globalchange  > 全球变化的国际研究计划
DOI: 10.1177/0959683619865599
WOS记录号: WOS:000479999900001
论文题名:
Paleoenvironmental shifts spanning the last similar to 6000 years and recent anthropogenic controls inferred from a high-altitude temperate lake: Anchar Lake, NW Himalaya
作者: Lone, Aasif Mohmad1; Achyuthan, Hema1; Shah, Rayees Ahmad1; Sangode, Satish Jadgeo2; Kumar, Pankaj3; Chopra, Sundeep3; Sharma, Rajveer3
通讯作者: Achyuthan, Hema
刊名: HOLOCENE
ISSN: 0959-6836
EISSN: 1477-0911
出版年: 2019
语种: 英语
英文关键词: C-14 AMS dating ; Anchar Lake ; Kashmir Himalayas ; magnetic and geochemical analyses ; OM and C ; N ratio ; paleoenvironmental shifts
WOS关键词: INDIAN-SUMMER MONSOON ; CENTRAL TIAN-SHAN ; KASHMIR VALLEY ; LATE HOLOCENE ; ENVIRONMENTAL-CHANGES ; CLIMATE-CHANGE ; MAGNETIC-SUSCEPTIBILITY ; MIDLATITUDE WESTERLIES ; SPATIAL-DISTRIBUTION ; VEGETATION HISTORY
WOS学科分类: Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向: Physical Geography ; Geology
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.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/145231
Appears in Collections:全球变化的国际研究计划

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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

Recommended Citation:
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]. HOLOCENE,2019-01-01
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