界层耦合模型将扩展到包括基本流动和与海洋混合层模型的耦合，形成理论分析的动力学框架。欧洲中期天气预报中心（ECMWF）全球数据同化系统生成的临时COADS船舶报告（1980-1987）和TOGA海平面中心收集的海平面数据（1975-1987）将用于诊断研究。这项研究很重要，因为它试图提高对影响全球气候变率的气候过程的理解水平。

This research is a continuation and extension of an existing project on the study of dynamics of tropical intraseasonal oscillation. The objective of the study is to enhance physical understanding of the complex behavior of intraseasonal disturbances in spatially varying mean tropical circulations, their interactions with the oceanic mixed layer and their roles in ENSO (El Nino-southern Oscillation) evolution. Three research thrusts are proposed: a) Effects of mean tropical circulation on dynamics of the intraseasonal disturbances; b) Intraseasonal variations of air-sea interface variables and oceanic influence on atmospheric intraseasonal disturbances; c) Response of ocean to intraseasonal variation of surface winds and the links between intraseasonal and interannual variations. The PI will adopt a combination of theoretical and empirical analysis. A free atmosphere-boundary layer coupled model developed in the existing project will be extended to include basic flow and coupling with an ocean mixed layer model, forming a dynamics framework for theoretical analysis. Interim COADS ship reports (1980-1987) generated by global data assimilation systems of th European Center for Medium Range Weather Froecasts (ECMWF), and sea-level data collected at the TOGA Sea Level Center (1975-1987) will be used for diagnostic studies. This research is important because it attempts to increase the level of understanding of climate processes that influence climate variability around the world.