Relationship between circulation and rainfall over India during the southwest monsoon season. Part II: 700 hPa contour height field and some synoptic indices

Inamdar, S. R.; Singh, S. V.

doi:10.1007/bf00864908

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…Owing to the influence of a rain shadow effect over the southeastern peninsula and Sri Lanka higher OLR (>220 W m −2 ) values are observed for this season. During the monsoon season the distribution of rainfall can be related directly to non‐divergent winds at 700‐hPa (Inamdar and Singh, ). Over the near equatorial northern Indian Ocean (south of 20°N) westerly winds prevail.…”

Section: Resultsmentioning

confidence: 99%

Role of MJO in modulating rainfall characteristics observed over India in all seasons utilizing TRMM

Anandh

Vissa

Broderick

2017

Intl Journal of Climatology

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The present study aims to understand the influence of the Madden–Julian oscillation (MJO) on the seasonal and diurnal characteristics (amplitude and phase) of rainfall over the Indian subcontinent (lat. 10°S–38°N, long. 60°–100°E). The study is conducted for the period 1998–2015 and for each Indian season. To accomplish this, the Tropical Rainfall Measuring Mission (TRMM) data set (3B42, version 7) is examined using indices quantifying rainfall frequency percentage and rainfall octet contribution, respectively. The real‐time multivariate (RMM) index developed by Wheeler and Hendon (2004) is used to partition the MJO into active, weak and suppressed phases. The results show that during active and weak phases (suppressed), positive (negative) rainfall anomalies are observed and the frequency of rainfall events is enhanced (lessened) over the most of the geometrically distinct regions. This finding is common to all seasons but is most prominent for weak phases (restricted to RMM phases 2–5) of the MJO during the monsoon season. Results suggest that the eastward propagation of the MJO over the Indian Ocean modulates rainfall across the India and neighbouring seas and countries – irrespective of the RMM index amplitude. Most works previously published focuses on the diurnal rainfall characteristics of the Indian summer monsoon (JJAS). The present study extends current understanding by investigating diurnal variation in rainfall related to the mean, active, weak and suppressed phases of MJO for each Indian season. Possible drivers of the diurnal cycle of rainfall over the oceans and continental regions were explored using recently reported observational and modelling studies. Our findings help understand rainfall processes for the Indian subcontinent and have practical application for numerical weather prediction, flood forecasting and water resource management regionally.

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Section: Resultsmentioning

confidence: 99%

Role of MJO in modulating rainfall characteristics observed over India in all seasons utilizing TRMM

Anandh

Vissa

Broderick

2017

Intl Journal of Climatology

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“…Lyons and Bonell (1992) created indices of rainfall activity for different synoptic circulations over Queensland, Australia, in addition to producing composite correlation field maps. Inamdar and Singh (1993) were able to utilize regression equations to demonstrate relationships between large-scale synoptic indices and 700 hPa contour heights for the Asian monsoon. Kutiel et al (1996) created circulation indices for the Mediterranean region and Europe, and linked them to rainfall conditions throughout the Mediterranean.…”

Section: Indexingmentioning

confidence: 99%

Developments and prospects in synoptic climatology

Yarnal

Comrie

Frakes

et al. 2001

Intl Journal of Climatology

262

167

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Developments in synoptic climatology in the 1990s included advances in traditional synoptic climatology, empirical downscaling, and dynamical downscaling (i.e. regional climate modelling). The research emphasis in traditional, empirical-statistical approaches to synoptic climatology shifted from methodological development to applications of widely accepted classification techniques, including manual, correlation-based, eigenvector-based, compositing and indexing schemes. In contrast, most efforts in empirical downscaling, which became a well-established field of synoptic climatology during the 1990s, were directed to model development; applications were of secondary concern. Similarly, regional climate models (RCMs) burst onto the scene during the decade and focused on model development, although important progress was made in linking or coupling RCMs to regional or local surface climate systems. This paper discusses prospects for the future of traditional synoptic climatology, empirical downscaling and regional climate modelling. It concludes by looking at the present role of geographic information system (GIS) concepts in synoptic climatology and the potential future role of GIS to the field.

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“…A high index value indicates strong zonal flow while a low index value indicates meridional flow (Haltiner & Martin 1957). Makrogiannis et al (1991) used mean monthly ZI values over the North Atlantic and Europe to characterize the flow over Europe a s predominantly meridional, while finding the flow over the Atlantic to be predominantly westerly, for the period 1873-1988. Inamdar & Singh (1993 also employed a ZI in their study of the relationship between circulation and rainfall over India during the sou.thwest monsoon season.…”

Section: Atmospheric Circulation Patterns As Described By Indicesmentioning

confidence: 99%

Tree-ring reconstructions of circulation indices

Woodhouse¹

1997

Clim. Res.

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Generalized circulation ~ndices, as descriptors of atmospheric circulation features, have been used to analyze the relationships between circulation and regional climates. Currently, data for such circulation indices are limited. Records for some indices extend back into the 19th century, but most are based on data that exist for less than 100 yr. Tree rings have been successfully used to extend records of circulation indices, most notably the Southern Oscillation Index. Researchers are continuing to improve reconstructions and to explore the potential of reconstructing other indices. In contrast to more general indices, it is possible to select and/or construct indices that describe circulation features important to a specific region. These regionally tailored circulation indices, along with more general indices that describe features also influencing the climate of a region, can be reconstructed from tree rings. Reconstructions can provide information about variability in atmospheric circulation and about the interactions between influential circulation features in past centuries. In this paper, an example of such a study is given in which a set of circulation indices, compiled for the southwestern U.S., is reconstructed from tree rings. This preliminary study demonstrates the potential value of regionally tailored circulation indices and the reconstruction of these circulation indices for gaining an understand~ng of how circulation patterns may influence regional climates, on scales of decades to centuries.

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Relationship between circulation and rainfall over India during the southwest monsoon season. Part II: 700 hPa contour height field and some synoptic indices

Cited by 3 publications

References 6 publications

Role of MJO in modulating rainfall characteristics observed over India in all seasons utilizing TRMM

Role of MJO in modulating rainfall characteristics observed over India in all seasons utilizing TRMM

Developments and prospects in synoptic climatology

Tree-ring reconstructions of circulation indices

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