Influence of moisture source and sink regions on northeast monsoon rainfall

Suneetha, P.; Latha, Peddada; Rao, S. Ramalingeswara; Kumar, O. S. R. U. Bhanu

doi:10.1002/met.1705

Cited by 5 publications

(5 citation statements)

References 21 publications

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“…Studies examining the source contributions of NE monsoon precipitation are few compared to the SW monsoon season for a meaningful comparison. In agreement with the results, a trajectory analysis 22 suggests precipitation recycling as the principal source of October precipitation, while observational studies 13 , 22 , 37 identify the Bay of Bengal as an important source of NE monsoon precipitation. The NE monsoon season has considerably reduced water vapor content and a shorter vertical extent of the water vapor profile in the Indian domain compared to the SW monsoon (Supplementary Fig.…”

Section: Resultssupporting

confidence: 80%

“…The results show that the Indian Ocean sources, Arabian Sea, and continental recycling are the major sources of SW monsoon precipitation in the Indian domain, in agreement with previous studies using Lagrangian techniques [21][22][23][24][25] . The substantial contribution of the North Pacific to the NE monsoon precipitation is important, as observations show that positive phases of El Niño-Southern Oscillation (ENSO) are favorable for stronger NE monsoon 16 , and that excess NE monsoon years are associated with more water vapor derived from the western Pacific Ocean 37 .…”

Section: Discussionmentioning

confidence: 99%

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Sources of water vapor and their effects on water isotopes in precipitation in the Indian monsoon region: a model-based assessment

Tharammal

Bala

Nusbaumer

2023

Sci Rep

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Climate records of ratios of stable water isotopes of oxygen (δ18O) are used to reconstruct the past Indian monsoon precipitation. Identifying the sources of water vapor is important in understanding the role of monsoonal circulation in the δ18O values, to aid in monsoon reconstructions. Here, using an isotope-enabled Earth system model, we estimate the contributions of oceanic and terrestrial water vapor sources to two major precipitation seasons in India—the Southwest monsoon and the Northeast monsoon, and their effects on the δ18O in precipitation (δ18Op). We find that the two monsoon seasons have different dominant sources of water vapor because of the reversal in atmospheric circulation. While Indian Ocean regions, Arabian Sea, and recycling are the major sources of the Southwest monsoon precipitation, North Pacific Ocean and recycling are two crucial sources of Northeast monsoon precipitation. The δ18Op of the Southwest monsoon precipitation is determined by contributions from the Indian Ocean sources and recycling. Despite reduced precipitation, more negative δ18Op values are simulated in the Northeast monsoon season due to larger negative δ18Op contributions from the North Pacific. Our results imply that changes in atmospheric circulation and water vapor sources in past climates can influence climate reconstructions using δ18O.

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Section: Resultssupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Sources of water vapor and their effects on water isotopes in precipitation in the Indian monsoon region: a model-based assessment

Tharammal

Bala

Nusbaumer

2023

Sci Rep

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“…The occurrence of low and medium rainfall events (0 < rainfall ≤ 124.4·mm·day −1 ) along with the events with >124.4·mm·day −1 events during monsoon season have a potential to cause large‐scale floods and considerable damage over the Indian region (Dhar and Nandargi, 1995; Kohle and De, 2003; Francis and Gadgil, 2006; Rajeevan et al ., 2012; Roxy et al ., 2017; Sagar et al ., 2017; Suneetha et al ., 2018). Understanding the role of such daily rainfall variability over the Indian region is significant for freshwater resource management, agricultural productivity planning and crop management.…”

Section: Methodsmentioning

confidence: 99%

Climatology of landfalling atmospheric Rivers and associated heavy precipitation over the Indian coastal regions

Laskhmi

Satyanarayana

2020

Intl Journal of Climatology

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The Indian coastal regions encountered frequently by extreme weather events such as heavy precipitation events (HPE). In the present study, an assessment has been made to understand the climatological relationship between atmospheric rivers (ARs) and HPEs for Indian coastal regions. For this purpose, India Meteorological Department gridded rainfall dataset, and four different reanalyses datasets for the occurrence of ARs were analysed for different seasons during 1980–2015. The influence of ARs towards the cause of HPEs was stronger over the West coast (WC) compared to the East coast of India (ECI). Over the WC the association between HPE with ARs is ~40% (for rainfall events >124.4·mm·day−1) than East coast (EC) by ~28%. The 64.4–124.4·mm·day−1 events are higher over the WC by ~18% compared to ~5% over the EC. While for the events (<64.4·mm·day−1), the percentage of occurrence is moreover the WC (~7%) compared to the EC (~2%). The study reveals that ARs is in good correlation with the occurrence of HPE. Using Poisson regression model, investigated the relationship between the AR totals in the summer and Northeast monsoon and the large‐scale climate indices. A sufficiently significant negative (positive) dependency observed between ARs and the Southern Oscillation Index (SOI) (Indian Ocean Dipole [IOD] and Niño 3.4 indices) with a larger rate of AR occurrence associated with lower SOI values and larger frequency of AR occurrence associated with larger IOD and Niño 3.4 values for both the coasts of India.

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“…Studies on the relationship between tropospheric temperature in pre-monsoon and the Indian summer monsoon rainfall has been examined (Verma, 1982;Mooley and Paolino, 1988;Parthasarathy et al, 1990;Rajeevan et al, 1998;Kothawale and Rupa Kumar, 2002). Several investigations have been carried out to establish a possible relationship between sea surface temperature (SST), fluxes variations over the Indian seas and monsoon activity over the Indian subcontinent from different experiments (Pisharoty, 1965;Shukla, 1975;Weare, 1979;Das, 1983;Mohanty et al, 1983;Rao and Goswami, 1988; Mohanty and Mohan Kumar, 1990;Bhanu Kumar et al 2012, Roxy et al 2017, Suneetha et al, 2017. The flux transfer of heat and moisture from the ocean surface and the atmosphere exhibit significant variability over the Indian seas between the extreme categories of the monsoon flood and drought Ramesh, 1993, Suneetha et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Study of Moisture Budget of Meteorological Droughts over Indian Region

Suneetha¹,

Zedek²,

Rao³

et al. 2018

MAS

Self Cite

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The study mainly focuses on heat and moisture budget components and its variations during meteorological drought conditions over India for the period 1951-2013. IITM sub-divisional summer monsoon standardized rainfall anomaly is considered to identify the meteorological drought where the standardized summer monsoon rainfall anomaly is less than one. From the analysis, there are thirteen meteorological droughts are identified, and the rainfall decreased on spatial and temporal scales with significant changes in the frequency, duration and total amount of rainfall. Mainly, anticyclonic circulation is observed along 60⁰-70⁰E with weak westerlies at lower levels. At the upper level, the intensity of easterly jet stream is decreased and shifted southward during drought years.Anomalous variations in relative humidity and vertical velocity induce the maximum reduction in the moisture amount (15%) at lower and upper levels leads to weakening of the strength of local Hadley circulation. Next, the heat budget components are decreased over Bay of Bengal and coastal regions with a magnitude of 40 to 200 W/m2 in drought years. It is observed that more moisture is transported to the equatorial region producing below average rainfall over the Indian subcontinent during weak monsoon periods. Hence, this study will help to identify the quantitative and qualitative estimation of drought conditions for long-range prediction of rainfall forecasting.

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Influence of moisture source and sink regions on northeast monsoon rainfall

Cited by 5 publications

References 21 publications

Sources of water vapor and their effects on water isotopes in precipitation in the Indian monsoon region: a model-based assessment

Sources of water vapor and their effects on water isotopes in precipitation in the Indian monsoon region: a model-based assessment

Climatology of landfalling atmospheric Rivers and associated heavy precipitation over the Indian coastal regions

Study of Moisture Budget of Meteorological Droughts over Indian Region

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