Journal of Geophysical Research: Biogeosciences

  1. Regular Articles

    1. Top of page
    2. Regular Articles
    3. Research Articles
    1. You have free access to this content
      The BETHY/JSBACH Carbon Cycle Data Assimilation System: experiences and challenges (pages 1414–1426)

      T. Kaminski, W. Knorr, G. Schürmann, M. Scholze, P. J. Rayner, S. Zaehle, S. Blessing, W. Dorigo, V. Gayler, R. Giering, N. Gobron, J. P. Grant, M. Heimann, A. Hooker-Stroud, S. Houweling, T. Kato, J. Kattge, D. Kelley, S. Kemp, E. N. Koffi, C. Köstler, P.-P. Mathieu, B. Pinty, C. H. Reick, C. Rödenbeck, R. Schnur, K. Scipal, C. Sebald, T. Stacke, A. Terwisscha van Scheltinga, M. Vossbeck, H. Widmann and T. Ziehn

      Version of Record online: 9 OCT 2013 | DOI: 10.1002/jgrg.20118

      Key Points

      • CCDAS allows us to extend observational information in time and space
      • CCDAS allows us to derive higher-level reanalysis products
      • CCDAS can help to improve the design of the observational network
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      Nonsteady state carbon sequestration in forest ecosystems of China estimated by data assimilation (pages 1369–1384)

      Tao Zhou, Peijun Shi, Gensuo Jia and Yiqi Luo

      Version of Record online: 3 OCT 2013 | DOI: 10.1002/jgrg.20114

      Key Points

      • We used two-step data assimilation to estimate C sink of China's forests
      • Results showed that 27 out of the 32 total parameters could be well constrained
      • The two-step data assimilation is effective for regional C sink estimation
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      Alternative ways of using field-based estimates to calibrate ecosystem models and their implications for carbon cycle studies (pages 983–993)

      Yujie He, Qianlai Zhuang, A. David McGuire, Yaling Liu and Min Chen

      Version of Record online: 1 JUL 2013 | DOI: 10.1002/jgrg.20080

      Key Points

      • Species-, PFT-, and biome-level parameterizations influence modeled C dynamics
      • Biome-level model parameterization may produce biased estimate
      • Improved theoretical basis for species classification in models is needed
  2. Research Articles

    1. Top of page
    2. Regular Articles
    3. Research Articles
    1. A study of the composition, characteristics, and origin of modern driftwood on the western coast of Nunavik (Quebec, Canada) (pages 480–501)

      Stéphanie Steelandt, Dominique Marguerie, Najat Bhiry and Ann Delwaide

      Version of Record online: 24 MAR 2015 | DOI: 10.1002/2014JG002731

      Key Points

      • Eight taxa (four conifers and four hardwoods) were identified in driftwood samples
      • Spruce largely predominate the driftwood accumulations in the coasts of Nunavik
      • Driftwood in the northern village were less numerous, more degraded, and smaller
    2. The sensitivity of wet and dry tropical forests to climate change in Bolivia (pages 399–413)

      C. Seiler, R. W. A. Hutjes, B. Kruijt and T. Hickler

      Version of Record online: 3 MAR 2015 | DOI: 10.1002/2014JG002749

      Key Points

      • Climate change-driven forest loss is more likely in dry forests than in wet forests
      • Forest loss is simulated to be driven by a reduction in plant productivity
      • Main uncertainties are related to projections of annual rainfall
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      Evaluation of the ORCHIDEE ecosystem model over Africa against 25 years of satellite-based water and carbon measurements (pages 1554–1575)

      Abdoul Khadre Traore, Philippe Ciais, Nicolas Vuichard, Benjamin Poulter, Nicolas Viovy, Matthieu Guimberteau, Martin Jung, Ranga Myneni and Joshua B. Fisher

      Version of Record online: 14 AUG 2014 | DOI: 10.1002/2014JG002638

      Key Points

      • High sensitivity of grassland fluxes to climate compared to closed forests
      • CO2 and variable soil depth are small effect on the IAV of GPP and ET
      • Relationship between carbon flux IAV and T2m temperature is weak and negative
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      Effects of land use/land cover and climate changes on terrestrial net primary productivity in the Yangtze River Basin, China, from 2001 to 2010 (pages 1092–1109)

      Yulong Zhang, Conghe Song, Kerong Zhang, Xiaoli Cheng, Lawrence E. Band and Quanfa Zhang

      Version of Record online: 13 JUN 2014 | DOI: 10.1002/2014JG002616

      Key Points

      • LULCC has stronger impacts on NPP than climate change in Yangtze River Basin
      • Forest restoration is an efficient carbon sequestration mechanism
      • NPP models with static LULC could lead to increasingly large errors with time
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      Comprehensive ecosystem model-data synthesis using multiple data sets at two temperate forest free-air CO2 enrichment experiments: Model performance at ambient CO2 concentration (pages 937–964)

      Anthony P. Walker, Paul J. Hanson, Martin G. De Kauwe, Belinda E. Medlyn, Sönke Zaehle, Shinichi Asao, Michael Dietze, Thomas Hickler, Chris Huntingford, Colleen M. Iversen, Atul Jain, Mark Lomas, Yiqi Luo, Heather McCarthy, William J. Parton, I. Colin Prentice, Peter E. Thornton, Shusen Wang, Ying-Ping Wang, David Warlind, Ensheng Weng, Jeffrey M. Warren, F. Ian Woodward, Ram Oren and Richard J. Norby

      Version of Record online: 27 MAY 2014 | DOI: 10.1002/2013JG002553

      Key Points

      • Two temperate forest FACE experiments were simulated with 11 ecosystem models
      • Transpiration biases were often caused by leaf area biases
      • Accuracy was sometimes achieved with compensating biases in component variables
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      Modeling forest dynamics along climate gradients in Bolivia (pages 758–775)

      C. Seiler, R. W. A. Hutjes, B. Kruijt, J. Quispe, S. Añez, V. K. Arora, J. R. Melton, T. Hickler and P. Kabat

      Version of Record online: 6 MAY 2014 | DOI: 10.1002/2013JG002509

      Key Points

      • A realistic transition from evergreen to deciduous tropical forests was modeled
      • Impacts of climate variability on carbon dynamics were assessed
      • Results serve as a basis for climate change impact assessments
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      Evaluation and improvement of a global land model against soil carbon data using a Bayesian Markov chain Monte Carlo method (pages 403–417)

      Oleksandra Hararuk, Jianyang Xia and Yiqi Luo

      Version of Record online: 28 MAR 2014 | DOI: 10.1002/2013JG002535

      Key Points

      • There is great uncertainty associated with carbon cycle simulations
      • This uncertainty is reduced by calibrating models against globally observed data
      • Parameter calibration reduces SOC loss under climate change
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      A quantitative assessment of a terrestrial biosphere model's data needs across North American biomes (pages 286–300)

      Michael C. Dietze, Shawn P. Serbin, Carl Davidson, Ankur R. Desai, Xiaohui Feng, Ryan Kelly, Rob Kooper, David LeBauer, Joshua Mantooth, Kenton McHenry and Dan Wang

      Version of Record online: 19 MAR 2014 | DOI: 10.1002/2013JG002392

      Key Points

      • Drivers of model uncertainty are shared across biomes and functional types
      • Growth respiration, mortality, and stomatal regulation drive uncertainty
      • Accessible informatics tools facilitate model-data synthesis
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      The hysteretic evapotranspiration—Vapor pressure deficit relation (pages 125–140)

      Quan Zhang, Stefano Manzoni, Gabriel Katul, Amilcare Porporato and Dawen Yang

      Version of Record online: 4 FEB 2014 | DOI: 10.1002/2013JG002484

      Key Points

      • Plant water potential, soil water, PAR-VPD lag controls the ET-VPD hysteresis
      • Leaf (or root) potential controls the hysteresis magnitude in a linear manner
      • Soil moisture controls the ET-VPD hysteresis magnitude in a complex way