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Global Biogeochemical Cycles

Cover image for Global Biogeochemical Cycles

June 2011

Volume 25, Issue 2

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      Impacts of atmospheric nutrient deposition on marine productivity: Roles of nitrogen, phosphorus, and iron

      Gregory S. Okin, Alex R. Baker, Ina Tegen, Natalie M. Mahowald, Frank J. Dentener, Robert A. Duce, James N. Galloway, Keith Hunter, Maria Kanakidou, Nilgun Kubilay, Joseph M. Prospero, Manmohan Sarin, Vanisa Surapipith, Mitsuo Uematsu and Tong Zhu

      Article first published online: 23 JUN 2011 | DOI: 10.1029/2010GB003858

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      Key Points

      • N, P, and Fe are deposited to the oceans
      • Fe impacts the N cycle through encouraging N fixation
      • Locally, atmospheric deposition can contribute significantly to ocean C uptake
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      Investigating spatial differentiation of model parameters in a carbon cycle data assimilation system

      T. Ziehn, W. Knorr and M. Scholze

      Article first published online: 18 JUN 2011 | DOI: 10.1029/2010GB003886

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      Key Points

      • Parameter regionalization leads to an improved fit to the observations
      • Large spatial variation in the posterior net CO2 flux on an grid cell level
      • Denser observational network required, in particular in the tropics
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      Age trends in tree ring growth and isotopic archives: A case study of Pinus sylvestris L. from northwestern Norway

      Giles H. F. Young, Joanne C. Demmler, Björn E. Gunnarson, Andreas J. Kirchhefer, Neil J. Loader and Danny McCarroll

      Article first published online: 11 JUN 2011 | DOI: 10.1029/2010GB003913

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      Key Points

      • Tree- ing stable carbon isotopes contain no age-related trends at this location
      • Tree ring stable oxygen isotopes contain no age-related trends at this location
      • Tree ring widths and density contain age-related trends at this location
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      Shallow-depth CaCO3 dissolution: Evidence from excess calcium in the South China Sea and its export to the Pacific Ocean

      Zhimian Cao and Minhan Dai

      Article first published online: 2 JUN 2011 | DOI: 10.1029/2009GB003690

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      Key Points

      • Excess Ca2+ was observed in the SCS subsurface water relative to the WPS
      • Excess Ca2+ indicated shallow-depth CaCO3 dissolution in the SCS interior
      • Excess Ca2+ could be exported to the Pacific through subsurface water outflow
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      Attributing uncertainties in simulated biospheric carbon fluxes to different error sources

      J. C. Lin, M. R. Pejam, E. Chan, S. C. Wofsy, E. W. Gottlieb, H. A. Margolis and J. H. McCaughey

      Article first published online: 1 JUN 2011 | DOI: 10.1029/2010GB003884

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      Key Points

      • Introduces a general framework for analyzing errors in biospheric carbon models
      • Largest errors result from erroneous biospheric parameters
      • Solar radiation caused nonnegligible biases in annual simulated carbon fluxes
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      Anthropogenic nitrogen emissions during the Holocene and their possible effects on remote ecosystems

      Jiří Kopáček and Maximilian Posch

      Article first published online: 25 MAY 2011 | DOI: 10.1029/2010GB003779

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      Key Points

      • Global cumulative anthropogenic emission of N has been 17.4 Pg N since 8000 BC
      • About 72% of total anthropogenic N emission occurred in the preindustrial era
      • Anthropogenic N emission could affect remote ecosystems prior to industrial era
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      Quantifying spatial and temporal Holocene carbon accumulation in ombrotrophic peatlands of the Eastmain region, Quebec, Canada

      Simon van Bellen, Pierre-Luc Dallaire, Michelle Garneau and Yves Bergeron

      Article first published online: 25 MAY 2011 | DOI: 10.1029/2010GB003877

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      Key Points

      • Eastmain peatlands have sequestered carbon at a Holocene rate of 16.2 g m−2 yr−1
      • Carbon accumulation rates have decreased toward the late Holocene
      • Peatland expansion is an important factor in peatland carbon sequestration
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      Plant diversity effects on aboveground and belowground N pools in temperate grassland ecosystems: Development in the first 5 years after establishment

      Yvonne Oelmann, Nina Buchmann, Gerd Gleixner, Maike Habekost, Christiane Roscher, Stephan Rosenkranz, Ernst-Detlef Schulze, Sibylle Steinbeiss, Vicky M. Temperton, Alexandra Weigelt, Wolfgang W. Weisser and Wolfgang Wilcke

      Article first published online: 25 MAY 2011 | DOI: 10.1029/2010GB003869

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      Key Points

      • The plant diversity-N cycle relationship changes with time in grasslands
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      The pCO2 in boreal lakes: Organic carbon as a universal predictor?

      Søren Larsen, Tom Andersen and Dag O. Hessen

      Article first published online: 24 MAY 2011 | DOI: 10.1029/2010GB003864

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      Key Points

      • The pCO2 in lakes primarily stems from microbial mineralization of allochthonous DOC
      • Identity link gamma-GLM models are appropriate for predicting pCO2 in lakes
      • Reported regional differences in the DOC:pCO2 correlation could be an artifact
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      Fluxes of particulate iron from the upper ocean around the Crozet Islands: A naturally iron-fertilized environment in the Southern Ocean

      Hélène Planquette, Richard R. Sanders, Peter J. Statham, Paul J. Morris and Gary R. Fones

      Article first published online: 24 MAY 2011 | DOI: 10.1029/2010GB003789

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      Fossil and contemporary aerosol particulate organic carbon in the eastern United States: Implications for deposition and inputs to watersheds

      Andrew S. Wozniak, James E. Bauer and Rebecca M. Dickhut

      Article first published online: 24 MAY 2011 | DOI: 10.1029/2010GB003855

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      Key Points

      • Aerosol particulate TOC is quantitatively important to watershed OC budgets
      • Fossil-derived OC represents one-third of atmospheric particulate OC
      • Watershed-scale particulate OC deposition is similar in size to river OC export
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      Influence of chemical weathering and aging of iron oxides on the potential iron solubility of Saharan dust during simulated atmospheric processing

      Zongbo Shi, Michael D. Krom, Steeve Bonneville, Alex R. Baker, Charlie Bristow, Nick Drake, Graham Mann, Ken Carslaw, James B. McQuaid, Tim Jickells and Liane G. Benning

      Article first published online: 21 MAY 2011 | DOI: 10.1029/2010GB003837

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      Mechanisms controlling export production at the LGM: Effects of changes in oceanic physical fields and atmospheric dust deposition

      Akira Oka, Ayako Abe-Ouchi, Megumi O. Chikamoto and Tomoyuki Ide

      Article first published online: 21 MAY 2011 | DOI: 10.1029/2009GB003628

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      Key Points

      • Simulation of nutrient, iron, and carbon cycles in the ocean at the LGM
      • Comparison of simulated export production with a paleoreconstruction
      • Evaluation of sea ice and dust input in export production at the LGM
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      Characterization and production and consumption processes of N2O emitted from temperate agricultural soils determined via isotopomer ratio analysis

      Sakae Toyoda, Midori Yano, Sei-ichi Nishimura, Hiroko Akiyama, Atsushi Hayakawa, Keisuke Koba, Shigeto Sudo, Kazuyuki Yagi, Akiko Makabe, Yoshifumi Tobari, Nanako O. Ogawa, Naohiko Ohkouchi, Keita Yamada and Naohiro Yoshida

      Article first published online: 21 MAY 2011 | DOI: 10.1029/2009GB003769

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      Inventories and behavior of particulate organic carbon in the Laptev and East Siberian seas

      Laura Sánchez-García, Vanja Alling, Svetlana Pugach, Jorien Vonk, Bart van Dongen, Christoph Humborg, Oleg Dudarev, Igor Semiletov and Örjan Gustafsson

      Article first published online: 21 MAY 2011 | DOI: 10.1029/2010GB003862

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      Key Points

      • Strong influence of terr-OC in the Laptev and W-East Siberian seas waters
      • Quantitative constraint of the POC inventory in the Laptev and East Siberian seas
      • Strong nonconservative behavior of POC (mainly degradation and sedimentation)
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      Simulating the effects of climate and agricultural management practices on global crop yield

      D. Deryng, W. J. Sacks, C. C. Barford and N. Ramankutty

      Article first published online: 20 MAY 2011 | DOI: 10.1029/2009GB003765

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      Key Points

      • A global crop yield model for maize, soybean, and spring wheat is presented
      • Agricultural management practices play an important role on crop yield
      • Adapting planting dates and crop cultivars mitigate the impact of climate change
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      The emergence of ocean biogeochemical provinces: A quantitative assessment and a diagnostic for model evaluation

      Marcello Vichi, J. Icarus Allen, Simona Masina and Nicholas J. Hardman-Mountford

      Article first published online: 17 MAY 2011 | DOI: 10.1029/2010GB003867

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      Key Points

      • Ocean biogeographic provinces can be identified in multivariate global data
      • The PELAGOS ocean biogeochemical model can simulate a similar province layout
      • Model validation carried out using biogeochemical province is promising
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      Effects of soil spatial resolution on quantifying CH4 and N2O emissions from rice fields in the Tai Lake region of China by DNDC model

      D. S. Yu, H. Yang, X. Z. Shi, E. D. Warner, L. M. Zhang and Q. G. Zhao

      Article first published online: 13 MAY 2011 | DOI: 10.1029/2010GB003825

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      Key Points

      • effects of soil spatial resolution on modeling
      • soil carbon and nitrogen cycle
      • DNDC model
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      Biogeographical controls on the marine nitrogen fixers

      F. M. Monteiro, S. Dutkiewicz and M. J. Follows

      Article first published online: 21 APR 2011 | DOI: 10.1029/2010GB003902

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      Key Points

      • Diazotroph global habitat is not directly controlled by temperature and light
      • It is restricted to the ocean regions with low N and sufficient Fe
      • We interpret diazotroph regulation by Fe using resource competition theory
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      Strong atmospheric chemistry feedback to climate warming from Arctic methane emissions

      Ivar S. A. Isaksen, Michael Gauss, Gunnar Myhre, Katey M. Walter Anthony and Carolyn Ruppel

      Article first published online: 20 APR 2011 | DOI: 10.1029/2010GB003845

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      Key Points

      • The importance of atmospheric chemistry in response to permafrost emissions
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      Stocks and fluxes of carbon associated with land use change in Southeast Asian tropical peatlands: A review

      Kristell Hergoualc'h and Louis V. Verchot

      Article first published online: 14 APR 2011 | DOI: 10.1029/2009GB003718

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      Key Points

      • Only the heterotrophic soil respiration is involved in peat C loss
      • Peat C loss contributes more than 63% to total C loss from land use conversion
      • Combination of the stock and flux approaches for assessing C loss from peatlands

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