Low-Frequency Climate Response and Fluctuation–Dissipation Theorems: Theory and Practice
Low-Frequency Climate Response and Fluctuation–Dissipation Theorems: Theory and Practice
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低频气候响应和波动耗散定理：理论与实践
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Yuan Yuan
中科院分区：
文献类型：
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作者：
A. Majda;Boris Gershgorin;Yuan Yuan
气候系统各组成部分对外部强迫或其他参数变化的低频响应是当代气候变化科学的一个中心问题。波动耗散定理（FDT）是利用当前气候的统计量来评估气候变化的一种有吸引力的方法；利用系统近似值，最近已显示出对大气环流模式（GCM）的适宜区有很高的技巧。FDT在低频气候响应中的进一步应用需要在已解变量的简化子空间上改进FDT的近似值。在这里，系统的数学原理被用于在简化子空间上开发新的FDT近似，并评估低频变量对FDT响应的小而重要的偏离。本文利用模拟gcm关键特征的简化测试模型，以明确的方式阐明这些问题和各种FDT近似。此外,……
Abstract The low-frequency response to changes in external forcing or other parameters for various components of the climate system is a central problem of contemporary climate change science. The fluctuation–dissipation theorem (FDT) is an attractive way to assess climate change by utilizing statistics of the present climate; with systematic approximations, it has been shown recently to have high skill for suitable regimes of an atmospheric general circulation model (GCM). Further applications of FDT to low-frequency climate response require improved approximations for FDT on a reduced subspace of resolved variables. Here, systematic mathematical principles are utilized to develop new FDT approximations on reduced subspaces and to assess the small yet significant departures from Gaussianity in low-frequency variables on the FDT response. Simplified test models mimicking crucial features in GCMs are utilized here to elucidate these issues and various FDT approximations in an unambiguous fashion. Also, the...