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Ice retreat in Wilkes Basin of East Antarctica during a warm interglacial 期刊论文
NATURE, 2020, 583 (7817) : 554-+
作者:  T. Blackburn;  G. H. Edwards;  S. Tulaczyk;  M. Scudder;  G. Piccione;  B. Hallet;  N. McLean;  J. C. Zachos;  B. Cheney;  J. T. Babbe
收藏  |  浏览/下载:18/0  |  提交时间:2020/08/09

Uranium isotopes in subglacial precipitates from the Wilkes Basin of the East Antarctic Ice Sheet reveal ice retreat during a warm Pleistocene interglacial period about 400,000 years ago.


Efforts to improve sea level forecasting on a warming planet have focused on determining the temperature, sea level and extent of polar ice sheets during Earth'  s past interglacial warm periods(1-3). About 400,000 years ago, during the interglacial period known as Marine Isotopic Stage 11 (MIS11), the global temperature was 1 to 2 degrees Celsius greater(2)and sea level was 6 to 13 metres higher(1,3). Sea level estimates in excess of about 10 metres, however, have been discounted because these require a contribution from the East Antarctic Ice Sheet(3), which has been argued to have remained stable for millions of years before and includes MIS11(4,5). Here we show how the evolution of(234)U enrichment within the subglacial waters of East Antarctica recorded the ice sheet'  s response to MIS11 warming. Within the Wilkes Basin, subglacial chemical precipitates of opal and calcite record accumulation of(234)U (the product of rock-water contact within an isolated subglacial reservoir) up to 20 times higher than that found in marine waters. The timescales of(234)U enrichment place the inception of this reservoir at MIS11. Informed by the(234)U cycling observed in the Laurentide Ice Sheet, where(234)U accumulated during periods of ice stability(6)and was flushed to global oceans in response to deglaciation(7), we interpret our East Antarctic dataset to represent ice loss within the Wilkes Basin at MIS11. The(234)U accumulation within the Wilkes Basin is also observed in the McMurdo Dry Valleys brines(8-10), indicating(11)that the brine originated beneath the adjacent East Antarctic Ice Sheet. The marine origin of brine salts(10)and bacteria(12)implies that MIS11 ice loss was coupled with marine flooding. Collectively, these data indicate that during one of the warmest Pleistocene interglacials, the ice sheet margin at the Wilkes Basin retreated to near the precipitate location, about 700 kilometres inland from the current position of the ice margin, which-assuming current ice volumes-would have contributed about 3 to 4 metres(13)to global sea levels.


  
Sea spray aerosol organic enrichment, water uptake and surface tension effects 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (13) : 7955-7977
作者:  Cravigan, Luke T.;  Mallet, Marc D.;  Vaattovaara, Petri;  Harvey, Mike J.;  Law, Cliff S.;  Modini, Robin L.;  Russell, Lynn M.;  Stelcer, Ed;  Cohen, David D.;  Olsen, Greg;  Safi, Karl;  Burrell, Timothy J.;  Ristovski, Zoran
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/14
Mud in rivers transported as flocculated and suspended bed material 期刊论文
NATURE GEOSCIENCE, 2020
作者:  Lamb, Michael P.;  de Leeuw, Jan;  Fischer, Woodward W.;  Moodie, Andrew J.;  Venditti, Jeremy G.;  Nittrouer, Jeffrey A.;  Haught, Daniel;  Parker, Gary
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/09
Paleosalinity assessment and its influence on source rock deposition in the western Pearl River Mouth Basin, South China Sea 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (7-8) : 1741-1755
作者:  Quan, Yongbin;  Liu, Jianzhang;  Hao, Fang;  Cai, Zhongxian;  Xie, Yuhong
收藏  |  浏览/下载:13/0  |  提交时间:2020/08/18
Coastal sedimentation across North America doubled in the 20(th) century despite river dams 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Rodriguez, A. B.;  McKee, B. A.;  Miller, C. B.;  Bost, M. C.;  Atencio, A. N.
收藏  |  浏览/下载:8/0  |  提交时间:2020/06/29
Groundwater level observations in 250,000 coastal US wells reveal scope of potential seawater intrusion 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Jasechko, Scott;  Perrone, Debra;  Seybold, Hansjoerg;  Fan, Ying;  Kirchner, James W.
收藏  |  浏览/下载:5/0  |  提交时间:2020/06/29
Rapidly-migrating and internally-generated knickpoints can control submarine channel evolution 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Heijnen, Maarten S.;  Clare, Michael A.;  Cartigny, Matthieu J. B.;  Talling, Peter J.;  Hage, Sophie;  Lintern, D. Gwyn;  Stacey, Cooper;  Parsons, Daniel R.;  Simmons, Stephen M.;  Chen, Ye;  Sumner, Esther J.;  Dix, Justin K.;  Clarke, John E. Hughes
收藏  |  浏览/下载:13/0  |  提交时间:2020/06/22
Variability and past long-term changes of brominated very short-lived substances at the tropical tropopause 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (11) : 7103-7123
作者:  Tegtmeier, Susann;  Atlas, Elliot;  Quack, Birgit;  Ziska, Franziska;  Krueger, Kirstin
收藏  |  浏览/下载:6/0  |  提交时间:2020/06/22
Marine organic matter in the remote environment of the Cape Verde islands - an introduction and overview to the MarParCloud campaign 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (11) : 6921-6951
作者:  van Pinxteren, Manuela;  Fomba, Khanneh Wadinga;  Triesch, Nadja;  Stolle, Christian;  Wurl, Oliver;  Bahlmann, Enno;  Gong, Xianda;  Voigtlaender, Jens;  Wex, Heike;  Robinson, Tiera-Brandy;  Barthel, Stefan;  Zeppenfeld, Sebastian;  Hoffmann, Erik Hans;  Roveretto, Marie;  Li, Chunlin;  Grosselin, Benoit;  Daele, Veronique;  Senf, Fabian;  van Pinxteren, Dominik;  Manzi, Malena;  Zabalegui, Nicolas;  Frka, Sanja;  Gasparovic, Blazenka;  Pereira, Ryan;  Li, Tao;  Wen, Liang;  Li, Jiarong;  Zhu, Chao;  Chen, Hui;  Chen, Jianmin;  Fiedler, Bjoern;  Von Tuempling, Wolf;  Read, Katie Alana;  Punjabi, Shalini;  Lewis, Alastair Charles;  Hopkins, James Roland;  Carpenter, Lucy Jane;  Peeken, Ilka;  Rixen, Tim;  Schulz-Bull, Detlef;  Monge, Maria Eugenia;  Mellouki, Abdelwahid;  George, Christian;  Stratmann, Frank;  Herrmann, Hartmut
收藏  |  浏览/下载:23/0  |  提交时间:2020/08/18
Surface processes in the 7 November 2014 medicane from air-sea coupled high-resolution numerical modelling 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (11) : 6861-6881
作者:  Bouin, Marie-Noelle;  Brossier, Cindy Lebeaupin
收藏  |  浏览/下载:5/0  |  提交时间:2020/06/16