2026 JpGU-AGU Joint Meeting

2026年5月24日から29日まで、千葉・幕張で開催された JpGU-AGU Joint Meeting 2026 に横山研究室のメンバーが参加しました。

会期中、研究室の多くのメンバーが口頭発表やポスター発表を行い、それぞれの研究成果を国内外の研究者の方々に紹介する貴重な機会となりました。また、学会期間中の夜には懇親の場もあり、研究室内外の交流を深めることができました。

全体を通して、とても有意義で実り多い一週間となりました。今後もこのような機会を大切にし、毎年継続して参加していければと思います。

Members of the Yokoyama Laboratory participated in the JpGU-AGU Joint Meeting 2026, held in Makuhari, Chiba, from May 24 to 29, 2026.

During the meeting, many of our lab members gave oral and poster presentations, providing a valuable opportunity to share our research with scientists from Japan and abroad. We also enjoyed several evening gatherings during the conference period, which allowed us to deepen our connections both within and beyond the laboratory.

Overall, it was a very meaningful and fruitful week. We hope to continue taking part in such opportunities every year in the future.

  

1)  ポスター会場の様子
1) View of the poster session venue

2)  カリフォルニア大学バークレー校、台湾科学アカデミー、秋田大（スティーブ）、シンガポール南洋工科大、東大（横山先生）、ケベック大（Jean-Carlos)の写真。幕張駅前にて。
2) Photo taken in front of Makuhari Station with members from the University of California, Berkeley; Academia Sinica, Taiwan; Akita University (Steve); Nanyang Technological University, Singapore; the University of Tokyo (Yokoyama Sensei); and Université du Québec (Jean-Carlos)

3)  新型加速器の前にて。EGU (ヨーロッパ地球科学会）President、AOGS (アジアーオセアニア地球惑星科学会）Secretary、キャンベラ大（オーストラリア）の研究者のラボツアーの際に撮った写真
3) Photo taken in front of the new accelerator during a lab tour with the President of the European Geosciences Union (EGU), the Secretary of the Asia Oceania Geosciences Society (AOGS), and a researcher from the University of Canberra, Australia

4)  横山先生がコンビーナしたユニオンセッションの参加者の一部と研究室メンバーの集合写真
4) Group photo with some participants of the Union Session Yokoyama Sensei convened and members of our laboratory

5)  阪本君のポスター発表の様子
5) Sakamoto’s poster presentation

6)  ベサニーのポスター発表の様子
6) Bethany’s poster presentation

7)  シシの口頭発表の様子
7)  Shish's oral presentation

New Papers (Nature, etc.) 2025/04/21–2026/04/28

PNAS

1. Space-based observation of global increase in urban methane emissions from 2019–2023
E. Whiting,G. Plant,E.A. Kort,I. Aben,K.J. Biener,G. Leguijt, & J.D. Maasakkers

Geology

2. Paleohydraulics of cyclonic storm deposits suggest that the equatorial climate of Earth in the Pennsylvanian was not cold
Paul M. Myrow, Mingxi Hu, Michael P. Lamb

Nature Geoscience

3. Organic pollution found oceanwide
Aron Stubbins

4. A new paradigm for understanding Earth’s marine ice sheets
Olga Sergienko, Marianne Haseloff, Alexander Robel & Duncan Wingham 

5. Deep ocean control of global temperature after net-zero emissions
Yong-Han Lee, Sang-Wook Yeh, Guojian Wang, Se-Yong Song & Soon-Il An 

Nature communications

6. Climate futures require politics
Julia Leininger, Halvard Buhaug, Elisabeth Gilmore, Staffan I. Lindberg, Marina Andrijevic & Elina Brutschin 

Nature Climate Change

7. ENSO shapes salinity regimes and fish migration in the China Seas
Zhixuan Wang, Han Huang, Guizhi Wang, Tangdong Qu, Yue Liu, Xianghui Guo, Shiyun Lei, Jianyu Hu, Jingfang Fan, Jianping Gan, Ling Cao, Xiaosong Chen & Minhan Dai

New Papers (Elsevier, etc.) 2025/03/24–2026/03/31

Chemical Geology

Terrestrial dominance of sedimentary organic carbon sink in the Antarctic Weddell Sea since MIS 5
Yihao Hu, Thomas J. Algeo, Jingteng Guo, Qingyun Nan, Zheng Tang, Zhifang Xiong, Tiegang Li

Tracing arsenic and antimony in mining-impacted environments: New insights from antimony isotopes
Colin Ferrari, Kevin B. White, Carol J. Ptacek, David W. Blowes

Silicon isotope-based assessments of biogenic and dissolved silica content determination in marine sediments
Die Li, Quanchao Cui, Haiyang Liu, Tzu-Hao Huang, Wei-li Hong, Bangqi Hu, Jing Huang, Min Luo, Weidong Sun, Xiaole Sun

Geochimica et Cosmochimica Acta

Ferrous iron input retards denitrification and drives N2O accumulation across salinity gradients
Jianrong Huang, Jingjing Zhao, Sayed Dildar Hussain, Mingxian Han, Jian Yang, Qing Liu, Andreas Kappler, Hongchen Jiang

Soil formation and weathering over the past 60 kyr reconstructed using lithium isotopes from Maar records

Philip A.E. Pogge von Strandmann, Silke Voigt, Ying Zhou, Denis Scholz, Wolfgang Müller, Anthony Dosseto, Frank Sirocko

Quaternary International

Hydroclimatic heterogeneity in Southwest China revealed from trace elements of a Medieval-to-modern stalagmite

Chen-Yi Wang, Jun-Yun Li, Chao-Jun Chen, Jian Zhang, Yao Wu, Ting-Yong Li

New Papers (Elsevier, etc.) 2025/12/02~2025/12/09

Global and Planetary Change

1. Rapid biotic recovery coupling with progressive oceanic oxygenation following Late Ordovician mass extinction

Yuying Zhang, Zhiliang He, Shuangfang Lu, Dianshi Xiao, Guohui Chen

2. Unveiling shallow marine redox context for the first Phanerozoic mass extinction event

Kuizi Li, Qingshan Wang, Ruliang He, Jian Han, Chao Chang

3. Asymmetry of abyssal warming in the Atlantic Ocean

D.I. Frey

Marine Geology

4. Impacts of vegetation replacement on organic carbon burial in coastal wetlands of Sansha Bay, Southeast China

Jianfeng Su, Yijing Wu, Daidu Fan

5. A thousand-year journey of lithification: CT-analysis and radiocarbon dating of algal reef from Central Mediterranean

Pietro Bazzicalupo, Valentina Alice Bracchi, Mara Cipriani, Adriano Guido, ... Daniela Basso

6. 14C dating of tsunami deposits in arid environments: How challenging can it be? The example of La Graciosa, Canary Islands

Raphaël Paris, Franck Lavigne, Christine Hatté, Juan Francisco Betancort, ... Christophe Lécuyer

International Short Course in September

Hello, this is Ryuu!

From September 1 to 6, I joined the International Short Course which is located in Iwate and around the Mt. Fuji in Yamanashi. On this journey, we learned a lot about Geohazard especially tsunami and earthquake. 

In the first few days, we stayed in Kamaishi and Otsuchi. We also visited the town in Otsuchi which was severely affected by the tsunami in 2011. The local government has rebuilt and strengthened the coastal seawall to prevent possible tsunamis in the future. And also AORI's research center in coastal area there. This building has not been rebuilt for many years and the facilities are complete and fine. Btw, I was quite suprised that Prof. Ryoji Sato would play my favourite anime 'PSYCHOPASS' in his lecture in the first day before we head out to Tohoku.

Type 'キハー１１０', Shot at JR Kamaishi Station

Photos along the Sanriku Railway after Tsunami in 2011

Seawall in Otsuchi Town

The sunshines through the clouds, shot at ICRC, AORI

Then we were back to Tokyo and departed to Zushi without stopping (quite tight schedule). We experienced traditonal Japanese food and accommodation that night.

The sunset in Zushi

Dinner at 'KKR Shoteien'

Accommodation that night

In the next day, we visited Fujitsu Research Laboratories and Fujisan World Heritage Center. We learned lots of knowledge about AI, computer, and also the story of Mt. Fuji. And due to the typhoon that two days, we had to postpone the climbing by one day. So we went to Mount Fuji Research Institute next day and had a presentation there. 

Fujitsu Research Laboratories

Fujisan World Heritage Center

Mount Fuji Research Institute

In the last day, we hiked to the crater of the volcano Mt. Hoei. Luckily, the weather that day was quite good so we could see the whole summit of the mountain. It was a fun hiking but also a exhausting one. The climbing road was full of loose stones, so it was very difficult to walk on it.

The crater of the volcano Mt. Hoei

We finally made it!

New papers (Nature, etc.) ~2025/06/02

Nature Geoscience

1) Carbonate weathering enhances nitrogen assimilatory uptake in rivers globally

• Hongkai Qi, 
• Yi Liu, 
• Haoran Wang, 
• Xingxing Kuang, 
• Aditya Nugraha Putra, 
• Jiu Jimmy Jiao & 
• Jianping Gan 
  

• 2)

Semi-continuous release of Cordilleran Ice Sheet meltwater between 20,000 and 17,000 years ago

• Paul S. Wilcox, 
• Michael C. Meyer & 
• Daniela Festi 
  

• Nature

3) Past warm intervals inform the future South Asian summer monsoon

• • Linqiang He, 
  • Tianjun Zhou & 
  • Zhun Guo 
    
  • PNAS
  4) Mass-independent fractionation of oxygen isotopes during high-temperature condensation in cosmochemical plasmas
  •  Nathan Asset, Marc Chaussidon, Guillaume Lombardi, Johan Villeneuve, Romain Tartèse, Smail Mostefaoui & François Robert
  •   Geology
  • 5) The Neoproterozoic glacial broom 
  •   C.L. Kirkland, 
    R.A. Strachan, 
    D.B. Archibald, 
    J.B. Murphy
  • 6) Wetland methane feedback during the early Eocene hyperthermals
  •   Zuoling Chen, 
    Peizong Lü, 
    Zihua Tang, 
    Shiling Yang, 
    Xu Wang, 
    Linlin Cui, 
    Linhao Fang, 
    Zhongli Ding
  •   Nature Communications
  • 7) 
    Regional restructuring in planktic foraminifera communities through Pliocene-early Pleistocene climate variability
  •   Ekaterina Larina, 
  • Adam Woodhouse, 
  • Anshuman Swain, 
  • Christopher M. Lowery, 
  • Rowan C. Martindale & 
  • Corinne E. Myers 
    8) 
  Dominant control of temperature on (sub-)tropical soil carbon turnover
  
  •   Vera D. Meyer, 
  • Peter Köhler, 
  • Nadine T. Smit, 
  • Julius S. Lipp, 
  • Bingbing Wei, 
  • Gesine Mollenhauer & 
  • Enno Schefuß
    
  Nature Climate Change
  9) Irreversible glacier change and trough water for centuries after overshooting 1.5 °C
  
  •   Lilian Schuster, 
  • Fabien Maussion, 
  • David R. Rounce, 
  • Lizz Ultee, 
  • Patrick Schmitt, 
  • Fabrice Lacroix, 
  • Thomas L. Frölicher & 
  • Carl-Friedrich Schleussner
  
  

  •   Nature Scientific Reports

  • 10) Isotope analysis reveals the relevance of local wild plants in diet and maize as an exotic commodity in pre-Hispanic Patagonia
  •   Alejandro Serna, 
  • Luciano Prates, 
  • Lucio González Venanzi, 
  • Daniela Saghessi, 
  • Emiliano Mange, 
  • Victoria Romano, 
  • Javier A. Montalvo-Cabrera & 
  • Domingo C. Salazar-García 
    11) Identification of fire severity in peat deposits using carbon and nitrogen isotopes

    •   Aulia A. Patria, 
    • Stephen P. Obrochta, 
    • Toshihiro Miyajima, 
    • Bethany C. Behrens & 
    • Ferian Anggara
      
        ScienceAdvances
      
      12)

    Decreasing importance of carbon-climate feedbacks in the Southern Ocean in a warming climate
    

    
      Tereza Jarníková, Corinne Le Quéré, Steven Rumbold & Colin Jones

    
    

• 
  

Amami Symposium - Short Report

Hi! This is Ryuu!

I joined the Amami Symposium in November. This was my first time attending the Amami Symposium and my first visit to the Kagoshima area. We first flew to Kagoshima airport and stayed there overnight before flying to Amami the next morning.

On the way to Amami from Kagashima Airport

The local climate is warm and humid, making me feel like I'm back home. It's also worth mentioning that the lush greenery of subtropical plants against the evening sunsets along the coastline is also a delight!

Asani Beach on Amami Island

The sunset near Amami City Ohama Seaside Park

During the symposium, I listened to many researchers as well as professors presenting, and I had a lot of feelings. One of the things that struck me was the concept of locally-centered cooperation between industry, schools, government, and local people, which was introduced in the symposium. I think events such as these will benefit multiple parties. In addition to that, I've also heard that this symposium is the first time that local high school students have been included in the program. This will also help local students broaden their horizons and stimulate their research interests.

Amami Symposium site

As a graduate student at the University of Tokyo, I'm currently studying the specific causes of the northward shift of the Kuroshio-Kuroshio mixing zone by tracking the dynamics of the ocean currents through carbon 14. This study is also closely related to Amami, which is located in the Kuroshio basin. I hope to interact more closely with the local community in my research in the future.

That's all about my trip to Amami Symposium this time. Thanks for your time reading this blog!

New papers, Elsevier

 Chemical Geology

1.Silicon isotopes reveal the impact of fjordic processes on the transport of reactive silicon from glaciers to coastal regions

Tong Wang a,* , Hong Chin Ng a,b , Jade E. Hatton c , Samantha J. Hammond d , E. Malcolm S. Woodward e , Lorenz Meire f,g , Katharine R. Hendry a,h

2.Predominant biogenic contribution of dissolved inorganic carbon in karst rivers, Southwest China

Yue Zheng a , Hu Ding a,b,* , Jun Zhong a , Yunchao Lang a , Si-Liang Li a , Sheng Xu a,* , Cong-Qiang Liu a

New Papers (Nature etc.) May 14 - 20, 2024

Nature Scientific Reports

1.Unravelling social status in the first medieval military order of the Iberian Peninsula using isotope analysis-Patxi Pérez‑Ramallo, Carme Rissech, Lluis Lloveras, Mary Lucas, Dionisio Urbina, Catalina Urquijo, and Patrick Roberts

2.First insights into the age of the giant ice deposits in the Eisriesenwelt cave (Austria)-Christoph Spötl, Jens Fohlmeister, Paula Reimer & Haiwei Zhang

3.Microplastics and non‑natural cellulosic particles in Spanish bottled drinking water-VirginiaGálvez‑Blanca, Carlos Edo, MiguelGonzález‑Pleiter, Francisca Fernández‑Piñas, Francisco Leganés & Roberto Rosal

4.Deep ocean hydrographic variability estimated from distributed geodetic sensor arrays of northern Chile-Anna Jegen, Dietrich Lange, Johannes Karstensen, Oscar Pizarro & Heidrun Kopp

ScienceAdvances

5.Changes in monsoon precipitation in East Asia under a 2°C interglacial warming-Xinbo Gao, Qingzhen Hao, Luo Wang, Yang Song, Junyi Ge, Haibin Wu, Bing Xu, Long Han, Yu Fu, Xuechao Wu, Chenglong Deng, Zhengtang Guo

Nature Communications

6.Ammonium-derived nitrous oxide is a global source in streams-Shanyun Wang, Bangrui Lan, Longbin Yu, Manyi Xiao, Liping Jiang, Yu Qin, Yucheng Jin, Yuting Zhou , Gawhar Armanbek, Jingchen Ma, Manting Wang, Mike S. M. Jetten, Hangin Tian, Guibing Zhu & Yong-Guan Zhu

Geology

7.Oligocene and Miocene blowtorch volcanism within the California Borderland and its influence on the plate-boundary transition-Andrea Balbas, Kevin Konrad, Nathan Onderdonk, Paterno R. Castillo, and Richard Behl

PNAS

8.The effects of bathymetry on the long-term carbon cycle and CCD-Matthew Bogumila, Tushar Mittalb, and Carolina Lithgow-Bertellonia