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Visibility as a proxy for air quality in East Africa 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (8)
作者:  Singh, Ajit;  Avis, William R.;  Pope, Francis D.
收藏  |  浏览/下载:15/0  |  提交时间:2020/08/18
visibility  air pollution  environmental kuznet'  s curve  particulate matter  East Africa  PM  
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:20/0  |  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.


  
Carbon loss from northern circumpolar permafrost soils amplified by rhizosphere priming 期刊论文
NATURE GEOSCIENCE, 2020
作者:  Keuper, Frida;  Wild, Birgit;  Kummu, Matti;  Beer, Christian;  Blume-Werry, Gesche;  Fontaine, Sebastien;  Gavazov, Konstantin;  Gentsch, Norman;  Guggenberger, Georg;  Hugelius, Gustaf;  Jalava, Mika;  Koven, Charles;  Krab, Eveline J.;  Kuhry, Peter;  Monteux, Sylvain;  Richter, Andreas;  Shahzad, Tanvir;  Weedon, James T.;  Dorrepaal, Ellen
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/09
Erythemal Radiation, Column Ozone, and the North American Monsoon 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Schoeberl, M. R.;  Pfister, L.;  Wang, T.;  Kummer, J.;  Dessler, A. E.;  Yu, W.
收藏  |  浏览/下载:6/0  |  提交时间:2020/08/18
erythemal  convection  monsoon  
Multimodel Future Projections of the Regional Vegetation-Climate System Over East Asia: Comparison Between Two Ensemble Approaches 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Liu, Weiguang;  Wang, Guiling;  Yu, Miao;  Chen, Haishan;  Jiang, Yelin
收藏  |  浏览/下载:14/0  |  提交时间:2020/08/18
climate change  East Asia  multimodel ensemble  vegetation-climate interactions  
Progressive nitrogen limitation across the Tibetan alpine permafrost region 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Kou, Dan;  Yang, Guibiao;  Li, Fei;  Feng, Xuehui;  Zhang, Dianye;  Mao, Chao;  Zhang, Qiwen;  Peng, Yunfeng;  Ji, Chengjun;  Zhu, Qiuan;  Fang, Yunting;  Liu, Xueyan;  Xu-Ri;  Li, Siqi;  Deng, Jia;  Zheng, Xunhua;  Fang, Jingyun;  Yang, Yuanhe
收藏  |  浏览/下载:18/0  |  提交时间:2020/07/06
Mowing alters nitrogen effects on the community-level plant stoichiometry through shifting plant functional groups in a semi-arid grassland 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (7)
作者:  Li, Shijie;  Wang, Fuwei;  Chen, Mengfei;  Liu, Zhengyi;  Zhou, Luyao;  Deng, Jun;  Dong, Changjun;  Bao, Guocheng;  Bai, Tongshuo;  Li, Zhen;  Guo, Hui;  Wang, Yi;  Qiu, Yunpeng;  Hu, Shuijin
收藏  |  浏览/下载:8/0  |  提交时间:2020/08/18
Nitrogen fertilization  mowing  plant stoichiometry  plant community structure  plant diversity  photosynthetic active radiation  gross ecosystem productivity  
Heatwave effects on gross primary production of northern mid-latitude ecosystems 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (7)
作者:  Xu, Hang;  Xiao, Jingfeng;  Zhang, Zhiqiang
收藏  |  浏览/下载:13/0  |  提交时间:2020/08/18
heat wave  photosynthesis  biophysical regulations  drought  ecosystem type  plant functional type  FLUXNET  
The potential for REDD plus to reduce forest degradation in Vietnam 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (7)
作者:  Ngo, D. T.;  Le, A., V;  Le, H. T.;  Stas, S. M.;  Le, T. C.;  Tran, H. D.;  Pham, T.;  Le, T. T.;  Spracklen, B. D.;  Langan, C.;  Cuthbert, R.;  Buermann, W.;  Phillips, O. L.;  Jew, E. K. K.;  Spracklen, D., V
收藏  |  浏览/下载:9/0  |  提交时间:2020/08/18
forest degradation  REDD plus  livelihoods  
Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (7)
作者:  Song, Chunlin;  Wang, Genxu;  Haghipour, Negar;  Raymond, Peter A.
收藏  |  浏览/下载:10/0  |  提交时间:2020/08/18
riverine carbon export  radiocarbon  stable carbon isotope  permafrost  Qinghai-Tibet Plateau river  climate warming