モテサクの最新MJO論文がWEB公開されました。我ながら常識を打ち破る超大作。別刷りもたくさんあるのでご希望の方はメッセージを。
モテサク初の単著論文の視点は、「世界の気候を支配する
– Moteki, Q., 2015: Equatorially anti-symmetric features in the initiation processes of the Madden-Julian Oscillation observed in the late October during CINDY2011. J. Meteor. Soc. Japan, 93A, 59-79.
CINDY2011の10月下旬に観測されたMadde
茂木 耕作
要旨
本論文は、CINDY2011 (Cooperative Indian Ocean Experiment on Intraseasonal Variability in the Year 2011)の10月下旬に観測されたMJO (Madden-Julian Oscillation)事例の初期過程における赤道非
In this study, we investigated the equatorially antisymmetric features in the initiation processes of the Madden-Julian oscillation (MJO) event in late October during the cooperative Indian Ocean experiment on intraseasonal variability in the year 2011. This MJO event developed when the thermal equator was drastically shifted from the Northern Hemisphere to the equator from September to October as the Mascarene High over the southern Indian Ocean decayed and shifted southward. The large-scale fields of sea level pressure, temperature, and moisture around the MJO exhibited equatorially antisymmetric features. According to their different features in terms of surface convergence, temperature, and moisture, MJO convection over the Indian Ocean after its onset consisted of four distinct convective components: the southern intertropical convergence zone between 10°S and 0° along the meridional sea surface temperature (SST) gradients (s-ITCZ), the northern-ITCZ at the southern edge of the high SST above 29°C over the Bay of Bengal, the vortex disturbance over the Arabian Sea (VDAS) in association with the zonal SST gradients, and the westward-propagating diurnal convection originating from Sumatra. In particular, the double-ITCZ and VDAS were characterized by a steady, low-level convergence zone along the surface potential temperature gradients forced by the SST. Before the onset of the MJO convection, the double-ITCZ was characterized by cross-equatorial vertical circulation that was baroclinically tilted northward, and s-ITCZ convection was inhibited owing to the strong Mascarene High. After the onset, single, larger-scale upward motion was barotropically formed over the equator because of the equatorward shift of the double-ITCZ. Such changes in the equatorially antisymmetric meridional circulation are relevant for the organization of the MJO convection.
セミナー：インド洋海面水温前線に伴うCINDY2011中のMJO初期発達
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