M. Fujiwara, J. Suzuki, A. Gettelman, M. I. Hegglin, H. Akiyoshi,
and K. Shibata
Wave activity in the tropical tropopause layer
in 9 reanalysis data sets
Sub-seasonal variability including equatorial waves significantly
influences the dehydration and transport processes in the tropical
tropopause layer (TTL). This study investigates the activity of
equatorial Kelvin waves, mixed-Rossby gravity waves, and MJO
in the TTL in 9 reanalysis (RA) data sets and 4 chemistry
climatemodels (CCMs) using the zonal wavenumber-frequency
spectral analysis method. It is found that the TTL wave
activities show significant difference among the RAs,
ranging from 0.7 to 1.4 with respect to the averages from the RAs.
The TTL activities in the CCMs lie generally within the range
of those in the RAs, with some exceptions.
The broad range of wave activity found in the different RAs
decreases our confidence in their validity.
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