Impact of Madden Julian Oscillation on the diurnal cycle of precipitation over the west coast of India

Prajwal, K; Kottayil, Ajil; Xavier, Prince

doi:10.1016/j.atmosres.2022.106343

Cited by 7 publications

(2 citation statements)

References 62 publications

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“…Some other studies concluded that MJOs have an impact on ISO (Gadgil & Guruprasad, 1992;Krishnamurthy & Shukla, 2008;Lau & Chan, 1986;Pai et al, 2011;Prajwal et al, 2022;Rui & Wang, 1990;Seetharam, 2008;Singh & Bhatla, 2019;Yasunari, 1979Yasunari, , 1980. Further, the quasi-biweekly oscillation (QBWO), which has been shown by many studies, is another wellknown phenomenon that influences the monsoon and regulates its active and break phases (Chen & Chen, 1993;Krishnamurti & Ardanuy, 1980).…”

Section: Introductionmentioning

confidence: 99%

High‐intensity rainfall over northeast India: Spatial pattern, short‐term fluctuations and associated multiscale oscillations

Das,

Mohapatra,

Sahoo

et al. 2024

Intl Journal of Climatology

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Northeast India (NEI) receives most of its rainfall in the southwest monsoon (SWM) season. The region is known to have frequent and persistent rainfall events of high intensities and the region is vulnerable to potential high‐impact meteorological events. This study analyses observed daily rainfall data for the SWM months (JJAS) during 1991–2020 to better understand the climatology of high‐intensity rainfall (HIR) occurrences and their persistence. The agglomerative hierarchical cluster analysis has delineated four distinct clusters and Cramer's t test indicates no significant fluctuations at 5% significant level in the HIR events in these clusters. ERA‐5 reanalysis data have been used to find the moisture transport for synoptic‐scale (3–7 days), quasi‐bi‐weekly oscillations (10–20 days) and intraseasonal oscillations (30–60 days) for each cluster. Under positive synoptic‐scale phases, HIR in the clusters on southern latitudes of NEI occurs due to moisture incursion from the Bay of Bengal from southwesterlies at 850 hPa, and in the clusters on the northern latitudes, it is primarily due to westerlies. For, quasi‐bi‐weekly oscillations, westerlies at 850 hPa are favourable for moisture transport in most of the clusters during its positive phase. On the other hand, for positive phase of intraseasonal oscillations, westerlies at 850 hPa dominate the moisture transport in all the clusters. Also, most of the HIR events occur whenever Madden–Julian Oscillation (MJO) is in phase 1 and 2 with higher amplitude (RMM ≥1).

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Section: Introductionmentioning

confidence: 99%

High‐intensity rainfall over northeast India: Spatial pattern, short‐term fluctuations and associated multiscale oscillations

Das,

Mohapatra,

Sahoo

et al. 2024

Intl Journal of Climatology

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“…IMD follows a new definition of DOM by considering rainfall, OLR and wind circulation since 2009 (Pai and Nair 2009). A recent work has shown that there is a strong impact of MJO on the diurnal cycle of rainfall in the west coast of India (Prajwal et al 2022). The impact of MJO concurrently with the cyclogenesis during the summer also triggers the onset of the Indian monsoon (Baburaj et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Dynamical influence of MJO phases on the onset of Indian monsoon

Lenka

Gouda

Devi

et al. 2023

Environ. Res. Commun.

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There is a need to understand the onset of monsoon dynamics as the date of onset of monsoon (DOM) is an important parameter in framing all the policy for the imminent season like crop choice, sowing schedule, disaster management, power distribution etc. It is observed that the interannual variability of the DOM in India is about 7-8 days, making it more challenge to predict this at long lead. The MJO phases are linked with the different convection centres and hence, influences the global circulation process and the rainfall. In this paper the dynamical influence of the different phases of MJO are being quantified on DOM and its progress in continental India by using the multi-source atmospheric and oceanic parameters like wind structure, outgoing longwave radiation (OLR), sea surface temperature (SST). The linkage of the active and inactive phases of MJO along with the favourable conditions for DOM is obtained by using the pentad analysis of associated parameters in different clusters for both the wet and dry phases of MJO along with the strength for the period 1980-2018. Also the dynamics are studied for the early, normal and late onset years separately to understand the relation better. It is inferred that the wet (dry) phase leads to early (late) monsoon onset over Kerala (MOK) in India. To address the progress of monsoon the DOM in Rajasthan (MOR) is considered and the rainfall anomalies during MOK-MOR period are linked to the MJO phases. It is inferred that the wet MJO phase with negative OLR anomaly triggers the fast progress of monsoon over India. This understanding will surely help operational researchers and the NWP modellers for improving the methodologies for the advanced and accurate prediction of DOM.

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A new insight into monsoon intraseasonal variability as revealed from distinct wind-precipitation regimes over the southwest coast of India

Prajwal,

Kottayil,

Xavier

et al. 2024

Clim Dyn

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Impact of Madden Julian Oscillation on the diurnal cycle of precipitation over the west coast of India

Cited by 7 publications

References 62 publications

High‐intensity rainfall over northeast India: Spatial pattern, short‐term fluctuations and associated multiscale oscillations

High‐intensity rainfall over northeast India: Spatial pattern, short‐term fluctuations and associated multiscale oscillations

Dynamical influence of MJO phases on the onset of Indian monsoon

A new insight into monsoon intraseasonal variability as revealed from distinct wind-precipitation regimes over the southwest coast of India

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