Abstract
A 35-year ERA-Interim dataset from the European Center for Medium-Range Weather Forecasts (ECMWF) was used to study the characteristics of Kelvin waves and Mixed Rossby-gravity waves based on a Space-Time Spectral Analysis (STSA). The results show that Kelvin wave activity is stronger during easterly QBO phases, while Mixed Rossby-gravity waves are stronger during westerly QBO phases. Analysis on seasonal variations indicates that the Kelvin waves and Mixed Rossby-Gravity wave activities increase in JJA and SON, respectively. This is associated with a variation of basic mean flow in the lower stratosphere. In addition, the variations of Kelvin and Mixed Rossby-Gravity waves in the troposphere are not significantly affected by the QBO phases. In the troposphere, both Kelvin waves and Mixed Rossby-Gravity waves propagate with a lower phase speed compared to those observed in the stratosphere. This behavior is to be likely due to large.
Highlights
Equatorial Planetary Waves (EPWs) is an important class of tropical atmospheric disturbances
The focus of this study is to examine the characteristics of Kelvin and Mixed Rossby-Gravity (MRG) waves in different QBO phases, including their horizontal structures in the stratosphere and troposphere, by using the Space-Time Spectral Analysis (STSA) technique
Summary We have studied the characteristics of Kelvin waves and Mixed Rossby-gravity waves in opposite QBO phases using the ERA-Interim reanalysis dataset from 1979-2013
Summary
Equatorial Planetary Waves (EPWs) is an important class of tropical atmospheric disturbances. Two examples of prominent EPWs are Kelvin waves and Mixed Rossby-Gravity (MRG) waves. These waves are generated in the troposphere by large-scale convective system in the equator [2]. MRG waves have a period of about 4 to 5 days, and propagate westward with a vertical wavelength of about 4 - 8 km [2]. These waves play pivotal role in controlling disturbances in the equatorial stratospheric (e.g., QBO) and tropospheric circulation and precipitation [3, 4]
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