Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1177/0959683616660162 |
Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India: Geochemistry and palynology | |
Rajmanickam, Vijayaraj1; Achyuthan, Hema1; Eastoe, Christopher2; Farooqui, Anjum3 | |
通讯作者 | Achyuthan, Hema |
来源期刊 | HOLOCENE
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ISSN | 0959-6836 |
EISSN | 1477-0911 |
出版年 | 2017 |
卷号 | 27期号:3页码:404-417 |
英文摘要 | The Kukkal basin, Tamil Nadu, India, receives most of its rain from the southwest monsoon (SWM). A sediment core from Kukkal Lake preserves a continuous sediment record from the early-Holocene to present (9000 yr BP to present). The present lake is situated at an elevation of similar to 1887m a.s.l., in a small basin that appears to have alternated between a and wetland depositional environment. Climate proxies, including sediment texture, total organic carbon (TOC), total nitrogen (TN), C/N, pollen and geochemical composition indicate a steady progression to wetter conditions, with two stepwise changes at about 8000, and between 3200 and 1800 yr BP. The change at 8000 yr BP appears to correspond to a brief (100-150years) dry spell recorded elsewhere in India. The change at 3200-1800 yr BP consisted in a rapid intensification of the SWM, and may correlate with the initiation of the Roman Warm Period’. There is no clear evidence of changes at the times of the Medieval Warm Period’ (MWP’) and the Little Ice Age’ (LIA’). The C/N ratio of the sediments ranges from 14.02 to 8.31, indicating that the organic matter originated from a mixture of lacustrine algae, vascular and terrestrial plants. Chemical weathering indices (Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), and Plagioclase Index of Alteration (PIA)) are consistent with extreme silicate weathering. Pollen data show a development from savanna vegetation prior to about 8000 yr BP, followed by grassland with palms, the appearance of ferns just prior to 3200 yr BP and the establishment of the tropical humid forest between 3200 and about 1800 yr BP. |
英文关键词 | chemical indices of weathering climate change ferns Holocene India radiocarbon dating southwest monsoon Tamil Nadu tropical lake tropical wetland |
类型 | Article |
语种 | 英语 |
国家 | India ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000395385500008 |
WOS关键词 | MEDIEVAL WARM PERIOD ; CHEMICAL-WEATHERING INDEXES ; ASIAN SOUTHWEST MONSOON ; TREE-RING CHRONOLOGIES ; NORTH-ATLANTIC CLIMATE ; LATE QUATERNARY ; SUMMER MONSOON ; ARABIAN SEA ; THAR-DESERT ; ICE-AGE |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Physical Geography ; Geology |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/199422 |
作者单位 | 1.Anna Univ, Dept Geol, Madras 600025, Tamil Nadu, India; 2.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA; 3.Birbal Sahni Inst Paleobot, Lucknow, Uttar Pradesh, India |
推荐引用方式 GB/T 7714 | Rajmanickam, Vijayaraj,Achyuthan, Hema,Eastoe, Christopher,et al. Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India: Geochemistry and palynology[J]. University of Arizona,2017,27(3):404-417. |
APA | Rajmanickam, Vijayaraj,Achyuthan, Hema,Eastoe, Christopher,&Farooqui, Anjum.(2017).Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India: Geochemistry and palynology.HOLOCENE,27(3),404-417. |
MLA | Rajmanickam, Vijayaraj,et al."Early-Holocene to present palaeoenvironmental shifts and short climate events from the tropical wetland and lake sediments, Kukkal Lake, Southern India: Geochemistry and palynology".HOLOCENE 27.3(2017):404-417. |
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