North-Eastward propagating 25–50-day mode and its link with Indian summer monsoon activity

Ouergli, A.; Félice, P. de

doi:10.1007/bf01025701

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…The third group is characterized by eastward movement with a northward migration over the Indian and/ or the western Pacific Ocean from May to October. Observational studies have identified this northward movement of deep convection in the Indian Ocean and western North Pacific during the boreal summer (e.g., Yasunari 1979Yasunari , 1980Yasunari , 1981Krishnamurti et al 1985;Chen and Murakami 1988;Gadgil and Srinivasan 1990;Ouergli and De Felice 1996). In the Indian Ocean, convection originates near the equator and moves northward with a speed of about 0.75°latitude day Ϫ1 (Krishnamurti and Subrahmanyam 1982).…”

Section: Introductionmentioning

confidence: 96%

Mechanism of the Northward-Propagating Intraseasonal Oscillation: Insights from a Zonally Symmetric Model*

Drbohlav

Wang

2005

Journal of Climate

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The propagation and initiation mechanisms of the boreal summer intraseasonal oscillation (BSISO) in the south Asian summer monsoon are examined with a zonally symmetric atmospheric model. In the axially symmetric model the effects of zonally propagating atmospheric waves are intentionally excluded. The model specifies mean flows and depicts the lowest baroclinic mode and a barotropic mode in the free troposphere. The two vertical modes are coupled by the time-mean vertical wind shear. The model atmosphere produces a 15–20-day oscillation, which is characterized by northward propagation of convection from south of the equator to the Indian monsoon trough region and a reinitiation of convection in the region between 10°S and the equator. The northward propagation in the model is produced by the free troposphere barotropic divergence, which leads convection by about a quarter of a cycle. The vertical advection of summer-mean easterly vertical wind shear by perturbation vertical motion inside the convective region induces barotropic divergence (convergence) to the north (south) of convection. This barotropic divergence triggers the moisture convergence in the boundary layer to the north of convection, causing the northward propagation of precipitation. The development of convection in the Southern Hemisphere near the equator is also produced by the development of the barotropic divergence in the free troposphere. When the BSISO convection is located in the Indian monsoon trough region, it creates Hadley-type anomalous circulation. This Hadley-type circulation interacts with the monsoon flow through the meridional and vertical advections creating anomalous barotropic divergence and boundary layer convergence.

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Section: Introductionmentioning

confidence: 96%

Mechanism of the Northward-Propagating Intraseasonal Oscillation: Insights from a Zonally Symmetric Model*

Drbohlav

Wang

2005

Journal of Climate

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Wavelet transform technique to study the behavior of the 10–20-day and 25–50-day modes during indian summer monsoon onset

Ouergli

Félice

1997

Meteorl. Atmos. Phys.

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Low frequency modes and their link with summer monsoon activity described by wavelet analysis throughout India

Ouergli

2000

IEEE Trans. Geosci. Remote Sensing

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North-Eastward propagating 25–50-day mode and its link with Indian summer monsoon activity

Cited by 3 publications

References 25 publications

Mechanism of the Northward-Propagating Intraseasonal Oscillation: Insights from a Zonally Symmetric Model*

Mechanism of the Northward-Propagating Intraseasonal Oscillation: Insights from a Zonally Symmetric Model*

Wavelet transform technique to study the behavior of the 10–20-day and 25–50-day modes during indian summer monsoon onset

Low frequency modes and their link with summer monsoon activity described by wavelet analysis throughout India

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