New papers 2019/9/21-24 (Nature, Science, erc...)

Nature Geoscience

1.   Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2

Weimin Si & Yair Rosenthal

PNAS

2.   Global atmospheric oxygen variations recorded by Th/U systematics of igneous rocks

He Liu, Robert E. Zartman, Trevor R. Ireland, and Wei-dong Sun

3.   Multidecadal observations of the Antarctic ice sheet from restored analog radar records

Dustin M. Schroeder, Julian A. Dowdeswell, Martin J. Siegert, Robert G. Bingham, Winnie Chu, Emma J. MacKie, Matthew R. Siegfried, Katherine I. Vega, John R. Emmons, and Keith Winstein

4.   Seawater-buffered diagenesis, destruction of carbon isotope excursions, and the composition of DIC in Neoproterozoic oceans

Paul F. Hoffman and Kelsey G. Lamothe

ICP13 Sydney, Australia 2019, September 2-6

This year marks the 13^th triennial International Conference on Paleoceanography (ICP13) as well as the first time the conference was held in the Southern Hemisphere as it was held in Sydney, Australia. I was given the opportunity to attend this conference in September thanks to the generous travel grant given by the Department of Multidisciplinary Sciences of the Graduate Program on Environmental Sciences at the University of Tokyo. 

The aim of the ICP is to bring together experts in paleoceanography, the history of the oceans. It is an opportunity for researchers working on all timescales with a variety of proxies to gather and share their discoveries with all generations of scientists. The ICP features a number of well-known plenary speakers, all of whom must be invited to speak. As such, the presentations are given by highly respected experts in their respective fields. These meetings are very important as paleoceanography is tied together with paleoclimatology, which is an important part of the International Panel on Climate Change report.

The plenary sessions focused on a range of topics including ice sheet/ocean interactions, ocean circulation, new climate/ocean modeling tools, and the effects of paleoclimate changes on biology and evolution. The presentation given by Dr. Kaustubh Thirumalai of The University of Arizona was very interesting. He had created a model showing how the sea surface temperature variability of the Indian Ocean would change in the future given the currently changing climate. His model results show that the sea surface temperature variability would increase, which would affect wind patterns. He then compared these results to paleoclimate data which showed a similar occurrence had happened in the past. This lecture nicely illustrated the just one of the effects our changing climate will have on different climate systems. 

In addition to the plenary lectures, there were four poster sessions throughout the week where I had the opportunity to present my paper on meltwater fluctuations in East Antarctica. My presentation received attention from other scientists also researching Antarctica, and they provided interesting insights and very helpful feedback on how to improve my research. Many also offered to provide additional data to compare my results to. These poster sessions were a wonderful way to meet and collaborate with other scientists.

Halfway through the week we were treated to a dinner cruise around Sydney Harbor. Pizza and sushi, along with iconic views of the Opera House, made for a memorable evening. The following evening was the Paleomusicology Concert, a series of performances put on by our fellow conference attendees. There were instrumental duets, singing, and dance performances. While the dinner cruise and concert were not strictly research-focused events, it was a good opportunity to socialize with other scientists in a non-professional and relaxed setting. This conference was a great experience, and I am very grateful for the opportunity to have been able to attend.

The fourteenth ICP will be held in Bergen, Norway in 2022. 

Very much looking forward to the next one!

New Papers 2019/9/15 -9/22 (AGU, EGU, GSA)

Biogeosciences

1.         Environmental and biological controls on Na∕Ca ratios in scleractinian cold-water corals

Nicolai Schleinkofer, Jacek Raddatz, André Freiwald, David Evans, Lydia Beuck, Andres Rüggeberg, and Volker Liebetrau

Geophysical Research Letters

2.         Novel, repeated surveys reveal new insights on sediment flux through a narrow strait, Bohai, China

Xiao Wu, Hui Wu, Houjie Wang, Naishuang Bi, Haiqin Duan, Chenghao Wang, Changwei Bian, Jingping Xu

Climate of the Past

3.         Deglacial abrupt climate changes: not simply a freshwater problem

Jorge Alvarez-Solas, Marisa Montoya, and Alexander Robinson

4.       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

5.         Late Miocene to Holocene high-resolution eastern equatorial Pacific carbonate records: stratigraphy linked by dissolution and paleoproductivity

Mitchell Lyle, Anna Joy Drury, Jun Tian, Roy Wilkens, and Thomas Westerhold

New Papers 2019, September 9 - 15 Elsevier

Global and Planetary Change

1.     Synchronous droughts and floods in the Southern Chinese Loess Plateau since 1646 CE in phase with decadal solar activities

Xuefeng Yu, Yi Wang, Shiyong Yu, Zhihai Kang

2.     Upper Ordovician marine red limestones, Tarim Basin, NW China: A product of an oxygenated deep ocean and changing climate?

Mu Liu, Daizhao Chen, Xiqiang Zhou, Dongjie Tang, Theodore R. Them, Maosheng Jiang

3.     Indonesian throughflow controlled the westward extent of the Indo-Pacific Warm Pool during glacial-interglacial intervals

Rajeev Saraswat, D.P. Singh, David W. Lea, A. Mackensen, D.K. Naik

Paleogeography, Paleoclimatology, Paleoecology

4.     Ningaloo Niño/Niña and their regional climate impacts as recorded by corals along the coast of Western Australia

Lun Su, Yan Du, Ming Feng, Jinbao Li

Quaternary Geochronology

5.     The SPICE project: Production rates of cosmogenic 21Ne, 10Be, and 14C in quartz from the 72 ka SP basalt flow, Arizona, USA

Cassandra R. Fenton, Samuel Niedermann, Tibor Dunai, Steven A. Binnie

Quaternary International

6.     Rare earth element fractionations of the northwestern South China Sea sediments, and their implications for East Asian monsoon reconstruction during the last 36 kyr

Mingkun Li, Tingping Ouyang, Zhaoyu Zhu, Chengjing Tian, Shasha Peng, Zhihua Tang, Yan Qiu, Hexian Zhong, Xuechao Peng

横山研メンバーリスト@日本地球化学会(2019.916~18)

横山研メンバーリスト@日本地球化学会(2019.916~18)

M2の太田です。9月16日～18日にかけて、東京大学本郷キャンパス にて「2019年度 日本地球化学会」が開催されます。横山研関係者も多数発表を行います。興味のある方は是非見にきてください！

口頭発表

17日 E会場 10:15~ 1E06

白亜紀の海洋無酸素イベントにおける海洋化学環境と海洋生態系構造 

○芳賀 万由子,田近 英一,尾崎 和海 

17日 D会場 14:30~ 1D01 基調講演 

地球史を通じた一次生産の変遷とその制限要因

 ○尾崎 和海

17日　E会場 15:45~ 1E16

半化石骨安定同位体分析による後期完新世マダガスカルにおける絶滅大型動 物の古生態・古気候復元
畑中 美沙希,○横山 祐典,Geoffrey Clark,宮島 利宏,小川 奈々子,宮入 陽介,大河内 直彦

18日 F会場 11:00~ 2F03

化合物レベル14C年代法による富士山北麓・河口湖堆積物コア中の火山噴出物 の年代推定
○山本 真也,西澤 文勝,吉本 充宏,宮入 陽介,横山 祐典,菅 寿美,大河内 直彦

18日 D会場 11:45~ 2D06 

大気光化学-海洋微生物生態系-炭素循環結合モデルから示唆される太古代の 炭素収支と気候安定性
○渡辺 泰士,田近 英一,尾崎 和海,洪 鵬 

18日 G会場 14:50~ 2G01 奨励賞受賞講演 

生物地球化学循環モデルを用いた地球表層環境の進化に関する理論的研究 

○尾崎 和海 

18日 G会場 15:15~ 2G02 奨励賞受賞講演 

生物源炭酸塩に対する地球化学分析技術を駆使した海洋炭素循環研究 

○窪田 薫 

19日 B会場 11:45~ 3B10

中央海嶺におけるマントルまで達する熱水の化学特性:オマーンオフィオラ イト産ディオプシダイトの例
○秋澤 紀克,三宅 亮,土'山 明,横山 祐典,阿瀬 貴博

ポスター発表

17日 1P28

表層水圏と深部地下圏のメタンサイクル:有機地球化学的・微生物生態学的 手法による断層湖の研究(予察)
○浦井 暖史,高野 淑識,松下 慎,井町 寛之,松井 洋平,宮入 陽介,岩田 拓記,朴 虎東,横山 祐典,大河内 直彦

17日 1P18 

クリーンルームにおける空気中からのホウ素汚染の把握:高精度微量ホウ素 同位体分析のための検討
○川合 達也 ,窪田 薫 ,永石 一弥 ,石川 剛志