Modeling of the Tropical Atmosphere-Ocean System

pi将继续并扩展他们以前对热带海洋和大气的模拟研究。一个主要的重点将是发展一种改进的大气加热参数化，同时考虑到边界层内部和上面的不同过程。这将得到现有的和计划中的基于观测（或分析）风的诊断研究以及GCM计算的帮助。他们的太平洋耦合模式将首先单独扩展到大西洋和印度洋部分，最后作为全球热带的耦合模式。这将包括迄今为止被忽略的陆地-大气相互作用的参数化。它们将设法查明由每个海洋部门内当地相互作用引起的气候变异的程度和性质，以及盆地间相互作用如何改变或加强这种变异。新的参数化将被纳入一个多层次的全球大气模式。将开发线性和原始方程版本。明确的边界层物理学将允许对实际的海洋强迫有一个更真实的描述，并允许相对无粘性的自由大气，这与他们以前的模型不同。该模式的长期耦合模拟将用于研究热带地区低频气候变化的机制。这个研究项目很重要，因为它将更多地揭示全球海洋和大气之间的耦合对气候变化的作用。

The PIs will continue, and expand upon, their previous modeling studies of the tropical oceans and atmosphere. A major focus will be the development of an improved atmospheric heating parameterization, taking into account the distinct processes operating within and above the boundary layer. This will be aided by existing and planned diagnostic studies based on observed (or analyzed) winds, as well as GCM calculations. Their Pacific coupled model will be extended to the Atlantic and Indian Ocean sectors, first individually, and finally as a coupled model of the global tropics. This will include parameterizations of land-atmosphere interactions that have thus far been ignored. They will seek to identify the extent and nature of climate variability that arises from local interactions within each oceanic sector, and the manner in which inter-basin interactions modify or enhance that variability. The new parameterizations will be incorporated into a multi- level, global atmospheric model. Both linear and primitive equation versions will be developed. Explicit boundary layer physics will permit a more realistic representation of the actual oceanic forcing, and allow for a relatively inviscid free atmosphere, in contrast to their previous model. Long-term coupled simulations with this model will be used to study the mechanisms of low frequency climate change in the tropics. This research project is important because it will shed more light on the role of the coupling between global oceans and the atmosphere on climate variability.