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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:21/0  |  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.


  
Day–night variation and size distribution of water-soluble inorganic ions in particulate matter in Ulsan, South Korea 期刊论文
Atmospheric Research, 2020
作者:  Tien Van Do, Quang Tran Vuong, Sung-Deuk Choi
收藏  |  浏览/下载:0/0  |  提交时间:2020/07/21
Understanding the Interfacial Behavior of Typical Perfluorocarboxylic Acids at Surfactant-Coated Aqueous Interfaces 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Cheng, Shumin;  Du, Lin;  George, Christian
收藏  |  浏览/下载:14/0  |  提交时间:2020/08/18
Langmuir film  Lipid  Mixed monolayer  Air-water interface  sea spray aerosol  Perfluorocarboxylic acids  
Mixing states of Amazon-basin aerosol particles transported over long distances using transmission electron microscopy 期刊论文
Atmospheric Chemistry and Physics, 2020
作者:  Kouji Adachi, Naga Oshima, Zhaoheng Gong, Suzane de Sá, Adam P. Bateman, Scot T. Martin, Joel F. de Brito, Paulo Artaxo, Glauber G. Cirino, Arthur J. Sedlacek III, and Peter R. Buseck
收藏  |  浏览/下载:14/0  |  提交时间:2020/06/09
Assessing the variations in the chemical composition of rainwater and air masses using the zonal and meridional index 期刊论文
ATMOSPHERIC RESEARCH, 2020, 237
作者:  Keresztesi, Agnes;  Nita, Ion-Andrei;  Birsan, Marius-Victor;  Bodor, Zsolt;  Pernyeszi, Timea;  Micheu, Miruna Mihaela;  Szep, Robert
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/02
Rainwater chemistry  Atmospheric circulations  Zonal Index  Meridional Index  ERA Interim  Source apportionment  
UV radiation blamed in ancient mass extinction 期刊论文
Science, 2020
作者:  Paul Voosen
收藏  |  浏览/下载:1/0  |  提交时间:2020/06/01
Solid Ammonium Nitrate Aerosols as Efficient Ice Nucleating Particles at Cirrus Temperatures 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (8)
作者:  Wagner, Robert;  Bertozzi, Barbara;  Hoepfner, Michael;  Hoehler, Kristina;  Moehler, Ottmar;  Saathoff, Harald;  Leisner, Thomas
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/02
Individual Particle Characteristics, Optical Properties and Evolution of an Extreme Long-Range Transported Biomass Burning Event in the European Arctic (Ny-angstrom lesund, Svalbard Islands) 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (5)
作者:  Moroni, B.;  Ritter, C.;  Crocchianti, S.;  Markowicz, K.;  Mazzola, M.;  Becagli, S.;  Traversi, R.;  Krejci, R.;  Tunved, P.;  Cappelletti, D.
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/02
SEM-EDS  particle size distribution  aerosol optical properties  closure studies  aerosol evolution  
Compositions of Dust and Sea Salts in the Dome C and Dome Fuji Ice Cores From Last Glacial Maximum to Early Holocene Based on Ice-Sublimation and Single-Particle Measurements 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (4)
作者:  Oyabu, I.;  Iizuka, Y.;  Kawamura, K.;  Wolff, E.;  Severi, M.;  Ohgaito, R.;  Abe-Ouchi, A.;  Hansson, M.
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
Composition and origin of PM2.5 aerosol particles in the upper Rhine valley in summer 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2019, 19 (20) : 13189-13208
作者:  Shen, Xiaoli;  Vogel, Heike;  Vogel, Bernhard;  Huang, Wei;  Mohr, Claudia;  Ramisetty, Ramakrishna;  Leisner, Thomas;  Prevot, Andre S. H.;  Saathoff, Harald
收藏  |  浏览/下载:9/0  |  提交时间:2019/11/27