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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:58/0  |  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.


  
Quantifying the Controls on Evapotranspiration Partitioning in the Highest Alpine Meadow Ecosystem 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (4)
作者:  Cui, Jiangpeng;  Tian, Lide;  Wei, Zhongwang;  Huntingford, Chris;  Wang, Pei;  Cai, Zhongyin;  Ma, Ning;  Wang, Lixin
收藏  |  浏览/下载:24/0  |  提交时间:2020/07/02
chamber  evapotranspiration partitioning  leaf area index  soil water content  stable isotopes  Tibetan Plateau  
Influence of Summer Sublimation on delta D, delta O-18, and delta O-17 in Precipitation, East Antarctica, and Implications for Climate Reconstruction From Ice Cores 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2019, 124 (13) : 7339-7358
作者:  Pang, Hongxi;  Hou, Shugui;  Landais, Amaelle;  Masson-Delmotte, Valerie;  Jouzel, Jean;  Steen-Larsen, Hans Christian;  Risi, Camille;  Zhang, Wangbin;  Wu, Shuangye;  Li, Yuansheng;  An, Chunlei;  Wang, Yetang;  Prie, Frederic;  Minster, Benedicte;  Falourd, Sonia;  Stenni, Barbara;  Scarchilli, Claudio;  Fujita, Koji;  Grigioni, Paolo
收藏  |  浏览/下载:30/0  |  提交时间:2019/11/27
Antarctica  ice core  water stable isotopes  climate  
Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2019, 124 (6) : 2932-2945
作者:  Madsen, M. V.;  Steen-Larsen, H. C.;  Hoerhold, M.;  Box, J.;  Berben, S. M. P.;  Capron, E.;  Faber, A. -K.;  Hubbard, A.;  Jensen, M. F.;  Jones, T. R.;  Kipfstuhl, S.;  Koldtoft, I.;  Pillar, H. R.;  Vaughn, B. H.;  Vladimirova, D.;  Dahl-Jensen, D.
收藏  |  浏览/下载:49/0  |  提交时间:2019/11/26
water stable isotopes  Greenland  snow surface processes  vapor exchange  
North America's oldest boreal trees are more efficient water users due to increased [CO2], but do not grow faster 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (7) : 2749-2754
作者:  Giguere-Croteau, Claudie;  Boucher, Etienne;  Bergeron, Yves;  Girardin, Martin P.;  Drobyshev, Igor;  Silva, Lucas C. R.;  Helie, Jean-Francois;  Garneau, Michelle
收藏  |  浏览/下载:26/0  |  提交时间:2019/11/27
water use efficiency  carbon dioxide  stable isotopes  productivity  boreal forest  
Disentangling the role of photosynthesis and stomatal conductance on rising forest water-use efficiency 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (34) : 16909-16914
作者:  Guerrieri, Rossella;  Belmecheri, Soumaya;  Ollinger, Scott V.;  Asbjornsen, Heidi;  Jennings, Katie;  Xiao, Jingfeng;  Stocker, Benjamin D.;  Martin, Mary;  Hollinger, David Y.;  Bracho-Garrillo, Rosvel;  Clark, Kenneth;  Dore, Sabina;  Kolb, Thomas;  Munger, J. William;  Novick, Kimberly;  Richardson, Andrew D.
收藏  |  浏览/下载:34/0  |  提交时间:2019/11/27
tree rings  stable isotopes  water-use efficiency  AmeriFlux  CO2 fertilization  
Differential use of winter precipitation by upper and lower elevation Douglas fir in the Northern Rockies 期刊论文
GLOBAL CHANGE BIOLOGY, 2018, 24 (12) : 5607-5621
作者:  Martin, Justin;  Looker, Nathaniel;  Hoylman, Zachary;  Jencso, Kelsey;  Hu, Jia
收藏  |  浏览/下载:19/0  |  提交时间:2019/04/09
Douglas fir  growth  snowmelt  soil moisture  stable isotopes  water use  
Using Isotopic and Geochemical Tracers to Determine the Contribution of Glacier-Snow Meltwater to Streamflow in a Partly Glacierized Alpine-Gorge Catchment in Northeastern Qinghai-Tibet Plateau 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2018, 123 (18) : 10037-10056
作者:  Chang, Qixin;  Ma, Rui;  Sun, Ziyong;  Zhou, Aiguo;  Hu, Yalu;  Liu, Yanguang
收藏  |  浏览/下载:8/0  |  提交时间:2019/04/09
hydrograph separation  water stable isotopes  alpine-gorge catchments  glacier-snow meltwater  groundwater storage  glacier storage  
Disentangling the effects of crown scorch and competition release on the physiological and growth response of Pinus halepensis Mill. using delta C-13 and delta O-18 isotopes 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2018, 424: 276-287
作者:  Valor, Teresa;  Casals, Pere;  Altieri, Simona;  Ramon Gonzalez-Olabarria, Jose;  Pique, Miriam;  Battipaglia, Giovanna
收藏  |  浏览/下载:21/0  |  提交时间:2019/04/09
Aleppo pine  Prescribed burning  Scorched pines  Stable isotopes  Photosynthetic activity  Stomatal conductance  Tree-ring  Water use efficiency  
The "isohydric trap": A proposed feedback between water shortage, stomatal regulation, and nutrient acquisition drives differential growth and survival of European pines under climatic dryness 期刊论文
GLOBAL CHANGE BIOLOGY, 2018, 24 (9) : 4069-4083
作者:  Salazar-Tortosa, Diego;  Castro, Jorge;  Villar-Salvador, Pedro;  Vinegla, Benjamin;  Matias, Luis;  Michelsen, Anders;  Rubio de Casas, Rafael;  Querejeta, Jose I.
收藏  |  浏览/下载:19/0  |  提交时间:2019/04/09
climatic change  hotter drought  nutrients  stable isotopes  stoichiometry  stomatal behaviour  water use efficiency