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Reply to: Multiple drivers of Miocene C(4)ecosystem expansions 期刊论文
NATURE GEOSCIENCE, 2020, 13 (7) : 465-+
作者:  Polissar, Pratigya J.;  Rose, Cassaundra;  Uno, Kevin T.;  Phelps, Samuel R.;  deMenocal, Peter
收藏  |  浏览/下载：6/0  |  提交时间：2020/07/06
A remnant planetary core in the hot-Neptune desert 期刊论文
NATURE, 2020, 583 (7814) : 39-+
作者:  David J. Armstrong;  Thé;  o A. Lopez;  Vardan Adibekyan;  Richard A. Booth;  Edward M. Bryant;  Karen A. Collins;  Magali Deleuil;  Alexandre Emsenhuber;  Chelsea X. Huang;  George W. King;  Jorge Lillo-Box;  Jack J. Lissauer;  Elisabeth Matthews;  Olivier Mousis;  Louise D. Nielsen;  Hugh Osborn;  Jon Otegi;  Nuno C. Santos;  Sé;  rgio G. Sousa;  Keivan G. Stassun;  Dimitri Veras;  Carl Ziegler;  Jack S. Acton;  Jose M. Almenara;  David R. Anderson;  David Barrado;  Susana C. C. Barros;  Daniel Bayliss;  Claudia Belardi;  Francois Bouchy;  Cé;  sar Briceñ;  o;  Matteo Brogi;  David J. A. Brown;  Matthew R. Burleigh;  Sarah L. Casewell;  Alexander Chaushev;  David R. Ciardi;  Kevin I. Collins;  Knicole D. Coló;  n;  Benjamin F. Cooke;  Ian J. M. Crossfield;  Rodrigo F. Dí;  az;  Elisa Delgado Mena;  Olivier D. S. Demangeon;  Caroline Dorn;  Xavier Dumusque;  Philipp Eigmü;  ller;  Michael Fausnaugh;  Pedro Figueira;  Tianjun Gan;  Siddharth Gandhi;  Samuel Gill;  Erica J. Gonzales;  Michael R. Goad;  Maximilian N. Gü;  nther;  Ravit Helled;  Saeed Hojjatpanah;  Steve B. Howell;  James Jackman;  James S. Jenkins;  Jon M. Jenkins;  Eric L. N. Jensen;  Grant M. Kennedy;  David W. Latham;  Nicholas Law;  Monika Lendl;  Michael Lozovsky;  Andrew W. Mann;  Maximiliano Moyano;  James McCormac;  Farzana Meru;  Christoph Mordasini;  Ares Osborn;  Don Pollacco;  Didier Queloz;  Liam Raynard;  George R. Ricker;  Pamela Rowden;  Alexandre Santerne;  Joshua E. Schlieder;  Sara Seager;  Lizhou Sha;  Thiam-Guan Tan;  Rosanna H. Tilbrook;  Eric Ting;  Sté;  phane Udry;  Roland Vanderspek;  Christopher A. Watson;  Richard G. West;  Paul A. Wilson;  Joshua N. Winn;  Peter Wheatley;  Jesus Noel Villasenor;  Jose I. Vines;  Zhuchang Zhan
收藏  |  浏览/下载：20/0  |  提交时间：2020/07/06

The interiors of giant planets remain poorly understood. Even for the planets in the Solar System, difficulties in observation lead to large uncertainties in the properties of planetary cores. Exoplanets that have undergone rare evolutionary processes provide a route to understanding planetary interiors. Planets found in and near the typically barren hot-Neptune '  desert'  (1,2)(a region in mass-radius space that contains few planets) have proved to be particularly valuable in this regard. These planets include HD149026b(3), which is thought to have an unusually massive core, and recent discoveries such as LTT9779b(4)and NGTS-4b(5), on which photoevaporation has removed a substantial part of their outer atmospheres. Here we report observations of the planet TOI-849b, which has a radius smaller than Neptune'  s but an anomalously large mass of39.1-2.6+2.7Earth masses and a density of5.2-0.8+0.7grams per cubic centimetre, similar to Earth'  s. Interior-structure models suggest that any gaseous envelope of pure hydrogen and helium consists of no more than3.9-0.9+0.8 per cent of the total planetary mass. The planet could have been a gas giant before undergoing extreme mass loss via thermal self-disruption or giant planet collisions, or it could have avoided substantial gas accretion, perhaps through gap opening or late formation(6). Although photoevaporation rates cannot account for the mass loss required to reduce a Jupiter-like gas giant, they can remove a small (a few Earth masses) hydrogen and helium envelope on timescales of several billion years, implying that any remaining atmosphere on TOI-849b is likely to be enriched by water or other volatiles from the planetary interior. We conclude that TOI-849b is the remnant core of a giant planet.


Observations of TOI-849b reveal a radius smaller than Neptune'  s but a large mass of about 40 Earth masses, indicating that the planet is the remnant core of a gas giant.


  
Estimating US fossil fuel CO2 emissions from measurements of C-14 in atmospheric CO2 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (24) : 13300-13307
作者:  Basu, Sourish;  Lehman, Scott J.;  Miller, John B.;  Andrews, Arlyn E.;  Sweeney, Colm;  Gurney, Kevin R.;  Xu, Xiaomei;  Southon, John;  Tans, Pieter P.
收藏  |  浏览/下载：14/0  |  提交时间：2020/06/09
fossil fuel CO2  radiocarbon  atmospheric inverse modeling  
Changes in Precipitation From North Atlantic Tropical Cyclones Under RCP Scenarios in the Variable-Resolution Community Atmosphere Model 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (12)
作者:  Stansfield, Alyssa M.;  Reed, Kevin A.;  Zarzycki, Colin M.
收藏  |  浏览/下载：6/0  |  提交时间：2020/06/01
climate change  tropical cyclones  climate  precipitation  
Turning connective tissue into neurons for 10 years 期刊论文
NATURE, 2020, 578 (7796) : 522-524
作者:  Acquaviva, Laurent;  Boekhout, Michiel;  Karasu, Mehmet E.;  Brick, Kevin;  Pratto, Florencia;  Li, Tao;  van Overbeek, Megan;  Kauppi, Liisa;  Camerini-Otero, R. Daniel;  Jasin, Maria;  Keeney, Scott
收藏  |  浏览/下载：11/0  |  提交时间：2020/07/03

An historic breakthrough that altered our understanding of cell fate.


A method for directly converting connective-tissue cells into neurons opened up a new branch of research into cell-based therapies and called into question long-held beliefs about how development affects a cell'  s identity.


  
Geography and Morphology Affect the Ice Duration Dynamics of Northern Hemisphere Lakes Worldwide 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (12)
作者:  Warne, Connor P. K.;  McCann, Kevin S.;  Rooney, Neil;  Cazelles, Kevin;  Guzzo, Matthew M.
收藏  |  浏览/下载：13/0  |  提交时间：2020/05/25
ice phenology  ice duration  limnology  time series  climate change  
A New Method to Construct a Horizontal Resolution-Dependent Wind Speed Adjustment Factor for Tropical Cyclones in Global Climate Model Simulations 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (11)
作者:  Moon, Yumin;  Kim, Daehyun;  Camargo, Suzana J.;  Wing, Allison A.;  Reed, Kevin A.;  Wehner, Michael F.;  Zhao, Ming
收藏  |  浏览/下载：10/0  |  提交时间：2020/05/25
tropical cyclones  global climate models  
Changes in Northern Hemisphere temperature variability shaped by regional warming patterns 期刊论文
NATURE GEOSCIENCE, 2020, 13 (6) : 414-+
作者:  Tamarin-Brodsky, Talia;  Hodges, Kevin;  Hoskins, Brian J.;  Shepherd, Theodore G.
收藏  |  浏览/下载：6/0  |  提交时间：2020/05/20
On the Functional Relationship Between Fluorescence and Photochemical Yields in Complex Evergreen Needleleaf Canopies 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (9)
作者:  Maguire, Andrew J.;  Eitel, Jan U. H.;  Griffin, Kevin L.;  Magney, Troy S.;  Long, Ryan A.;  Vierling, Lee A.;  Schmiege, Stephanie C.;  Jennewein, Jyoti S.;  Weygint, William A.;  Boelman, Natalie T.;  Bruner, Sarah G.
收藏  |  浏览/下载：8/0  |  提交时间：2020/07/02
canopy irradiance  evergreen needleleaf forest  light use efficiency  nonphotochemical quenching  
Increased drought severity tracks warming in the United States' largest river basin 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (21) : 11328-11336
作者:  Martin, Justin T.;  Pederson, Gregory T.;  Woodhouse, Connie A.;  Cook, Edward R.;  McCabe, Gregory J.;  Anchukaitis, Kevin J.;  Wise, Erika K.;  Erger, Patrick J.;  Dolan, Larry;  McGuire, Marketa;  Gangopadhyay, Subhrendu;  Chase, Katherine J.;  Littell, Jeremy S.;  Gray, Stephen T.;  George, Scott St.;  Friedman, Jonathan M.;  Sauchyn, David J.;  St-Jacques, Jeannine-Marie;  King, John
收藏  |  浏览/下载：14/0  |  提交时间：2020/05/13
drought severity  streamflow  temperature  precipitation  water resources