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A Machine-Learning Approach to Derive Long-Term Trends of Thermospheric Density 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (6)
作者:  Weng, Libin;  Lei, Jiuhou;  Zhong, Jiahao;  Dou, Xiankang;  Fang, Hanxian
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/02
thermospheric density  Long-term trend  Artificial Neural Network method  solar activity  
Asynchronous carbon sink saturation in African and Amazonian tropical forests 期刊论文
NATURE, 2020, 579 (7797) : 80-+
作者:  Wannes Hubau;  Simon L. Lewis;  Oliver L. Phillips;  Kofi Affum-Baffoe;  Hans Beeckman;  Aida Cuní;  -Sanchez;  Armandu K. Daniels;  Corneille E. N. Ewango;  Sophie Fauset;  Jacques M. Mukinzi;  Douglas Sheil;  Bonaventure Sonké;  Martin J. P. Sullivan;  Terry C. H. Sunderland;  Hermann Taedoumg;  Sean C. Thomas;  Lee J. T. White;  Katharine A. Abernethy;  Stephen Adu-Bredu;  Christian A. Amani;  Timothy R. Baker;  Lindsay F. Banin;  Fidè;  le Baya;  Serge K. Begne;  Amy C. Bennett;  Fabrice Benedet;  Robert Bitariho;  Yannick E. Bocko;  Pascal Boeckx;  Patrick Boundja;  Roel J. W. Brienen;  Terry Brncic;  Eric Chezeaux;  George B. Chuyong;  Connie J. Clark;  Murray Collins;  James A. Comiskey;  David A. Coomes;  Greta C. Dargie;  Thales de Haulleville;  Marie Noel Djuikouo Kamdem;  Jean-Louis Doucet;  Adriane Esquivel-Muelbert;  Ted R. Feldpausch;  Alusine Fofanah;  Ernest G. Foli;  Martin Gilpin;  Emanuel Gloor;  Christelle Gonmadje;  Sylvie Gourlet-Fleury;  Jefferson S. Hall;  Alan C. Hamilton;  David J. Harris;  Terese B. Hart;  Mireille B. N. Hockemba;  Annette Hladik;  Suspense A. Ifo;  Kathryn J. Jeffery;  Tommaso Jucker;  Emmanuel Kasongo Yakusu;  Elizabeth Kearsley;  David Kenfack;  Alexander Koch;  Miguel E. Leal;  Aurora Levesley;  Jeremy A. Lindsell;  Janvier Lisingo;  Gabriela Lopez-Gonzalez;  Jon C. Lovett;  Jean-Remy Makana;  Yadvinder Malhi;  Andrew R. Marshall;  Jim Martin;  Emanuel H. Martin;  Faustin M. Mbayu;  Vincent P. Medjibe;  Vianet Mihindou;  Edward T. A. Mitchard;  Sam Moore;  Pantaleo K. T. Munishi;  Natacha Nssi Bengone;  Lucas Ojo;  Fidè;  le Evouna Ondo;  Kelvin S.-H. Peh;  Georgia C. Pickavance;  Axel Dalberg Poulsen;  John R. Poulsen;  Lan Qie;  Jan Reitsma;  Francesco Rovero;  Michael D. Swaine;  Joey Talbot;  James Taplin;  David M. Taylor;  Duncan W. Thomas;  Benjamin Toirambe;  John Tshibamba Mukendi;  Darlington Tuagben;  Peter M. Umunay;  Geertje M. F. van der Heijden;  Hans Verbeeck;  Jason Vleminckx;  Simon Willcock;  Hannsjö;  rg Wö;  ll;  John T. Woods;  Lise Zemagho
收藏  |  浏览/下载:23/0  |  提交时间:2020/05/13

Structurally intact tropical forests sequestered about half of the global terrestrial carbon uptake over the 1990s and early 2000s, removing about 15 per cent of anthropogenic carbon dioxide emissions(1-3). Climate-driven vegetation models typically predict that this tropical forest '  carbon sink'  will continue for decades(4,5). Here we assess trends in the carbon sink using 244 structurally intact African tropical forests spanning 11 countries, compare them with 321 published plots from Amazonia and investigate the underlying drivers of the trends. The carbon sink in live aboveground biomass in intact African tropical forests has been stable for the three decades to 2015, at 0.66 tonnes of carbon per hectare per year (95 per cent confidence interval 0.53-0.79), in contrast to the long-term decline in Amazonian forests(6). Therefore the carbon sink responses of Earth'  s two largest expanses of tropical forest have diverged. The difference is largely driven by carbon losses from tree mortality, with no detectable multi-decadal trend in Africa and a long-term increase in Amazonia. Both continents show increasing tree growth, consistent with the expected net effect of rising atmospheric carbon dioxide and air temperature(7-9). Despite the past stability of the African carbon sink, our most intensively monitored plots suggest a post-2010 increase in carbon losses, delayed compared to Amazonia, indicating asynchronous carbon sink saturation on the two continents. A statistical model including carbon dioxide, temperature, drought and forest dynamics accounts for the observed trends and indicates a long-term future decline in the African sink, whereas the Amazonian sink continues to weaken rapidly. Overall, the uptake of carbon into Earth'  s intact tropical forests peaked in the 1990s. Given that the global terrestrial carbon sink is increasing in size, independent observations indicating greater recent carbon uptake into the Northern Hemisphere landmass(10) reinforce our conclusion that the intact tropical forest carbon sink has already peaked. This saturation and ongoing decline of the tropical forest carbon sink has consequences for policies intended to stabilize Earth'  s climate.


  
Long-term trends of global maximum atmospheric mixed layer heights derived from radiosonde measurements 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (3)
作者:  Li, Jing;  Chu, Yiqi;  Li, Xichen;  Dong, Yueming
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/02
mixed layer height  parcel method  temperature lapse rate  diurnal temperature range  long term trend  
Atmospheric CH3CCl3 observations in China: Historical trends and implications 期刊论文
ATMOSPHERIC RESEARCH, 2020, 231
作者:  Yu, Dajiang;  39;Doherty, Simon
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/02
CH3CCl3  Atmospheric mixing ratios  Background levels  Long-term trend  Emissions  
Antarctic sea-ice variation associated with vertical geopotential height and temperature anomalies 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019, 39 (14) : 5380-5395
作者:  Qian, Weihong;  Wu, Kaijun;  Leung, Jeremy Cheuk-Hin
收藏  |  浏览/下载:8/0  |  提交时间:2020/02/17
Antarctica sea ice anomaly  extreme year  geopotential height anomaly  long-term trend  temperature anomaly  
Extratropical cyclones over East Asia: climatology, seasonal cycle, and long-term trend 期刊论文
CLIMATE DYNAMICS, 2019
作者:  Lee, Jaeyeon;  Son, Seok-Woo;  Cho, Hyeong-Oh;  Kim, Junsu;  Cha, Dong-Hyun;  Gyakum, John R.;  Chen, Deliang
收藏  |  浏览/下载:8/0  |  提交时间:2020/02/17
Extratropical cyclone (ETC)  East Asia  Lagrangian tracking algorithm  Climatology  Seasonal cycle  Long-term trend  
Multidecadal Change of the Mindanao Current: Is There a Robust Trend? 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (12) : 6755-6764
作者:  Duan, Jing;  Li, Yuanlong;  Wang, Fan;  Chen, Zhaohui
收藏  |  浏览/下载:8/0  |  提交时间:2019/11/26
Mindanao Current  long-term trend  Pacific trade winds  North Equatorial Current  Mindanao Dome  
Urban Expansion and Drying Climate in an Urban Agglomeration of East China 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (12) : 6868-6877
作者:  Luo, Ming;  Lau, Ngar-Cheung
收藏  |  浏览/下载:9/0  |  提交时间:2019/11/26
atmospheric humidity  urban dry island  long-term trend  urban expansion  urbanization effect  climate change  
Impacts of land cover and land use change on long-term trend of land surface phenology: a case study in agricultural ecosystems 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2019, 14 (4)
作者:  Zhang, Xiaoyang;  Liu, Lingling;  Henebry, Geoffrey M.
收藏  |  浏览/下载:5/0  |  提交时间:2019/11/26
land surface phenology  land cover and land use change  climate change  long-term trend  agriculatural ecosystems  
Corrections of Radiosonde-Based Precipitable Water Using Ground-Based GPS and Applications on Historical Radiosonde Data Over China 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2019, 124 (6) : 3208-3222
作者:  Zhang, Weixing;  Lou, Yidong;  Cao, Yunchang;  Liang, Hong;  Shi, Chuang;  Huang, Jinfang;  Liu, Wenxuan;  Zhang, Yong;  Fan, Binbin
收藏  |  浏览/下载:9/0  |  提交时间:2019/11/26
water vapor  GNSS  radiosonde  homogenization  long-term trend