The TropD software package (v1): standardized methods for calculating tropical-width diagnostics
The TropD software package (v1): standardized methods for calculating tropical-width diagnostics
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DOI：
10.5194/gmd-11-4339-2018
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发表时间：
2018-10-26
影响因子：
5.1
通讯作者：
Ming, Alison
中科院分区：
文献类型：
--
作者：
Adam, Ori;Grise, Kevin M.;Ming, Alison
观测和模拟研究表明，地球的热带在世纪后期已经扩大，并将在整个世纪继续扩大。然而，对热带宽度变化的估计在不同研究中存在显著差异。这种不确定性在某种程度上是未知的，部分原因是在热带宽度的研究中使用了各种各样的方法。在这里，热带宽度的八个常用指标的方法在MATLAB编程语言的热带宽度诊断（TropD）代码包中实现。为了合并各种方法，在每个实现的方法中使用的操作被减少到两个基本计算：找到零交叉的纬度和找到最大值的纬度。提供了在代码中实现的方法和代码语法的详细描述，然后是每个度量的方法敏感性分析。该分析提供了关于如何减少与计算的基本方面有关的不确定性的方法组成部分的信息，例如每月与季节平均偏差、网格依赖性、对噪音的敏感性和对阈值标准的敏感性。
Observational and modeling studies suggest that Earth's tropical belt has widened over the late 20th century and will continue to widen throughout the 21st century. Yet, estimates of tropical-width variations differ significantly across studies. This uncertainty, to an unknown degree, is partly due to the large variety of methods used in studies of the tropical width. Here, methods for eight commonly used metrics of the tropical width are implemented in the Tropical-width Diagnostics (TropD) code package in the MATLAB programming language. To consolidate the various methods, the operations used in each of the implemented methods are reduced to two basic calculations: finding the latitude of a zero crossing and finding the latitude of a maximum. A detailed description of the methods implemented in the code and of the code syntax is provided, followed by a method sensitivity analysis for each of the metrics. The analysis provides information on how to reduce the methodological component of the uncertainty associated with fundamental aspects of the calculations, such as monthly vs. seasonal averaging biases, grid dependence, sensitivity to noise, and sensitivity to threshold criteria.