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DOI | 10.3389/feart.2019.00002 |
Reconstruction of Late Quaternary Climate From a Paleo-Lacustrine Profile in the Central (Kumaun) Himalaya: Viewing the Results in a Regional Context | |
Sanwal, Jaishri1; Rajendran, C. P.1; Sheshshayee, M. S.2 | |
发表日期 | 2019 |
ISSN | 2296-6463 |
卷号 | 7 |
英文摘要 | In this paper, we reconstruct the climatic changes starting from the late Pleistocene to the early Holocene as recorded from a fluvio-lacustrine section located within the Kumaun Central Himalaya. The results suggest two major climatic events corresponding with the Last Glacial Maximum (LGM) and Older Dryas (OD). The values of carbon isotopes vary between -23 parts per thousand and -14 parts per thousand, along with a shift in vegetation pattern. The lower part of the section shows prevalence of C-3 type vegetation, indicating warm and moist conditions at around 25,000 years BP, possibly coinciding with the intensification of the Indian Summer Monsoon. The onset of cold and arid phase is evident in the gradual shift in vegetation pattern from C-3 to C-4 plants, which is prominently observed in the middle part of the paleolake profile. Eventually, as the value of delta C-13 during this time interval confirms, a prolonged phase of cold and arid climate sets in, coinciding with the strengthening of winter westerlies. This cold phase is dated at similar to 19,000 years BP and the extended phase of cold interval observed at Dwarahat profile correlates well with previous results elsewhere from the Himalaya. The profile also shows that the LGM phase gradually transforms into a warm and moist climate. This transition registered at 200 cm above the base of the profile, marks the end of glacial period. The short, yet a clear warm spike could be related to the oscillation of Bolling-Allerod interstadial at similar to 15,000 years BP. A significant negative excursion marked by an abrupt increase in delta C-13 values from -20 parts per thousand to -14 parts per thousand observed toward the top part of the profile, however, is reflective of the reduced monsoon precipitation, corresponding possibly with OD. The topmost part of the profile that registers a depleted trend in delta C-13 values with dominance of C-3 vegetation marks the return of the warm and moist climate. |
WOS研究方向 | Geology |
来源期刊 | FRONTIERS IN EARTH SCIENCE
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/92213 |
作者单位 | 1.Jawaharlal Nehru Ctr Adv Sci Res, Geodynam Unit, Bengaluru, India; 2.Univ Agr Sci, Dept Crop Physiol, Bengaluru, India |
推荐引用方式 GB/T 7714 | Sanwal, Jaishri,Rajendran, C. P.,Sheshshayee, M. S.. Reconstruction of Late Quaternary Climate From a Paleo-Lacustrine Profile in the Central (Kumaun) Himalaya: Viewing the Results in a Regional Context[J],2019,7. |
APA | Sanwal, Jaishri,Rajendran, C. P.,&Sheshshayee, M. S..(2019).Reconstruction of Late Quaternary Climate From a Paleo-Lacustrine Profile in the Central (Kumaun) Himalaya: Viewing the Results in a Regional Context.FRONTIERS IN EARTH SCIENCE,7. |
MLA | Sanwal, Jaishri,et al."Reconstruction of Late Quaternary Climate From a Paleo-Lacustrine Profile in the Central (Kumaun) Himalaya: Viewing the Results in a Regional Context".FRONTIERS IN EARTH SCIENCE 7(2019). |
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