Characteristics of Kelvin waves and Mixed Rossby-Gravity waves in opposite QBO phases

3rd International Symposium on LAPAN-IPB Satellite For Food Security and Environmental Monitoring 2016

地球科学;轻工业;生态环境科学

Fathullah, Nur Zaman^1 ; Lubis, Sandro W.^2 ; Setiawan, Sonni^1

Department of Geophysics and Meteorology, Bogor Agricultural University (IPB), Indonesia^1

Physics of the Atmoshpere, GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany^2

关键词: Era interims;    European center for medium-range weather forecasts;    Kelvin waves;    Lower stratosphere;    Phase speed;    Rossby-gravity wave;    Seasonal variation;    Space time;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/54/1/012032/pdf
DOI  :  10.1088/1755-1315/54/1/012032

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

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.