Mineralogical, geochemical, and magnetic susceptibility variations in the loess-paleosol sequence from Pattan, Kashmir Valley, India record an enhanced Indian summer monsoon around 35 ka

2021 ◽  
Author(s):  
Mohammad Tauseef ◽  
Esha Ray ◽  
Debajyoti Paul ◽  
Javed N. Malik ◽  
Ishtiaq Ahmad
Keyword(s):  
Magnetic Susceptibility ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Kashmir Valley

Palaeoenvironmental dynamics and Palaeolithic occupation at Katoati, Thar Desert, India

2017 ◽  
Vol 87 (2) ◽  
pp. 298-313 ◽  
Author(s):  
James Blinkhorn ◽  
Hema Achyuthan ◽  
Peter Ditchfield ◽  
Michael Petraglia
Keyword(s):  
Magnetic Susceptibility ◽  
Stable Isotope ◽  
Late Pleistocene ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Archaeological Site ◽  
Thar Desert ◽  
Loss On Ignition ◽  
X Ray ◽  
Field Recording

AbstractLate Pleistocene palaeoenvironments in the Thar Desert (India), located at the eastern extent of the Saharo-Arabian desert belt, have fluctuated considerably as a result of the varying range and intensity of the Indian summer monsoon. Phases of widespread Pleistocene aridity are well documented in the Thar Desert, but research focusing on humid proxies is critical to examine how the region may have facilitated population expansions across southern Asia. At Katoati, located on the northeast margin of the Thar Desert, the combination of field recording of sediment sections with detailed analyses (micromorphology, stable isotope, loss on ignition, magnetic susceptibility, and X-ray fluorescence) from an archaeological site identify a series of hominin occupations during phases of enhanced humidity between ~96 and 60 ka. A gradient of humidity on the eastern margin of the Thar Desert during the late Pleistocene is identified, with the periodic humidity evident at Katoati occurring more frequently and with longer duration towards the southern margin. This uneven distribution of humidity in the Thar Desert is likely to have strongly influenced when and where hominin populations could expand into and across the region.

scholarly journals Indian summer monsoon variability and vegetation changes in the core monsoon zone, India, during the Holocene: A multiproxy study

The Holocene ◽  
2018 ◽  
Vol 29 (1) ◽  
pp. 110-119 ◽  
Author(s):  
Kamlesh Kumar ◽  
Shailesh Agrawal ◽  
Anupam Sharma ◽  
Shilpa Pandey
Keyword(s):  
Magnetic Susceptibility ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Central India ◽  
Vegetation Changes ◽  
Sudden Increase ◽  
The Holocene ◽  
The Core ◽  
Monsoon Variability ◽  
Three Stages

We present the results of sediment texture, δ13C values, TOC, TN, TOC/TN, and magnetic susceptibility (χlf) of a 1.54-m deep sediment trench recovered from the core monsoon zone (CMZ) of central India, to understand the paleovegetational history and Indian summer monsoon (ISM) variability during the Holocene. The lower δ13C values, TOC/TN ratio, and magnetic susceptibility (χlf) from ~11.4 to 9.5 ka BP suggest enhanced ISM intensity, which is well correlated with other available ISM records from both terrestrial as well as marine archives. A gradual stepwise expansion of C4 plants during ~8.1 and 6.3 ka BP, ~6.3 to 4.7 ka BP, and ~3.0 to 2.0 ka BP suggests a gradual weakening of ISM. The highest δ13C values (–18.7‰) recorded at ~2.0 ka BP indicate the dominance of C4 plants suggesting the weakest phase of ISM in the study area. The expansion of C3 plants from ~2.0 to 1.6 ka BP indicates a sudden increase in ISM intensity. Subsequently, three stages of enhanced ISM have been recorded between ~1.6 and 0.93 ka BP, ~0.76 and 0.42 ka BP, and ~0.28 ka BP to present.

VARIABILITY IN THE INDIAN SUMMER MONSOON PRECIPITATION AND LAKE LEVELS IN EASTERN TIBET

2016 ◽  
Author(s):  
Melanie Perello ◽  
◽  
Broxton W. Bird ◽  
Yanbin Lei ◽  
Pratigya J. Polissar ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Monsoon Precipitation ◽  
Lake Levels ◽  
Eastern Tibet

scholarly journals Tectonic and climatic drivers of Asian monsoon evolution

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
James R. Thomson ◽  
Philip B. Holden ◽  
Pallavi Anand ◽  
Neil R. Edwards ◽  
Cécile A. Porchier ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Asian Monsoon ◽  
Monsoon Rainfall ◽  
East Asian Monsoon ◽  
East Asian ◽  
Meridional Overturning Circulation ◽  
Great Debate ◽  
Climatic Drivers ◽  
Meridional Overturning

AbstractAsian Monsoon rainfall supports the livelihood of billions of people, yet the relative importance of different drivers remains an issue of great debate. Here, we present 30 million-year model-based reconstructions of Indian summer monsoon and South East Asian monsoon rainfall at millennial resolution. We show that precession is the dominant direct driver of orbital variability, although variability on obliquity timescales is driven through the ice sheets. Orographic development dominated the evolution of the South East Asian monsoon, but Indian summer monsoon evolution involved a complex mix of contributions from orography (39%), precession (25%), atmospheric CO2 (21%), ice-sheet state (5%) and ocean gateways (5%). Prior to 15 Ma, the Indian summer monsoon was broadly stable, albeit with substantial orbital variability. From 15 Ma to 5 Ma, strengthening was driven by a combination of orography and glaciation, while closure of the Panama gateway provided the prerequisite for the modern Indian summer monsoon state through a strengthened Atlantic meridional overturning circulation.

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