Nine time steps: ultra-fast statistical consistency testing of the Community Earth System Model (pyCECT v3.0)

Journal Article · 26 February 2018 · Geoscientific Model Development (Online)

DOI: https://doi.org/10.5194/gmd-11-697-2018 · OSTI ID:1524175

Milroy, Daniel J.  ^[1]; Baker, Allison H. ^[2]; Hammerling, Dorit M.  ^[2]; Jessup, Elizabeth R.  ^[1]

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1. Univ. of Colorado, Boulder, CO (United States)
2. National Center for Atmospheric Research, Boulder, CO (United States)

The Community Earth System Model Ensemble Consistency Test (CESM-ECT) suitewas developed as an alternative to requiring bit wise identical output for quality assurance. This objective test provides a statistical measurement of consistency between an accepted ensemble created by small initial temperature perturbations and a test set of CESM simulations. Here, we extend the CESM-ECT suite with an inexpensive and robust test for ensemble consistency that is applied to Community Atmospheric Model (CAM) output after only nine model time steps. We suggest that adequate ensemble variability is achieved with instantaneous variable values at the ninth step, despite rapid perturbation growth and heterogeneous variable spread. We refer to this new test as the Ultra-Fast CAM Ensemble Consistency Test (UF-CAM-ECT) and demonstrate its effectiveness in practice, including its ability to detect small-scale events and its applicability to the Community Land Model (CLM).The new ultra-fast test facilitates CESM development, porting, and optimization efforts, particularly when used to complement information fromthe original CESM-ECT suite of tools.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 1524175
• Journal Information: Geoscientific Model Development (Online), Journal Name: Geoscientific Model Development (Online) Journal Issue: 2 Vol. 11; ISSN 1991-9603
• Publisher: European Geosciences UnionCopyright Statement
• Country of Publication: United States
• Language: English