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

Fathullah, Nur Zaman, Lubis, Sandro Wellyanto and Setiawan, Sonni (2017) Characteristics of Kelvin waves and Mixed Rossby-Gravity waves in opposite QBO phases. Open Access IOP Conference Series: Earth and Environmental Science, 54 (Art. Nr. 012032). DOI 10.1088/1755-1315/54/1/012032.

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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.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: No
Open Access Journal?: Yes
DOI etc.: 10.1088/1755-1315/54/1/012032
ISSN: 1755-1307
Date Deposited: 15 Feb 2017 07:02
Last Modified: 15 Feb 2017 07:02
URI: http://oceanrep.geomar.de/id/eprint/36557

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