Lateglacial and Holocene environmental changes in Ganga plain, Northern India

Sharma, Shikha; Joachimski, Michael M.; Sharma, Maneesh; Tobschall, H. J.; Singh, Indra Bir; Sharma, Chaitanya; Chauhan, Mamta; Morgenroth, Gerhard

doi:10.1016/j.quascirev.2003.10.005

Cited by 132 publications

(54 citation statements)

References 50 publications

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“…3). An increase in continental wetness has also been reported from lake records across the Sahel region of Africa (van Campo et al 1982;Lamb et al 1995;Gasse and Roberts 2005) and northwestern India (Morrill et al 2003;Sharma et al 2004;Sinha et al 2005), and soil formation in China (Porter and An 1995;Han et al 2010). The Arabian Sea biological productivity did not reach its Holocene maximum until after 9.2 ka (Schulz et al 1998) suggesting an enigmatically weaker upwelling interval between 11.6 and 9.2 ka.…”

Section: The Bay Of Bengal Monsoon and The Regional Climate Connectionsmentioning

confidence: 61%

“…A shift toward an arid phase at 4.2 ka was also found in the vegetation history from the lake records of Rajasthan. Desiccation of river channels in the Gangetic plain (Sharma et al 2004) and reduction in Cambodian lake levels (Maxwell 2001) also occurred between 5 and 4 ka. Thus, it appears that the abrupt dry event at ~4.2 ka ushered the step-wise weakening of the Asian monsoon.…”

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confidence: 99%

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Late Glacial to Holocene Indian Summer Monsoon Variability Based upon Sediment Records Taken from the Bay of Bengal

Rashid¹,

England²,

Thompson³

et al. 2011

Terr. Atmos. Ocean. Sci.

145

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Paleoclimatic records from the Bay of Bengal are rare. We reconstruct the sea-surface temperature (SST) 18 O sw values suggest that the monsoon was stronger and wetter resulting in a humid climate. After ~5 ka the Indian summer monsoon weakened significantly, indicating less dilution of the sea surface by the Ganges-Brahmaputra-Meghna outflow and/or less direct rainfall. We hypothesize that the prevailing late Holocene dry climate may have caused the diminishment and subsequent abandonment of the settlements of the great Indus Valley Civilizations. Our Bay of Bengal climate records are consistent with those from the Andaman Sea, corroborating broad regional changes in the Indian summer monsoon during the last 25 ka. The general pattern and timing of monsoon variability in the Bay of Bengal and Andaman Sea seems to parallel the Arabian Sea, Africa, and Asian ice cores and speleothem records suggesting that a common tropical forcing may have induced these abrupt climate changes.

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Section: The Bay Of Bengal Monsoon and The Regional Climate Connectionsmentioning

confidence: 61%

mentioning

confidence: 99%

Late Glacial to Holocene Indian Summer Monsoon Variability Based upon Sediment Records Taken from the Bay of Bengal

Rashid¹,

England²,

Thompson³

et al. 2011

Terr. Atmos. Ocean. Sci.

145

View full text Add to dashboard Cite

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“…The cold stages are characterized by high abundances of total organic carbon (Melles et al, , 2012, LOI (Fig. 6), and a higher clay content, suggesting that Cr and Ni might be absorbed by either organic matter (e.g., Sharma et al, 2004) or clay minerals (e.g., Das and Haake, 2003;Pistolato et al, 2006). Geochemical analysis of surface sediments from the lake indicates that the main source of Cr and Ni is linked to weathering products of basalts and andesite basalts found along the southern shore of Lake El'gygytgyn (Wennrich et al, 2013a).…”

Section: Cr Nimentioning

confidence: 99%

Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11

Minyuk¹,

Borkhodoev²,

Wennrich

2014

Clim. Past

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Abstract. Geochemical analyses were performed on sediments recovered by deep drilling at Lake El'gygytgyn in central Chukotka, northeastern Russia (67 • 30 N; 172 • 05 E). Major and rare element concentrations were determined using X-ray fluorescence spectroscopy (XRF) on the < 250 µm fraction from 617 samples dated to ca. 440 and 125 ka, which approximates marine isotope stages (MIS) 11 to 6. The inorganic geochemistry indicates significant variations in elemental composition between glaciations and interglaciations. Interglacial sediments are characterized by high contents of SiO 2 , Na 2 O, CaO, K 2 O, and Sr and are depleted in Al 2 O 3 , Fe 2 O 3 , TiO 2 , and MgO. An extreme SiO 2 enrichment during MIS 11.3 and 9.3 was caused by an enhanced flux of biogenic silica (BSi). The geochemical structure of MIS 11 shows similar characteristics as seen in MIS 11 records from Lake Baikal (southeastern Siberia) and Antarctic ice cores, thereby arguing for the influence of global forcings on these records. High sediment content of TiO 2 , Fe 2 O 3 , MgO, Al 2 O 3 , LOI, Ni, Cr, and Zr typifies glacial stages, with the most marked increases during MIS 7.4 and 6.6. Reducing conditions during glacial times are indicated by peaks in the Fe 2 O 3 content and coinciding low Fe 2 O 3 /MnO ratios. This conclusion also is supported by P 2 O 5 and MnO enrichment, indicating an increased abundance of authigenic, fine-grained vivianite. Elemental ratios (CIA, CIW, PIA, and Rb/Sr) indicate that glacial sediments are depleted in mobile elements, like Na, Ca, K and Sr. This depletion was caused by changes in the sedimentation regime and thus reflects environmental changes.

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“…Although various archive-proxy based palaeoclimatic researches through Pleistocene-Holocene transition are available from the Indian Himalaya [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] but the poorly dated profiles obstructs their being most ideal high resolution records except for the Tsokar and Tso Moriri multi-proxy high resolution studies [39][40][41] respectively. Further, precisely dated stalagmite based multi-decadal records are rare through the Late Pleistocene-Holocene transition [42] although δ 18 O precipitation variability during Middle to Late Holocene has been obtained through U/Th dated speleothems [21,22,43,44].…”

Section: Introductionmentioning

confidence: 99%

Stalagmite Inferred High Resolution Climatic Changes through Pleistocene-Holocene Transition in Northwest Indian Himalaya

Kotlia

Singh

Sanwal

et al. 2016

J Earth Sci Clim Change

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Investigated for d 18 O and d 13 C isotopes, mineralogy and growth rate, a 20 cm long and 230Th-dated calcite stalagmite from Kalakot (Jammu and Kashmir Himalaya), has recorded high resolution precipitation variability during the Pleistocene-Holocene transition. At present, the study area is influenced by both the Indian Summer Monsoon (ISM) and Westerlies. The StalAge model indicates that the stalagmite grew between 16.3 ka to 9.5 ka BP under the ideal isotopic equilibrium conditions as revealed by the Hendy test results. The d18 O and d 13 C values range from -5.41 to -8.82% and -7.09 to -10.84% respectively. Although the U/Th chronology is poor due to low Uranium content in the samples resulting in relatively large errors, the first stalagmite inferred precipitation variability reconstructed from NW Indian Himalaya makes this study significant. The near footprints of three global events, e.g., Older Dryas (OD), Allerød period and Younger Drays (YD) can be noticed at ~14.3-13.9, 13.9-12.7 and 12.7-12.2 ka BP. The precipitation strength was weaker during the OD and YD, but was stronger during the Allerød interstadial. By the termination of YD interval, the climate seems fluctuating in the NW Himalaya. There seems variation in commencement, duration and termination of the above mentioned events in different parts of the globe due to latitude location and response time.

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Lateglacial and Holocene environmental changes in Ganga plain, Northern India

Cited by 132 publications

References 50 publications

Late Glacial to Holocene Indian Summer Monsoon Variability Based upon Sediment Records Taken from the Bay of Bengal

Late Glacial to Holocene Indian Summer Monsoon Variability Based upon Sediment Records Taken from the Bay of Bengal

Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11

Stalagmite Inferred High Resolution Climatic Changes through Pleistocene-Holocene Transition in Northwest Indian Himalaya

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