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Temperate biocrusts: mesic counterparts to their better-known dryland cousins 期刊论文
FRONTIERS IN ECOLOGY AND THE ENVIRONMENT, 2020
作者:  Corbin, Jeffrey D.;  Thiet, Rachel K.
收藏  |  浏览/下载:13/0  |  提交时间:2020/08/18
Persistence of soil organic carbon caused by functional complexity 期刊论文
NATURE GEOSCIENCE, 2020
作者:  Lehmann, Johannes;  Hansel, Colleen M.;  Kaiser, Christina;  Kleber, Markus;  Maher, Kate;  Manzoni, Stefano;  Nunan, Naoise;  Reichstein, Markus;  Schimel, Joshua P.;  Torn, Margaret S.;  Wieder, William R.;  Koegel-Knabner, Ingrid
收藏  |  浏览/下载:11/0  |  提交时间:2020/08/09
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:18/0  |  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.


  
Study of the dependence of long-term stratospheric ozone trends on local solar time 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (14) : 8453-8471
作者:  Barras, Eliane Maillard;  Haefele, Alexander;  Nguyen, Liliane;  Tummon, Fiona;  Ball, William T.;  Rozanov, Eugene, V;  Rufenacht, Rolf;  Hocke, Klemens;  Bernet, Leonie;  Kampfer, Niklaus;  Nedoluha, Gerald;  Boyd, Ian
收藏  |  浏览/下载:33/0  |  提交时间:2020/08/09
Late Cenozoic climate change paces landscape adjustments to Yukon River capture 期刊论文
NATURE GEOSCIENCE, 2020
作者:  Bender, Adrian M.;  Lease, Richard O.;  Corbett, Lee B.;  Bierman, Paul R.;  Caffee, Marc W.;  Rittenour, Tammy M.
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/09
Response of surface shortwave cloud radiative effect to greenhouse gases and aerosols and its impact on summer maximum temperature 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (13) : 8251-8266
作者:  Tang, Tao;  Shindell, Drew;  Zhang, Yuqiang;  Voulgarakis, Apostolos;  Lamarque, Jean-Francois;  Myhre, Gunnar;  Stjern, Camilla W.;  Faluvegi, Gregory;  Samset, Bjorn H.
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/21
A process-based metacommunity framework linking local and regional scale community ecology 期刊论文
ECOLOGY LETTERS, 2020
作者:  Thompson, Patrick L.;  Guzman, Laura Melissa;  De Meester, Luc;  Horvath, Zsofia;  Ptacnik, Robert;  Vanschoenwinkel, Bram;  Viana, Duarte S.;  Chase, Jonathan M.
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/21
Abiotic niche  coexistence  competition  dispersal  diversity  environmental change  functioning  stability  temporal  
On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Naud, Catherine M.;  Booth, James F.;  Lamer, Katia;  Marchand, Roger;  Protat, Alain;  McFarquhar, Greg M.
收藏  |  浏览/下载:11/0  |  提交时间:2020/08/18
low-level clouds  southern ocean  MCAO M-index  CAM6  boundary layer stability  
Climate From the McMurdo Dry Valleys, Antarctica, 1986-2017: Surface Air Temperature Trends and Redefined Summer Season 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Obryk, M. K.;  Doran, P. T.;  Fountain, A. G.;  Myers, M.;  McKay, C. P.
收藏  |  浏览/下载:5/0  |  提交时间:2020/08/18
McMurdo Dry Valleys  weather observations  summer season  
Spatial resolution and location impact group structure in a marine food web 期刊论文
ECOLOGY LETTERS, 2020
作者:  Ohlsson, Mikael;  Eklof, Anna
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/14
Communities  ecological networks  food webs  group model  group structure  spatial location  spatial resolution