气候变化领域集成服务门户(CCPortal): Sedimentary rhythm of Mn-carbonate laminae induced by East Asian summer monsoon variability and human activity in Lake Ohnuma; southwest Hokkaido; northern Japan

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DOI	10.1016/j.quascirev.2020.106576
	Sedimentary rhythm of Mn-carbonate laminae induced by East Asian summer monsoon variability and human activity in Lake Ohnuma; southwest Hokkaido; northern Japan
	Katsuta N.; Naito S.; Ikeda H.; Tanaka K.; Murakami T.; Ochiai S.; Miyata Y.; Shimizu M.; Hayano A.; Fukui K.; Hasegawa H.; Nagao S.; Nakagawa M.; Nagashima K.; Niwa M.; Murayama M.; Kagawa M.; Kawakami S.-I.
发表日期	2020
ISSN	0277-3791
卷号	248
英文摘要	Past and ongoing precipitations of Mn-carbonate (rhodochrosite) have occurred in the freshwater Lake Ohnuma, which is situated about 8 km south of the Hokkaido-Komagatake volcano, southwest Hokkaido (northern Japan). Lake sediments from a surface and a longer ∼4 m core contain the sedimentary rhythms of rhodochrosite laminae and volcanic deposits which were identified by nondestructive micro-XRF fluorescence analyses. The three tephra ash layers from the Hokkaido-Komagatake volcano, characterized by peaks of Al, Si, K, Ca, and Ti, correspond to regionally recognized tephras (1640, 1929 and 1996 CE) based on ashfall isopachs and 137Cs, 210Pb and 14C ages determined from the two cores. The sedimentation rate showed a drastic change around 1929 CE; ∼0.3 cm/yr for 1640–1929 CE and ∼2.7 cm/yr for 1929–2012 CE. The Mn content record of Lake Ohnuma sediments, composed of rhodochrosite laminae, showed a periodic variation with a decadal–centennial scale over the interval 1640–2012 CE. Sediment petrography and hydrochemical measurements suggest that the metastable phase of rhodochrosite was deposited during summer after being precipitated, followed by the crystal growth of rhodochrosite within the anoxic sediments. On the basis of these results, high Mn content is interpreted as an indicator of strengthened summer stratification associated with reduced rainfall runoff. The Ti/Si ratios are representative of the relative abundance of detrital inputs from the watershed. The combined signals of elevated Mn content and Ti/Si ratio for 1935–2012 CE indicate eutrophication and hypoxia in the lake and enhanced land erosion in the watershed, associated with the post-1970s intensive land use such as livestock farming. For 1640–1935 CE, the Lake Ohnuma record shows an antiphase relationship between the Mn content and Ti/Si ratio, which implies that the detrital inputs reflected the strength of the East Asian summer monsoon (EASM), and the reduced rainfall runoff resulted in weaker mixing, followed by depleted O2 in the water column. The antiphase variation in Mn content and Ti/Si ratio suggest weak EASM during the Little Ice Age (∼1850 CE), followed by strong EASM between 1860 and 1929 CE. © 2020 Elsevier Ltd
英文关键词	Late Holocene; Manganese; Micro-XRF; Rainfall; Rhodochrosite lamina; Tephra
语种	英语
scopus关键词	Agriculture; Atmospheric thermodynamics; Eutrophication; Fluorescence; Lakes; Land use; Manganese compounds; Manganese removal (water treatment); Rain; Runoff; Sedimentology; Silicon; Volcanoes; Watersheds; East Asian summer monsoon; Fluorescence analysis; Hydrochemical measurement; Intensive land use; Periodic variation; Relative abundance; Sedimentation rates; Volcanic deposits; Anoxic sediments; carbonate; detection method; human activity; hydrochemistry; lacustrine environment; Little Ice Age; monsoon; precipitation (chemistry); rainfall-runoff modeling; stratification; summer; volcano; Far East; Hokkaido; Japan
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151269
作者单位	Faculty of Education, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan; Hokkaido University of Education, Hakodate Campus, Hachiman-cho 1-2, Hakodate, Hokkaido 040-8567, Japan; Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, O24, Wake, Nomi, Ishikawa 923-1224, Japan; Horonobe Research Institute for the Subsurface Environment, 5-3 Sakaemachi, Horonobe-cho, Teshio-gun, Hokkaido 098-3221, Japan; Tono Geoscience Center, Japan Atomic Energy Agency, 959-31 Jorinji, Izumi-cho, Toki, Gifu, 509-5102, Japan; Faculty of Science and Technology, Kochi University, 2-5-1 Akebono-cho, Kochi, 780-8520, Japan; Earth Life Science Institute, Tokyo Institute of Technology, 2-12-1-IE-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan; Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, 237-0061, Japan; Center for Advanced Marine Core Research, Kochi University, B200 Monobe, Nankoku, 783-8502, Japa...
推荐引用方式 GB/T 7714	Katsuta N.,Naito S.,Ikeda H.,et al. Sedimentary rhythm of Mn-carbonate laminae induced by East Asian summer monsoon variability and human activity in Lake Ohnuma; southwest Hokkaido; northern Japan[J],2020,248.
APA	Katsuta N..,Naito S..,Ikeda H..,Tanaka K..,Murakami T..,...&Kawakami S.-I..(2020).Sedimentary rhythm of Mn-carbonate laminae induced by East Asian summer monsoon variability and human activity in Lake Ohnuma; southwest Hokkaido; northern Japan.Quaternary Science Reviews,248.
MLA	Katsuta N.,et al."Sedimentary rhythm of Mn-carbonate laminae induced by East Asian summer monsoon variability and human activity in Lake Ohnuma; southwest Hokkaido; northern Japan".Quaternary Science Reviews 248(2020).