Articles | Volume 17, issue 18
Atmos. Chem. Phys., 17, 11193–11207, 2017

Special issue: The SPARC Reanalysis Intercomparison Project (S-RIP) (ACP/ESSD...

Atmos. Chem. Phys., 17, 11193–11207, 2017

Research article 21 Sep 2017

Research article | 21 Sep 2017

Comparison of large-scale dynamical variability in the extratropical stratosphere among the JRA-55 family data sets: impacts of assimilation of observational data in JRA-55 reanalysis data

Masakazu Taguchi

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Subject: Dynamics | Research Activity: Atmospheric Modelling | Altitude Range: Stratosphere | Science Focus: Physics (physical properties and processes)
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Cited articles

Andrews, D. G., Holton, J. R., and Leovy, C. B.: Middle Atmosphere Dynamics, Academic Press, San Diego, California, 1987.
Butler, A. H., Seidel, D. J., Hardiman, S. C., Butchart, N., Birner, T., and Match, A.: Defining sudden stratospheric warmings, B. Am. Meteorol. Soc., 96, 1913–1928,, 2015.
Butler, A. H., Sjoberg, J. P., Seidel, D. J., and Rosenlof, K. H.: A sudden stratospheric warming compendium, Earth Syst. Sci. Data, 9, 63–76,, 2017.
Charlton, A. J. and Polvani, L. M.: A new look at stratospheric sudden warmings. Part I: Climatology and modeling benchmarks, J. Climate, 20, 449–469,, 2007.
Fletcher, C. G. and Kushner, P. J.: The role of linear interference in the annular mode response to tropical SST forcing, J. Climate, 24, 778–794,, 2011.
Short summary
This study explores dynamical variability of the polar vortex in the stratosphere among the Japanese 55-year Reanalysis family data. Results show that the assimilation of conventional (surface and balloon) observations increases the dynamical variability as the vortex in the model is more quiescent without the assimilation. The assimilation of satellite data in addition to the conventional data strengthens and/or advances some vortex weakening events, although the impacts appear in various ways.
Final-revised paper