Variations of the SO Relationship with Summer and Winter Monsoon Rainfall over India: 1872–1993

Rao, G. Nageswara

doi:10.1175/1520-0442(1999)012<3486:votsrw>2.0.co;2

Cited by 43 publications

(21 citation statements)

References 14 publications

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“…Rao (1999) examined the winter precipitation in India with SOI and found significant negative correlations in some part of Indian continent. Yadav et al (2007) found the significant relations between northwestern India winter precipitation and SOI, suggesting a key role of sea surface temperature in the equatorial Indian Ocean.…”

Section: Previous Studies On Interannual Variabilitysupporting

confidence: 92%

Seasonal Contrast in Precipitation Mechanisms over Nepal Deduced from Relationship with the Large-Scale Climate Patterns

Sigdel

Ikeda

2013

Nepal Journal of Science and Technology

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Summer precipitation dominates over winter one for the annual total in south Asia, while the winter condition is still important for agricultural productions. Rain gauge data over Nepal were analyzed with large-scale atmospheric patterns such as El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD). In the period of June to September, summer monsoon rainfall over Nepal (SMRN) is generally higher in the eastern region along with a peak in the central region associated with the local orography. Its interannual variability was found to be correlated with the southern oscillation index (SOI): i.e., when La Niña occurs, eastward moisture flux is blocked over Bay of Bengal (BOB) by the anomalous Walker circulation extending from the Pacific. The local-scale condition for higher SMRN is implied by a main moisture route along the eastern arm of the low pressure in northeastern India, as proved by a significant correlation between SMRN and the northward moisture flux. In winter (DJFM), precipitation occurs more in the western region. The higher winter precipitation over Nepal (WPN) was correlated almost equally with positive Dipole Mode Index (DMI) over the Indian Ocean and also SOI, while the relationship with SOI is reversed from summer. A clear linkage was suggested with moisture flux from the Arabian Sea and the further western region. Thus, possible impacts of anomalous precipitation have to be predicted under the relationship with the large-scale indices depending on seasons.

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Section: Previous Studies On Interannual Variabilitysupporting

confidence: 92%

Seasonal Contrast in Precipitation Mechanisms over Nepal Deduced from Relationship with the Large-Scale Climate Patterns

Sigdel

Ikeda

2013

Nepal Journal of Science and Technology

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“…Jayanthi and Govindachari (1999) have shown that Tamilnadu received record rainfall in 1997 that happened to be one of the strongest El Nino episode where very high positive sea surface temperature (SST) anomalies continued throughout the year over equatorial Pacific. Nageshwar Rao (1999) has depicted the inverse relationship between Darwin sea level pressure during July-August and WMR. The southern oscillation index in preceding summer (March-April-May) is positively correlated with winter rainfall over southeast India (Singh and Chattopadhyaya, 1998).…”

Section: Introductionmentioning

confidence: 99%

The El Nino‐Southern Oscillation and winter precipitation extremes over India

Revadekar

Kulkarni

2007

Intl Journal of Climatology

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Daily rainfall data for the winter season October-December for the long period of 102 years 1901-2002 over southeast peninsular India have been used to study the characteristics of daily precipitation extremes. The frequency and intensity of extreme precipitation events do not show statistically significant long-term trend. The relationship of El Nino-southern oscillation index with these extremes shows that this index can be used to predict frequency and intensity of extreme precipitation events, 4-6 months in advance. However spell lengths of continuous wet/dry days are not modulated by variations in Pacific sea surface temperatures.

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“…This season is also widely known as the Northeast Monsoon (NEM), winter monsoon (Rao, 1999), or post-monsoon season, which we use in this paper (Singh and Sontakke, 1999), as it refers to a reversal of wind direction. Although differential heating and the resultant thermal circulation are responsible for both the ISM and post-monsoon seasons, the two monsoon seasons differ substantially in several respects (Wang, 2006).…”

Section: Stolbova Et Al: Network Of Extreme Precipitation Over Thmentioning

confidence: 99%

Topology and seasonal evolution of the network of extreme precipitation over the Indian subcontinent and Sri Lanka

Stolbova

Martin

Bookhagen

et al. 2014

Nonlin. Processes Geophys.

109

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Abstract. This paper employs a complex network approach to determine the topology and evolution of the network of extreme precipitation that governs the organization of extreme rainfall before, during, and after the Indian Summer Monsoon (ISM) season. We construct networks of extreme rainfall events during the ISM (June-September), post-monsoon (October-December), and pre-monsoon (March-May) periods from satellite-derived (Tropical Rainfall Measurement Mission, TRMM) and rain-gauge interpolated (Asian Precipitation Highly Resolved Observational Data Integration Towards the Evaluation of Water Resources, APHRODITE) data sets. The structure of the networks is determined by the level of synchronization of extreme rainfall events between different grid cells throughout the Indian subcontinent. Through the analysis of various complex-network metrics, we describe typical repetitive patterns in North Pakistan (NP), the Eastern Ghats (EG), and the Tibetan Plateau (TP). These patterns appear during the pre-monsoon season, evolve during the ISM, and disappear during the post-monsoon season. These are important meteorological features that need further attention and that may be useful in ISM timing and strength prediction.

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Variations of the SO Relationship with Summer and Winter Monsoon Rainfall over India: 1872–1993

Cited by 43 publications

References 14 publications

Seasonal Contrast in Precipitation Mechanisms over Nepal Deduced from Relationship with the Large-Scale Climate Patterns

Seasonal Contrast in Precipitation Mechanisms over Nepal Deduced from Relationship with the Large-Scale Climate Patterns

The El Nino‐Southern Oscillation and winter precipitation extremes over India

Topology and seasonal evolution of the network of extreme precipitation over the Indian subcontinent and Sri Lanka

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