干旱区生态环境知识资源中心(Arid): Paleoenvironment of the Central Himalaya during late MIS 3 using stable isotopic compositions of lacustrine organic matter occluded in diatoms and sediments

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DOI	10.1016/j.quaint.2020.08.024
	Paleoenvironment of the Central Himalaya during late MIS 3 using stable isotopic compositions of lacustrine organic matter occluded in diatoms and sediments
	Rahman, Abdur; Sarkar, Siddhartha; Kumar, Sanjeev
通讯作者	Kumar, S
来源期刊	QUATERNARY INTERNATIONAL
ISSN	1040-6182
EISSN	1873-4553
出版年	2020
卷号	558 页码:1-9
英文摘要	Marine Isotope Stage (MIS) 3 was an interstadial stage in the climate history of the Earth where the last phase (40-30 ka) showed relatively warmer climate over the northwest China, Tibetan Plateau, and northwestern India compared to other regions of the world. However, not many studies are reported for climate variability during this period from the Himalayan region. Here, an attempt has been made to understand the paleoenvironment of the Central Himalaya during 45-29 ka using stable isotopic compositions of carbon (delta C-13(TOC)) and nitrogen (delta N-15(TN)) along with their elemental ratios (TOC/TN) in bulk organic matter and occluded organic matter within diatom frustules (delta C-13(Di)atom) of a paleolake sequence. The variabilities in delta C-13(Di)atom, delta C-13(TOC), and TOC/TN ratios indicated intermittent changes in the lake carbon dynamics from bicarbonate dominated system to carbon dioxide dominated regime. These changes in lacustrine carbon cycling provided evidence for existence of sporadic dry events in the Central Himalaya during 45-29 ka. In agreement with the records from the northwest China, Tibetan Plateau, and northwestern India, our results also confirm the existence of a relatively wet and humid period during 40-32 ka in the Central Himalaya. Therefore, it appeared that compared to other parts of the world, relatively wet and humid climate existed throughout this region. However, the mechanism behind this wet and humid phase remains to be explored and warrants a high resolution paleoclimate study in the Himalaya.
英文关键词	MIS 3 Himalaya Stable isotopes Diatom Occluded organic matter
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000579842700001
WOS关键词	QUATERNARY ENVIRONMENTAL-CHANGES ; INDIAN-SUMMER MONSOON ; TIBETAN PLATEAU ; QAIDAM BASIN ; NORTHWESTERN CHINA ; VEGETATION CHANGE ; ATLANTIC-OCEAN ; TENGGER DESERT ; NORTH-ATLANTIC ; CARBON
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326898
作者单位	[Rahman, Abdur; Sarkar, Siddhartha; Kumar, Sanjeev] Phys Res Lab, Geosci Div, Ahmadabad, Gujarat, India
推荐引用方式 GB/T 7714	Rahman, Abdur,Sarkar, Siddhartha,Kumar, Sanjeev. Paleoenvironment of the Central Himalaya during late MIS 3 using stable isotopic compositions of lacustrine organic matter occluded in diatoms and sediments[J],2020,558:1-9.
APA	Rahman, Abdur,Sarkar, Siddhartha,&Kumar, Sanjeev.(2020).Paleoenvironment of the Central Himalaya during late MIS 3 using stable isotopic compositions of lacustrine organic matter occluded in diatoms and sediments.QUATERNARY INTERNATIONAL,558,1-9.
MLA	Rahman, Abdur,et al."Paleoenvironment of the Central Himalaya during late MIS 3 using stable isotopic compositions of lacustrine organic matter occluded in diatoms and sediments".QUATERNARY INTERNATIONAL 558(2020):1-9.