TBB-REVEALED ANNUAL CYCLE FEATURES OF TROPICAL LFO* |
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Authors: | Zhi Xiefei Chen Xuhong and Tian Hua |
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Institution: | Nanjing Institute of Meteorology, Nanjing 210044;Nanjing Institute of Meteorology, Nanjing 210044;Nanjing Institute of Meteorology, Nanjing 210044 |
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Abstract: | In the context of 1980-1992 JMA(Japan Meteorological Agency) GMS TBB gridded dataset,study is undertaken of annual cycle features of FFT-derived window power spectrum averaged over the record length,with localized space/time characteristics of low-frequency oscillation(LFO) in the tropical atmosphere investigated alongside possible causes.It turns out that the LFO takes on surprisingly noticeable annual cycle features marked by a wider variable range of the LFO periods over northern tropics than the southern counterpart and equatorial vicinity.In addition,on the whole,the signals are more intense in the Northern Hemisphere during summer/autumn and at equatorial/southern latitudes when northern winter/spring occur as well.Also,not all these features are identical for different segments at the same latitudes,displaying signatures on a local basis,and the spatial/temporal locality can be qualitatively interpreted in terms of nonlinear interaction between tropical waves,and modulation of diabatic heating on the LFO periods. |
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Keywords: | TBB(cloud-top blackbody radiation temperature) low frequency oscillaton (LFO) annual cycle feature |
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