Subsampling at Geoscience Australia

From February 18 - February 22, a group of members from Yokoyama Lab went to Canberra, Australia for a research trip. Our main purposes were to collect samples from marine sediment cores extracted from the Sabrina Coast, Antarctica and to meet with other scientists to discuss research results and future research prospects. 

First meeting at Geoscience Australia

We first met with Leanne Armand and Alix Post at Geoscience Australia to discuss the cores we were interested in sampling and the analyses we expect to do. We will use Compound Specific Radiocarbon dating to create an age model as well as beryllium isotope ratios to determine periods of meltwater release or changes in ocean currents. After a brief presentation and discussion, we began to sample the two cores. 

Subsampling one of the cores

Many hands make light work, and it only took two days to finish sampling the two cores at Geoscience Australia. The remainder of our time in Canberra was spent working on our projects or in meetings, each of us meeting with different scientists whose research is similar to our own. I joined the meeting with Duanne White and his PhD student Matt at the University of Canberra to present my research results as well as learn about Matt’s research. It was a productive discussion which gave us a lot to think about. 

On our last evening there, our good friend Pengxiang treated a few of us to a buffet dinner followed by a lovely sunset view from Mount Ainslie. It was wonderful to see her again, and we all enjoyed the evening. 

View from Mount Ainslie

サロマ湖観測

こんにちは、修士1年の清水です。

2/21~27の期間で北海道のサロマ湖観測に参加してきましたので、その様子を紹介したいと思います。

今回私が訪れたサロマ湖はオホーツク海に面しており、冬の間は湖面が結氷します。滞在中の気温は基本的に氷点下を下回っており、最低気温が-20℃近くまで下がることもありました。ただし地元の人によれば0℃ぐらいだと"ポカポカ"らしいです笑。

サロマ湖
一面に湖氷が広がっている

今回の観測に参加した目的は、海氷観測の方法について学ぶこととサロマ湖の湖氷コアを採取することでした。調査期間中は北見工業大学の舘山一孝准教授の研究室に観測メンバーとして加えていただき、様々な観測に携わる機会を与えていただきました。また計10本の氷厚30~50cmの湖氷コアをサンプリングすることができたので、今後こちらの研究室で湖氷中の10Beを分析する研究を進めていきたいと考えています。

湖氷コアのサンプリング
手回しドリルで湖氷に穴を開ける

宿に戻った後は北見工業大学の皆さんと交流する場面が多々あり、飲み会で地元や大学の話など様々な話題（あとやけにリアルな怪談話とか）で盛り上がったり、オセロで遊んだりして楽しかったです。
また牡蠣パーティーに参加したり、砕氷船に乗って流氷を観察したりする機会もあり、充実した時間を過ごすことができました。

牡蠣パーティー
牡蠣は酒蒸しで

女満別空港
LS北見のサイン入りカーリングストーン

今回のサロマ湖観測では館山先生を始めとする北見工業大学の皆様には大変お世話になりました。本当にありがとうございました！

New Papers (Nature, Science, etc.) 2020/3/10

Nature Climate Change

1. Ocean-driven Arctic warming

Baird Langenbrunner

Nature Geoscience

2. Earthquakes and tsunamis caused by low-angle normal faulting in the Banda Sea, Indonesia

Phil R. Cummins, Ignatius R. Pranantyo, Jonathan M. Pownall, Jonathan D. Griffin, Irwan Meilano & Siyuan Zhao 

3. No state change in pelagic fish production and biodiversity during the Eocene–Oligocene transition

Elizabeth C. Sibert, Michelle E. Zill, Ella T. Frigyik & Richard D. Norris 

4. Mechanical and hydrological effects of seamount subduction on megathrust stress and slip

Tianhaozhe Sun, Demian Saffer & Susan Ellis  

5. Phosphorus-limited conditions in the early Neoproterozoic ocean maintained low levels of atmospheric oxygen

Romain Guilbaud, Simon W. Poulton, Jennifer Thompson, Kathryn F. Husband, Maoyan Zhu, Ying Zhou, Graham A. Shields & Timothy M. Lenton

6. Limited Archaean continental emergence reflected in an early Archaean ¹⁸O-enriched ocean

Benjamin W. Johnson & Boswell A. Wing

PNAS

7. Timing and magnitude of Southern Ocean sea ice/carbon cycle feedbacks

Karl Stein, Axel Timmermann, Eun Young Kwon, and Tobias Friedrich

8. The vortex gas scaling regime of baroclinic turbulence

Basile Gallet and Raffaele Ferrari

New Papers (AGU, EGU, GSA) 2020/02/24~03/02

Geophysical Research Letters

1. Wind‐driven evolution of the North Pacific subpolar gyre over the last deglaciation
   William R. Gray  Robert C.J. Wills  James W.B. Rae Andrea Burke  Ruza F. Ivanovic William H.G. Roberts  David Ferreira Paul J. Valdes
   
2. The Brewer‐Dobson Circulation During the Last Glacial Maximum
   Qiang Fu  Rachel H. White  Mingcheng Wang Becky Alexander  Susan Solomon Andrew Gettelman David S. Battisti  Pu Lin
   
3. Production of Ancient Dissolved Organic Carbon in Arctic Ocean Sediment: A Pathway of Carbon Cycling in the Extreme Environment
   Wenjing Fu  Yuanzhi Qi Yanguang Liu  Xuchen Wang Ellen M. Druffel  Xiaomei Xu Peng Ren Shuwen Sun  Di Fan

Paleocenography and Paleoclimatology

4. Field Testing the Fidelity of δ18O and δ13C in Reconstructing Upper Ocean Hydrography
   Figen Mekik  Ian Winkelstern
   

Geochemistry, Geophysics, Geosystems

5. Characterization and quantification of magnetofossils within abyssal manganese nodules from the Western Pacific Ocean and implications for nodule formation
   X.D. Jiang  X. Zhao Y.M. Chou  Q.S. Liu A.P. Roberts  J.B. Ren X.M. Sun J.H. Li  X. Tang X.Y. Zhao C.C. Wang

Climate of the past

6. Climate-induced speleothem radiocarbon variability on Socotra Island from the Last Glacial Maximum to the Younger Dryas
   Steffen Therre, Jens Fohlmeister, Dominik Fleitmann, Albert Matter, Stephen J. Burns, Jennifer Arps, Andrea Schröder-Ritzrau, Ronny Friedrich, and Norbert Frank
   
7. Holocene vegetation dynamics in response to climate change and hydrological processes in the Bohai region
   Chen Jinxia, Shi Xuefa, Liu Yanguang, Qiao Shuqing, Yang Shixiong, Yan Shijuan, Lv Huahua, Li Xiaoyan, and Li Chaoxin
   
8. Mid-Holocene Antarctic sea-ice increase driven by marine ice sheet retreat
   Kate E. Ashley, James A. Bendle, Robert McKay, Johan Etourneau, Francis J. Jimenez-Espejo, Alan Condron, Anna Albot, Xavier Crosta, Christina Riesselman, Osamu Seki, Guillaume Massé, Nicholas R. Golledge, Edward Gasson, Daniel P. Lowry, Nicholas E. Barrand, Katelyn Johnson, Nancy Bertler, Carlota Escutia, and Robert Dunbar
   
9. High-frequency climate oscillations in the Holocene from a coastal-dome ice core in east central Greenland
   Abigail G. Hughes, Tyler R. Jones, Bo M. Vinther, Vasileios Gkinis, C. Max Stevens, Valerie Morris, Bruce H. Vaughn, Christian Holme, Bradley R. Markle, and James W. C. White

JGR: Ocean

GSA Bulletin

Global Biogeochemical Cycle

no relevant

New Papers February 24 – March 1, 2020: Elsevier

Paleogeography, Paleoclimatology, Paleoecology

1.     A rapid hydroclimate change and its influence on the Songliao Basin during the Santonian-Campanian transition as recorded by compound-specific isotopes

Li Wang, Yankuan Tian, Jiaju Zhao

Global and Planetary Change

2.     Forcing of western tropical South Atlantic sea surface temperature across three glacial-interglacial cycles

Alicia Hou, André Bahr, Stefan Schmidt, Cornelia Strebl, Ana Luiza Albuquerque, Cristiano M. Chiessi, Oliver Friedrich

3.     Can we extrapolate climate in an inner basin? The case of the Red Sea

Sabique Langodan, Luigi Cavaleri, Jesus Portilla, Yasser Abualnaja, Ibrahim Hoteit

Quaternary International

4.     Dating of an alpine ice core from the interior of the Tibetan Plateau

Lili Shao, Lide Tian, Guangjian Wu, David Naftz, Zhongyin Cai, Cheng Wang, Yao Li, László Palcsu

5.     Pollen-based climate reconstruction from Ebi Lake in northwestern China, Central Asia, over the past 37,000 years

Hongjuan Jia, Jinglu Wu, Hao Zhang, Sangheon Yi

6.     Paleoenvironmental Reconstruction Using Stable Isotopes And Trace Elements From Archaeological Freshwater Bivalve Shell Fragments In Northwest Patagonia, Argentina

Alberto E. Pérez, Daniel A. Batres, Iara Rocchetta, María R. Eppis, María L. Bianchi, Carlos M. Luquet

Quaternary Science Reviews

7.     Interactions between climate change and early agriculture in SW China and their effect on lake ecosystem functioning at centennial timescales over the last 2000 years

Qian Wang, N. John Anderson, Xiangdong Yang, Min Xu

8.     From natural to cultural mires during the last 15 ka years: An integrated approach comparing 14C ages on basal peat layers with geomorphological, palaeoecological and archaeological data (Eastern Massif Central, France)

André-Marie Dendievel, Isabelle Jouffroy-Bapicot, Jacqueline Argant, Antoine Scholtès, Arnaud Tourman, Jacques-Louis de Beaulieu, Hervé Cubizolle