The simultaneous effect of NAO and SO on the monsoon activity over India

Kakade, S. B.; Dugam, S. S.

doi:10.1029/1999gl011201

Cited by 29 publications

(26 citation statements)

References 8 publications

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“…The results of this analysis showed that the NAO index prevailing during the spring and winter months revealed a statistically inverse relationship with respect to monsoon rainfall. In another study, Kakade and Dugam (Kakade and Dugam 2000) found an overall negative correlation between the NAO index in April and AISMR. There is also evidence of a combined effect of NAO and the much-analyzed Southern Oscillation (SO) on the AISMR (Kakade and Dugam 2006).…”

Section: Introductionmentioning

confidence: 84%

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The Role of the North Atlantic Oscillation in Shaping Regional-Scale Peak Seasonal Precipitation across the Indian Subcontinent

Roy

2011

Earth Interactions

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The present study focuses on the impact of the North Atlantic Oscillation (NAO) in shaping the regional-level precipitation during the peak months of the two main rainy seasons over the Indian subcontinent. Monthly precipitation data from 1871 to 2005 were collected for 30 homogenous regions across the subcontinent. Regression analysis was used to analyze the strength of the relationship between NAO on regional-level precipitation patterns. The results of the study showed distinct spatial variations in the response of regionallevel rainfall to the monthly NAO index. There were greater variations in the strength of the regression coefficients for peak monsoon rainfall (PMR) compared to the peak winter rainfall (PWR) season. During the latter half of the year, the association between PMR and the NAO index was predominantly negative. In general, the role of NAO was more pronounced across most of the regions in the peninsular India.

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Section: Introductionmentioning

confidence: 84%

“…There were no missing data in the entire dataset. This dataset has been widely used in several recent studies that analyze precipitation patterns across the Indian subcontinent (Kakade and Dugam 2000;Naidu et al 2009). …”

Section: Data Sourcesmentioning

confidence: 99%

The Role of the North Atlantic Oscillation in Shaping Regional-Scale Peak Seasonal Precipitation across the Indian Subcontinent

Roy

2011

Earth Interactions

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“…Positive ESI indicates that the strength of the NAO is relatively more than that of the SO, which weakens the net air-flow from the southern hemisphere to the northern hemisphere. The monthly mean ESI for excess (deficient) summer monsoon years suggests positive (negative) ESI from April through September (Kakade and Dugam, 2000). ESI tendency indicates how the relative strength of the two oscillations is evolved from winter to spring.…”

Section: Resultsmentioning

confidence: 99%

“…All these studies explain how a parameter or set of parameters are physically linked with the summer monsoon rainfall activity over India. Kakade and Dugam (2000) have defined an index called Effective Strength Index (ESI) on the basis of monthly indices of North Atlantic Oscillation (NAO) and Southern Oscillation (SO). They have also shown that during excess monsoon years the ESI decreases from January to April, whereas during deficient monsoon years there is a rising tendency of ESI from January to April.…”

Section: Introductionmentioning

confidence: 99%

Relationship between ESI tendency and Indian monsoon rainfall: a possible mechanism

Kakade

Kulkarni

2011

Atmospheric Science Letters

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In this article, we have studied spatial and temporal variabilities of temperature and zonal wind field over 90 • -0 • N, 90 • W-90 • E during contrasting phases of Effective Strength Index (ESI) tendency and its relationship with Indian summer monsoon rainfall (ISMR). During positive (negative) ESI tendency, there is winter-time anomalous cooling (warming) over western Eurasia surrounding Moscow but magnitude of warming is stronger than cooling. The correlation analysis also suggests that negative ESI tendency is significantly associated with warming over western Eurasia during winter and spring seasons. The study further reveals that positive (negative) ESI tendency is indicating winter-time anomalous trough (ridge) over the Russian region surrounding Moscow.

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“…Kakade and Dugam [7][8][9] have defined the index known as Effective Strength Index (ESI) as the combined strength of North Atlantic Oscillation (NAO) and Southern Oscillation (SO) and have shown that ESI decreases from January to April during excess monsoon years and vice versa. Thus ESI-tendency from January to April is a precursor for monsoon circulation over Indian subcontinent.…”

Section: Introductionmentioning

confidence: 99%

Association between Arctic Circulation and Indian Summer Monsoon Rainfall

Kakade¹,

Kulkarni²

2017

J Climatol Weather Forecasting

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The cluster regions for different meteorological fields at lower, mid and upper troposphere are identified using Shared Nearest Neighbor (SNN) algorithm. The relationships among weather conditions over the Arctic cluster regions, Indian Summer Monsoon Rainfall (ISMR) and Arctic oscillation are studied. It is observed that Arctic oscillation and mid tropospheric zonal wind anomaly over cluster region [60°N-70°N; 5°W-55°W] are directly correlated with each other in winter season and this relationship in turn influences ISMR. During contrasting phases of ESI (Effective Strength Index) tendency, the significant inverse relationship between zonal wind anomaly over Arctic clusters and ISMR show spatial and temporal variability. During positive (negative) ESI-tendency, lower tropospheric (upper tropospheric) temperature and pressure anomalies over respective cluster regions in Arctic have relationship with ISMR.

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The simultaneous effect of NAO and SO on the monsoon activity over India

Cited by 29 publications

References 8 publications

The Role of the North Atlantic Oscillation in Shaping Regional-Scale Peak Seasonal Precipitation across the Indian Subcontinent

The Role of the North Atlantic Oscillation in Shaping Regional-Scale Peak Seasonal Precipitation across the Indian Subcontinent

Relationship between ESI tendency and Indian monsoon rainfall: a possible mechanism

Association between Arctic Circulation and Indian Summer Monsoon Rainfall

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