NDLI: Structures and mechanisms of the first-branch northward-propagating intraseasonal oscillation over the tropical Indian Ocean

Content Provider	Springer Nature Link
Author	Li, Kuiping Yu, Weidong Li, Tim Murty, V. S. N. Khokiattiwong, Somkiat Adi, T. R. Budi, S.
Copyright Year	2012
Abstract	The first-branch northward-propagating intraseasonal oscillation (FNISO) over the tropical Indian Ocean (IO) often triggers the onset of the Asian summer monsoon. In this study we investigate the structures and mechanisms associated with FNISO through the diagnosis of ERA-Interim reanalysis data for the period of 1990–2009. A composite analysis is conducted to reveal the structure and evolution characteristics of the FNISO and associated background circulation changes. It is found that the FNISO convection originates from the southwestern IO and propagates eastward. After reaching the eastern IO, the major convective branch moves northward toward the northern Bay of Bengal (BoB). Two possible mechanisms may contribute to the northward propagation of the FNISO. One is the meridional asymmetry of the background convective instability. A greater background convective instability over the northern BoB may destabilize Rossby waves and cause convection to shift northward. The other is the meridional phase leading of perturbation humidity in the planetary boundary layer (PBL). Maximum PBL moisture appears to the north of the convection center, which promotes a convectively unstable stratification ahead of the convection and leads to the northward propagation of the FNISO. A PBL moisture budget analysis reveals that anomalous zonal advection is a dominant process in contributing to the moisture asymmetry.
Starting Page	1707
Ending Page	1720
Page Count	14
File Format	PDF
ISSN	09307575
Journal	Climate Dynamics
Volume Number	40
Issue Number	7-8
e-ISSN	14320894
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-08-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Intraseasonal oscillation Northward propagation Monsoon onset Geophysics/Geodesy Climatology Oceanography
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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