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Discussion papers | Copyright
https://doi.org/10.5194/gmd-2018-124
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Methods for assessment of models 25 Jun 2018

Methods for assessment of models | 25 Jun 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

The TropD software package: Standardized methods for calculating Tropical Width Diagnostics

Ori Adam1, Kevin M. Grise2, Paul Staten3, Isla R. Simpson4, Sean M. Davis5,6, Nicholas A. Davis5,6, Darryn W. Waugh7, and Thomas Birner8,9 Ori Adam et al.
  • 1Hebrew University of Jerusalem, Israel
  • 2University of Virginia, USA
  • 3Indiana University, USA
  • 4National Center for Atmospheric Research, USA
  • 5NOAA Earth System Research Laboratory Chemical Sciences Division, USA
  • 6Cooperative Institute for Research in Environmental Sciences, University of Colorado, USA
  • 7Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore MD, USA
  • 8Colorado State University, USA
  • 9Meteorologisches Institut, Ludwig-Maximilians-Universität, Munich, Germany

Abstract. 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 a Tropical-width Diagnostics code package (TropD) 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.

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TropD: Tropical width diagnostics software package O. Adam, K. Grise, P. Staten, I. Simpson, S. M. Davis, D. W. Waugh, T. Birner, and N. A. Davis https://doi.org/10.5281/zenodo.1157044

Ori Adam et al.
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Due to incoherent methodologies, estimates of tropical width variations differ significantly across studies. Here, methods for eight commonly-used metrics of the tropical width are implemented in a Tropical-width Diagnostics code package (TropD). The method compilation and analysis provide tools and information which help reduce the methodological component of the uncertainty associated with calculations of the tropical width.
Due to incoherent methodologies, estimates of tropical width variations differ significantly...
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