Stalagmite δ18O variations in southern India reveal divergent trends of Indian Summer Monsoon and East Asian Summer Monsoon during the last interglacial

Allu, N. C.; Tiwari, Manish; Yadava, M. G.; Dũng, Nguyễn Chí; Shen, Chuan‐Chou; Belgaonkar, Sarang P.; Ramesh, R.; Laskar, Amzad H.

doi:10.1016/j.quaint.2014.12.014

Cited by 7 publications

(6 citation statements)

References 39 publications

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“…Table 1 provides information on records published from this region, including those records not currently in the SISAL database. Orbital-scale records are available from Bittoo cave [13] from north India and Belum cave [54] from peninsular India. Mawmluh cave [16,17,46] from the northeast currently covers the Last Glacial Maximum, and Heinrich stadials.…”

Section: Spatial Distribution Of Caves and Potential For Paleoclimatementioning

confidence: 99%

“…Of these, the Panigarh [59] and Sainji [60] stalagmites show mixed calcite-aragonite mineralogy, while Mawmluh [14], Akalagavi [51], Chulerasim [55], Umsynrang [61], and Dharamjali [56] stalagmites are composed of aragonite. A few records provide δ 18 O measurements for certain time intervals, but lack age control to examine events closely, such as the Tityana [48], Akalagavi [51], Belum [54], and Baratang [51] cave records.…”

Section: Quality Of the Recordsmentioning

confidence: 99%

“…The Kotumsar δ 18 O record similarly shows that there was a gradual decrease in the amount of rainfall from 8500 to 7300 years BP followed by an increasing trend from 7300 to 5600 years BP [57]. A very limited number of records cover ISM dynamics in peninsular India during brief time windows older than the Holocene [49,50,54]. An aragonite stalagmite record from Valmiki cave indicates wetter climate during Termination 1a (~14,800 years BP) [50] and during the later phase of Heinrich event 1 [50], pending replicate measurements and verification.…”

Section: Peninsular Indiamentioning

confidence: 99%

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The Indian Summer Monsoon from a Speleothem δ18O Perspective—A Review

et al. 2018

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As one of the most prominent seasonally recurring atmospheric circulation patterns, the Asian summer monsoon (ASM) plays a vital role for the life and livelihood of about one-third of the global population. Changes in the strength and seasonality of the ASM significantly affect the ASM region, yet the drivers of change and the varied regional responses of the ASM are not well understood. In the last two decades, there were a number of studies reconstructing the ASM using stalagmite-based proxies such as oxygen isotopes (δ18O). Such reconstructions allow examination of ASM drivers and responses, increasing monsoon predictability. In this review paper, we focus on stalagmite δ18O records from India at the proximal end of the ASM region. Indian stalagmite δ18O records show well-dated, high-amplitude changes in response to the dominant drivers of the ASM on orbital to multi-centennial timescales, and indicate the magnitude of monsoon variability in response to these drivers. We examine Indian stalagmite records collated in the Speleothem Isotope Synthesis and AnaLysis version 1 (SISAL_v1) database (http://researchdata.reading.ac.uk/139/) and support the database with a summary of record quality and regional climatic interpretations of the δ18O record during different climate states. We highlight current debates and suggest the most useful time periods (climatic events) and locations for further work using tools such as data-model comparisons, spectral analysis methods, multi-proxy investigations, and monitoring.

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Section: Spatial Distribution Of Caves and Potential For Paleoclimatementioning

confidence: 99%

Section: Quality Of the Recordsmentioning

confidence: 99%

Section: Peninsular Indiamentioning

confidence: 99%

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The Indian Summer Monsoon from a Speleothem δ18O Perspective—A Review

et al. 2018

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“…Of these, the Panigarh [59] and Sainji [60] stalagmites show mixed calcite-aragonite mineralogy while Mawmluh [14], Akalagavi [51], Chulerasim [55], Umsynrang [61], and Dharamjali [56] stalagmites are composed of aragonite. A few records provide useful δ 18 O measurements for certain time intervals but lack age control to examine events closely, such as the Tityana [48], Akalagavi [51], Belum [54] and Baratang [52,52] cave records.…”

Section: Quality Of the Recordsmentioning

confidence: 99%

The Indian Summer Monsoon from a Speleothem d<sup>18</sup>O Perspective – a Review

Kaushal¹,

Breitenbach²,

Lechleitner³

et al. 2018

Preprint

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As one of the most prominent seasonally recurring atmospheric circulation patterns, the Asian Summer Monsoon (ASM) plays a vital role for the life and livelihood of about a third of the global population. Changes in the strength and seasonality of the ASM significantly affect the region, yet the drivers of change and the varied regional responses of the ASM are not well understood. In the last two decades, there have been a number of studies reconstructing the ASM using stalagmite-based proxies such as oxygen isotopes (18O). Such reconstructions allow examination of the drivers and responses, increasing monsoon predictability. In this review paper, we focus on stalagmite 18O records from India at the proximal end of the ASM region. Indian stalagmite 18O records show well dated, high amplitude changes in response to the dominant drivers of the ASM on orbital to multi-centennial timescales and indicate the magnitude of monsoon variability in response to these drivers. We examine Indian stalagmite records collated in SISAL_v1 (version 1) database (http://researchdata.reading.ac.uk/139/) and support the database with a summary of record quality and regional climatic interpretations of the 18O record during different climate states. We highlight current debates and suggest the most useful time periods (climatic events) and locations for further work using tools such as data-model comparisons, spectral analysis methods, multi-proxy investigations and monitoring work

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“…Proxy records of ISM strength from peninsular India are important as they record a signal of synoptic-scale monsoon circulation 4 and are good indicators of overall ISM strength, in addition to its core variability, across different timescales (annual to orbital variability). A few speleothem-based ISM reconstructions exist from the ISM region [5][6][7][8][9][10][11][12][13] . However, the δ 18 O signatures of these speleothem records are thought to have been derived from different moisture sources or upstream changes in the δ 18 O of precipitation in the ISM domain (rather than regional rainfall amount variability) thus complicating interpretations 14 .…”

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confidence: 99%

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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Stalagmite δ18O variations in southern India reveal divergent trends of Indian Summer Monsoon and East Asian Summer Monsoon during the last interglacial

Cited by 7 publications

References 39 publications

The Indian Summer Monsoon from a Speleothem δ18O Perspective—A Review

The Indian Summer Monsoon from a Speleothem δ18O Perspective—A Review

The Indian Summer Monsoon from a Speleothem d<sup>18</sup>O Perspective – a Review

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

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Stalagmite δ18O variations in southern India reveal divergent trends of Indian Summer Monsoon and East Asian Summer Monsoon during the last interglacial

Cited by 7 publications

References 39 publications

The Indian Summer Monsoon from a Speleothem δ18O Perspective—A Review

The Indian Summer Monsoon from a Speleothem δ18O Perspective—A Review

The Indian Summer Monsoon from a Speleothem d<sup>18</sup>O Perspective &ndash; a Review

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

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The Indian Summer Monsoon from a Speleothem d<sup>18</sup>O Perspective – a Review