Research theme for competitive and other funds (21)：
2024 - 2027 先端的同位体分析手法によって読み解く第四紀の海洋Sr循環ダイナミクス
2022 - 2025 How asymmetric currents in a deep sea channel affect on the land-deep sea materials transport and habitat for benthos?
2021 - 2025 Study on a huge collapse of the Antarctic Ice Sheet during past warmer periods: New insights from Pb isotope analysis
2021 - 2025 氷床融解最前線における鮮新世温暖期南極氷床崩壊イベント検証と地域性解明
2018 - 2023 Water and soil environmental changes and dawn of urban mine around the early cities in Ancient West Asia
2018 - 2021 Marine environments recorded in siliceous microfossil skeletons: species-level analysis of isotopic ratios and minor trace elements
2017 - 2021 Mechanism of significant Antarctic ice sheet collapse events during the Last Interglacial
2018 - 2020 Detection of meltwater events of glaciers and ice sheets using analysis of Ba stable isotopes
2017 - 2020 Impact of deglacial melt of the Cordillera Ice Sheet on the Gulf of Alaska coastal environment: geochemical and molecular biological analyses of marine sediments
2016 - 2019 Pacific meridional overturning circulation since the last glaciation
2015 - 2018 Turning point between green house and ice house earths: investigation of paleothermometry from Cretaceous at Canadian Pacific Coast
2014 - 2018 Early history of NADW: proposal and verification of Pacific inflow hypothesis
2014 - 2017 Mechanism of the late Miocene global cooling driven by decline of CO2
2014 - 2017 Analysis of evolution of the Japan Sea based on neodymium isotopes of fossil fish teeth/debris
2012 - 2017 Decoding Quaternary paleoclimatic changes in West Asia recorded in sediments
2013 - 2016 Evolution of the ocean circulation in the Japan Sea related to global climatic and local tectonic events
2013 - 2016 Traces of the earthquakes and the flood events at archaeological ruins investigated by magnetic study.
2012 - 2015 Contributions to soil formations at Midagahara wetland of the asian dusts on Mt. Tateyama and trends of desertification in the Asian Continent
2011 - 2012 Understanding of "green-house earth" based on environmental reconstruction of the Pliocene warmth
Michael Julian Haryanto, Jing Zhang, Zaskia Alifia, Shigehiro Kagaya, Keiji Horikawa, Roy Andreas. Unveiling method-derived element fractionation in determining seawater REEs using chelating resin and ICP-MS: Enhanced accuracy for finer-scale water mixing. Talanta. 2025
Kenji Matsuzaki, Takuya Itaki, Yoshimi Kubota, Kyung Eun Lee, Isao Motoyama, Takuya Sagawa, Keiji Horikawa, Masafumi Murayama, Hajime Obata. Radiolarian Microfossils as a Tool for Reconstructing Sea Surface Temperature of the past in the Northwest Pacific. 2025
Keiji Horikawa, Masao Iwai, Claus-Dieter Hillenbrand, Christine S. Siddoway, Anna Ruth Halberstadt, Ellen A. Cowan, Michelle L. Penkrot, Karsten Gohl, Julia S. Wellner, Yoshihiro Asahara, et al. Major West Antarctic Ice Sheet retreat events during the Pliocene: Evidence from the sediment provenance analyses of Amundsen Sea IODP U1532 records. 2025
Yi Zhong, Zhengyao Lu, Stefanie Kaboth-Bahr, Jimin Yu, Keiji Horikawa, Mark J. Dekkers, Juan C. Larrasoaña, Peter D. Clift, Michael E. Weber, Flor Vermassen, et al. Precession modulates the poleward expansion of atmospheric circulation to the Arctic Ocean. Nature Communications. 2025
Boo-Keun Khim, Keiji Horikawa, Yoshihiro Asahara. Anomalous eNd change of the Antarctic Intermediate Water in the Pacific sector of the Southern Ocean during the Middle Miocene Climate Transition. 2025
山本正伸, 清家弘治, POLYAK L., GEMERY L., JOE Y.J., 内田翔馬, 小林稔, 小野寺丈尚太郎, 村山雅史, 岩井雅夫, et al. Preliminary results of Late Holocene environmental reconstruction of the western Arctic Ocean. 日本地球化学会年会要旨集(Web). 2023. 70th
