Lunchtime Special Lecture

World renowned scientists will present a series of Special Lectures in Earth and planetary sciences for students and early-career researchers across disciplines during lunch breaks of the Meeting. This time, the lectures from the 5 sections will give a talk.

Date and time	13:00-13:40
Place	Stage Area at Exhibition Hall / Zoom
How to join	All attendees are welcome to attend. On-site participation: Please come directly to the local venue. Online participation: Please access the "Lunchtime Special Lectures" on the timetable on the Meeting Website and join the Zoom event. (Zoom link will be provided on 22 May)

Sun. 25 May

Lecturer	Kyoko HAGINO Marine Core Research Institute, Kochi University
Section	Biogeosciences
Title	Discovery of nitroplast in a marine alga Braarudosphaera bigelowii (Prymnesiophyceae)
Outline	Recent study has revealed that Braarudosphaera bigelowii (Prymnesiophyceae) possesses a nitrogen-fixing organelle called nitroplast, which contributes significantly to the marine nitrogen cycle and ecosystem. In this presentation, I will introduce the research background that led to the discovery of nitroplast in B. bigelowii and discuss future challenges for B. bigelowii research.

Mon. 26 May

Lecturer	Tatsuhiro YOKOYAMA Research Institute for Sustainable Humanosphere, Kyoto University
Section	Space and Planetary Sciences
Title	Space Atmosphere and Space Weather
Outline	There is no clear boundary between Earth and space. We call the boundary region "space atmosphere", which can be recognized as both space and atmosphere. The space atmosphere is often disturbed by severe "space weather". Impacts on our social life by various space weather phenomena will be introduced in this lecture.

Tue. 27 May

Lecturer	Ikuko KITABA Research Centre for Palaeoclimatology, Ritsumeikan University
Section	Human Geosciences
Title	Coring lakes across Mexico to uncover the mystery of the Maya civilization: Did climate change drive a great civilization to collapse?
Outline	Why did the Maya civilization decline? To explore this mystery, we cored one lake after another in search of a special type of sediment called “varves.” After three years, we finally found one at an ancient Maya site. These varves recorded time, the weather the Maya experienced, and how they lived. This is a muddy story of chasing facts with hands, feet, and eyes.

Wed. 28 May

Lecturer	Takeshi HORINOUCHI Faculty of Environmental Earth Science, Hokkaido University
Section	Atmospheric and Hydrospheric Sciences
Title	Chasing clouds, studying Venusian atmosphere and tropical cyclones
Outline	We have been using the Venus orbiter “Akatsuki” and the geosynchronous satellites “Himawari” to estimate winds. By using the results, also by using theoretical considerations and numerical modelling, we have been studying the dynamics of the atmosphere of Venus and the Earth. I will talk about its background and what are elucidated on the superrotation of Venusian atmosphere and the variability of tropical cyclones’ inner cores, along with the future prospects.

Thu. 29 May

Lecturer	Yusuke SUGANUMA National Institute of Polar Research
Section	Solid Earth Sciences
Title	Mechanisms of Large-Scale Antarctic Ice Mass Loss and Sea Level Rise: Evidence from Fieldwork in Extreme Environments
Outline	Recent observations document rapid ice mass loss from the Antarctic ice sheet and accelerating sea-level rise, raising concerns for future climate scenarios. However, the mechanisms underlying the extensive mass loss remain poorly constrained, introducing uncertainties in predictive models. We conducted extensive fieldwork in East Antarctica and reconstructed past ice sheet changes to elucidate the retreat mechanisms. In this presentation, we overview the project, present recent findings, and discuss future prospects.

Meet-and-Greet Party 2025

*Click to enlarge

To make it easy for everyone to join, the event will be held in the exhibition hall. Light food and drinks will be provided. We’re planning a casual networking reception in an open space where you can connect across fields. The participation fee is ¥1,100 with advance registration, or ¥2,200 at the same-day registration (¥1,000 for students).

Date and time	Wed. 28 May 19:30-21:00
Place	Stage Area at Exhibition Hall
Participation fee	Early-bird fee: Regular 1,100 JPY (tax included), Students 1,100 JPY (tax included) *Early-bird registration deadline: Tue. 27 May On the day: Regular 2,200 JPY (tax included), Students 1,100 JPY (tax included) *All applications must be made online through the member's page. No cash payment will be accepted on the day of registration.
How to register	Log in to the JpGU Members Page, click the "JpGU Meeting" tab and proceed form the "Party Registration"
How to join	[If you have issued a name badge after the party registration] Please present your name badge and receive a wristband at the reception desk. [If you have issued your name badge before the party registration] Please present a proof of your registration (by showing your membership screen etc.) at the reception desk to receive your wristband.

GeoFut25

Date and time	Monday, 26 May 2025 19:00-21:00
Place	JFA YUME Field
Who can participate	Registered participants of JpGU 2025
Participation fee	Team participation 8,000 yen/team, (+500 yen for the 10th person and after) Individual participation: 1,500 yen/person *Please pay the participation fee on site in cash. *Insurance will be provided by the organizer.
Capacity	Up to 9 teams
How to join	Please apply using the designated application form. Application Form
Application deadkine	Friday, 16 May 17:00

*Please bring indoor shoes as the court is indoors.
*If you have any questions about what to bring or how to participate, please feel free to contact us.
Contact: futsal[at]jpgu.org

Award of GeoSciAI2025

The Japan Geoscience Union and the Japanese Society for Artificial Intelligence will jointly host a model development competition in Geoscience．The award ceremony will be held during JpGU 2025.

Date and time	Sun. 25 May Lunch break
Place	Special Setting (1) at Exhibition Hall

For details, please refer to the official page below.
*The official page is available in Japanese.

JpGU Field Trips

Six field trips will be held at JpGU2025.
Details are available at the following link

International Mixer Luncheon

This year's IML will be held on the following date, to provide an opportunity for social networking and mutual encouragement among students and early career researchers (ECR) from Japan and abroad.
About 100 people are expected to attend the IML, and boxed lunches and drinks will be served at the event place. Everyone is welcome. We hope that many students and ECRs will join us to make this event more fruitful. If you wish to participate, please register using the registration form below.

Date and time	Monday, 26 May 2025 12:30-13:20
Place	Hotel New Otani Makuhari Lapis (2 min. walk from Makuhari Messe venue)
Event Language	English
Participation fee	500 JPY (to be paid in cash at the venue)
How to join	Please apply using the designated application form. International Mixer Luncheon 2025 Application Form
Application deadline	Thursday, 15 May

*Lunch will be provided, so there is no need to bring your own lunch.