Affiliation
Graduate School of Science and Technology Research Division
KAJITA HIROTO
Degree
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博士（理学）
Research Interests
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生物地球化学
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Limnology
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Geochemistry
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Paleoclimatology&Paleoceanography
Professional Memberships
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日本地質学会
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Paleo-sciences Society
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Geochemical Society of Japan
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Japan Geoscience Union
Papers
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Historical trend of polycyclic aromatic hydrocarbons in a sediment core from Osaka Bay during the Meghalayan
Kai Nils Nitzsche, Naoto F Ishikawa, Toshihiro Yoshimura, Hiroto Kajita, Hodaka Kawahata, Nanako O Ogawa, Hisami Suga, Naohiko Ohkouchi
The Holocene 34 ( 7 ) 860 - 869 2024.3
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Development of under-ice topography survey method using a small-scaled Remotely Operated Vehicle (ROV)
Ishiwa Takeshige, Yamagata Hirokazu, Suganuma Yusuke, Shibata Daisuke, Kajita Hiroto, Maki Toshihiro
The Journal of the Geological Society of Japan 129 ( 1 ) 567 - 571 2023.11
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Climatic change around the 4.2 ka event in coastal areas of the East China Sea and its potential influence on prehistoric Japanese people
Hiroto Kajita, Yuta Isaji, Rintaro Kato, Yoko Nishikura, Masafumi Murayama, Naohiko Ohkouchi, Shouye Yang, Hongbo Zheng, Ke Wang, Toshimichi Nakanishi, Takenori Sasak, Ayumi Maeda, Atsushi Suzuki, Toshiro Yamanaka, Hodaka Kawahata
Palaeogeography, Palaeoclimatology, Palaeoecology 609 ( 111310 ) 111310 - 111310 2023.1
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[Invited] Alkenone paleotemperature reconstructions in the Plio-Pleistocene sedimentary sequence around the Boso Peninsula.
Kajita Hiroto
Annual Meeting of the Geological Society of Japan 2023 ( 0 ) 178 2023
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[Invited] Alkenone paleotemperature reconstructions in the Plio-Pleistocene sedimentary sequence around the Boso Peninsula.
Kajita Hiroto
Annual Meeting of the Geological Society of Japan 2023 ( 0 ) 178 2023
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Metal contamination in a sediment core from Osaka Bay during the last 400 years
Kai Nils Nitzsche, Toshihiro Yoshimura, Naoto F. Ishikawa, Hiroto Kajita, Hodaka Kawahata, Nanako O. Ogawa, Katsuhiko Suzuki, Yusuke Yokoyama, Naohiko Ohkouchi
Progress in Earth and Planetary Science 9 ( 1 ) 2022.10
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Long-chain alkenones in the Shimosa Group reveal palaeotemperatures of the Pleistocene interglacial Palaeo-Tokyo Bays
Hiroto Kajita, Tsutomu Nakazawa, Masayuki Utsunomiya, Naohiko Ohkouchi, Miyako Sato, Naomi Harada, Hodaka Kawahata
Progress in Earth and Planetary Science 9 ( 1 ) 2022.7
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Biomarkers in the rock outcrop of the Kazusa Group reveal palaeoenvironments of the Kuroshio region (Jul, 10.1038/s43247-021-00154-2, 2021)
Kajita, H; Maeda, A; Utsunomiya, M; Yoshimura, T; Ohkouchi, N; Suzuki, A; Kawahata, H
COMMUNICATIONS EARTH & ENVIRONMENT 2 ( 1 ) 2021.7
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アルケノン古水温計の新展開―沿岸・湖沼堆積物と堆積岩への適用―
梶田展人
地球化学 55 ( 2 ) 59 - 60 2021.6
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Biomarkers in the rock outcrop of the Kazusa Group reveal palaeoenvironments of the Kuroshio region
Hiroto Kajita, Ayumi Maeda, Masayuki Utsunomiya, Toshihiro Yoshimura, Naohiko Ohkouchi, Atsushi Suzuki, Hodaka Kawahata
Communications Earth & Environment 2 ( 1 ) 2021.5
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The influence and impact of tsunamis on the microorganism assembly of Nagatsura-Ura Lagoon, Miyagi, northeastern Japan
Yutaka Okumura, Hiromi Matsuoka, Hisayuki Arakawa, Fuyuki Tokanai, Atsushi Suzuki, Toshiaki Irizuki, Hiroto Kajita, Motoyuki Hara
Fisheries Science 87 ( 1 ) 121 - 130 2021.1
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Seasonal and Spatial Variations of Chemical Weathering in the Mekong Basin: From the Headwaters to the Lower Reaches
Hiroto Kajita, Yuki Ota, Toshihiro Yoshimura, Daisuke Araoka, Takuya Manaka, Ouyang Ziyu, Shinya Iwasaki, Takuya Yanase, Akihiko Inamura, Etsuo Uchida, Hongbo Zheng, Qing Yang, Ke Wang, Atsushi Suzuki, Hodaka Kawahata
Aquatic Geochemistry 26 ( 2 ) 137 - 159 2020.6
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Diversity of long-chain alkenone producers ̶Developments of temperature proxy in inland waters̶
Hiroto Kajita, Hideto Nakamura
Geochemistry 54 ( 2 ) 79 - 96 2020.6
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Genomic and geochemical identification of the long-chain alkenone producer in the estuarine Lake Takahoko, Japan: Implications for temperature reconstructions
Hiroto Kajita, Hideto Nakamura, Naohiko Ohkouchi, Naomi Harada, Miyako Sato, Shun Tokioka, Hodaka Kawahata
Organic Geochemistry 142 103980 2020.4
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High time-resolution alkenone paleotemperature variations in Tokyo Bay during the Meghalayan: Implications for cold climates and social unrest in Japan
Hiroto Kajita, Naomi Harada, Yusuke Yokoyama, Miyako Sato, Nanako Ogawa, Yosuke Miyairi, Chikako Sawada, Atsushi Suzuki, Hodaka Kawahata
Quaternary Science Reviews 230 2020.2
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Climate variations and Changes in Chinese history
Hiroto Kajita
The Archaeological Journal 723 32 - 33 2019.3
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Extraordinary cold episodes during the mid-Holocene in the Yangtze delta: Interruption of the earliest rice cultivating civilization
Hiroto Kajita, Hodaka Kawahata, Ke Wang, Hongbo Zheng, Shouye Yang, Naohiko Ohkouchi, Masayuki Utsunomiya, Bin Zhou, Bang Zheng
Quaternary Science Reviews 201 418 - 428 2018.12
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Paleo-climate reconstruction using corals from Kikai Island, Japan
Hiroto Kajita, Atsuko Yamazaki, Saori Ito, Tsuyoshi Watanabe
Kaiyo Monthly 60 55 - 62 2017.6
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Holocene sea surface temperature variations recorded in corals from Kikai Island, Japan
Hiroto Kajita, Atsuko Yamazaki, Takaaki Watanabe, Chung Che Wu, Chuan Chou Shen, Tsuyoshi Watanabe
Geochemical Journal 51 ( 4 ) e9 - e14 2017
Review Papers
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東南極宗谷海岸沿岸およびシューマッハオアシスの陸水系に存在する脂肪酸の組成
梶田 展人, 菅沼 悠介, 工藤 栄, 杉山 慎, 大河内 直彦
日本地質学会学術大会講演要旨集 2023.4
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千葉複合セクションのn-アルカン分析による海洋酸素同位体ステージ19の陸上気候・植生変動復元
梶田 展人, 関 宰, 山本 正伸, 大河内 直彦, 岡田 誠, 羽田 裕貴, 菅沼 悠介
日本地球化学会第69回年会講演要旨集 2022.11
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Zinc stable isotopes as tracers for Zn pollution in sediment cores from historically polluted Lake Biwa and Osaka Bay
Kai Nitzsche, Toshihiro Yoshimura, Naoto Ishikawa, Hiroto Kajita, Nanako Ogawa, Katz Suzuki, Naohiko Ohkouchi
Goldschmidt2022 abstracts 2022.1
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下総層群に含まれるアルケノンを用いた古東京湾の古水温復元
梶田 展人, 中澤 努, 大河内 直彦, 佐藤 都, 原田 尚美, 川幡 穂高
日本地球化学会第68回年会講演要旨集 2021.12
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Application of the alkenone paleotemperature reconstruction in Lake Takahoko, Aomori
Hiroto Kajita, Hideto Nakamura, Naohiko Ohkouchi, Naomi Harada, Miyako Sato, Shinji Ueda, Hodaka Kawahata
Abstracts of Annual Meeting of the Geochemical Society of Japan 77 2021.1
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Alkenones synthesized by Isochrydaceae family haptophytes -Case studies in domestic lakes-
Kajita Hiroto, Nakamura Hideto, Kawahata Hodaka
Abstracts of Annual Meeting of the Geochemical Society of Japan 66 ( 0 ) 48 - 48 2019.11
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Large cold events induced by El Nino episodes in Funka Bay, northern Japan
Hodaka Kawahata, Yoshiki Hatta, Hiroto Kajita, Yuki Ota, Kenji Nishida, Masayuki Ikeda, Junko Habu
Annual Meeting of the Geological Society of Japan 2018 ( 0 ) 314 - 314 2018
Awards
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PEPS論文賞
2024.03
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奨励賞
2023.06
Social Activities
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研究者の南極放浪記
2023.11.27
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化石の分析を通して46億年に及ぶ地球の履歴書を書く
2023.10.23
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南極から解き明かす地球環境変動
2023.08.08
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南極沿岸域の地質調査から明らかにする 南極氷床変動史
2023.07.27
Media Coverage
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過去の地球環境の復元
2023.12.04
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「津軽いじん伝」
2023.06.13
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南極の試料1トン分析へ／弘大・梶田助教
2023.05.08
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過去の気候変動を記録する藻類を青森県鷹架沼で発見！ – 湖沼堆積物から湖水温を推定する
2020.06
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関東の気温変化再現 東京湾堆積物を分析
2020.03
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研究室の扉「水稲文明を滅ぼしたのは、、、」
2019.01
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失われた長江新石器文明の謎 – 約4200年前の気候変動を海洋堆積物から復元する
2018.12
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東大、約4400年前～3800年前に大規模かつ複数回の急激な気候寒冷化イベントの発生を発見
2018.12