Stratigraphic and Radiocarbon Evidence for the Age and Development of Three Salt Lake Deposits in Rajasthan, India

Singh, Gurdip; Joshi, Rajesh; Singh, A. B.

doi:10.1016/0033-5894(72)90088-9

Cited by 150 publications

(68 citation statements)

References 5 publications

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“…In early Holocene time, not only were lakes widespread in northern India where desert conditions now prevail [e.g., Bryson and Swain, 1981;Enzel et al, 1999;Prasad and Enzel, 2006;Prasad et al, 1997;Singh et al, 1972Singh et al, , 1990Sinha et al, 2004], but winds associated with the Somali Jet seem to have been stronger [e.g., Gupta et al, 2003]. By contrast, before~10 Ma, winds associated with the Somali Jet seem to have been weaker than today, and some have inferred that the monsoon strengthened since that time [e.g., Harrison et al, 1992;Kroon et al, 1991;Molnar et al, 1993;Prell and Kutzbach, 1992].…”

Section: Discussion: Possible Relevance To Paleoclimatementioning

confidence: 99%

Signatures of Tibetan Plateau heating on Indian summer monsoon rainfall variability

Rajagopalan

Molnár

2013

JGR Atmospheres

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[1] Despite recent challenges, conventional wisdom has held that heating over the Tibetan Plateau leads to increased Indian summer monsoon rainfall via enhancement of cross-equatorial circulation aloft, and a concurrent strengthening of both the Somali Jet and westerly winds that bring moisture to southern India. We show that such heating, quantified by monthly estimates of moist static energy in the atmosphere just above the surface, correlates with summer monsoon rainfall, but only in the early (20 May to 15 June) and late (September 1 to 15 October) monsoon season. Correlations during the main monsoon season (15 June to 31 August) are small and insignificant. The positive correlations with early and late monsoon season, however, allow for heating over Tibet to modulate as much as 30% of the total rainfall. Furthermore, we demonstrate that heating over Tibet is independent of the El Niño Southern Oscillation, so that together they explain a substantial portion of variability in the early and late season rainfall, providing potential predictability. These links may also explain the wet conditions over India during early Holocene time and provide a quantitative link between a rise of Tibet and stronger Somali Jet.

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Section: Discussion: Possible Relevance To Paleoclimatementioning

confidence: 99%

Signatures of Tibetan Plateau heating on Indian summer monsoon rainfall variability

Rajagopalan

Molnár

2013

JGR Atmospheres

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“…The period broadly corresponds to a general rise in the lake levels in southeastern Australia and other parts of the world dating from about 10 000 B.P. (Singh 1971;Singh et al 1972Singh et al , 1974Bowler& Hamada 1971;Dodson 1974aDodson , 1974b. 2.…”

Section: Discussionmentioning

confidence: 99%

“…Until recently, it was generally held by most palynologists that the rate of success in pollen analysis was directly proportional to the degree of richness of organic content in the sediments worked on. But, recent studies have proved that salt lakes can be an effective source of palaeoecological information from the fossil pollen preserved in their sediments (Singh 1971;Singh et al 1972Singh et al , 1974. It was therefore appropriate that similar methods should be tried on the Australian continent.…”

Section: Introductionmentioning

confidence: 99%

29. Late Quaternary pollen records and seasonal palaeoclimates of Lake Frome, South Australia

Singh

1981

Hydrobiologia

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“…The effects of these orbital insolation variations on the intensity of the summer monsoon has been studied from both paleoclimatic and general circulation model (GCM) perspectives (Singh et al, 1972;McClure, 1976;Kutzbach, 1981;Van Campo et al, 1982;Swain et al, 1983;Prell, 1984;StreetPerrott and Harrison, 1984;Pokras and Mix, 1985;Prell and Van Campo, 1986;Clemens and Prell, in press). …”

Section: Late Pleistocene Variability Of the Summer Monsoonmentioning

confidence: 99%

A Rock-Magnetic Record of Monsoonal Dust Deposition to the Arabian Sea: Evidence for a Shift in the Mode of Deposition at 2.4 Ma

Menocal¹,

Bloemendal²,

King³

1991

Proceedings of the Ocean Drilling Program, 117 Scientific Results

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A detailed record of eolian deposition from the Asian monsoon has been determined from measurements of magnetic susceptibility at Sites 721 and 722 located on an elevated ridge in the western Arabian Sea. Susceptibility was measured at 5-cm intervals (1 k.y.) on whole-core sections (15,000 measurements) and these data were used to construct complete composite records extending to 3.2 Ma. The composite records at Sites 721 and 722 are virtually identical, suggesting that both are complete and without local hiatuses. Bulk X-ray diffraction analyses indicate that (eolian) quartz and dolomite abundances are strongly covariant with the susceptibility data {r = 0.83, 0.70; « = 172). An almost perfect correlation (r = 0.98; n = 94) between susceptibility and terrigenous percent (determined by sequential carbonate, opal, and organic carbon extraction) indicates that susceptibility is a rapid and sensitive tracer of terrigenous fraction variations. Furthermore, terrigenous and biogenic flux calculations indicate that the observed susceptibility variations are indeed the result of terrigenous accumulation rate variations and not dilution by variations in biogenic input.In the frequency-domain, variance is concentrated at orbital periodicities for the entire 3.2 Ma sequence; however, there is a shift in the dominant periodicity at ca. 2.4 Ma. From 3.2 to 2.4 Ma, the susceptibility data vary almost purely at 23-19 k.y. periodicities and coherency with the precessional insolation forcing is high (0.89). Strong and coherent variance at the 23-19 k.y. band is maintained after 2.4 Ma but there is a dramatic increase in variance at the 41 k.y. periodicity corresponding to orbital obliquity. The timing of this shift coincides with the initiation of Northern Hemisphere glaciation and suggests a linkage between high-and low-latitude climate processes. General circulation model experiments and paleoclimatological evidence from northeast Africa suggest that the increase in 41 k.y. power after 2.4 Ma may be reflecting periodic increases in monsoon dust source area aridity due to the coeval expansion of the Eurasian and/or North American ice sheets, which varied predominantly at this periodicity.

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Stratigraphic and Radiocarbon Evidence for the Age and Development of Three Salt Lake Deposits in Rajasthan, India

Cited by 150 publications

References 5 publications

Signatures of Tibetan Plateau heating on Indian summer monsoon rainfall variability

Signatures of Tibetan Plateau heating on Indian summer monsoon rainfall variability

29. Late Quaternary pollen records and seasonal palaeoclimates of Lake Frome, South Australia

A Rock-Magnetic Record of Monsoonal Dust Deposition to the Arabian Sea: Evidence for a Shift in the Mode of Deposition at 2.4 Ma

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