Carbonate isotopes from high altitude Tso Moriri Lake (NW Himalayas) provide clues to late glacial and Holocene moisture source and atmospheric circulation changes

Mishra, Praveen K.; Prasad, Sushma; Anoop, Ambili; Plessen, Birgit; Jehangir, Arshid; Gaye, Birgit; Menzel, Philip; Weise, Stephan M.; Yousuf, A. R.

doi:10.1016/j.palaeo.2015.02.031

Cited by 61 publications

(46 citation statements)

References 55 publications

(99 reference statements)

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“…Western and NW Himalayas also show evidence of lower moisture availability during the mid-to late-Holocene from ~2700 cal yr BP to the present (Leipe et al, 2014;Mishra et al, 2015;Demske et al, 2016). According to our findings, the period between ~2700 to ~1000 cal yr BP was the most arid time period in the Banni with the climate ameliorating slightly after this towards the present (Fig 5).…”

supporting

confidence: 69%

“…isotope data from Wadhwana Lake in the semi-arid region of mainland Gujarat, Western India (Prasad et al, 2014b); C. presence of evaporite minerals in Lonar lake, Central India (Anoop et al, 2013;Prasad et al, 2014a); D. Al2O3 (wt%) from continental shelf sediments near Rushikulya river, Eastern India (Ankit et al 2016); E. 18 Ocarb data from Tso Moriri Lake, NW Himalayas (Mishra et al, 2015); F. Carbon isotope data from biomarkers derived 25 from the Godavari catchment (Ponton et al, 2012); G. Palynological, isotope and molecular proxy records from tropical Africa (Salzmann et al, 2002;Schefuß et al, 2005;Berke et al, 2012); H. Palynological and 13 Corg data from tropical South America Hooghiemstra, 1999, 2000;Marchant et al, 2001) and I. Palynological data from tropical Northern Australia (Shulmeister and Lees, 1995).…”

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confidence: 99%

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Mid-late Holocene vegetation response to climatic drivers and biotic disturbances in the Banni grasslands of western India

Pillai

Anoop

Sankaran

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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Citation:Pillai AAS, Anoop A, Sankaran M, Sanyal P, Jha DK and Ratnam J (2017) AbstractTropical grasslands and savannas are globally extensive, and are of significant environmental, economic, and ecological importance. These ecosystems are anticipated to be particularly sensitive to future changes in climate, and understanding how these systems have responded to climatic changes in the past can provide us with insights into their potential responses to future global change. In this study, the temporal dynamics of C3-C4 vegetation changes in response to changes in moisture availability, local fire events and changing levels of herbivory in a summer-rainfall region of Western India are reconstructed for the past ~4600 cal yr BP. Paleodata such as stable carbon isotope of bulk organic matter ( 13 Corg), oxygen isotope from carbonate shells ( 18 Oshell), macro-charcoal and herbivore dung fungal spores are reported from the retrieved cores of two wetland sites located in the Banni grasslands of Western India. Results show that vegetation in the Banni was composed mostly of C3 vegetation from ~4600 to ~2500 cal yr BP, after which there was a decline in C3vegetation. From the late-Holocene to the present, there was a mix of both C3 and C4 vegetation, with C4 grasses being more abundant in the ecosystem. These shifts were coincident with rainfall changes from more mesic conditions during ~4600 to ~2500 cal yr BP to more arid conditions towards the present as indicated by 18 Oshell isotope data. The period of increase in C4 vegetation also coincides with a period of increased biotic disturbances in the ecosystem, particularly fire. Given the current scenarios of global warming, recurrent drought events and increased anthropogenic use of similar ecosystems, such studies can provide us insights into potential future trajectories of these ecosystems.3

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confidence: 69%

mentioning

confidence: 99%

Mid-late Holocene vegetation response to climatic drivers and biotic disturbances in the Banni grasslands of western India

Pillai

Anoop

Sankaran

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Although the climatic inferences from the Tso Moriri lake Mishra et al, 2015) are not in agreement with these data sets, the climate records from most of the ISM-influenced regions indicate the strengthening of ISM during this phase (Yadava and Ramesh, 2001;Chauhan et al, 2010;Rawat et al, 2015). The disagreement between the previous studies (Tso Kar and Tso Moriri lakes) and our results may be attributed to the contribution of ISM and/or the attenuating impact of the westerlies (Wünnemann et al, 2010;Leipe, Demske, Tarasov, Wünnemann, et al, 2014;Mishra et al, 2015) to these records. Our interpretations receive enhanced confidence from the suggestions that high monsoonal runoff has been recorded from the Indus River during the period from ∼3500 to 2200 cal yr BP, based on varve thickness/counts verified by conventional and AMS 14 C dating (von Rad et al, 1999).…”

Section: Middle Meghalayan (∼3400-1500 Cal Yr Bp)contrasting

confidence: 99%

Holocene hydroclimatic variability in the Zanskar Valley, Northwestern Himalaya, India

et al. 2020

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A 1.3-m-long sediment core from the Penzi-la pass, Zanskar Valley, provides a record of hydroclimatic conditions and abrupt climate changes over short time scales since the mid-Holocene. These climatic changes of centennial time scale are crucial to understanding the hydroclimatic variability in northwestern (NW) Himalaya. Relatively higher δ13C values complemented by total organic carbon, loss on ignition, grain size parameters, and lower Rubidium/Strontium ratios during the Late Northgrippian imply that the area had a dry climate during the period from ~6200–4500 cal yr BP. Subsequently, a relatively stable hydroclimatic environment was experienced between ~4500 and 3400 cal yr BP. After ~3400 cal yr BP the multiproxy data show gradual strengthening of hydroclimatic conditions, however, this trend is interrupted by high-amplitude abrupt reversals (dry events) with a stepwise decreasing intensity at ~3300, 2600, 1700, and 400 cal yr BP. The two most important climatic events of the last millennia (i.e., Medieval Climate Anomaly and the Little Ice Age) were also recorded from the sedimentary archive. Overall, our data show a progressive increase in the moisture availability in the Zanskar Valley and are in agreement with the late Holocene climatic trends of central and western Himalaya.

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“…Progressive changing in these environmental factors, or endmember mixing among different reservoirs influenced by these factors could indeed cause potential correlation in δ 13 C carb vs. δ 18 O carb (e.g., Li and Ku, 1997;Horton et al, 2015;Mishra et al, 2015). However, to link these potential mechanisms to the uppermost Doushantuo Formation requires a comprehensive evaluation based on integrated sedimentological, petrographic, and geochemical observations.…”

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confidence: 99%

Was the Ediacaran Shuram Excursion a globally synchronized early diagenetic event? Insights from methane-derived authigenic carbonates in the uppermost Doushantuo Formation, South China

et al. 2017

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The Ediacaran Period is characterized by the most profound negative carbon isotope (δ 13 C) excursion in Earth history, the Shuram Excursion. Various hypotheses -including the massive oxidation of dissolved organic carbon (DOC) in the oceans, the weathering of terrestrial organic carbon, or the release and oxidation of methane hydrates and/or expelled petroleum from the subsurface -have been proposed as sources of the 13 C-depleted carbon. More recently, it has been suggested that global-scale precipitation of early authigenic carbonates, driven by anaerobic microbial metabolism in unconsolidated sediments, may have caused the Shuram Excursion, but empirical evidence is lacking. Here we present a comprehensive analysis of a Shuram-associated interval from the uppermost Doushantuo Formation in South China. Our study reveals petrographic evidence of methane-derived authigenic calcite (formed as early diagenetic cements and nodules) that are remarkably depleted in 13 C -suggesting a buildup of alkalinity in pore fluids through the anaerobic oxidation of methane (AOM) -and systematically depleted in 18 O relative to co-occurring dolomite. Early authigenesis of these minerals is likely to be driven by increased microbial sulfate reduction, triggered by enhanced continental weathering in the context of a marked rise in atmospheric oxygen levels. In light of the finding of methane-derived authigenic carbonates at Zhongling, and based on our basin-scale stratigraphic correlation, we hypothesize that the marked 13 C and 18 O depletion (including their co-variation noted worldwide) in the Shuram Excursion may reflect an episode of authigenesis occurring within a sulfate-methane transition zone (SMTZ). If true, the Shuram Excursion was then a global biogeochemical response to enhanced seawater sulfate concentration in the Ediacaran ocean driven by the Neoproterozoic oxidation of surface environments. This paleo-oceanographic transition may have therefore paved the way for subsequent evolution and diversification of animals. Our study highlights the significance of an integrated approach that combines petrography, mineralogy, and texture-specific micro-drilling geochemistry in chemostratigraphic studies.

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Carbonate isotopes from high altitude Tso Moriri Lake (NW Himalayas) provide clues to late glacial and Holocene moisture source and atmospheric circulation changes

Cited by 61 publications

References 55 publications

Mid-late Holocene vegetation response to climatic drivers and biotic disturbances in the Banni grasslands of western India

Mid-late Holocene vegetation response to climatic drivers and biotic disturbances in the Banni grasslands of western India

Holocene hydroclimatic variability in the Zanskar Valley, Northwestern Himalaya, India

Was the Ediacaran Shuram Excursion a globally synchronized early diagenetic event? Insights from methane-derived authigenic carbonates in the uppermost Doushantuo Formation, South China

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