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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.


  
Increased drought severity tracks warming in the United States' largest river basin 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (21) : 11328-11336
作者:  Martin, Justin T.;  Pederson, Gregory T.;  Woodhouse, Connie A.;  Cook, Edward R.;  McCabe, Gregory J.;  Anchukaitis, Kevin J.;  Wise, Erika K.;  Erger, Patrick J.;  Dolan, Larry;  McGuire, Marketa;  Gangopadhyay, Subhrendu;  Chase, Katherine J.;  Littell, Jeremy S.;  Gray, Stephen T.;  George, Scott St.;  Friedman, Jonathan M.;  Sauchyn, David J.;  St-Jacques, Jeannine-Marie;  King, John
收藏  |  浏览/下载:14/0  |  提交时间:2020/05/13
drought severity  streamflow  temperature  precipitation  water resources  
Linear correction method for improved atmospheric vertical profile retrieval based on ground-based microwave radiometer 期刊论文
ATMOSPHERIC RESEARCH, 2020, 232
作者:  Zhao, Yuxin;  Yan, Hualong;  Wu, Peng;  Zhou, Di
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/02
Atmospheric profile retrieval  Brightness temperature correction  Linear regression  Vertical temperature  Water vapor profiles  
Scale Analysis of Moist Thermodynamics in a Simple Model and the Relationship between Moisture Modes and Gravity Waves 期刊论文
JOURNAL OF THE ATMOSPHERIC SCIENCES, 2019, 76 (12) : 3863-3881
作者:  Adames, Angel F.;  Kim, Daehyun;  Clark, Spencer K.;  Ming, Yi;  Inoue, Kuniaki
收藏  |  浏览/下载:10/0  |  提交时间:2020/02/17
Convective adjustment  Gravity waves  Waves  atmospheric  Temperature  Water vapor  
An improved retrieval method of atmospheric parameter profiles based on the BP neural network 期刊论文
ATMOSPHERIC RESEARCH, 2018, 213: 389-397
作者:  Zhao, Yuxin;  Zhou, Di;  Yan, Hualong
收藏  |  浏览/下载:7/0  |  提交时间:2019/04/09
Artificial neural network  Jacobian matrix  Layered retrieval method  Vertical temperature and water vapor profiles  
A hail climatology in South Korea 期刊论文
ATMOSPHERIC RESEARCH, 2017, 188
作者:  Jin, Han-Gyul;  Lee, Hyunho;  Lkhamjav, Jambajamts;  Baik, Jong-Jin
收藏  |  浏览/下载:6/0  |  提交时间:2019/04/09
Hail climatology  South Korea  Temperature lapse rate  Water vapor mixing ratio  Convective available potential energy (CAPE)  Bulk wind shear  
Numerical study on the effect of charge separation at low cloud temperature and effective water content on thunderstorm electrification 期刊论文
ATMOSPHERIC RESEARCH, 2017, 184: 43479
作者:  Tsenova, Boryana Dimitrova;  Barakova, Denitsa;  Mitzeva, Rumjana
收藏  |  浏览/下载:5/0  |  提交时间:2019/04/09
Numerical simulations  Thunderclouds electrification  Low water content  Low cloud temperature  Parameterizations  
FINAL PROJECT REPORT: A Geophysical Characterization & Monitoring Strategy for Determining Hydrologic Processes in the Hyporheic Corridor at the Hanford 300-Area 科技报告
来源:US Department of Energy (DOE). 出版年: 2011
作者:  Wolery, T J;  Tayne, A;  Jove-Colon, C F
收藏  |  浏览/下载:7/0  |  提交时间:2019/04/05
surface water/groundwater interaction  Hanford 300 area  electrical geophysics  distributed temperature sensing