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arXiv 1601.00129math.NAcs.NAstat.APstat.CO
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降阶混合蒙特卡洛采样平滑器

The Reduced-Order Hybrid Monte Carlo Sampling Smoother

Virginia Polytechnic Institute and State University(弗吉尼亚理工大学)

Ahmed Attia, Razvan Stefanescu, Adrian Sandu

AI总结:

本文提出基于降阶近似的高效混合蒙特卡洛采样平滑器,用于四维变分数据同化,通过浅水方程验证其在准确性和速度上的优势。

摘要:

混合蒙特卡洛(HMC)采样平滑器是一种完全非高斯的四维数据同化算法,通过在贝叶斯框架下直接采样后验分布。其原始形式由于需要反复运行正向和伴随模型而计算成本高。本文提出基于底层模型动力学降阶近似的高效HMC采样平滑器版本。所开发的方案通过笛卡尔坐标系下的浅水方程模型进行数值测试。结果表明,降阶版本的平滑器能够准确捕捉后验概率密度,同时显著快于原始全阶形式。

英文摘要:

Hybrid Monte-Carlo (HMC) sampling smoother is a fully non-Gaussian four-dimensional data assimilation algorithm that works by directly sampling the posterior distribution formulated in the Bayesian framework. The smoother in its original formulation is computationally expensive due to the intrinsic requirement of running the forward and adjoint models repeatedly. Here we present computationally efficient versions of the HMC sampling smoother based on reduced-order approximations of the underlying model dynamics. The schemes developed herein are tested numerically using the shallow-water equations model on Cartesian coordinates. The results reveal that the reduced-order versions of the smoother are capable of accurately capturing the posterior probability density, while being significantly faster than the original full order formulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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