Abstract
Kelvin waves are one of the most dominant atmospheric waves in the tropical upper-troposphere and lower-stratosphere (UTLS). However, research related to the characteristics of Kelvin waves in the UTLS over the maritime continent is still limited. Here, we utilize long-term GPS RO measurements from January 2002 to December 2014 to study the characteristics of Kelvin waves over the maritime continent in the UTLS. The results show that the periodicity of the observed Kelvin wave over the Maritime Continent ranges from ~4–17 days and with the eastward zonal wavenumber of 1–4. The vertical wavelengths of the Kelvin wave are ranging from 2.8 to 4.9 km in the upper-troposphere, 2.8–7 km in the UTLS, and 4.9–12.1 km in the mid-stratosphere. It is also shown that the vertically propagating Kelvin wave has phase speed lines that tilt eastward with height and has a downward phase speed propagation in time. Furthermore, analysis of the Kelvin waves activity in the upper-troposphere reveals that propagation and phase speed of Kelvin waves are much slower than those in the UTLS and mid-stratosphere due to the convection. The seasonal analysis also indicates that Kelvin waves are stronger in the JJA and SON periods.
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Abbreviations
- CHAMP:
-
CHAllenging Minisatellite Payload
- C/NOFS:
-
Communications/Navigation Outage Forecasting System
- FORMOSAT-3/COSMIC:
-
FORMOsa SATellite mission-3/Constellation Observing System for Meteorology, Ionosphere, and Climate
- GRACE:
-
GRavity And Climate Experiment
- MetOp:
-
Meteorological Operational satellite
- SAC-C:
-
Satelite de Aplicaciones Cientificas-C
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Tiyas, D.A., Lubis, S.W., Setiawan, S. (2022). Kelvin Wave Activity in the UTLS Over the Maritime Continent from GPS RO Measurements. In: Yulihastin, E., Abadi, P., Sitompul, P., Harjupa, W. (eds) Proceedings of the International Conference on Radioscience, Equatorial Atmospheric Science and Environment and Humanosphere Science, 2021. Springer Proceedings in Physics, vol 275. Springer, Singapore. https://doi.org/10.1007/978-981-19-0308-3_7
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