Title: Toward reducing the large low bias in aerosol number concentrations over the Southern Ocean in GEOS-Chem model
Title: Past and future changes in Arctic aerosols
2025
December
2025.12.22 
We had a guest seminar on December 22nd. Dr. Ishino from Kanazawa University and Dr. Pernov from Queensland University of Technology gave presentations on aerosols in polar regions. Active discussions continued late into the evening.
Title: Toward reducing the large low bias in aerosol number concentrations over the Southern Ocean in GEOS-Chem model
Title: Past and future changes in Arctic aerosols
2024
2023
May
2023.5.22
Researcher, Koji Sugie, from the ESS; Researcher, Masahide Wakita, from MIO; and colleagues from the RIGC at the JAMSTEC are involved a joint monitoring research in collaboration with Tohoku Environmental Science Services Corporation, Aomori Prefectural Industrial Technology Research Center, Faculty of Fisheries Sciences at Hokkaido University, and Japan Fisheries Research and Education Agency, which has been ongoing since 2010.The paper published in the Environmental Research described the ecosystem dynamics in the Tsugaru Strait that is driven by synoptic decadal climatological variability.
JAMSTEC Press Releases
Environmental Research
March
2022
November
2022.11.10
Drs. Koji Sugie and Makio Honda collaborated with a science writer on the submission of POGO (Partnership for Observation of the Global Ocean) website article regarding the ocean acidification and the biological carbon pump.
Article
POGO observation network
JUly
2022.7.12
Earth Surface System Research Center (ESS-2) cooperated with a Japanese TV station (NHK) to produce a program.
In this TV program, we measured shell density and thickness of Limacina helicina (planktonic gastropod) living in the Arctic Ocean and bivalves in Tokyo Bay.
Date on the air
17, July, 2022.
Title
NHK Special “Changing Ocean: The creeping threat of ocean acidification”
URL
2021
October
September
2021.9.29
Development of quantification method of silicate for siliceous plankton: Elucidation of the role of radiolarians in the silicon circulation in the western Arctic Ocean
Abstract
We propose a new method to quantify individual radiolarian skeletal volume by using the microfocus X-ray computed tomography technique. This method allows us to calculate the volume of complex radiolarian skeletons, which cannot be reproduced accurately enough by simple geometric models, and to estimate for the first time the amount of radiolarian-derived biogenic silica flux in the seasonal sea ice extent of the Arctic Ocean. The application of our new method to waters other than the Arctic Ocean and sediments will lead to the elucidation of the role of siliceous shell plankton in the silica cycle from the past to the present.
(https://doi.org/10.1002/lno.11928)
Title
New evaluation of species-specific biogenic silica flux of radiolarians (Rhizaria) in the western Arctic Ocean using microfocus X-ray computed tomography
Keywords
Protists, Radiolaria, Silicon circulation, Microfocus X-ray CT (µXCT) , Arctic Ocean
Members
- Takahito Ikenoue, Head Office, Marine Ecology Research Institute, Tokyo, Japan.
- Katsunori Kimoto, Yuriko Nakamura, Jonaotaro Onodera、Naomi Harada、Makio C. Honda、Miyako Sato, Eiji Watanabe, Motoyo Itoh, Shigeto Nishino, Takashi Kikuchi
Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan. - Kjell R. Bjørklund, Natural History Museum, Department of Geology, University of Oslo, Oslo, Norway.
- Naoki Kuramoto, Masaaki Ueki, Yuichi Ota, National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan.
A 3-dimensional model obtained by microfocus X-ray CT of 13 major radiolarian taxa from the western Arctic Ocean.
February
2020
2019
December
2019.12.26
Observational study of the ocean acidification began at the coastal area of the southern Sea of Okhotsk
In order to evaluate changes in the marine environment and marine life on the coastal area of the Sea of Okhotsk, two pH / pCO2 sensors were installed at a depth of 5 m in the port of Monbetsu, and observations began in December 2019.
This observation will continue until FY2022.
This research is conducted based on a joint research agreement between the Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology and Monbetsu City.
Contact
Authors: Shinya Iwasaki, Katsunori Kimoto, Yusuke Okazaki, Minoru, Ikehara
Journal: Geochemistry Geophysics Geosystems
＜Abstract＞
In this study, we observed dissolution processes of three species of planktic foraminiferal test using by X-ray micro CT scanning, and tested the ability of a new foraminiferal test dissolution index. As a result, we suggested that X-ray micro CT scanning is applicable for evaluating the intensity of foraminiferal test dissolution at the undersaturated deep seafloor in the western North Pacific area and is an invaluable proxy for detecting deep seawater carbonate ion concentration changes on glacial interglacial timescales.
November
2019.11.12
Dr. Yugo Kanaya was honored with the 2019 Horiuchi Award of the Meteorological Society of Japan
Dr. Yugo Kanaya (Earth Surface System Research Center, RIGC) received the 2019 Horiuchi Award of the Meteorological Society of Japan. This award is for an individual who has made a significant contribution in interdisciplinary fields related to atmospheric sciences. The award ceremony and award commemorative lecture were held on October 29, 2019, during the 2019 MSJ autumn meeting in Fukuoka.
Title
Promotion of integrated understanding of air pollution in Asia by observations using spectroscopic techniques
Related Links
The Meteorological Society of Japan：https://www.metsoc.jp/en/
2019年度堀内賞、正野賞、山本賞、小倉奨励賞の受賞者決まる
October
2019.10.1
We added new data to "KEO time-series sediment trap data".
September
2019.9.13
Phaeodaria, a large marine protozoa (Cercozoa) plays great contribution to POC transportation in the North Pacific
（Co-author：Katsunori Kimoto, Miyako Sato, Makio Honda, Naomi Harada, Tetsuichi Fujiki）
Takahito Ikenoue, Katsunori Kimoto, Yusuke Okazaki, Miyako Sato, Makio C. Honda, Kozo Takahashi, Naomi Harada, Tetsuichi Fujiki
＜Abstract＞
The focus of our study is the large number of phaeodarians among the >1 mm sinking particles, which have traditionally been excluded when estimating sinking particle fluxes. Our study revealed that >1 mm sinking particles exported substantial amount of particulate organic carbon in the western North Pacific and that one of the major carriers in the mesopelagic zone was Phaeodaria. Previous studies estimated phaeodarian carbon contents from the biovolumes and existing conversion factor. However, there have been actually no direct measurements of carbon contents in phaeodarians, unless our present study. Our simple dissection method and direct measurement of the organic carbon content in phaeodarians will be an important step to elucidate the global contribution of phaeodarians to the biological carbon pump.
July
2019.7.22
Shell density of planktic foraminifers are affected by Ocean acidification in the North Pacific
Sensitivity of planktic foraminiferal test bulk density to ocean acidification
June
May
2019.5.27
Employment Opportunities
April
2019.4.1
Reorganization from RCGC to ESS.
2018
December
2018.12.3
We held a "Ecosystem Group Guest Seminar".
Speaker: Onur Kerimoglu (Helmholtz-Zentrum Geesthacht)
November
2018.11.9
We held a "Ecosystem Group Guest Seminar".
Speaker: George L. Hunt, Jr. (Univ. of Washington)
October
June
2018.6.26
We held a "Ecosystem Group Seminar".
Speaker: Yoshikazu Sasai and S. Lan Smith
2018.6.21
KEO sediment trap data 2016-2017 is released to the public.
May
2018.5.24
We held a "Ecosystem Group Seminar".
Speaker: Minoru Kitamura and Siri Ofstad
2018.5.1
We held a "Ecosystem Group Seminar".
Speaker: Eko Siswanto and Kana Nagashima
April
March
2018.3.29
We held a "Ecosystem Group Seminar".
Speaker: Miyako Sato and Yuriko Nakamura
2018.3.12
We held a "Ecosystem Group Seminar".
Speaker: Maki Noguchi Aita and Erina Shima
February
2018.2.26
We held a "Ecosystem Group Seminar".
Speaker: Carmen García-Comas and Jonaotaro Onodera
2018.2.13
We held a "Ecosystem Group Seminar".
Speaker: Hajime Kimura and Takuhei Shiozaki
January
2018.1.30
We held a "Ecosystem Group Seminar".
Speaker: Bingzhang Chen and Siri Ofstad
2018.1.15
We held a "Ecosystem Group Seminar".
Speaker: Tetsuichi Fujiki and Naomi Harada
2017
December
2017.12.25
We held a "Ecosystem Group Seminar".
Speaker: Koji Sugie
November
2017.11.2
We held a "Ecosystem Group Seminar".
Speaker: Minoru Kitamura and Taketo Hashioka
October
2017.10.10
We held a "Ecosystem Group Seminar".
Speaker: Kana Nagashima and Yoshikazu Sasai
September
2016.9.28
Employment Opportunities
2017.9.25
We held a "Ecosystem Group Seminar".
Speaker: Eko Siswanto
August
June
2017.6.5
We held a "Ecosystem Group Seminar".
Speaker: Jonaotaro Onodera and Takuhei Shiozaki
May
2017.5.22
We held a "Ecosystem Group Seminar".
Speaker: Maki Noguchi Aita and Naomi Harada
2017.5.1
We held a "Ecosystem Group Seminar".
Speaker: Erina shima and Hajime Kimura
April
2017.4.17
We held a "Ecosystem Group Seminar".
Speaker: Bingzhang Chen, S. Lan Smith and Shinya Iwasaki
March
2017.3.24
We held a "Ecosystem Group Seminar".
Speaker: Miyako Satoh and Yuriko Nakamura
February
2017.2.28
We held a "Ecosystem Group Seminar".
Speaker: Tetsuichi Fujiki and Katsunori Kimoto
2017.2.14
We held a "Ecosystem Group Seminar".
Speaker: Taketo Hashioka and Minoru Kitamura
January
2017.1.27
We held a "Ecosystem Group Seminar".
Speaker: Koji Sugie and Carmen Garcia-Comas Rubio
2017.1.13
We held a "Ecosystem Group Seminar".
Speaker: Yoshikazu Sasai and Bingzhang Chen
2016
December
2016.12.26
We held a "Ecosystem Group Seminar".
Speaker: Eko Siswanto and Naomi Harada GL.
November
October
2016.10.3
We held a "Ecosystem Group Seminar".
Speaker: Kana Nagashima and Maki Noguchi Aita
September
2016.9.15
Employment Opportunities
2016.9.6
We held a "Ecosystem Group Seminar".
Speaker: S. Lan Smith
August
July
June
2016.6.10
We held a "Ecosystem Group Seminar".
Speaker: Bing-Zhang Chen and Naomi Harada
May
2016.5.13
We held a "Ecosystem Group Seminar".
Speaker: Minoru Kitamura and Yoshikazu Sasai
April
2016.4.26
We held a "Ecosystem Group Seminar".
Speaker: Eko Siswanto and Katsunori Kimoto
2016.4.25
Employment Opportunities
2016.4.15
We held a "Ecosystem Group Seminar".
Speaker: Tetsuichi fujiki and Taketo Hashioka
March
February
2016.2.9
We held a "Ecosystem Group Seminar".
Speaker: Takuhei Shiozaki
January
2016.1.8
We held a "Ecosystem Group Seminar".
Speaker: Kazuyuki Miyazaki and Kana Nagashima
2015
December
2015.12.28
We held a "Ecosystem Group Seminar".
Speaker: Koji Sugie and Jonaotaro Onodera
2015.12.15
We held a "Ecosystem Group Guest Seminar".
Speaker: Dr. Ben Ward
November
2015.11.27
We held a "Ecosystem Group Seminar".
Speaker: Yoshikazu Sasai and Naomi Harada GL
2015.11.19
Employment Opportunities
October
2015.10.22
Employment Opportunities
September
2015.9.11
Employment Opportunities
FY2016 [Ocean Circulation Research Group, Research and Development Center for Global Change]
Recruitment of Postdoctoral Researcher
2015.9.7
Employment Opportunities
FY2015 [Marine Ecosystem Dynamics Research Group, Research and Development Center for Global Change]
Recruitment of Postdoctoral Researcher
August
July
June
2015.6.26
We held a "Ecosystem Group Seminar" (Speaker: Kana Nagashima and Carmen Garcia-Comas Rubio).
2015.6.2
Figure of our paper was published on the cover of the journal "Paleoceanpgraphy".
Shinya Iwasaki, Katsunori Kimoto, Osamu Sasaki, Harumasa Kano, Makio C. Honda, Yusuke Okazaki Observation of the dissolution process of Globigerina bulloides tests (planktic foraminifera) by X‐ray microcomputed tomography 10 April 2015Vol:30,Pages:317–331DOI:10.1002/2014PA002639
Related link
May
2015.5.15
We held a "Ecosystem Group Seminar" (Speaker: Kazuyuki Miyazaki and Koji Sugie).
March
2015.3.19
We held a "Ecosystem Group Seminar" (Speaker: Miyako Sato and Yurikp Nakamura, Tomoko Yoshiki).
2015.3.3
We held a "Ecosystem Group Seminar" (Speaker: Eko Siswanto and Haruka Takagi).
February
2015.2.26
We have published a list of "Tropical Climate Seminar".
2015.2.12
We held a "Ecosystem Group Seminar" (Speaker: Bingzhang Chen and Yoshikazu Sasai).
January
2015.1.26
We held a "Ecosystem Group Seminar" (Speaker: Maki Noguchi Aita and Minoru Kitamura).
2015.1.19
We have published the new data in the Paleoclimate-Ocean Database!
Related link
2015.1.8
We held a "Ecosystem Group Seminar" (Speaker: Tetsuichi Fujiki and Katsunori Kimoto).
2014
December
2014.12.22
We held a "Ecosystem Group Seminar" (Speaker: Sanae Chiba and Carmen Garcia-Comas Rubio).
2014.12.12
We held a "Ecosystem Group Seminar" (Speaker: Naomi Harada GL and Kana Nagashima).
November
2014.11.25
We held a "Ecosystem Group Seminar" (Speaker: Taketo Hashioka and S. Lan Smith).
2014.11.13
Photograph of a symbiont-bearing planktic foraminifer taken by Haruka Takagi (RCGC Research Student / Waseda Univ.) was selected as the front cover image of the Journal of Plankton Research (Volume 36
Issue 6 November/December 2014).
Globigerinoides ruber with symbiotic dinoflagellate Pelagodinium béii, collected at Sagami Bay, Japan. The symbionts are distributed widely along the spines by cytoplasmic flow of the host. Photo by Haruka Takagi. Fujiki et al. J. Plankton Res., 36; pp 1403–1407.
2014.11.13
We held a "Ecosystem Group Seminar" (Speaker: Koji Sugie and Jonaotara Onodera).
2014.11.11
We held a "Ecosystem Group Special Seminar" (Speaker: Markus Pahlow and Kai W. Wirtz).
October
2014.10.23
We held a "Ecosystem Group Seminar" (Speaker: Tetsuichi FUJIKI and Katsunori KIMOTO).
2014.10.2
We held a "Ecosystem Group Seminar" (Speaker: Tomoko Yoshiki and Kazuyuki Miyazaki).
September
2014.9.25
We held a "Ecosystem Group Seminar" (Speaker: Fumihiro ITO and Haruka TAKAGI).
2014.9.8
We held a "Ecosystem Group Seminar" (Speaker: Maki NOGUCHI and Eko SISWANTO).
August
2014.8.29
We have published the new data in the Paleoclimate-Ocean Database!
Related link
2014.8.26
We held a "Ecosystem Group Seminar" (Speaker: Taketo Hashioka and Minoru Kitamura).
2014.8.21
Information of Employment Opportunities
Details can be found at the following:
- FY2015 [Global Chemical and Physical Oceanography Group, Research and Development Center for Global Change] Recruitment of Scientist of Technical Scientist
- FY2015 [Arctic Ocean and Climate System Research Group, Research and Development Center for Global Change] Recruitment of Scientist of Technical Scientist
2014.8.21
We held a "Ecosystem Group Seminar" (Speaker: Sergio M. Vallina).
2014.8.6
We have released a new website for an introduction of deep ocean observations with "Deep NINJA".
Deep NINJA
We have released a new website for an introduction of deep ocean observations with "Deep NINJA," which is the first practical deep float developed by JAMSTEC and Tsurumi-Seiki Co. Ltd.
July
2014.7.18
We held a "Ecosystem Group Seminar" (Speaker: Sanae CHIBA and S. Lan SMITH).
2014.7.7
We held a "Ecosystem Group Seminar" (Speaker: Kana NAGASHIMA and Jonaotaro ONODERA).
June
2014.6.23
We held a "Ecosystem Group Seminar".
2014.6.6
We have published the new data in the Paleoclimate-Ocean Database!
Related link