Interactions of large-scale tropical motion systems during the 1996-1997 Australian monsoon
Taylor, Sylvia C.
Harr, Patrick A.
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During the northern winter monsoon, several large-scale tropical motion systems are active in the southern tropical region of the ITCZ and SPCZ, including the maritime continent, northern Australia and the West Pacific. Superimposed on the mean state are transient large-scale systems including the Madden-Julian Oscillation (MJO) propagating from the equatorial Indian Ocean, the northeasterly cold surges from the northern hemisphere, and the easterly waves from the central or western Pacific. This work studied the possible interactions among these large-scale systems and their roles in the development of tropical cyclones. GMS water vapor data and NCEP reanalysis data during December 1996 to March 1997 were used. Examination of daily maps revealed that most of the TC development requires the interaction of two or more large-scale transient systems. The most frequent occurrences involved the interaction of the MJO and cold surges, followed by the interaction of the MJO and easterly waves.
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