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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.


  
High ice concentration observed in tropical maritime stratiform mixed-phase clouds with top temperatures warmer than-8 degrees C 期刊论文
ATMOSPHERIC RESEARCH, 2020, 233
作者:  Yang, Jing;  Wang, Zhien;  Heymsfield, Andrew J.;  DeMott, Paul J.;  Twohy, Cynthia H.;  Suski, Kaitlyn J.;  Toohey, Darin W.
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/02
High ice concentration  Stratiform cloud  Warm temperature  Aircraft observation  Parcel model simulation  
Eastern Mediterranean summer temperatures since 730 CE from Mt. Smolikas tree-ring densities 期刊论文
CLIMATE DYNAMICS, 2019
作者:  Esper, Jan;  Klippel, Lara;  Krusic, Paul J.;  Konter, Oliver;  Raible, Christoph C.;  Xoplaki, Elena;  Luterbacher, Juerg;  Buentgen, Ulf
收藏  |  浏览/下载:7/0  |  提交时间:2020/02/17
Temperature reconstruction  Pinus heldreichii  Maximum latewood density  Medieval warm period  Orbital forcing  Greece  
The influence of ENSO on the upper warm temperature anomaly formation associated with the March-May heavy rainfall events in Tanzania 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019
作者:  Mafuru, Kantamla B.;  Tan Guirong
收藏  |  浏览/下载:6/0  |  提交时间:2020/02/17
ENSO  heavy rainfall in Tanzania  upper warm temperature anomaly  Walker circulation  
Effect of El Nino on the response ratio of Hadley circulation to different SST meridional structures 期刊论文
CLIMATE DYNAMICS, 2019, 53: 3877-3891
作者:  Feng, Juan;  Li, Jianping;  Jin, Fei-Fei;  Liu, Zhengyu;  Zhao, Sen
收藏  |  浏览/下载:9/0  |  提交时间:2019/11/27
Hadley circulation  Sea surface temperature  Equatorially asymmetric  Equatorially symmetric  Indo-Pacific warm pool  
Large-Scale Circulation Anomalies Associated with Extreme Heat in South Korea and Southern-Central Japan 期刊论文
JOURNAL OF CLIMATE, 2019, 32 (10) : 2747-2759
作者:  Xu, Ke;  Lu, Riyu;  Kim, Baek-Jo;  Park, Jong-Kil;  Mao, Jiangyu;  Byon, Jae-Young;  Chen, Ruidan;  Kim, Eun-Byul
收藏  |  浏览/下载:9/0  |  提交时间:2019/11/26
Asia  Atmospheric circulation  Extreme events  Summer  warm season  Temperature  
On the relationship between the risk of hoar frost on roads and a changing climate in Sweden 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019, 39 (5) : 2601-2611
作者:  Ou, Tinghai;  Hu, Yumei;  Gustavsson, Torbjoern;  Bogren, Joergen
收藏  |  浏览/下载:12/0  |  提交时间:2019/11/26
changing climate  hoar frost risk  radiative cooling  road surface temperature  temperature gradient  warm air advection  
Big Jump of Record Warm Global Mean Surface Temperature in 2014-2016 Related to Unusually Large Oceanic Heat Releases 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (2) : 1069-1078
作者:  Yin, Jianjun;  Overpeck, Jonathan;  Peyser, Cheryl;  Stouffer, Ronald
收藏  |  浏览/下载:9/0  |  提交时间:2019/04/09
record warm global temperature  ocean heat release  El Nino  model simulation and projection  
Teleconnections of the tropical sea surface temperatures to the surface air temperature over Saudi Arabia in summer season 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2017, 37 (2)
作者:  Hasanean, H. M.;  Almazroui, M.
收藏  |  浏览/下载:6/0  |  提交时间:2019/04/09
surface air temperature  sea surface temperature  teleconnection  Saudi Arabia  Indo-Pacific warm pool index  tropical North Atlantic index  tropical South Atlantic index  Western Hemisphere warm pool index