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国际研究发现河流会释放出储存千年的古碳 快报文章
气候变化快报,2025年第12期
作者:  裴惠娟
Microsoft Word(16Kb)  |  收藏  |  浏览/下载:368/0  |  提交时间:2025/06/20
Old Carbon  River  Land  
埋藏木材可作为一种持久的碳移除方法 快报文章
资源环境快报,2024年第19期
作者:  董利苹
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3775-year-old Wood Burial  “Wood Vaulting”  a Durable Carbon Removal Method  
A cold, massive, rotating disk galaxy 1.5 billion years after the Big Bang 期刊论文
NATURE, 2020, 581 (7808) : 269-+
作者:  Poplawski, Gunnar H. D.;  Kawaguchi, Riki;  Van Niekerk, Erna;  Lu, Paul;  Mehta, Neil;  Canete, Philip;  Lie, Richard;  Dragatsis, Ioannis;  Meves, Jessica M.;  Zheng, Binhai;  Coppola, Giovanni;  Tuszynski, Mark H.
收藏  |  浏览/下载:83/0  |  提交时间:2020/07/03

Massive disk galaxies like the Milky Way are expected to form at late times in traditional models of galaxy formation(1,2), but recent numerical simulations suggest that such galaxies could form as early as a billion years after the Big Bang through the accretion of cold material and mergers(3,4). Observationally, it has been difficult to identify disk galaxies in emission at high redshift(5,6) in order to discern between competing models of galaxy formation. Here we report imaging, with a resolution of about 1.3 kiloparsecs, of the 158-micrometre emission line from singly ionized carbon, the far-infrared dust continuum and the near-ultraviolet continuum emission from a galaxy at a redshift of 4.2603, identified by detecting its absorption of quasar light. These observations show that the emission arises from gas inside a cold, dusty, rotating disk with a rotational velocity of about 272 kilometres per second. The detection of emission from carbon monoxide in the galaxy yields a molecular mass that is consistent with the estimate from the ionized carbon emission of about 72 billion solar masses. The existence of such a massive, rotationally supported, cold disk galaxy when the Universe was only 1.5 billion years old favours formation through either cold-mode accretion or mergers, although its large rotational velocity and large content of cold gas remain challenging to reproduce with most numerical simulations(7,8).


A massive rotating disk galaxy was formed a mere 1.5 billion years after the Big Bang, a surprisingly short time after the origin of the Universe.


  
Spatial and temporal dynamics of 20th century carbon storage and emissions after wildfire in an old-growth forest landscape 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2019, 449
作者:  Harris, Lucas B.;  Scholl, Andrew E.;  Young, Amanda B.;  Estes, Becky L.;  Taylor, Alan H.
收藏  |  浏览/下载:20/0  |  提交时间:2019/11/27
Carbon storage  Carbon emissions  Carbon stability  Forest reconstruction  Wildfire  Old growth  Yosemite National Park  
Divergent long-term trends and interannual variation in ecosystem resource use efficiencies of a southern boreal old black spruce forest 1999-2017 期刊论文
GLOBAL CHANGE BIOLOGY, 2019, 25 (9) : 3056-3069
作者:  Liu, Peng;  Black, T. Andrew;  Jassal, Rachhpal S.;  Zha, Tianshan;  Nesic, Zoran;  Barr, Alan G.;  Helgason, Warren D.;  Jia, Xin;  Tian, Yun;  Stephens, Jilmarie J.;  Ma, Jingyong
收藏  |  浏览/下载:24/0  |  提交时间:2019/11/27
carbon use efficiency  climate change  gross ecosystem productivity  light use efficiency  long-term trends  Old Black Spruce  southern boreal forest  water use efficiency  
Trends and controls on water-use efficiency of an old-growth coniferous forest in the Pacific Northwest 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2019, 14 (7)
作者:  Jiang, Yueyang;  Still, Christopher J.;  Rastogi, Bharat;  Page, Gerald F. M.;  Wharton, Sonia;  Meinzer, Frederick C.;  Voelker, Steven;  Kim, John B.
收藏  |  浏览/下载:12/0  |  提交时间:2019/11/27
water-use efficiency  carbon and water fluxes  old-growth coniferous forest  drought  climatic change  
Effects of tree size heterogeneity on carbon sink in old forests 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2019, 432: 637-648
作者:  Shu, Shu-miao;  Zhu, Wan-ze;  Wang, Wen-zhi;  Jia, Min;  Zhang, Yuan-yuan;  Sheng, Zhe-liang
收藏  |  浏览/下载:15/0  |  提交时间:2019/04/09
Carbon sink  Carbon use efficiency  Carbon neutral hypothesis  Old forest  Individual size  Subalpine fir forest