A 13,000  year record of environmental magnetic variations in the lake and peat deposits from the Chandra valley, Lahaul: Implications to Holocene monsoonal variability in the NW Himalaya

Rawat, Suman; Gupta, Anil K.; Srivastava, Poonam; Sangode, S. J.; Nainwal, H. C.

doi:10.1016/j.palaeo.2015.08.044

Cited by 57 publications

(30 citation statements)

References 72 publications

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“…SIRM/ χ lf of Core DN changes within the range of ~0.47–17.37 kA/m with a mean of 2.59 kA/m, much lower than the threshold value ranged between ~30 and 70 kA/m for the presence of authigenic iron‐sulfide (Rawat et al, ; Snowball, ). In addition, the FORC diagrams (Figures k–n) show peak coercivity between 10 and 20 mT and no clear evidences for the presence of authigenic greigite characterized by peak coercivity at ~60–70 mT with strong magnetostatic interactions (Roberts et al, , ).…”

Section: Discussionmentioning

confidence: 96%

“…IRM 2000mT here was used as saturation isothermal remanence magnetization (SIRM). The "hard" IRM (HIRM) was defined as HIRM = 0.5 × (SIRM+IRM -0.3T ) (Rawat et al, 2015). Interparametric ratios of χ ARM /χ lf , χ ARM /SIRM, and SIRM/χ lf were also calculated to distinguish the magnetic grain sizes and magnetic mineralogy (Snowball, 1991;Thompson & Oldfield, 1986).…”

Section: Magnetic Measurementsmentioning

confidence: 99%

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Late Quaternary East Asian Summer Monsoon Variability Deduced From Lacustrine Mineral Magnetic Records of Dahu Swamp, Southern China

Wei

Xue

et al. 2020

Paleoceanog and Paleoclimatol

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The lack of long‐term and well‐preserved terrestrial archives from southern China largely impedes our understanding of past variability in the East Asian summer monsoon (EASM). In this study, we developed rainfall/precipitation‐related records by conducting a systematic mineral‐magnetic investigation on Dahu Swamp sediments over the past ~47.0 ka. The integrated magnetic results show that the magnetic minerals in the sediments were mainly catchment derived, likely reflecting hydroclimatic changes associated with EASM strength. In combination with other climatic proxies, our magnetic records reveal a relatively wet climate during the middle‐late Marine Oxygen Isotope Stage 3 and the Holocene and a relatively dry climate during the Marine Oxygen Isotope Stage 2, which broadly follow the precession‐induced summer insolation changes in the middle‐low latitudes of the Northern Hemisphere. The regional heterogeneity of the EASM rainfall evolution might be ascribed to the changes in timing and duration of Mei‐yu Front in China, which were closely associated with the El Niño/Southern Oscillation activities through its effects on the Western Pacific Subtropical High position. Long‐term climatic patterns inferred from Dahu Swamp were broadly similar to those of the Western Pacific Warm Pool region, especially during the mid‐Holocene rainfall optimum period, further supporting that the thermal mean states of the tropical Pacific associated with El Niño/Southern Oscillation modes may influence EASM precipitation. Our results highlight the coupled influence of external insolation forcing and internal low‐latitude processes on the spatial and temporal EASM variability, and understanding these influences could be critical to the prediction of future monsoon behavior under ongoing and future global warming.

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Section: Discussionmentioning

confidence: 96%

Section: Magnetic Measurementsmentioning

confidence: 99%

Late Quaternary East Asian Summer Monsoon Variability Deduced From Lacustrine Mineral Magnetic Records of Dahu Swamp, Southern China

Wei

Xue

et al. 2020

Paleoceanog and Paleoclimatol

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“…years BP in the peat-lake deposits from a post-glacial lake in the adjoining Chandra Valley of the Lahaul Himalaya suggest an overall increased ISM intensity during early to mid-Holocene, which is well correlated with the δ 18 O record of the ISM-influenced Dongge Cave from~11,500-6000 cal. years BP [79]. Thus, the second glacial event (KH-II) occurred during the cold Bond event-7 and sustained beyond the early Holocene climatic optimum due to ice-albedo feedback mechanism; an increase in precipitation during the early Holocene is supposed to have lowered the summer temperature due to an increase in the cloudiness (an increase in albedo) and evaporating cooling [23,53].…”

Section: Discussionmentioning

confidence: 99%

Late Holocene Glacier Dynamics in the Miyar Basin, Lahaul Himalaya, India

et al. 2017

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Detailed field mapping of glacial and paraglacial landforms and optical dating from these landforms are used to reconstruct the early Holocene glaciation in the semi-arid region of Miyar basin, Lahaul Himalaya. The study identifies three stages of glaciation, of decreasing magnitude and termed, from oldest to youngest, the Miyar stage (MR-I), Khanjar stage (KH-II), and Menthosa advance (M-III). The oldest glacial stage (MR-I) has been established on the basis of detailed geomorphological evidence such as U-shaped valley morphology, trimlines, and truncated spurs. It is speculated to be older than the global Last Glacial Maximum (gLGM) based on the magnitude of ∆ELA (Equilibrium-Line Altitude, 606m). No evidence of glacier expansion recorded from the basin correlates with the period of the gLGM. The second stage (KH-II) is well represented by extensive depositional features such as lateral and terminal moraines, drumlins, and lacustrine fills that have been constrained within 10 ± 1 to 6.6 ± 1.0 ka (Optically stimulated luminescence-OSL-ages), dating it to the early Holocene advance following the Younger Dryas cooling event. Exceptionally young glacial records of expansion are limited within a few hundred meters of the present termini of tributary glaciers and correlates with the 18th-century cooling event. Records of this glacial advance, termed the Menthosa advance, are clearly noticed in some tributary valleys.

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“…Techniques can also be applied to peat sediment. By extracting magnetic data from the Chandra peat bog, Holocene monsoonal variability in the Northwest Himalaya was reconstructed, suggesting that the intensive Indian summer monsoon (ISM) increases the concentration of antiferromagnetic minerals while the maximum influx of antiferromagnetic minerals responded to optimum climate (Rawat et al ., ). Elemental characteristics in peat can also reflect paleoclimate changes.…”

Section: Introductionmentioning

confidence: 97%

Characteristics of peat humification, magnetic susceptibility and trace elements of Hani peatland, northeastern China: paleoclimatic implications

Cheng

Mao

et al. 2017

Atmospheric Science Letters

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A high-resolution peat humification record is obtained from Hani peatland, northeastern China to study climate change. An absorbance value time series from alkali-extraction is used as a peat humification indicator. In addition, Hani peat magnetic susceptibility and trace elements have also been investigated. There is a sensitive response to abrupt climate changes when comparing a high-resolution peat humification record with a Hani 18 O temperature proxy record and a drift ice record from the North Atlantic Ocean. Based on analyses of factors that affect peat decomposition, we suggest similar paleoclimate significance between the Hani and Dajiuhu peat on the degree of humification with a higher peat humification indicating colder and drier climate conditions. In contrast, a warm and moist climate provides a deoxidized condition that results in lower peat humification. Moreover, the Rb/Sr ratios and

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A 13,000 year record of environmental magnetic variations in the lake and peat deposits from the Chandra valley, Lahaul: Implications to Holocene monsoonal variability in the NW Himalaya

Cited by 57 publications

References 72 publications

Late Quaternary East Asian Summer Monsoon Variability Deduced From Lacustrine Mineral Magnetic Records of Dahu Swamp, Southern China

Late Quaternary East Asian Summer Monsoon Variability Deduced From Lacustrine Mineral Magnetic Records of Dahu Swamp, Southern China

Late Holocene Glacier Dynamics in the Miyar Basin, Lahaul Himalaya, India

Characteristics of peat humification, magnetic susceptibility and trace elements of Hani peatland, northeastern China: paleoclimatic implications

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