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首页> 外文会议>Tenth ECMWF Workshop on the Use of High Performance Computing in Meteorology; Nov 4-8, 2002; Reading, UK >EDDY RESOLVED ECOSYSTEM MODELLING IN THE IRISH SEA
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EDDY RESOLVED ECOSYSTEM MODELLING IN THE IRISH SEA

机译：爱尔兰海中涡旋分解的生态系统建模

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摘要

A computationally efficient three-dimensional modelling system (Proudman Oceanographic Laboratory Coastal-Ocean Modelling System, POLCOMS) has been developed for the simulation of shelf-sea, ocean and coupled shelf-ocean processes. The system is equally suited for use on single processor workstations and massively parallel supercomputers, and particular features of its numerics are an arbitrary (terrain following) vertical coordinate system, a feature preserving advection scheme and accurate calculation of horizontal pressure gradients, even in the presence of steep topography. One of the roles of this system is to act as a host to ecosystem models, so that they can interact with as accurate a physical environment as is currently feasible. In this study, a hierarchy of nested models links the shelf-wide circulation and ecosystem, via a high resolution physics model of the whole Irish Sea, to the test domain: a region of the western Irish Sea. In this domain, ecosystem models are tested at a resolution of ～1.5km (c.f. the typical summer Rossby radius of 4km). Investigations in the physics-only model show the significance of advective processes (particularly shear diffusion and baroclinic eddies) in determining the vertical and horizontal temperature structure in this region. Here we investigate how a hierarchy of complexity (and computational load) from a 1D point model to a fully 3D eddy resolved model affects the distribution of phytoplankton (and primary production) and nutrients predicted by the European Regional Seas Ecosystem Model (ERSEM), a complex multi-compartment ecosystem model. We shall also show how the parallel programming features of the POLCOMS code allows large-scale simulations to be earned out on hundreds, and now on over a thousand, processors, approaching Teraflop/s performance levels. This is shown using a series of benchmark runs on the 1280 processor IBM POWER4 system operated by the UK's HPCx Consortium.
机译：已经开发了一种计算效率高的三维建模系统（Proudman海洋学实验室沿海-海洋建模系统，POLCOMS），用于模拟海，海洋和海相耦合海面过程。该系统同样适合在单处理器工作站和大规模并行超级计算机上使用，并且其数字的特殊功能是任意（地形跟随）垂直坐标系，功能保留对流方案和精确计算水平压力梯度（即使存在）陡峭的地形。该系统的作用之一是充当生态系统模型的宿主，以便它们可以与当前可行的精确物理环境进行交互。在这项研究中，嵌套模型的层次结构通过整个爱尔兰海的高分辨率物理模型，将整个大陆架的环流和生态系统链接到测试域：爱尔兰西部海域。在这个领域中，以〜1.5km的分辨率（参见典型的夏季罗斯比半径4km）测试了生态系统模型。仅物理学模型的研究表明平流过程（特别是剪切扩散和斜压涡流）在确定该区域的垂直和水平温度结构方面的重要性。在这里，我们研究了从1D点模型到完全3D涡旋解析模型的复杂性层次（和计算负荷）如何影响浮游植物（和初级生产）和营养的分布，这些分布由欧洲区域海洋生态系统模型（ERSEM）预测，复杂的多室生态系统模型。我们还将展示POLCOMS代码的并行编程功能如何允许在接近Teraflop / s性能水平的数百个（现在超过一千个）处理器上进行大规模仿真。使用在由英国HPCx联盟运营的1280处理器IBM POWER4系统上进行的一系列基准测试可以看出这一点。

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