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Landscape‐scale plant water content and carbon flux behavior following moisture pulses: from dryland to mesic environments 期刊论文
Water Resources Research, 2020
作者:  Andrew F. Feldman;  Apisada Chulakadabba;  Daniel J. Short Gianotti;  Dara Entekhabi
收藏  |  浏览/下载:7/0  |  提交时间:2020/12/22
Astronomy is—and has—a climate problem 期刊论文
Science, 2020
作者:  Daniel Clery
收藏  |  浏览/下载:4/0  |  提交时间:2020/10/12
The mud is electric 期刊论文
Science, 2020
作者:  Elizabeth Pennisi
收藏  |  浏览/下载:7/0  |  提交时间:2020/08/25
Reimagining petroleum refining 期刊论文
Science, 2020
作者:  Joan F. Brennecke;  Benny Freeman
收藏  |  浏览/下载:4/0  |  提交时间:2020/07/21
Microplastic in terrestrial ecosystems 期刊论文
Science, 2020
作者:  Matthias C. Rillig;  Anika Lehmann
收藏  |  浏览/下载:10/0  |  提交时间:2020/06/29
Plant hydraulics accentuates the effect of atmospheric moisture stress on transpiration 期刊论文
NATURE CLIMATE CHANGE, 2020, 10 (7) : 691-+
作者:  Liu, Yanlan;  Kumar, Mukesh;  Katul, Gabriel G.;  Feng, Xue;  Konings, Alexandra G.
收藏  |  浏览/下载:15/0  |  提交时间:2020/06/09
O-2 : CO2 exchange ratio for net turbulent flux observed in an urban area of Tokyo, Japan, and its application to an evaluation of anthropogenic CO2 emissions 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (9) : 5293-5308
作者:  Ishidoya, Shigeyuki;  Sugawara, Hirofumi;  Terao, Yukio;  Kaneyasu, Naoki;  Aoki, Nobuyuki;  Tsuboi, Kazuhiro;  Kondo, Hiroaki
收藏  |  浏览/下载:11/0  |  提交时间:2020/05/20
Earlier leaf-out warms air in the north 期刊论文
NATURE CLIMATE CHANGE, 2020, 10 (4) : 370-+
作者:  Xu, Xiyan;  Riley, William J.;  Koven, Charles D.;  Jia, Gensuo;  Zhang, Xiaoyan
收藏  |  浏览/下载:15/0  |  提交时间:2020/05/13
An orbital water-ice cycle on comet 67P from colour changes 期刊论文
NATURE, 2020, 578 (7793) : 49-+
作者:  Oh, Myoung Hwan;  Cho, Min Gee;  Chung, Dong Young;  Park, Inchul;  Kwon, Youngwook Paul;  Ophus, Colin;  Kim, Dokyoon;  Kim, Min Gyu;  Jeong, Beomgyun;  Gu, X. Wendy;  Jo, Jinwoung;  Yoo, Ji Mun;  Hong, Jaeyoung;  McMains, Sara;  Kang, Kisuk;  Sung, Yung-Eun;  Alivisatos, A. Paul;  Hyeon, Taeghwan
收藏  |  浏览/下载:52/0  |  提交时间:2020/07/03

Solar heating of a cometary surface provides the energy necessary to sustain gaseous activity, through which dust is removed(1,2). In this dynamical environment, both the coma(3,4) and the nucleus(5,6) evolve during the orbit, changing their physical and compositional properties. The environment around an active nucleus is populated by dust grains with complex and variegated shapes(7), lifted and diffused by gases freed from the sublimation of surface ices(8,9). The visible colour of dust particles is highly variable: carbonaceous organic material-rich grains(10) appear red while magnesium silicate-rich(11,12) and water-ice-rich(13,14) grains appear blue, with some dependence on grain size distribution, viewing geometry, activity level and comet family type. We know that local colour changes are associated with grain size variations, such as in the bluer jets made of submicrometre grains on comet Hale-Bopp(15) or in the fragmented grains in the coma(16) of C/1999 S4 (LINEAR). Apart from grain size, composition also influences the coma'  s colour response, because transparent volatiles can introduce a substantial blueing in scattered light, as observed in the dust particles ejected after the collision of the Deep Impact probe with comet 9P/Tempel 1(17). Here we report observations of two opposite seasonal colour cycles in the coma and on the surface of comet 67P/Churyumov-Gerasimenko through its perihelion passage(18). Spectral analysis indicates an enrichment of submicrometre grains made of organic material and amorphous carbon in the coma, causing reddening during the passage. At the same time, the progressive removal of dust from the nucleus causes the exposure of more pristine and bluish icy layers on the surface. Far from the Sun, we find that the abundance of water ice on the nucleus is reduced owing to redeposition of dust and dehydration of the surface layer while the coma becomes less red.