Adiabatically Correcting an Eddy-Permitting Model Using Large-Scale Hydrographic Data: Application to the Gulf Stream and the North Atlantic Current
Adiabatically Correcting an Eddy-Permitting Model Using Large-Scale Hydrographic Data: Application to the Gulf Stream and the North Atlantic Current
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使用大规模水文数据绝热校正涡允许模型：在墨西哥湾流和北大西洋洋流中的应用
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
C. Böning
中科院分区：
文献类型：
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作者：
C. Eden;R. Greatbatch;C. Böning
这项研究的重点是模式中海气相互作用的一个重要方面，即由于纽芬兰南部和东部的“风暴形成区”中墨西哥湾流和北大西洋洋流（NAC）的错误路径而产生的大规模虚假热通量。虽然高分辨率的涡分辨模式在这方面显示出一些改进，结果是敏感的知之甚少，亚网格尺度的过程，目前没有完整的，基于物理的参数化。本文探讨了一种简单的海洋环流模式（OGCM）修正方法，即最近提出的“半预报法”，它是一种对静力海洋环流模式（OGCM）的流动特性进行自动修正的技术。作者表明，该方法的应用程序的涡流允许模型的北大西洋产生更真实的流型和水团特性在墨西哥湾流和NAC地区，特别是，虚假的表面热通量减少。提出了四个简单的修改方法，并证明了它们的好处。修正成功地解释了原方法的三个缺点：减少地转波速度，阻尼中尺度涡动活动，和虚假的相互作用与地形。有人认为，使用校正（涡流允许）OGCM在耦合模拟系统中模拟目前的气候（现在成为可能，因为越来越多的计算机能力），应导致更现实的模拟强海气相互作用的地区相比，与未校正的模式。该方法也非常适合模拟被动示踪剂的吸收和运输，如人为二氧化碳或生态系统模型的组成部分。
This study focuses on an important aspect of air‐sea interaction in models, namely, large-scale, spurious heat fluxes due to false pathways of the Gulf Stream and North Atlantic Current (NAC) in the ‘‘storm formation region’’ south and east of Newfoundland. Although high-resolution eddy-resolving models show some improvement in this respect, results are sensitive to poorly understood, subgrid-scale processes for which there is currently no complete, physically based parameterization. A simple method to correct an ocean general circulation model (OGCM), acting as a practical substitute for a physically based parameterization, is explored: the recently proposed ‘‘semiprognostic method,’’ a technique for adiabatically adjusting flow properties of a hydrostatic OGCM. The authors show that application of the method to an eddy-permitting model of the North Atlantic Ocean yields more realistic flow patterns and watermass characteristics in the Gulf Stream and NAC regions; in particular, spurious surface heat fluxes are reduced. Four simple modifications to the method are proposed, and their benefits are demonstrated. The modifications successfully account for three drawbacks of the original method: reduced geostrophic wave speeds, damped mesoscale eddy activity, and spurious interaction with topography. It is argued that use of a corrected (eddy permitting) OGCM in a coupled modeling system for simulating present climate (as now becomes possible because of increasing computer power) should lead to a more realistic simulation in regions of strong air‐sea interaction as compared with that obtained with an uncorrected model. The method is also well suited for the simulation of the uptake and transport of passive tracers, such as anthropogenic carbon dioxide or components of ecosystem models.