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科学家基于全球氮同位素分析揭示了8亿年前地球生命演化进程 快报文章
地球科学快报,2023年第07期
作者:  王晓晨
Microsoft Word(38Kb)  |  收藏  |  浏览/下载:564/0  |  提交时间:2023/04/10
Nitrogen isotopes  Life evolution  
科学家通过研究火山岩稀有气体同位素变化揭示地幔演化过程 快报文章
地球科学快报,2022年第14期
作者:  王晓晨
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noble gas isotopes  plume  
科学家实现对冰岛Fagradalsfjall火山喷发的近实时监测研究 快报文章
地球科学快报,2022年第13期
作者:  王立伟
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mantle  oxygen isotopes  Fagradalsfjall eruption  
海洋化学变化揭示了海平面对全球碳循环的影响 快报文章
资源环境快报,2021年第7期
作者:  薛明媚
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Sr Isotopes  Carbonate Deposition  Carbon Cycle  
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.


  
East Asian Precipitation delta O-18 Relationship With Various Monsoon Indices 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Wang, Yingzhao;  Hu, Chaoyong;  Ruan, Jiaoyang;  Johnson, Kathleen R.
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Asian Monsoon  ENSO  precipitation oxygen isotopes  monsoon index  speleothems  
Source forensics ofn-alkanes andn-fatty acids in urban aerosols using compound specific radiocarbon/stable carbon isotopic composition 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (7)
作者:  Ren, Lujie;  Wang, Yiyun;  Kawamura, Kimitaka;  Bikkina, Srinivas;  Haghipour, Negar;  Wacker, Lukas;  Pavuluri, Chandra Mouli;  Zhang, Zhimin;  Yue, Siyao;  Sun, Yele;  Wang, Zifa;  Zhang, Yanli;  Feng, Xiaojuan;  Liu, Cong-Qiang;  Eglinton, Timothy, I;  Fu, Pingqing
收藏  |  浏览/下载:16/0  |  提交时间:2020/08/18
atmospheric aerosols  n-alkanes  n-fatty acids  compound-specific stable carbon isotopes  radiocarbon isotopes  
Changes of Emission Sources to Nitrate Aerosols in Beijing After the Clean Air Actions: Evidence From Dual Isotope Compositions 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (12)
作者:  Fan, Mei-Yi;  Zhang, Yan-Lin;  Lin, Yu-Chi;  Cao, Fang;  Zhao, Zhu-Yu;  Sun, Yele;  Qiu, Yanmei;  Fu, Pingqing;  Wang, Yuxuan
收藏  |  浏览/下载:15/0  |  提交时间:2020/08/18
nitrate aerosols  haze events  stable isotopes  formation mechanism  source apportionment  
Stratospheric Ozone Changes From Explosive Tropical Volcanoes: Modeling and Ice Core Constraints 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (11)
作者:  Ming, Alison;  Winton, V. Holly L.;  Keeble, James;  Abraham, Nathan L.;  Dalvi, Mohit C.;  Griffiths, Paul;  Caillon, Nicolas;  Jones, Anna E.;  Mulvaney, Robert;  Savarino, Joel;  Frey, Markus M.;  Yang, Xin
收藏  |  浏览/下载:11/0  |  提交时间:2020/08/18
volcanic eruption  ozone  isotopes in ice cores  Samalas  chemistry-climate modeling  Antarctica  
The Great Oxidation Event preceded a Paleoproterozoic "snowball Earth" 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (24) : 13314-13320
作者:  Warke, Matthew R.;  Di Rocco, Tommaso;  Zerkle, Aubrey L.;  Lepland, Aivo;  Prave, Anthony R.;  Martin, Adam P.;  Ueno, Yuichiro;  Condon, Daniel J.;  Claire, Mark W.
收藏  |  浏览/下载:9/0  |  提交时间:2020/06/09
quadruple sulfur isotopes  mass independent fractionation  Great Oxidation Event  snowball Earth