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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.


  
Linking Marine Biological Activity to Aerosol Chemical Composition and Cloud-Relevant Properties Over the North Atlantic Ocean 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Mansour, Karam;  39;Dowd, Colin
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/18
aerosol-cloud interactions  CCN  INP  marine aerosol  ocean-atmosphere interactions  oceanic biological activity  
Distinct formation history for deep-mantle domains reflected in geochemical differences 期刊论文
NATURE GEOSCIENCE, 2020, 13 (7) : 511-+
作者:  Doucet, Luc S.;  Li, Zheng-Xiang;  Gamal El Dien, Hamed;  Pourteau, Amaury;  Murphy, J. Brendan;  Collins, William J.;  Mattielli, Nadine;  Olierook, Hugo K. H.;  Spencer, Christopher J.;  Mitchell, Ross N.
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/06
Evaluating the impact of blowing-snow sea salt aerosol on springtime BrO and O-3 in the Arctic 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (12) : 7335-7358
作者:  Huang, Jiayue;  Jaegle, Lyatt;  Chen, Qianjie;  Alexander, Becky;  Sherwen, Tomas;  Evans, Mat J.;  Theys, Nicolas;  Choi, Sungyeon
收藏  |  浏览/下载:9/0  |  提交时间:2020/06/29
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  
Deposition, recycling, and archival of nitrate stable isotopes between the air-snow interface: comparison between Dronning Maud Land and Dome C, Antarctica 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (9) : 5861-5885
作者:  Winton, V. Holly L.;  Ming, Alison;  Caillon, Nicolas;  Hauge, Lisa;  Jones, Anna;  Savarino, Joel;  Yang, Xin;  Frey, Markus M.
收藏  |  浏览/下载:11/0  |  提交时间:2020/05/20
Diminishing CO2-driven gains in water-use efficiency of global forests 期刊论文
NATURE CLIMATE CHANGE, 2020, 10 (5) : 466-+
作者:  Adams, Mark A.;  Buckley, Thomas N.;  Turnbull, Tarryn L.
收藏  |  浏览/下载:7/0  |  提交时间:2020/05/13
Oxygen and sulfur mass-independent isotopic signatures in black crusts: the complementary negative Delta S-33 reservoir of sulfate aerosols? 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (7) : 4255-4273
作者:  Genot, Isabelle;  Yang, David Au;  Martin, Erwan;  Cartigny, Pierre;  Legendre, Erwann;  De Rafelis, Marc
收藏  |  浏览/下载:8/0  |  提交时间:2020/08/18
Oxygen and sulfur mass-independent isotopic signatures in black crusts: the complementary negative Delta S-33 reservoir of sulfate aerosols? 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (7) : 4255-4273
作者:  Genot, Isabelle;  Yang, David Au;  Martin, Erwan;  Cartigny, Pierre;  Legendre, Erwann;  De Rafelis, Marc
收藏  |  浏览/下载:6/0  |  提交时间:2020/05/13
Nutrient dilution and climate cycles underlie declines in a dominant insect herbivore 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (13) : 7271-7275
作者:  Welti, Ellen A. R.;  Roeder, Karl A.;  de Beurs, Kirsten M.;  Joern, Anthony;  Kaspari, Michael
收藏  |  浏览/下载:6/0  |  提交时间:2020/05/13
insect decline  global change  grasshopper  Acrididae  grassland