Arid
DOI10.1177/0959683616660162
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
ISSN0959-6836
EISSN1477-0911
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
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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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