...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nonlinear processes in geophysics >Grid resolution dependence in the reconstruction of an atmospheric tracer source
【24h】

Grid resolution dependence in the reconstruction of an atmospheric tracer source

机译：大气示踪剂源重建中的网格分辨率依赖性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Methods for reconstructing sources of inert atmospheric tracers from ground measurements are currently studied, tested, and even implemented (in accident-type radionuclide release backtracking, for retrieval of carbon fluxes). Often the retrieved source exhibits a very strong and unrealistic (therefore unwanted) influence by the observation sites. This problem is shown not to be an intrinsic flaw of the reconstruction methods but rather due to the specifics of the atmospheric dispersion of a tracer, to the location of the receptors and to the expected source location. It is increasingly pronounced as the grid resolution for the source is improved, and we show how this translates mathematically. We rely on the general framework of inversion methods based on the maximum entropy on the mean principle. Those methods are well suited for accident-type tracer release problems. The dependence of the reconstruction on grid resolution is investigated both analytically and numerically, in conjunction with the issue of receptor influence. Two examples of synthetic experiments are given. The first one is a one-dimensional toy model which quantitatively validates the approach. The second one is based on the European Tracer Experiment and agrees well with the results obtained here. Finally, a generalization of the formalism is proposed so as to study the performance of reconstructions when observation and possibly model errors are present.
机译：目前正在研究，测试甚至实施从地面测量值重建惰性大气示踪剂来源的方法（在事故型放射性核素释放回溯中，以获取碳通量）。通常，检索到的源受到观察点的影响非常强烈且不切实际（因此是不需要的）。该问题并非是重建方法的内在缺陷，而是由于示踪剂在大气中的扩散特性，受体的位置以及预期的放射源位置所致。随着源的网格分辨率的提高，它变得越来越明显，并且我们展示了它如何进行数学转换。我们依靠基于均值原理的最大熵的反演方法的一般框架。这些方法非常适合于意外类型的示踪剂释放问题。结合受体影响问题，通过分析和数值研究重建对网格分辨率的依赖性。给出了两个合成实验的例子。第一个是一维玩具模型，可定量验证该方法。第二个基于欧洲示踪剂实验，与此处获得的结果非常吻合。最后，对形式主义进行了概括，以研究存在观察误差和可能存在模型误差时的重构性能。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号