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  • Ruti, P.M., V. Lucarini, A. Dell'Aquila, S. Calmanti, and A. Speranza, 2006: Does the subtropical jet catalyze the mid-latitude atmospheric regimes?. Geophys. Res. Lett., 33, L06814, doi:10.1029/2005GL024620.

Understanding the atmospheric low-frequency variability is of crucial importance in fields such as climate studies, climate change detection, and extended-range weather forecast. The Northern Hemisphere climate features the planetary waves as a relevant ingredient of the atmospheric variability. Several observations and theoretical arguments seem to support the idea that winter planetary waves indicator obey a non-gaussian statistics and may present a multimodal probability density function, thus characterizing the low-frequency portion of the climate system. We show that the upper tropospheric jet strength is a critical parameter in determining whether the planetary waves indicator exhibits a uni- or bimodal behavior, and we determine the relevant threshold value of the jet. These results are obtained by considering the data of the NCEP-NCAR and ECMWF reanalyses for the overlapping period. Our results agree with the non-linear orographic theory, which explains the statistical non-normality of the low-frequency variability of the atmosphere and its possible bimodality.

Full Article: https://unicam.it/~valerio.lucarini/Rutietal2006.pdf

Last Updated: 2007-07-26

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