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Journal Articles

Influence of atmospheric deposition and climate change on lake eutrophication and environment in Lake Buir (eastern Mongolia) over the last century

Itayama, Yui*; Davaasuren, D.*; Ochiai, Shinya*; Minami, Masayo*; Masuki, Yuma*; Yoshimizu, Chikage*; Uchida, Mao; Niwa, Masakazu; Tayasu, Ichiro*; Nagao, Seiya*; et al.

Catena, 258, p.109297_1 - 109297_11, 2025/10

https://doi.org/10.1016/j.catena.2025.109297

Times Cited Count：0

Journal Articles

Heterogeneity effects in micro-beam XRF scanning spectroscopy of binary powdered mixtures and lake sediments

Katsuta, Nagayoshi*; Umemura, Ayako*; Naito, Sayuri*; Masuki, Yuma*; Itayama, Yui*; Niwa, Masakazu; Shirono, Shinichi*; Yoshida, Hidekazu*; Kawakami, Shinichi*

Spectrochimica Acta, Part B, 210, p.106817_1 - 106817_11, 2023/12

https://doi.org/10.1016/j.sab.2023.106817

Times Cited Count：1 Percentile：17.15(Spectroscopy)

X-ray fluorescence (XRF) scanning of lacustrine sediments has been used to extend the approach to a wider range of elemental records in both ages and timescales of variations in past environments and climates. However, one of severe problems with effects of the XRF intensity by grain size and mineralogical composition known as "heterogeneity effects" have been pointed out. This study investigated the heterogeneity effect of Fe intensities on X-ray beam using several binary powder mixtures and lacustrine sediment cores.

Oral presentation

Origine and depositional process of arsenic in lacustrine sediments of Ane River, inferred from the stable isotope ratios and organic elements compositions

Masuki, Yuma*; Itayama, Yui*; Minami, Masayo*; Niwa, Masakazu; Yoshimizu, Chikage*; Tayasu, Ichiro*; Katsuta, Nagayoshi*

no journal, ,

In this presentation, we report origin and depositional process of arsenic in lacustrine sediments of Ane River, inferred from the stable isotope ratios and organic elements compositions.

Oral presentation

Environmental changes over the last 89 years using Buir lake sediments in eastern Mongolian Plateau

Itayama, Yui*; Masuki, Yuma*; Minami, Masayo*; Ochiai, Shinya*; Yoshimizu, Chikage*; Tayasu, Ichiro*; Niwa, Masakazu; Katsuta, Nagayoshi*

no journal, ,

In this presentation, we report the environmental changes using Buir lake sediments in eastern Mongolian Plateau.

Oral presentation

Paleoenvironmental analyses of Lake Baikal sediments since the last interglacial period based on the reestablished age model

Itayama, Yui*; Murakami, Takuma*; Fujita, Natsuko; Kagami, Saya; Kida, Fukuka; Ochiai, Shinya*; Niwa, Masakazu; Katsuta, Nagayoshi*

no journal, ,

Lake Baikal in southeast Siberia is the most sensitive area on Earth which has been responded to changes in solar insolation. In this poster presentation, we report the results of paleoenvironment analyses of the 140 kyrs records after reestablishing the sediment chronology.

Oral presentation

Paleoenvironment variations in southern Lake Baikal during the 150 kyrs using the lake sediment cores

Itayama, Yui*; Hayano, Asuka*; Kamegai, Yushi*; Yasuda, Shiori*; Murakami, Takuma*; Ochiai, Shinya*; Niwa, Masakazu; Katsuta, Nagayoshi*

no journal, ,

In this presentation, we report paleo-environmental changes in the southern region of Lake Baikal by chemical and grain-size analyses for the lake sediment cores.