修士課程＆博士課程修了！

こんにちは！M2の今宮です。

この度、D3の根本さんが博士課程を修了し 博士 (理学) を取得しました！

おめでとうございます！！！！！

また、M2の田畑くん、今宮は 修士 (理学) を取得しました！

おめでとうございます！！！！（ありがとうございます）

それぞれの新天地でのご活躍をお祈り申し上げます～～

New Papers (Elsevier, etc.) 2025/12/16–2025/12/22

Chemical Geology
N/A

Earth and Planetary Science Letters

[1] Coral-inferred high seasonal sea surface temperature in the South China Sea at 7.4 thousand years ago

Shichen Tao, Kam-biu Liu, Hongqiang Yan, Min Meng, Chun-Yuan Huang, Chuan-Chou Shen, Huiling Zhang, Kefu Yu, Qi Shi

[2] Increased rainfall in southern Central America under glacial climate conditions

Elise Luciani, Guillaume Leduc, Yannick Garcin, Frauke Rostek, Kazuyo Tachikawa, Marta Garcia, Masa Kageyama, Edouard Bard

Geochimica et Cosmochimica Acta

N/A

Global and Planetary Change

[3] The prolonged weak monsoon event in East Asia and the interhemispheric seesaw: implications for persistent AMOC forcing at the mid-late Holocene transition

Li, M., Zhang, W., Chen, S., Chen, J., Wang, Y., Shao, Q., & Wang, Y.

[4] The variation of the East Asian summer monsoon on multi-centennial scale during 8.3–2.9 ka BP

Chen, C. J., Dong, Y. X., Wu, Y., Zhang, J., Wang, H. B., Xue, Y. X., ... & Li, T. Y.

[5] The coupling between monsoon rainfall and sea surface temperature in the subtropical South Atlantic during the Last Glacial period

Vasconcelos, L. C., Cruz, F. W., Bernal, J. P., Campos, M. C., Piacsek, P., Campos, J. L., ... & Cheng, H.

[6] Indian summer monsoon variability across the last 9000 years: New evidence from stalagmites of southwestern China

Li, Y., Huang, C., Lan, J., Kemp, D. B., Ogg, J. G., Sinha, A., ... & Tan, L.

[7] Two-phased ITCZ-driven upper salinity stratification in the western equatorial Atlantic during Heinrich Stadial 11

Campos, M. C., Nascimento, R. A., Pinho, T. M., Kraft, L., Crivellari, S., Radionovskaya, S., ... & Chiessi, C. M. 

[8] Joint influences of ENSO and East Asian winter monsoon on the Hadley circulation in the Asian monsoon domain

Du, M., Li, Y., Feng, J., Wen, Q., Song, W., & Wang, Z. 

Marine Geology

[9] The impact of mangroves development and morphodynamics on channel function shift and flow asymmetry in an estuarine channel-shoal system

Rahdarian, A., Bryan, K. R., & Van Der Wegen, M.

Palaeogeography, Paleoclimatology, Paleoecology

[10] Paleoceanographic evolution of surface and bottom waters at the Conrad Rise in the Indian sector of the Southern Ocean since the Last Glacial Maximum

Khim, B. K., Ikehara, M., & Yang, J.

Quaternary Geochronology

N/A

Quaternary International

[11] Japan sea surface paleoceanography and productivity variations through the Middle Pleistocene Transition

Sahoo, B., Samal, S., Murmu, B., Das, M., Das, S. K., Datta, S., ... & Singh, R. K.

[12] Hydroclimatic change over the last 2000 years in arid Xinjiang of northwest China and its role in human societies along the ancient Silk Road

Yan, A., Liu, H., Liu, X., Yang, Z., Bai, Z., Tian, Q., ... & Song, Y. 

Quaternary Research

N/A

New Papers (AGU, etc.) 2025/12/1–2025/12/8

 〈AGU〉
Geochemistry, Geophysics, Geosystems

N/A

Geophysical Research Letters

[1] Asymmetric impacts of extreme positive and negative Indian Ocean Dipole events on late-summer monsoon rainfall in Western South Asia

Xie, M., Wang, J.-Z., Fan, H., Zhang, L., & Chen, Z.

[2] Seismogenic thickening in the Pamir Plateau from craton underthrusting revealed by the 2023 Mw 6.9 earthquake

Liu, Q., Zhang, Y., Ma, Z., Zilio, L. D., Zhang, G., Li, H., & Shan, X.

[3] Sea-surface temperature patterns, radiative cooling, and hydrological sensitivity

Williams, A. I. L., & Jeevanjee, N.

[4] Local Sea Surface Temperatures Modulate the Occurrence of Heavy Rainfall Events in the Galápagos Archipelago

Schneider, M. K., Turini, N., Ballari, D., López, S. D. B., Maldonaldo, B. D., Orellana-Alvear, J., et al.

Journal of Geophysical Research C. Oceans

[5] Slowdown of subsurface freshening in the Southwest Pacific Ocean since 1990

Zhang, J., Zhang, X., King, M. A., & Lyu, K.

[6] Sources and paths of the lower branch of the abyssal overturning circulation

Yang, X., Cessi, P., & Blanke, B.

[7] Interannual variations of Wintertime mixed layer depth in the northern South China Sea

Wang, Y., & Lan, J.

Paleoceanography and Paleoclimatology

[8] Antarctic intermediate water variability in the South Atlantic over the last 600,000 years

Soaga, O., Hathorne, E., Frank, M., Tselykh, P., Jebasinski, L., & Nürnberg, D.

[9] Enhanced intermediate-depth nutrient import to the late last interglacial Atlantic

Sipp-Alpers, I., Lynch-Stieglitz, J., Vollmer, T., & Marchitto, T.

[10] Thermal and non-thermal controls on benthic foraminiferal Mg/Ca, Sr/Ca, B/Ca, and Mg/Li: Global core-top compilation, revised calibrations, and application to the geologic record

Nauter-Alves, A., Evans, D., Katz, M. E., Gray, W. R., Rae, J. W. B., & Borrelli, C.

〈EGU〉

Climate of the Past

[11] Insights into the Middle–Late Miocene palaeoceanographic development of Cyprus (eastern Mediterranean) from a new δ18O and δ13C stable isotope composite record

Cannings, T., Robertson, A. H. F., and Kroon, D.

[12] Penultimate glacial sea surface temperature and hydrologic variability in the tropical South Pacific from 150 ka Tahiti corals

Asami, R., Felis, T., Shinjo, R., Murayama, M., and Iryu, Y.

[13] Atmospheric pressure and anemological conditions in south-western Greenland in the second half of the 18th century

Chmist, K., Singh, G., Araźny, A., Przybylak, R., and Wyszyński, P.

[14] Reconstruction of winter temperature of southwest China over the past 300 years based on a Bayesian approach

Chen, S. and Brönnimann, S.

[15] Photic zone niche partitioning, stratification, and carbon cycling in the tropical Indian Ocean during the Piacenzian

Tangunan, D. N., Hall, I. R., Beaufort, L., Berke, M. A., Nederbragt, A., and Bown, P. R.

[16] Distinct winter North Atlantic climate responses to tropical and extratropical eruptions over the last millennium in PMIP simulations and reconstructions

Tao, Q., Shen, C., Muscheler, R., and Sjolte, J.

〈GSA〉

Geological Society of America Bulletin

[17] Position-specific carbon isotope compositions of propane as a novel proxy for tracing sealing integrity of shale systems

Dongjun Song, Peng Liu, Juske Horita, Jingyu Zhang, Xiaofeng Wang, Jincai Tuo

[18] Pre-existing thrust fault system influencing overlying pull-apart basin: New insights from the offshore Bohai Bay Basin of eastern China

Tao Ye, Anqing Chen, Chengming Niu, Jian Luo, Mingcai Hou

[19] Transform fault system: A microplate-based perspective on transform faults

Sanzhong Li, Yong-Fei Zheng, Yanhui Suo

UH-AORI Symposium

Some members of Yokoyama lab participated in the Hawaii–AORI Symposium held from October 7 to 10.

Yusuke and Shoko gave oral presentations, while Bethany, Miya, and Shunsuke presented posters.

At the icebreaker dinner on the 7th, we had lively conversations with many professors and students over delicious Italian food and wine. Miya even found a new collaborator interested in analyzing the intestines of her abalone shells.

🍕めっちゃうまい！

On the 8th and 9th, a series of oral and poster sessions took place at AORI. The topics were diverse and covered various aspects of marine science, though less focused on geology this time.

During the banquet on the 8th, we enjoyed an excellent buffet. It was a great chance to reconnect with familiar faces (for the professors), make new friends, and chat about science, hobbies, and sports.

The final day was left open for lab visits and informal seminars. Our lab was delighted to host Steven, Sara, and Samuel, who shared their research with us. We also presented our own work and had engaging discussions afterward. Later, Steven expressed interest in visiting the community garden Miya has been working on, so she brought him, Sara, Samuel, and Yahagi-sensei to see her “secret garden.”

Overall, it was a fun and fruitful week full of scientific exchange, casual conversations, delicious food, and both old and new friendships.

 

New Papers (AGU, etc.) 2025/10/14–2025/10/20

 〈AGU〉

Geochemistry, Geophysics, Geosystems

[1] Ice-rafted detritus of the southeast Grand Banks Slope, Newfoundland, throughout Heinrich layers 1 to 5a: 1. Petrology and abundance

Bukar, S., Lisker, F., von Dobeneck, T., Max, L., Wang, Y., Lenz, M., et al.

[2] Ice-rafted detritus of the southeast Grand Banks Slope, Newfoundland, throughout Heinrich layers 1 to 5a: 2. Magnetic properties

Bukar, S., von Dobeneck, T., Wang, Y., Max, L., Frederichs, T., Dallanave, E., & St-Onge, G.

[3] Determination of δ11B in planktonic foraminifera at the ng level: Application to the ontogenetic variability in Globigerina bulloides

Paulhac Buisson, M., Louvat, P., Karancz, S., Tian, R., Raitzsch, M., Bijma, J., & Rollion-Bard, C.

Geophysical Research Letters

[3] Possible mechanisms for the record-breaking persistent extreme rainfall event over southern China in April 2024: Synergistic effects of multiscale systems

Pan, W., Sun, J., & Ma, J.

[4] Apparent changes in Pacific decadal variability caused by anthropogenically induced mean state modulations

Xing, C., Stevenson, S., Di Lorenzo, E., Newman, M., Capotondi, A., Fasullo, J., & Maher, N.

[5] Extratropical cyclones act as a “bridge” to the concurrent impact of ENSO on the Arctic Oscillation during boreal winter

Qian, S., Hu, H., Hodges, K. I., Zhu, Y., Yang, X.-Q., & Wang, Y.

[6] Seesaw shift in sea surface height drives spring decline of the Antarctic Slope Current in the Cosmonaut Sea, East Antarctica

Guo, G., Gao, L., Xu, H., Shi, J., Kong, B., & Sun, Y.

[7] Multi-year ice dynamics at Køge Bugt Central glacier controlled by bed topography

Picton, H. J., & Nienow, P. W.

[8] Tracing diurnal variations of atmospheric CO2, O2, and δ13CO2 over a tropical and a temperate forest

Faassen, K. A. P., González-Armas, R., Koren, G., Adnew, G. A., van Asperen, H., de Boer, H., et al.

[9] Increased carbon sink within the seasonal sea ice zone associated with climate variability in the Southern Ocean

Deng, P., He, S., Zhang, Z., Smith, W. O., Jr., He, J., Lan, M., et al.

[10] Greenland ice core isotope variability strongly influenced by systematic changes in depositional noise

Hirsch, N., Dolman, A. M., Münch, T., & Laepple, T.

[11] Extreme Antarctic sea ice loss facilitated by negative shift of Southern Annular Mode

Chan, A. C., England, M. R., Screen, J. A., Bracegirdle, T. J., Blockley, E. W., & Holmes, C. R.

[12] Increased shortwave radiation dampens summertime SST tendency in mid-latitude oceans under future warming scenarios

Tian, F., & Zhang, R.-H.

Journal of Geophysical Research C. Oceans

[13] Revisiting the Kuroshio frontal eddies in the East China Sea: Insights from the eddy energy budget

Wang, S., Guo, X., Kido, S., Qiao, Y.-X., & Sasaki, H.

[14] Assessing submesoscale sea surface height signals from the SWOT mission

Zhang, X., & Callies, J.

Paleoceanography

[15] Sea ice response to orbital forcing in idealized climate model experiments

O’Neill, G. R., & Broccoli, A. J.

〈EGU〉

Climate of the Past

N/A

〈GSA〉

Geological Society of America Bulletin

N/A

2025年地球化学会年会に行ってきました

こんにちは、横山研D2の阪本です！ 9/17〜9/19に仙台の川内キャンパスにて開催された地球化学会に、横山研からは修士２年の今宮と、阪本、それから横山先生の3人で参加してきました！

地球化学について、学会HPでは以下のように書かれています。

太陽-惑星系の形成と進化、地球内部に存在する物質の構造とその進化、さらには大気圏・水圏を含む地球表層や生命の誕生と進化などを「化学」を用いて探求する学問分野です。地球化学は、元素、同位体、化学種の存在度、分布、移動、変化を空間的あるいは時間的に取り扱い、それらを支配する法則や原理を見つけだすことにより、地球や太陽系の様々な現象の解明を目指しています。隕石や月試料などの地球外物質を対象とする宇宙化学も含めて地球化学と呼びます（地球化学会HP）

ここにあるように、高校理科で言う地学と化学を合わせたような、非常に広い研究対象が扱われています！

川内キャンパス

今宮くんと阪本は、黒田研の太田さんと一緒に学生懇親会にも参加し、同学年の学生と交流しました！二人の発表は1日目に終わり、それぞれ今宮くんはポスター発表、阪本は口頭で発表しました！

阪本（右端）は学生優秀賞をいただきました！
地球惑星科学専攻の学生がなんと4人受賞！

横山先生の発表も最終日にあり、AMSでの研究業績の紹介やPIMSの導入状況などについてお話しされました！！

学会の中日には懇親会も実施され、牛タンやご当地の美味しいお酒をいただきました〜

牛タンなどの美味しい仙台の料理を堪能しました！

帰りの駅弁！

とても充実した3日間でした！！

追記：学会前の週から腰が痛くて整形外科でリハビリを受けたりしていたのですが、学会でたくさん歩いて運動したらだいぶ良くなりました。運動不足は怖いですね。

25th Radiocarbon Conference

 皆さんこんにちは！修士2年の今宮です。

7月にクラクフ (ポーランド) にて開催された「25th Radiocarbon Conference」に参加してきたので様子を紹介します！

「放射性炭素同位体」横山研を知っている方なら耳にしたことがあるはずです。

Radiocarbon Conferenceは放射性炭素同位体を用いた研究をする世界中の研究者が集まる、三年に一度のビッグな学会です。

年代測定に使っている研究や、私のように核実験由来の14Cを見る研究、あるいは犯罪捜査への応用など、14Cにまつわる幅広い研究発表が行われていました。

論文を拝見したことのあるような著名な先生方があちらこちらにいらっしゃって、芸能人を目撃したような気分でした。

AGH University ハリーポッターみたいでカッコイイ

初めてのEU & 初めての英語での発表でかなり緊張しましたが、同じ同位体を見ている、いわば共通の趣味があるような安心感のおかげで、初日のポスター発表では様々な意見交換ができました。

会場で隣同士だった学生とは、夕食を共に食べるほど仲良くなれました！

広場で食べたZapiekanka
ボリューミーなピザパンです

意見交換でいえば、学会期間中は4-5セッションごとにコーヒーブレークがあり、ホテルのスイーツビュッフェをつまみながら休憩できるようになっています。

ランチブレークも含め、1日に結構周りの人と話す場があるのが、日本での学会とは異なるなぁと思いながら参加していました。

コーヒーブレークの様子

また、国際学会といえば懇親会 (banquet) ですね！大学附属のブルワリー (羨ましい) にて、吹奏楽を楽しみながら食事を楽しみ、現地でできた友人と最後の夜を楽しみました。

懇親会後半では、会場内BGMに合わせて踊る人が続出。欧州文化を体験すべく、とりあえず私も参加してみました。練習が必要ですね。

会場のブルワリー

素晴らしい懇親会でした

最後に、クラクフの街並みと料理を紹介します。

クラクフはかつてポーランド王国の首都として栄え、世界で最も歴史のある都市のひとつです。

ホテル周辺は絵のような綺麗な中世の町並みが広がり、広場には馬車まで走っています。

歴史を感じさせる遺産も多く、同時に、かの世界大戦の悲劇を思い起こさせる場所も多く残されています。

ポーランド王宮殿のヴァヴェル城 築1000年です

今回滞在したKazimierz地区はユダヤ人街で、
映画『シンドラーのリスト』の舞台です

ポーランド流餃子のPierogi
食器も可愛いですね

街全体が美しく、料理もおいしく、学びのある場所であるのでぜひまた訪れたいと思います。

、、、、まずは学会誌投稿用の論文執筆に注力します！！！

New Papers (AGU, etc.) 2025/05/13-2025/05/19

Geochemistry, Geophysics, Geosystems

[1] Demise of the Barra Honda carbonate shoal (Costa Rica) at the Paleocene

‐Eocene boundary linked to climate change and forearc tectonics
Andjić, G., Baumgartner‐Mora, C., Baumgartner, P. O., Petrizzo, M. R.,

Vennemann, T., Paul, A. N., & Lorenzo, V.

Geophysical Research Letters

[2] Near‐term future sea‐level projections supported by extrapolation of tide‐gauge observations.

Wang, J., Zhang, X., Church, J. A., King, M., & Chen, X.

[3] Downstream hydrology reduces glaciers' direct contribution to sea‐level rise. 

Rounce, D. R., Hock, R., Prusevich, A. A., Grogan, D. S., Lammers, R. B., Huss, M., ... & Zan, B.

[4] Local drivers of Antarctic spring sea ice retreat. 

Himmich, K., Vancoppenolle, M., Stammerjohn, S., Bocquet, M., Madec, G., & Fleury, S.

[5] SWOT observations over sea ice: A first look.

Kacimi, S., Jaruwatanadilok, S., & Kwok, R.

Journal of Geophysical Research C. Oceans

[6] Impact of rain‐adjusted satellite sea surface salinity on ENSO predictions from the GMAO S2S forecast system.

Hackert, E., Akella, S., Ruiz‐Xomchuk, V., Nakada, K., Jacob, M., Drushka, K., ... & Molod, A. 

[7] Seasonal variations in coral lipids and their significance for energy maintenance in the South China Sea. 

Xu, S., Mo, H., Yu, K., Gao, J., & Men, Z.

[8] Drivers of chlorophyll‐a variability and trends in the Agulhas region: Insights from 25 years of satellite observations.

Prakash, P., Mohan, R., & Luis, A. J. 

[9] Dissolved oxygen isotopes unravel mixing and respiration impacts on coastal oxygen depletion dynamics in the Changjiang Estuary.

Zhou, J., Hu, H., Zhu, Z., Wang, Q., Li, B., & Hou, S.

[10] Interannual variability of the summer surface salinity in the southern South China Sea driven by the summer monsoon. 

Wu, X., Yao, F., & Wang, D.

[11] Impacts of climate modes on interannual mesoscale Eddy variability in the southeastern tropical Indian Ocean.

Zhou, Y., Duan, W., Cheng, X., Yang, C., & Chen, J.

Paleoceanography and Paleoclimatology

[12] Late Pleistocene sediment provenance and paleoenvironmental changes in the East Siberian Shelf margin: Insights from mineralogical and Nd isotope analysis. 

Koo, H. J., Cho, H. G., Rim, H., & Choe, H.

[13] The late Miocene ocean carbon cycle changes: New evidence from the South Atlantic IODP Expeditions. 

Jin, X., Ma, X., Dinarès‐Turell, J., Jiang, X., Ma, W., Du, J., ... & South Atlantic Transect IODP Expeditions 390 & 393 Scientists.

Climate of the Past

[14] Evaluating the 20th Century Reanalysis Version 3 with synoptic typing and an East Antarctic ice core accumulation record. 

Nilssen, M. T., Udy, D. G., & Vance, T. R.

Geological Society of America Bulletin

N/A