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Formulating an inverse problem to infer the accumulation-rate pattern from deep internal layering in an ice sheet using a Monte Carlo approach

机译:提出反问题,使用蒙特卡洛方法从冰盖内的深层内部推断积聚速率模式

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Using a Monte Carlo (MC) method, we determine the accumulation-rate profile along a flowband, the influx of ice into the upstream end of the flowband and the age of an internal layer. The data comprise the depth profile of the internal layer, a few velocity measurements at the surface andthe average accumulation at one location. The data in our example were collected at Taylor Mouth, a flank site off Taylor Dome, Antarctica. We present three alternative formulations of this inverse problem. Depending on the formulation used, this particular inverse problem can have up to four solutions, each corresponding to a different spatial accumulation-rate pattern. This study demonstrates the ability of a MC method to find several solutions to this inverse problem, and how to use a Metropolis algorithm to determine the probability distribution of each of these different solutions. The only disadvantage of the MC method is that it is computationally more expensive than other inverse methods, such as the Gradient method.
机译:使用蒙特卡洛(MC)方法,我们确定了沿流带的积聚速率分布,冰向流带上游端的涌入以及内层的年龄。数据包括内层的深度剖面,表面的一些速度测量值和一个位置的平均堆积量。本例中的数据是在南极泰勒巨蛋旁的泰勒·穆特(Taylor Mouth)收集的。我们提出了这个反问题的三种替代形式。根据所使用的公式,这个特定的反问题最多可以具有四个解,每个解对应于不同的空间累积速率模式。这项研究证明了MC方法能够找到该反问题的几种解决方案的能力,以及如何使用Metropolis算法确定这些不同解决方案中每一种的概率分布。 MC方法的唯一缺点是,它在计算上比其他逆方法(例如Gradient方法)更昂贵。

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