edu.ucar.opensky::articles:27391 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T18:10:57.845678 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7st7v3w https://doi.org/10.22033/ESGF/input4MIPs.1125 https Related Dataset #1 CCMI nitrogen surface fluxes in support of CMIP6 - version 2.0 https://doi.org/10.3334/ORNLDAAC/1247 https Related Dataset #2 Regridded Harmonized World Soil Database v1.2 https://doi.org/10.5285/5f331c418e9f4935b8eb1b836f8a91b8 https Related Dataset #3 ESA Biomass Climate Change Initiative (Biomass_cci): Global datasets of forest above-ground biomass for the years 2010, 2017 and 2018, v3 Trends and drivers of terrestrial sources and sinks of carbon dioxide: An overview of the TRENDY project 2024-07-19T00:00:00Z publication https://n2t.org/ark:/85065/d7st7v3w https://doi.org/10.1029/2024GB008102 Sitch, S. author O'Sullivan, M. author Robertson, E. author Friedlingstein, P. author Albergel, C. author Anthoni, P. author Arneth, A. author Arora, V. K. author Bastos, A. author Bastrikov, V. author Bellouin, N. author Canadell, J. G. author Chini, L. author Ciais, P. author Falk, S. author Harris, I. author Hurtt, G. author Ito, A. author Jain, A. K. author Jones, M. W. author Joos, F. author Kato, E. author Kennedy, Daniel author Klein Goldewijk, K. author Kluzek, Erik author Knauer, J. author Lawrence, Peter J. author Lombardozzi, Danica author Melton, J. R. author Nabel, J. E. M. S. author Pan, N. author Peylin, P. author Pongratz, J. author Poulter, B. author Rosan, T. M. author Sun, Q. author Tian, H. author Walker, A. P. author Weber, U. author Yuan, W. author Yue, X. author Zaehle, S. author UCAR/NCAR - Library publisher The terrestrial biosphere plays a major role in the global carbon cycle, and there is a recognized need for regularly updated estimates of land-atmosphere exchange at regional and global scales. An international ensemble of Dynamic Global Vegetation Models (DGVMs), known as the "Trends and drivers of the regional scale terrestrial sources and sinks of carbon dioxide" (TRENDY) project, quantifies land biophysical exchange processes and biogeochemistry cycles in support of the annual Global Carbon Budget assessments and the REgional Carbon Cycle Assessment and Processes, phase 2 project. DGVMs use a common protocol and set of driving data sets. A set of factorial simulations allows attribution of spatio-temporal changes in land surface processes to three primary global change drivers: changes in atmospheric CO2, climate change and variability, and Land Use and Land Cover Changes (LULCC). Here, we describe the TRENDY project, benchmark DGVM performance using remote-sensing and other observational data, and present results for the contemporary period. Simulation results show a large global carbon sink in natural vegetation over 2012-2021, attributed to the CO2 fertilization effect (3.8 +/- 0.8 PgC/yr) and climate (-0.58 +/- 0.54 PgC/yr). Forests and semi-arid ecosystems contribute approximately equally to the mean and trend in the natural land sink, and semi-arid ecosystems continue to dominate interannual variability. The natural sink is offset by net emissions from LULCC (-1.6 +/- 0.5 PgC/yr), with a net land sink of 1.7 +/- 0.6 PgC/yr. Despite the largest gross fluxes being in the tropics, the largest net land-atmosphere exchange is simulated in the extratropical regions. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation