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DOI10.1177/0959683619865599
Paleoenvironmental shifts spanning the last similar to 6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake: Anchar Lake, NW Himalaya
Lone, Aasif Mohmad1; Achyuthan, Hema1; Shah, Rayees Ahmad1; Sangode, Satish Jadgeo2; Kumar, Pankaj3; Chopra, Sundeep3; Sharma, Rajveer3
发表日期2019
ISSN0959-6836
EISSN1477-0911
英文摘要

Integrating multiproxy results (geochemistry, mineral magnetism, grain size, and C/N ratio variability supported by C-14 AMS dating), obtained from a 1.4-m sediment core retrieved from high-altitude Anchar Lake, Kashmir Valley, NW Himalaya, we present a 6000-years record of paleoenvironmental and paleolimnological shifts. Phase 1 (6000-4700 cal. yr BP) revealed a wetter climate with a significant terrestrial input corresponding to the gradual strengthening of the westerlies. Phase 2 (4700-3900 cal. yr BP) reflects an overall improved westerly precipitation and autochthonous sources of organic matter (OM). Magnetic parameters also indicate higher lake levels and reducing conditions during this phase. Phase 2 was followed by a gradual diminishing pattern of the westerlies as also represented by phase 3 (3900-2500 cal. yr BP) and phase 4 (2500-1600 cal. yr BP) indicating moderate precipitation conditions, catchment stability, and temperate and/or cold-dry climatic conditions. Phase 5 (1600-500 cal. yr BP) revealed the prevalence of moderately cold/dry and further subdued westerly precipitation. Phase 6 (500 cal. yr BP to present) is represented by reduced westerly precipitation, shrinking lake margins, and significant terrestrial/anthropogenic controls over the lake basin. Mineral magnetic parameters indicate reducing lake bottom water conditions and eutrophication during this phase due to anthropogenic activities. These paleoenvironmental shifts reveal near synchronous changes (within dating uncertainties) with other regional paleoclimate records close to the present Anchar Lake location and reflect the gradual late-Holocene diminishment of the amount of winter/early summer moisture provided by the mid-latitude westerlies.


WOS研究方向Physical Geography ; Geology
来源期刊HOLOCENE
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/101739
作者单位1.Anna Univ, Dept Geol, Chennai 600025, Tamil Nadu, India;
2.Savitribai Phule Pune Univ, Dept Geol, Pune, Maharashtra, India;
3.IUAC, New Delhi, India
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Lone, Aasif Mohmad,Achyuthan, Hema,Shah, Rayees Ahmad,et al. Paleoenvironmental shifts spanning the last similar to 6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake: Anchar Lake, NW Himalaya[J],2019.
APA Lone, Aasif Mohmad.,Achyuthan, Hema.,Shah, Rayees Ahmad.,Sangode, Satish Jadgeo.,Kumar, Pankaj.,...&Sharma, Rajveer.(2019).Paleoenvironmental shifts spanning the last similar to 6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake: Anchar Lake, NW Himalaya.HOLOCENE.
MLA Lone, Aasif Mohmad,et al."Paleoenvironmental shifts spanning the last similar to 6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake: Anchar Lake, NW Himalaya".HOLOCENE (2019).
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