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Title: Disentangling climatic and anthropogenic controls on global terrestrial evapotranspiration trends

Here, we examined natural and anthropogenic controls on terrestrial evapotranspiration (ET) changes from 1982-2010 using multiple estimates from remote sensing-based datasets and process-oriented land surface models. A significant increased trend of ET in each hemisphere was consistently revealed by observationally-constrained data and multi-model ensembles that considered historic natural and anthropogenic drivers. The climate impacts were simulated to determine the spatiotemporal variations in ET. Globally, rising CO2 ranked second in these models after the predominant climatic influences, and yielded a decreasing trend in canopy transpiration and ET, especially for tropical forests and high-latitude shrub land. Increased nitrogen deposition slightly amplified global ET via enhanced plant growth. Land-use-induced ET responses, albeit with substantial uncertainties across the factorial analysis, were minor globally, but pronounced locally, particularly over regions with intensive land-cover changes. Our study highlights the importance of employing multi-stream ET and ET-component estimates to quantify the strengthening anthropogenic fingerprint in the global hydrologic cycle.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [2] ;  [1] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [1] ;  [5] ;  [1] more »;  [11] ;  [9] ;  [6] ;  [12] ;  [13] ;  [1] ;  [14] ;  [7] ;  [15] ;  [3] ;  [16] ;  [10] ;  [17] ;  [18] ;  [18] ;  [19] ;  [19] ;  [4] ;  [20] ;  [16] ;  [21] « less
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Texas, Austin, TX (United States)
  3. California Institute of Technology, Pasadena, CA (United States)
  4. Peking Univ., Beijing (People's Republic of China)
  5. Beijing Normal Univ., Beijing (People's Republic of China)
  6. Northern Arizona Univ., Flagstaff, AZ (United States)
  7. Auburn Univ., Auburn, AL (United States)
  8. Univ. of California, Irvine, CA (United States)
  9. McMaster Univ., Hamilton, ON (Canada)
  10. Lab. des Sciences du Climat et de l'Environnement, Gif sur Yvette (France)
  11. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  12. National Institute for Environmental Studies, Ibaraki (Japan)
  13. Univ. of Illinois, Urbana, IL (United States)
  14. Tsinghua Univ., Beijing (People's Republic of China)
  15. Carnegie Institution for Science, Stanford, CA (United States)
  16. Univ. of Quebec at Montreal (UQAM), Montreal, QC (Canada)
  17. Montana State Univ., Bozeman, MT (United States)
  18. Univ. of Colorado, Boulder, CO (United States)
  19. National Aeronautics and Space Administration, Mountain View, CA (United States)
  20. Univ. of Maryland, College Park, MD (United States)
  21. Northwest A&F Univ., Yangling (People's Republic of China)
Publication Date:
OSTI Identifier:
1256803
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Environmental Research Letters
Additional Journal Information:
Journal Volume: 10; Journal Issue: 9; Journal ID: ISSN 1748-9326
Publisher:
IOP Publishing
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES evapotransportation; natural and anthropogenic controls; factorial analysis; MsTMIP