Equatorial Waves Including the Madden–Julian Oscillation in TRMM Rainfall and OLR Data
Open Access
- 15 November 2004
- journal article
- Published by American Meteorological Society in Journal of Climate
- Vol. 17 (22), 4387-4406
- https://doi.org/10.1175/3215.1
Abstract
Four years of outgoing longwave radiation (OLR) and rainfall data from the Tropical Rainfall Measuring Mission (TRMM) are investigated to find the dominant large-scale wave modes in the Tropics. By using space– time cross-section analysis and spectral analysis, the longitudinal and latitudinal behaviors of the overall waves and the dominant waves are observed. Despite the noisy nature of precipitation data and the limited sampling by the TRMM satellite, pronounced peaks are found for Kelvin waves, n = 1 equatorial Rossby waves (ER), and mixed Rossby–gravity waves (MRG). Madden–Julian oscillation (MJO) and tropical depression (TD)-type disturbances are also detected. The seasonal evolution of these waves is investigated. An appendix includes a study of sampling and aliasing errors due to the peculiar space–time sampling pattern of TRMM. It is shown that the waves detected in this study are not artifacts of these sampling features. The results presented here are compared with previous studies. Consistency with their results gives confidence in the TRMM data for wave studies. The results from this study can be utilized for modeling and testing theories. Also, it may be useful for the future users of the TRMM data to understand the nature of the TRMM satellite sampling.Keywords
This publication has 48 references indexed in Scilit:
- Validation of the Space–Time Variability of African Easterly Waves Simulated by the CNRM GCMJournal of Climate, 1999
- The TRMM ‘Day-1’ Radar/Radiometer Combined Rain-Profiling AlgorithmJournal of the Meteorological Society of Japan. Ser. II, 1997
- Intraseasonal Variability in Tropical Mean Temperature and Precipitation and Their Relation to the Tropical 40–50 Day OscillationJournal of the Atmospheric Sciences, 1996
- Intraseasonal Oscillations in the Global Atmosphere. Part I: Northern Hemisphere and TropicsJournal of the Atmospheric Sciences, 1991
- The 1985/86 Intraseasonal Oscillation and the Role of the ExtratropicsJournal of the Atmospheric Sciences, 1990
- Estimating Climatic-Scale Precipitation from Space: A ReviewJournal of Climate, 1989
- Seasonal Variability of the 40–50 Day Oscillation in Wind and Rainfall in the TropicsJournal of the Atmospheric Sciences, 1988
- Space-Time Spectral Analysis and its Applications to Atmospheric WavesJournal of the Meteorological Society of Japan. Ser. II, 1982
- On the Coherence between Progressive and Retrogressive Waves and a Partition of Space-Time Power Spectra into Standing and Traveling PartsJournal of Applied Meteorology, 1977
- A Generalized Method of Resolving Disturbances into Progressive and Retrogressive Waves by Space Fourier and Time Cross-Spectral AnalysesJournal of the Meteorological Society of Japan. Ser. II, 1971