[A-CG30] 熱帯におけるマルチスケール大気海洋相互作用

[ACG30-12] Investigation of interannual variability in the tropical Indian Ocean based on the transfer routes of wave energy

*李 梓萌¹、相木 秀則² (1.名古屋大学大学院環境学研究科、2.名古屋大学宇宙地球研究所)

キーワード： インド洋、経年変動、波エネルギー、ケルビン波、ロスビー波

We have performed a set of 61-year hindcast experiments of Indian Ocean using monthly wind forcing and provide a new perspective for the interannual variability in the tropical Indian Ocean based on the transfer routes of wave energy using a new diagnostic scheme. There are two sets of Rossby waves along the equator during 1994 IOD positive event. One is the same phase speed with theoretical phase speed of equatorial Rossby waves, the other is slightly slower than theoretical phase speed of equatorial Rossby waves. First set is the boundary-reflected equatorial Rossby waves at eastern boundary from the equatorial Kelvin waves. Second set is the off-equatorial Rossby waves generated by southeasterly winds from the southeastern Indian Ocean, which may account for the appearance of slightly slower phase speed of Rossby wave along the equator.