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Nightside condensation of iron in an ultrahot giant exoplanet 期刊论文
NATURE, 2020, 580 (7805) : 597-+
作者:  Lu, Zhihao;  Zou, Jianling;  Li, Shuang;  Topper, Michael J.;  Tao, Yong;  Zhang, Hao;  Jiao, Xi;  Xie, Wenbing;  Kong, Xiangqian;  Vaz, Michelle;  Li, Huili;  Cai, Yi;  Xia, Limin;  Huang, Peng;  Rodgers, Kristen;  Lee, Beverly;  Riemer, Joanne B.;  Day, Chi-Ping;  Yen, Ray-Whay Chiu;  Cui, Ying;  Wang, Yujiao;  Wang, Yanni;  Zhang, Weiqiang;  Easwaran, Hariharan;  Hulbert, Alicia;  Kim, KiBem;  Juergens, Rosalyn A.;  Yang, Stephen C.;  Battafarano, Richard J.;  Bush, Errol L.;  Broderick, Stephen R.;  Cattaneo, Stephen M.;  Brahmer, Julie R.;  Rudin, Charles M.;  Wrangle, John;  Mei, Yuping;  Kim, Young J.;  Zhang, Bin;  Wang, Ken Kang-Hsin;  Forde, Patrick M.;  Margolick, Joseph B.;  Nelkin, Barry D.;  Zahnow, Cynthia A.;  Pardoll, Drew M.;  Housseau, Franck;  Baylin, Stephen B.;  Shen, Lin;  Brock, Malcolm V.
收藏  |  浏览/下载：58/0  |  提交时间：2020/07/03

Ultrahot giant exoplanets receive thousands of times Earth'  s insolation(1,2). Their high-temperature atmospheres (greater than 2,000 kelvin) are ideal laboratories for studying extreme planetary climates and chemistry(3-5). Daysides are predicted to be cloud-free, dominated by atomic species(6) and much hotter than nightsides(5,7,8). Atoms are expected to recombine into molecules over the nightside(9), resulting in different day and night chemistries. Although metallic elements and a large temperature contrast have been observed(10-14), no chemical gradient has been measured across the surface of such an exoplanet. Different atmospheric chemistry between the day-to-night ('  evening'  ) and night-to-day ('  morning'  ) terminators could, however, be revealed as an asymmetric absorption signature during transit(4,7,15). Here we report the detection of an asymmetric atmospheric signature in the ultrahot exoplanet WASP-76b. We spectrally and temporally resolve this signature using a combination of high-dispersion spectroscopy with a large photon-collecting area. The absorption signal, attributed to neutral iron, is blueshifted by -11 +/- 0.7 kilometres per second on the trailing limb, which can be explained by a combination of planetary rotation and wind blowing from the hot dayside(16). In contrast, no signal arises from the nightside close to the morning terminator, showing that atomic iron is not absorbing starlight there. We conclude that iron must therefore condense during its journey across the nightside.


Absorption lines of iron in the dayside atmosphere of an ultrahot giant exoplanet disappear after travelling across the nightside, showing that the iron has condensed during its travel.


  
Increased high-latitude photosynthetic carbon gain offset by respiration carbon loss during an anomalous warm winter to spring transition 期刊论文
GLOBAL CHANGE BIOLOGY, 2019
作者:  Liu, Zhihua;  Kimball, John S.;  Parazoo, Nicholas C.;  Ballantyne, Ashley P.;  Wang, Wen J.;  Madani, Nima;  Pan, Caleb G.;  Watts, Jennifer D.;  Reichle, Rolf H.;  Sonnentag, Oliver;  Marsh, Philip;  Hurkuck, Miriam;  Helbig, Manuel;  Quinton, William L.;  Zona, Donatella;  Ueyama, Masahito;  Kobayashi, Hideki;  Euskirchen, Eugenie S.
收藏  |  浏览/下载：12/0  |  提交时间：2019/11/27
ABoVE  boreal  carbon cycle  climate change  productivity  respiration  SMAP L4C  soil moisture  tundra  
Effects of 21st-century climate, land use, and disturbances on ecosystem carbon balance in California 期刊论文
GLOBAL CHANGE BIOLOGY, 2019, 25 (10) : 3334-3353
作者:  Sleeter, Benjamin M.;  Marvin, David C.;  Cameron, D. Richard;  Selmants, Paul C.;  Westerline, A. LeRoy;  Kreitler, Jason;  Daniel, Colin J.;  Liu, Jinxun;  Wilson, Tamara S.
收藏  |  浏览/下载：6/0  |  提交时间：2019/11/27
California  carbon balance  climate change  disturbance  land use  scenarios  
The human imperative of stabilizing global climate change at 1.5 degrees C 期刊论文
SCIENCE, 2019, 365 (6459) : 1263-+
作者:  Hoegh-Guldberg, O.;  Jacob, D.;  Taylor, M.;  Bolanos, T. Guillen;  Bindi, M.;  Brown, S.;  Camilloni, I. A.;  Diedhiou, A.;  Djalante, R.;  Ebi, K.;  Engelbrecht, F.;  Guiot, J.;  Hijioka, Y.;  Mehrotra, S.;  Hope, C. W.;  Payne, A. J.;  Poertner, H. -O.;  Seneviratne, S. I.;  Thomas, A.;  Warren, R.;  Zhou, G.
收藏  |  浏览/下载：10/0  |  提交时间：2019/11/27
Surprising lack of sensitivity of biochemical limitation of photosynthesis of nine tree species to open-air experimental warming and reduced rainfall in a southern boreal forest 期刊论文
GLOBAL CHANGE BIOLOGY, 2019
作者:  Stefanski, Artur;  Bermudez, Raimundo;  Sendall, Kerrie M.;  Montgomery, Rebecca A.;  Reich, Peter B.
收藏  |  浏览/下载：8/0  |  提交时间：2019/11/27
B4WarmED  biochemical limitation  boreal forest  experimental warming  J(max)  rainfall reduction  V-cmax  
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：7/0  |  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  
Accumulation of soil carbon under elevated CO2 unaffected by warming and drought 期刊论文
GLOBAL CHANGE BIOLOGY, 2019, 25 (9) : 2970-2977
作者:  Dietzen, Christiana A.;  Larsen, Klaus Steenberg;  Ambus, Per L.;  Michelsen, Anders;  Arndal, Marie Frost;  Beier, Claus;  Reinsch, Sabine;  Schmidt, Inger Kappel
收藏  |  浏览/下载：8/0  |  提交时间：2019/11/27
climate driver interactions  drought  elevated CO2  FACE  multifactor climate change experiment  soil carbon  warming  
Autumn bird migration phenology: A potpourri of wind, precipitation and temperature effects 期刊论文
GLOBAL CHANGE BIOLOGY, 2019
作者:  Haest, Birgen;  Hueppop, Ommo;  van de Pol, Martijn;  Bairlein, Franz
收藏  |  浏览/下载：7/0  |  提交时间：2019/11/27
bird migration  environmental plasticity  fall  Helgoland  radar  rainfall  spatiotemporal analysis  time window analysis  
Maximum carbon uptake rate dominates the interannual variability of global net ecosystem exchange 期刊论文
GLOBAL CHANGE BIOLOGY, 2019, 25 (10) : 3381-3394
作者:  Fu, Zheng;  Stoy, Paul C.;  Poulter, Benjamin;  Gerken, Tobias;  Zhang, Zhen;  Wakbulcho, Guta;  Niu, Shuli
收藏  |  浏览/下载：13/0  |  提交时间：2019/11/27
carbon uptake period  interannual variability  maximum carbon uptake rate  net ecosystem exchange  phenology  physiology  
The climatic drivers of primary Picea forest growth along the Carpathian arc are changing under rising temperatures 期刊论文
GLOBAL CHANGE BIOLOGY, 2019, 25 (9) : 3136-3150
作者:  Schurman, Jonathan S.;  Babst, Flurin;  Bjorklund, Jesper;  Rydval, Milos;  Bace, Radek;  Cada, Vojtech;  Janda, Pavel;  Mikolas, Martin;  Saulnier, Melanie;  Trotsiuk, Volodymyr;  Svoboda, Miroslav
收藏  |  浏览/下载：13/0  |  提交时间：2019/11/27
Carpathian arc  climate change  climate sensitivity  growth trends  montane temperate forest  Picea abies  primary forest  synchrony