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Article

Impact of Increased Vertical Resolution in WACCM on the Climatology of Major Sudden Stratospheric Warmings

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Environmental Physics Laboratory (EPhysLab), Centro de Investigación Mariña (CIM-UVIGO), Universidade de Vigo, Edificio Campus da Auga, 32004 Ourense, Spain
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Departamento de Fisica, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Módulo V2, Olímpica, Gualadalajara 44430, Mexico
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Atmospheric Chemistry, Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80307, USA
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Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, Holešovičkách 2, 180 00 Prague 8, Czech Republic
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Institute of Meteorology and Climatology, University of Natural Resources and Life Sciences, Vienna Gregor-Mendel-Straße 33, 1180 Vienna, Austria
*
Author to whom correspondence should be addressed.
Academic Editor: Gareth Marshall
Atmosphere 2022, 13(4), 546; https://doi.org/10.3390/atmos13040546
Received: 17 February 2022 / Revised: 18 March 2022 / Accepted: 23 March 2022 / Published: 29 March 2022
(This article belongs to the Section Climatology)
Sudden stratospheric warmings (SSWs) are a major mode of variability of the winter stratosphere. In recent years, climate models have improved their ability to simulate SSWs. However, the representation of the frequency and temporal distribution of SSWs in models depends on many factors and remains challenging. The vertical resolution of a model might be one such factor. Therefore, here we analyse the impact of increased vertical resolution on the simulation of major sudden stratospheric warmings (SSWs) in the Whole Atmosphere Community Climate Model (WACCM). We compare two versions of the model, WACCM3.5 and WACCM4. We find that the frequency of occurrence of SSWs is improved in the newer version and closer to that obtained using reanalysis. Furthermore, simulations with a coupled ocean best reproduce the behaviour of temperature during these events. Increasing vertical resolution increases the number of occurrences; however, it does not produce significantly different results than standard resolution. WACCM4 also does not reproduce vortex split events well, generating far fewer of these than observed. Finally, the ratio between polar vortex splits and displacement events in the model is slightly better for non-ocean-coupled simulations. We conclude that, at least for WACCM4, the use of the high vertical resolution configuration is not cost-effective for the study of SSWs. View Full-Text
Keywords: SSWs; general circulation climate models; WACCM; polar vortex SSWs; general circulation climate models; WACCM; polar vortex
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MDPI and ACS Style

Chávez, V.M.; Añel, J.A.; Garcia, R.R.; Šácha, P.; Torre, L.d.l. Impact of Increased Vertical Resolution in WACCM on the Climatology of Major Sudden Stratospheric Warmings. Atmosphere 2022, 13, 546. https://doi.org/10.3390/atmos13040546

AMA Style

Chávez VM, Añel JA, Garcia RR, Šácha P, Torre Ldl. Impact of Increased Vertical Resolution in WACCM on the Climatology of Major Sudden Stratospheric Warmings. Atmosphere. 2022; 13(4):546. https://doi.org/10.3390/atmos13040546

Chicago/Turabian Style

Chávez, Víctor M., Juan A. Añel, Rolando R. Garcia, Petr Šácha, and Laura de la Torre. 2022. "Impact of Increased Vertical Resolution in WACCM on the Climatology of Major Sudden Stratospheric Warmings" Atmosphere 13, no. 4: 546. https://doi.org/10.3390/atmos13040546

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