Prolonged monsoon droughts and links to Indo-Pacific warm pool: A Holocene record from Lonar Lake, central India

Prasad, Sushma; Anoop, Ambili; Riedel, Nils; Sarkar, Saswati; Menzel, Philip; Basavaiah, N.; Krishnan, R.; Fuller, Dorian Q.; Plessen, Birgit; Gaye, Birgit; Röhl, Ursula; Wilkes, Heinz; Sachse, Dirk; Sawant, R; Wiesner, M.; Stebich, Martina

doi:10.1016/j.epsl.2014.01.043

Cited by 220 publications

(216 citation statements)

References 84 publications

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“…Modeling experiments by Pausata et al (2011) Ocean . If the ENSO-controlled Indian Ocean SST variations seem to affect theamount of moisture that the westerlies bring to the Indian monsoon system (Clement et al, 1999;Gibbson et al, 2014), our data suggest, in line with Prasad et al(2014), that Indian summer rainfall distribution is preferentially impacted by the ITCZ position (in link with insolation feedback mechanisms) than by ENSO at centennial, millennial and glacial/interglacial scales.…”

Section: Indian Monsoon Variations Under Three Different Climate Bounsupporting

confidence: 67%

“…However, in Central India, sedentary-agriculture is only detected at around 4,000 cal years BP as the climate aridified (Asouti and Fuller, 2008;Ponton et al, 2012;Prasad et al, 2014). Therefore, the coastal forest fluctuations that we observe prior to 4,000 cal years BP reveal the natural evolution of vegetation, and represent an opportunity to use for the first time, these Arecaceae trees as tracers of the Indian summer monsoon.…”

Section: Orbital and Millennial-scale Variability Of The Indian Monsomentioning

confidence: 97%

“…the Core Monsoon Zone (CMZ), and under different climate regimes (e.g. Ponton et al, 2012 for the Holocene Godavari basin and Prasad et al, 2014 for the crater lake Lonar in the Holocene).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Indian monsoon variations during three contrasting climatic periods: The Holocene, Heinrich Stadial 2 and the last interglacial–glacial transition

Zorzi

Goñi

Anupama

et al. 2015

Quaternary Science Reviews

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Section: Indian Monsoon Variations Under Three Different Climate Bounsupporting

confidence: 67%

Section: Orbital and Millennial-scale Variability Of The Indian Monsomentioning

confidence: 97%

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Indian monsoon variations during three contrasting climatic periods: The Holocene, Heinrich Stadial 2 and the last interglacial–glacial transition

Zorzi

Goñi

Anupama

et al. 2015

Quaternary Science Reviews

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“…) advisable to treat such data with caution as XRF measurements give only a qualitative overview of the elemental abundances. However, as shown in the earlier study by Prasad et al (2014), the Al counts are strongly correlated to the Si, Ti and K counts obtained from the same core (shown in Fig.B1). …”

Section: A2 Estimating Depth-spanning Weight Functionsmentioning

confidence: 58%

“…As an application to a real-world scenario, we consider the set of age-depth 14 C measurements from the Lonar lake in central India (Anoop et al, 2013;Prasad et al, 2014). The radiocarbon ages used for the analysis are tabulated in Appendix B1 and labeled in Fig.…”

Section: Holocene Proxies From Central Indiamentioning

confidence: 99%

Estimation of sedimentary proxy records together with associated uncertainty

Goswami

Heitzig

Rehfeld

et al. 2014

Nonlin. Processes Geophys.

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Abstract. Sedimentary proxy records constitute a significant portion of the recorded evidence that allows us to investigate paleoclimatic conditions and variability. However, uncertainties in the dating of proxy archives limit our ability to fix the timing of past events and interpret proxy record intercomparisons. While there are various age-modeling approaches to improve the estimation of the age-depth relations of archives, relatively little focus has been placed on the propagation of the age (and radiocarbon calibration) uncertainties into the final proxy record.We present a generic Bayesian framework to estimate proxy records along with their associated uncertainty, starting with the radiometric age-depth and proxy-depth measurements, and a radiometric calibration curve if required. We provide analytical expressions for the posterior proxy probability distributions at any given calendar age, from which the expected proxy values and their uncertainty can be estimated. We illustrate our method using two synthetic data sets and then use it to construct the proxy records for groundwater inflow and surface erosion from Lonar lake in central India.Our analysis reveals interrelations between the uncertainty of the proxy record over time and the variance of proxies along the depth of the archive. For the Lonar lake proxies, we show that, rather than the age uncertainties, it is the proxy variance combined with calibration uncertainty that accounts for most of the final uncertainty. We represent the proxy records as probability distributions on a precise, error-free timescale that makes further time series analyses and intercomparisons of proxies relatively simple and clear. Our approach provides a coherent understanding of age uncertainties within sedimentary proxy records that involve radiometric dating. It can be potentially used within existing age modeling structures to bring forth a reliable and consistent framework for proxy record estimation.

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Organic carbon preservation in Southeastern Arabian Sea sediments since mid‐Holocene: Implications to South Asian Summer Monsoon variability

Nagoji

Tiwari

2017

Geochem Geophys Geosyst

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The earlier studies show a contrasting long‐term trend of the South Asian Summer Monsoon (SASM) after attaining the precessional forcing induced mid‐Holocene maximum. The increasing total organic carbon (TOC) concentration of marine sediments in the Southeastern Arabian Sea (SEAS) has been interpreted to imply strengthening SASM since mid‐Holocene by a few studies. However, TOC concentration is also influenced by redox conditions, sedimentation rate, and an influx of terrigenous matter depending on the regional settings. So, it needs to be ascertained whether the TOC concentration of the sediments in the SEAS is a signal of productivity related to the SASM strength or preservation. Therefore, we studied multiple proxies (TOC, total nitrogen, atomic C/N, δ13Corg, CaCO3, and major and trace elements concentration) for determining the productivity, redox conditions, detrital supply, and provenance in a sediment core from the upper continental slope of the SEAS spanning the past ∼4700 years at centennial scale resolution. The present study shows that the observed increase in the TOC values since the mid‐Holocene is a result of better preservation caused by increased sedimentation rate and enhanced reducing conditions. We further show that the SASM has been declining since mid‐Holocene after attaining a precession‐forced maximum, which corroborates the earlier model ensemble studies.

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Prolonged monsoon droughts and links to Indo-Pacific warm pool: A Holocene record from Lonar Lake, central India

Cited by 220 publications

References 84 publications

Indian monsoon variations during three contrasting climatic periods: The Holocene, Heinrich Stadial 2 and the last interglacial–glacial transition

Indian monsoon variations during three contrasting climatic periods: The Holocene, Heinrich Stadial 2 and the last interglacial–glacial transition

Estimation of sedimentary proxy records together with associated uncertainty

Organic carbon preservation in Southeastern Arabian Sea sediments since mid‐Holocene: Implications to South Asian Summer Monsoon variability

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