Modulation of Indian summer monsoon through northern and southern hemispheric extra-tropical oscillations

Viswambharan, Nithin; Mohanakumar, K.

doi:10.1007/s00382-014-2049-0

Cited by 7 publications

(5 citation statements)

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“…This link has received comparatively little attention so far, and the underlying dynamical mechanisms are debated. Among the few existing studies, statistically significant inverse interannual correlations were identified between the previous winter NAO and All-India summer monsoon rainfall and upper-level circulation (Dugam et al 1997;Yang et al 2004), as well as between April NAO and peak summer precipitation anomalies over India (Viswambharan and Mohanakumar 2014). Despite the strong heterogeneity at sub-regional scale (Roy 2011), the correlation pattern tends to feature rainfall anomalies of opposite sign between Pakistan and northeastern India (Syed et al 2012).…”

Section: Discussion and Dynamical Interpretationmentioning

confidence: 99%

On the link between the subseasonal evolution of the North Atlantic Oscillation and East Asian climate

Bollasina

Messori

2018

Clim Dyn

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We analyse the impact of the North Atlantic Oscillation (NAO) on the climate of East Asia at subseasonal time scales during both winter and summer. These teleconections have mainly been investigated at seasonal and longer time scales, while higher-frequency links are largely unexplored. The NAO is defined using extended empirical orthogonal functions on pentad-mean observations, which allows to elucidate the oscillation's spatial and temporal evolution and clearly separate the development and decay phases. The downstream dynamical imprint and associated temperature and precipitation anomalies are quantified by means of a linear regression analysis. It is shown that the NAO generates a significant climate response over East Asia during both the dry and wet seasons, whose spatial pattern is highly dependent on the phase of the NAO's life cycle. Temperature and precipitation anomalies develop concurrently with the NAO mature phase, and reach maximum amplitude 5-10 days later. These are shown to be systematically related to mid and high-latitude teleconnections across the Eurasian continent via eastward-propagating quasi-stationary Rossby waves instigated over the Atlantic and terminating in the northeastern Pacific. These findings underscore the importance of rapidly evolving dynamical processes in governing the NAO's downstream impacts and teleconnections with East Asia.

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Section: Discussion and Dynamical Interpretationmentioning

confidence: 99%

On the link between the subseasonal evolution of the North Atlantic Oscillation and East Asian climate

Bollasina

Messori

2018

Clim Dyn

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Section: Discussionmentioning

confidence: 99%

“…In addition to the above mechanisms, the SAM, which is also related to frontal shifts, is observed to affect the strength of the ISM 22,23 . Viswambharan and Mohankumar, 2013 22,23 observed significant negative correlations between June SAMI and July-August rainfall. The authors found that SST warming in the Southern Hemisphere was concurrent with cooling over the Arabian sea which eventually weakened the meridional temperature gradient.…”

Section: Discussionmentioning

confidence: 99%

“…ISM is strongly linked to several ocean-atmospheric processes operating on various timescales. On interannual to decadal timescale ISM intensity is influenced by El Niño-Southern Oscillation (ENSO) in the Equatorial Pacific [16][17][18] , Indian Ocean Dipole 19,20 , Northern Atlantic Oscillations 21 , and the Southern Annular Mode (SAM) 22,23 . On longer timescales, ISM is modulated by variations in orbital parameters 24 .…”

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confidence: 99%

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Southern hemisphere forced millennial scale Indian summer monsoon variability during the late Pleistocene

Band

Yadava

Kaushal

et al. 2022

Sci Rep

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Peninsular India hosts the initial rain-down of the Indian Summer Monsoon (ISM) after which winds travel further east inwards into Asia. Stalagmite oxygen isotope composition from this region, such as those from Belum Cave, preserve the vital signals of the past ISM variability. These archives experience a single wet season with a single dominant moisture source annually. Here we present high-resolution δ18O, δ13C and trace element (Mg/Ca, Sr/Ca, Ba/Ca, Mn/Ca) time series from a Belum Cave stalagmite spanning glacial MIS-6 (from ~ 183 to ~ 175 kyr) and interglacial substages MIS-5c-5a (~ 104 kyr to ~ 82 kyr). With most paleomonsoon reconstructions reporting coherent evolution of northern hemisphere summer insolation and ISM variability on orbital timescale, we focus on understanding the mechanisms behind millennial scale variability. Finding that the two are decoupled over millennial timescales, we address the role of the Southern Hemisphere processes in modulating monsoon strength as a part of the Hadley circulation. We identify several strong and weak episodes of ISM intensity during 104–82 kyr. Some of the weak episodes correspond to warming in the southern hemisphere associated with weak cross-equatorial winds. We show that during the MIS-5 substages, ISM strength gradually declined with millennial scale variability linked to Southern Hemisphere temperature changes which in turn modulate the strength of the Mascarene High.

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“…The role of climatic circulations in shaping regional hydrology is ever evolving (Abram et al 2007, Cai andVanrensch 2012), as is evident from the weakening of the ENSO-ISMR relationship over the years (Krishna Kumar 1999, Viswambharan andMohanakumar 2014). Further, it is argued that the anomalies in circulation are themselves not the causes of hydrological extremes, rather they are the manifestations of a more complicated forcing mechanism (Shelton 2009).…”

Section: Introductionmentioning

confidence: 99%

Uncovering global climate fields causing local precipitation extremes

Chanda

Maity

2016

Hydrological Sciences Journal

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Earlier studies have focused on establishing the hydroclimatic teleconnection between hydrological extremes and a single or a few preselected coupled oceanic-atmospheric circulation patterns (OACP). In this study, we hypothesise that local (continental-scale) hydrological extremes are, in general, influenced by a concurrent effect of different climate variables from several regions across the globe. The suite of these variables is termed the global climate pattern (GCP) behind the target hydrological event. To explore our hypothesis, we considered monthly Indian rainfall, which is a complex, continental-scale hydrological phenomenon. Extreme events are identified through the standardized precipitation anomaly index (SPAI), used as an indicator of dry and wet events. The global fields of different climate variables-sea surface temperature (SST), surface pressure (SP), air temperature (AT), wind speed (WS) and total precipitable water (TPW)-are explored for possible revelatory patterns. In all, 15 different variables, each designated by a climate anomaly from a distinct zone on the globe, are found to form a potential global climate signal pool, which can be designated as the GCP for Indian rainfall. The combined information extracted from this GCP is proven to be highly efficient in predicting dry and wet events in Indian rainfall.

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Modulation of Indian summer monsoon through northern and southern hemispheric extra-tropical oscillations

Cited by 7 publications

References 50 publications

On the link between the subseasonal evolution of the North Atlantic Oscillation and East Asian climate

On the link between the subseasonal evolution of the North Atlantic Oscillation and East Asian climate

Southern hemisphere forced millennial scale Indian summer monsoon variability during the late Pleistocene

Uncovering global climate fields causing local precipitation extremes

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