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Journal of Geophysical Research: Biogeosciences (2005–2012)

Cover image for Journal of Geophysical Research: Biogeosciences (2005–2012)

December 2011

Volume 116, Issue G4

Currently known as: Journal of Geophysical Research: Biogeosciences

    1. You have free access to this content
      Labile dissolved organic carbon supply limits hyporheic denitrification

      Jay P. Zarnetske, Roy Haggerty, Steven M. Wondzell and Michelle A. Baker

      Version of Record online: 31 DEC 2011 | DOI: 10.1029/2011JG001730

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      Key Points

      • The hyporheic zone can retain and remove dissolved organic carbon and nitrate
      • Conservative and stable isotope (15N) tracers show coupled C and N dynamics
      • Dissolved organic carbon quality and quantity limit hyporheic denitrification
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      Leaf conductance and carbon gain under salt-stressed conditions

      V. Volpe, S. Manzoni, M. Marani and G. Katul

      Version of Record online: 29 DEC 2011 | DOI: 10.1029/2011JG001848

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      Key Points

      • Dependence of photosynthetic and water cost parameters on salinity
      • Importance of the effect of the mesophyll conductance in saline conditions
      • Compound effects of salinity and elevated ambient CO2 concentration conditions
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      Iron reduction and magnetite biomineralization mediated by a deep-sea iron-reducing bacteriumShewanella piezotolerans WP3

      Wenfang Wu, Bi Li, Jing Hu, Jinhua Li, Fengping Wang and Yongxin Pan

      Version of Record online: 28 DEC 2011 | DOI: 10.1029/2011JG001728

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      Key Points

      • Deep-sea psychrotolerant and piezotolorant WP3 quickly reduce ferrihydrite
      • DIR of WP3 produces small (<10 nm) but well-crystallined SP magnetite
      • Multiproxy magnetic method can effectively monitor the biomineralization process
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      Simulating coupled carbon and nitrogen dynamics following mountain pine beetle outbreaks in the western United States

      Steven L. Edburg, Jeffrey A. Hicke, David M. Lawrence and Peter E. Thornton

      Version of Record online: 23 DEC 2011 | DOI: 10.1029/2011JG001786

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      Key Points

      • Bark beetle-caused tree mortality alters carbon and nitrogen cycling in forests
      • Variations in outbreak conditions are important for postoutbreak carbon cycling
      • The fate of killed trees is an important variable in postoutbreak carbon cycles
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      Potential influence of sea cucumbers on coral reef CaCO3 budget: A case study at One Tree Reef

      Kenneth Schneider, Jacob Silverman, Erika Woolsey, Hampus Eriksson, Maria Byrne and Ken Caldeira

      Version of Record online: 23 DEC 2011 | DOI: 10.1029/2011JG001755

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      Key Points

      • Sea cucumbers are important to the CaCO3 budget of a coral reef
      • Alkalinity added by bioeroder can partially buffer ocean acidification effects
      • Bioeroder alkalinity addition is by CaCO3 dissolution and nutrients addition
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      How well do stomatal conductance models perform on closing plant carbon budgets? A test using seedlings grown under current and elevated air temperatures

      Danielle A. Way, Ram Oren, Hyun-Seok Kim and Gabriel G. Katul

      Version of Record online: 22 DEC 2011 | DOI: 10.1029/2011JG001808

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      Key Points

      • We compared six stomatal models with vegetation grown under future climates
      • Models were judged on seasonal carbon budget closure
      • The Leuning model and an optimization approach performed best
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      Biogeochemistry of nitrous oxide in Lake Kizaki, Japan, elucidated by nitrous oxide isotopomer analysis

      Y. Sasaki, K. Koba, M. Yamamoto, A. Makabe, Y. Ueno, M. Nakagawa, S. Toyoda, N. Yoshida and M. Yoh

      Version of Record online: 21 DEC 2011 | DOI: 10.1029/2010JG001589

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      Key Points

      • N2O isotopomer was applied to elucidate N2O biogeochemistry in freshwater lake
      • N2O site preference suggested nitrification as the source of N2O in oxic water
      • Denitrification with N2O reduction was the source of N2O in deep water
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      Characterizing the performance of ecosystem models across time scales: A spectral analysis of the North American Carbon Program site-level synthesis

      Michael C. Dietze, Rodrigo Vargas, Andrew D. Richardson, Paul C. Stoy, Alan G. Barr, Ryan S. Anderson, M. Altaf Arain, Ian T. Baker, T. Andrew Black, Jing M. Chen, Philippe Ciais, Lawrence B. Flanagan, Christopher M. Gough, Robert F. Grant, David Hollinger, R. Cesar Izaurralde, Christopher J. Kucharik, Peter Lafleur, Shugang Liu, Erandathie Lokupitiya, Yiqi Luo, J. William Munger, Changhui Peng, Benjamin Poulter, David T. Price, Daniel M. Ricciuto, William J. Riley, Alok Kumar Sahoo, Kevin Schaefer, Andrew E. Suyker, Hanqin Tian, Christina Tonitto, Hans Verbeeck, Shashi B. Verma, Weifeng Wang and Ensheng Weng

      Version of Record online: 20 DEC 2011 | DOI: 10.1029/2011JG001661

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      Key Points

      • Twenty-one ecosystem models were tested in the frequency domain at nine flux towers
      • Model error is greatest at the annual and growing-season diurnal timescales
      • There are large event-driven errors and model differences at the synoptic scale
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      Diffusive and ebullitive transport of methane and nitrous oxide from streams: Are bubble-mediated fluxes important?

      Helen M. Baulch, Peter J. Dillon, Roxane Maranger and Sherry L. Schiff

      Version of Record online: 15 DEC 2011 | DOI: 10.1029/2011JG001656

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      Key Points

      • Ebullition is an important mode of methane emissions from streams
      • Bubble gas concentrations and emissions are related to sediment characteristics
      • Methane emissions significantly exceed nitrous oxide emissions in terms of GWP
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      Seasonal variation of photosynthetic model parameters and leaf area index from global Fluxnet eddy covariance data

      M. Groenendijk, A. J. Dolman, C. Ammann, A. Arneth, A. Cescatti, D. Dragoni, J. H. C. Gash, D. Gianelle, B. Gioli, G. Kiely, A. Knohl, B. E. Law, M. Lund, B. Marcolla, M. K. van der Molen, L. Montagnani, E. Moors, A. D. Richardson, O. Roupsard, H. Verbeeck and G. Wohlfahrt

      Version of Record online: 15 DEC 2011 | DOI: 10.1029/2011JG001742

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      Key Points

      • We present an analysis of the ecosystem photosynthetic parameter variation
      • The seasonal parameters are only partly explained by LAI
      • Key meteorological constraints are derived, which are useful as addition to PFTs
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      Potential changes in larval dispersal and alongshore connectivity on the central Chilean coast due to an altered wind climate

      C. M. Aiken, S. A. Navarrete and J. L. Pelegrí

      Version of Record online: 10 DEC 2011 | DOI: 10.1029/2011JG001731

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      Key Points

      • Intensification of the upwelling circulation in central Chile
      • Recruitment of passive larvae may decrease as a result
      • However, recruitment of larvae with vertical swimming ability may increase
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      Carbon isotopic composition, methanogenic pathway, and fraction of CH4oxidized in a rice field flooded year-round

      Guangbin Zhang, Xiaoyan Zhang, Yang Ji, Jing Ma, Hua Xu and Zucong Cai

      Version of Record online: 8 DEC 2011 | DOI: 10.1029/2011JG001696

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      Key Points

      • Floodwater CH4 was heavier in delta 13C value than pore water CH4
      • Emitted CH4 was heavier in the fallow season than in the rice season
      • Low acetoclastic methanogenesis and high CH4 oxidation was observed
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      Twentieth century erosion in Arctic Alaska foothills: The influence of shrubs, runoff, and permafrost

      Ken D. Tape, David Verbyla and Jeffrey M. Welker

      Version of Record online: 30 NOV 2011 | DOI: 10.1029/2011JG001795

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      Key Points

      • Tall shrubs occupy drainages and are expanding along these corridors
      • Erosion has declined contemporaneously with the recent shrub expansion
      • Growing season has lengthened, as evident from earlier peak river discharges
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      Climate change threatens endangered plant species by stronger and interacting water-related stresses

      Ruud P. Bartholomeus, Jan-Philip M. Witte, Peter M. van Bodegom, Jos C. van Dam and Rien Aerts

      Version of Record online: 30 NOV 2011 | DOI: 10.1029/2011JG001693

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      Key Points

      • Process-based approach needed to predict climate change impact on plant species
      • Climate change increases both wet and dry extremes of plant stresses
      • Coincidence of stresses threatens future of currently endangered plant species
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      A 200 year temperature record from tree ring δ13C at the Qaidam Basin of the Tibetan Plateau after identifying the optimum method to correct for changing atmospheric CO2 and δ13C

      Wenzhi Wang, Xiaohong Liu, Xuemei Shao, Steven Leavitt, Guobao Xu, Wenling An and Dahe Qin

      Version of Record online: 29 NOV 2011 | DOI: 10.1029/2011JG001665

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      Key Points

      • Tree ring 13C
      • Temperature reconstruction
      • Qaidam Basin
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      Lakes as buffers of stream dissolved organic matter (DOM) variability: Temporal patterns of DOM characteristics in mountain stream-lake systems

      Keli J. Goodman, Michelle A. Baker and Wayne A. Wurtsbaugh

      Version of Record online: 29 NOV 2011 | DOI: 10.1029/2011JG001709

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      Key Points

      • Lakes buffer subapline stream DOM temporal variability
      • Role of lakes on DOM dynamic switches across seasons
      • Subalpine lakes act as a DOM sink during spring and a DOM source during summer
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      Mapping forest canopy height globally with spaceborne lidar

      Marc Simard, Naiara Pinto, Joshua B. Fisher and Alessandro Baccini

      Version of Record online: 19 NOV 2011 | DOI: 10.1029/2011JG001708

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      Key Points

      • Produced global map of canopy height using ICESat
      • Validated map using canopy height at fluxnet sites
      • Developed an ICESat waveform selection method
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      Consistently modeling the combined effects of temperature and concentration on nitrate uptake in the ocean

      S. Lan Smith

      Version of Record online: 16 NOV 2011 | DOI: 10.1029/2011JG001681

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      Key Points

      • Better model of temperature and concentration effects on oceanic nitrate uptake
      • Models should consider greater temperature sensitivity for phytoplankton
      • Physiological trade-off implies higher temperature sensitivity of phytoplankton
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      In search of experimental evidence for the biogeobattery

      Christopher G. Hubbard, L. Jared West, Katherine Morris, Bernd Kulessa, Diana Brookshaw, Jonathan R. Lloyd and Samuel Shaw

      Version of Record online: 15 NOV 2011 | DOI: 10.1029/2011JG001713

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      Key Points

      • Microbially induced redox gradients do not necessarily yield SP signals
      • Careful electrode design required in biogeophysics experiments
      • Very specific conditions required for biogeobattery, rare in nature
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      The potential of carbonyl sulfide as a proxy for gross primary production at flux tower sites

      J. M. Blonquist Jr., S. A. Montzka, J. W. Munger, D. Yakir, A. R. Desai, D. Dragoni, T. J. Griffis, R. K. Monson, R. L. Scott and D. R. Bowling

      Version of Record online: 15 NOV 2011 | DOI: 10.1029/2011JG001723

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      Key Points

      • Measured OCS and CO2 vertical gradients were highly correlated
      • GPP estimated from OCS was similar to GPP derived from established techniques
      • Sites with short canopies have much larger potential OCS gradients
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      A process-based inventory model for landfill CH4 emissions inclusive of seasonal soil microclimate and CH4 oxidation

      K. Spokas, J. Bogner and J. Chanton

      Version of Record online: 11 NOV 2011 | DOI: 10.1029/2011JG001741

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      Key Points

      • Incorporation of soil microclimate into landfill emission inventory models
      • Methanotrophic oxidation is climate and soil type specific
      • Decoupling of methane generation from landfill greenhouse gas inventories
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      Simulating the impacts of disturbances on forest carbon cycling in North America: Processes, data, models, and challenges

      Shuguang Liu, Ben Bond-Lamberty, Jeffrey A. Hicke, Rodrigo Vargas, Shuqing Zhao, Jing Chen, Steven L. Edburg, Yueming Hu, Jinxun Liu, A. David McGuire, Jingfeng Xiao, Robert Keane, Wenping Yuan, Jianwu Tang, Yiqi Luo, Christopher Potter and Jennifer Oeding

      Version of Record online: 8 NOV 2011 | DOI: 10.1029/2010JG001585

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      Key Points

      • Disturbances have significant impacts on carbon cycling
      • Modeling disturbances and their impacts on carbon is essential
      • Reviewed the status of data, processes, modeling, and challenges
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      Disturbance and the resilience of coupled carbon and nitrogen cycling in a north temperate forest

      L. E. Nave, C. M. Gough, K. D. Maurer, G. Bohrer, B. S. Hardiman, J. Le Moine, A. B. Munoz, K. J. Nadelhoffer, J. P. Sparks, B. D. Strahm, C. S. Vogel and P. S. Curtis

      Version of Record online: 29 OCT 2011 | DOI: 10.1029/2011JG001758

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      Key Points

      • Subtle disturbances have subtle yet significant effects on CN cycling
      • Short-term responses to disturbance can set long-term CN cycling trajectories
      • Subtle and severe disturbances have different short- and long-term effects on CN
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      Nitrate dynamics in the soil and unconfined aquifer in arid groundwater coupled ecosystems of the Monte desert, Argentina

      J. N. Aranibar, P. E. Villagra, M. L. Gomez, E. Jobbágy, M. Quiroga, R. G. Wuilloud, R. P. Monasterio and A. Guevara

      Version of Record online: 27 OCT 2011 | DOI: 10.1029/2010JG001618

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      Key Points

      • Vegetation and topographic position affect soil nitrate distribution and content
      • Part of the soil nitrate escapes root uptake and is leached to the subsoil
      • Nitrate leaching to the aquifer is not widespread
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      Atmospheric pressure drives changes in the vertical distribution of biogenic free-phase gas in a northern peatland

      Xavier Comas, Lee Slater and A. S. Reeve

      Version of Record online: 26 OCT 2011 | DOI: 10.1029/2011JG001701

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      Key Points

      • Gas content in deep peat soils is larger and less variable than shallow peat
      • Increases in atmospheric pressure result in gas release from shallow peat
      • Decreases in atmospheric pressure result in upward gas movement
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      Longer growing seasons do not increase net carbon uptake in the northeastern Siberian tundra

      F. J. W. Parmentier, M. K. van der Molen, J. van Huissteden, S. A. Karsanaev, A. V. Kononov, D. A. Suzdalov, T. C. Maximov and A. J. Dolman

      Version of Record online: 25 OCT 2011 | DOI: 10.1029/2011JG001653

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      Key Points

      • Longer growing seasons do not increase net carbon uptake
      • Highest uptake occurs in cold or short growing seasons
      • Greenhouse gas function of this tundra ecosystem is likely to diminish
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      Water balance model for mean annual hydrogen and oxygen isotope distributions in surface waters of the contiguous United States

      Gabriel J. Bowen, Casey D. Kennedy, Zhongfang Liu and Jeremy Stalker

      Version of Record online: 22 OCT 2011 | DOI: 10.1029/2010JG001581

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      Key Points

      • Found that 90% of river isotope variation results from precipitation isotope variation
      • River isotope values are predictable in support of ecology and forensics studies
      • Simple models can isolate secondary climate signals from river isotope data
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      Carbon uptake by karsts in the Houzhai Basin, southwest China

      Junhua Yan, Y. P. Wang, Guoyi Zhou, Shenggong Li, Guirui Yu and Kun Li

      Version of Record online: 22 OCT 2011 | DOI: 10.1029/2011JG001686

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      Key Points

      • Carbon uptake in the wet season was found to be 2.4 times that in the dry season
      • Carbon uptake can be biased by >25% if no seasonal variations accounted for
      • Karsts in China together take up about 12 Tg C year-1
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      Seasonal pattern of regional carbon balance in the central Rocky Mountains from surface and airborne measurements

      Ankur R. Desai, David J. P. Moore, William K. M. Ahue, Phillip T. V. Wilkes, Stephan F. J. De Wekker, Bjorn G. Brooks, Teresa L. Campos, Britton B. Stephens, Russell K. Monson, Sean P. Burns, Tristan Quaife, Steven M. Aulenbach and David S. Schimel

      Version of Record online: 22 OCT 2011 | DOI: 10.1029/2011JG001655

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      Key Points

      • Regional carbon fluxes in mountain regions are poorly observed
      • Airborne budgets and ecosystem models can be used to place bounds on uncertainty
      • Dual carbon uptake pattern is consistent across region and related to snowmelt
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      Modeling the effects of hydrology on gross primary productivity and net ecosystem productivity at Mer Bleue bog

      Dimitre D. Dimitrov, Robert F. Grant, Peter M. Lafleur and Elyn R. Humphreys

      Version of Record online: 22 OCT 2011 | DOI: 10.1029/2010JG001586

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      Key Points

      • Peatland subsurface hydrology
      • Vascular and moss plant water relations
      • Vascular, moss, and ecosystem productivity
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      Drought sensitivity of patterned vegetation determined by rainfall-land surface feedbacks

      Alexandra G. Konings, Stefan C. Dekker, Max Rietkerk and Gabriel G. Katul

      Version of Record online: 21 OCT 2011 | DOI: 10.1029/2011JG001748

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      Key Points

      • Vegetation pattern morphology change due to drought requires at least 4 years
      • Positive feedbacks between vegetation and the atmosphere accelerate this change
      • Negative feedback days may occur depending on free atmospheric conditions
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      Persistent wind-induced enhancement of diffusive CO2 transport in a mountain forest snowpack

      D. R. Bowling and W. J. Massman

      Version of Record online: 20 OCT 2011 | DOI: 10.1029/2011JG001722

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      Key Points

      • Pressure pumping causes ventilation of trace gases from a seasonal snowpack
      • Pressure pumping enhances trace gas transport beyond the rate of molecular diffusion
      • Enhanced transport is 40% higher in the short term but 8%–11% higher over a winter
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      Seasonal and spatial variability of CO2 emission from a large floodplain lake in the lower Amazon

      Conrado M. Rudorff, John M. Melack, Sally MacIntyre, Cláudio C. F. Barbosa and Evlyn M. L. M. Novo

      Version of Record online: 20 OCT 2011 | DOI: 10.1029/2011JG001699

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      Key Points

      • Large Amazon lakes have high spatial variability in CO2 concentration
      • Seasonal changes in mixing patterns affect biogenic gas production and emission
      • Current regional calculations underestimate CO2 evasion from large Amazon lakes
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      Seasonal variations in the nitrogen isotope composition of Okinotori coral in the tropical western Pacific: A new proxy for marine nitrate dynamics

      Atsuko Yamazaki, Tsuyoshi Watanabe, Nanako O. Ogawa, Naohiko Ohkouchi, Kotaro Shirai, Mitsuhiro Toratani and Mitsuo Uematsu

      Version of Record online: 14 OCT 2011 | DOI: 10.1029/2011JG001697

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      Key Points

      • We present seasonal variations of coral δ15N in the tropical western Pacific
      • Coral δ15N recorded nitrate supply from deeper layer and nitrogen fixation
      • Coral δ15N could be direct proxy for nitrate dynamics in tropical area
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      Ebullition events monitored from northern peatlands using electrical imaging

      Nicholas Kettridge, Andrew Binley, Sophie M. Green and Andy J. Baird

      Version of Record online: 7 OCT 2011 | DOI: 10.1029/2010JG001561

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      Key Points

      • Shows the potential of electrical imaging to monitor gas dynamics
      • Shows that larger ebullition events are spatially diffuse in terms of their origin
      • Describes peat temperature and structure control ebuilltion dynamics
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      Quantifying burned area for North American forests: Implications for direct reduction of carbon stocks

      Eric S. Kasischke, Tatiana Loboda, Louis Giglio, Nancy H. F. French, E. E. Hoy, Bernardus de Jong and David Riano

      Version of Record online: 4 OCT 2011 | DOI: 10.1029/2011JG001707

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      Key Points

      • A variety of different burned area products exist for North America
      • Land manage records provide the best source of long term data
      • Considerable uncertainties exist for historical burned area estimates
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      Influences of the hydrological cycle on observed interannual variations in atmospheric CO18O

      Nikolaus H. Buenning, David C. Noone, William J. Riley, Christopher J. Still and James W. C. White

      Version of Record online: 1 OCT 2011 | DOI: 10.1029/2010JG001576

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      Key Points

      • Interannual δCa variations were driven by isotope hydrology and RH
      • No evidence of carbon flux anomalies driving interannual δCa variations was found
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      A new approach for estimating northern peatland gross primary productivity using a satellite-sensor-derived chlorophyll index

      A. Harris and J. Dash

      Version of Record online: 1 OCT 2011 | DOI: 10.1029/2011JG001662

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      Key Points

      • First to use MERIS data to estimate peatland GPP
      • First to demonstrate the role of chlorophyll in peatland GPP estimation
      • VI Models show promise for quantifying spatial and temporal peatland GPP dynamics
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      Woody plant proliferation in North American drylands: A synthesis of impacts on ecosystem carbon balance

      Nichole N. Barger, Steven R. Archer, John L. Campbell, Cho-ying Huang, Jeffery A. Morton and Alan K. Knapp

      Version of Record online: 10 AUG 2011 | DOI: 10.1029/2010JG001506

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      Key Points

      • ANPP changes with woody encroachment are positively related to MAP
      • Woody encroachment results in net ecosystem C gain across most species and ecoregions
      • Disturbance may significantly offset woody encroachment C gains
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      Vulnerability of high-latitude soil organic carbon in North America to disturbance

      Guido Grosse, Jennifer Harden, Merritt Turetsky, A. David McGuire, Philip Camill, Charles Tarnocai, Steve Frolking, Edward A. G. Schuur, Torre Jorgenson, Sergei Marchenko, Vladimir Romanovsky, Kimberly P. Wickland, Nancy French, Mark Waldrop, Laura Bourgeau-Chavez and Robert G. Striegl

      Version of Record online: 28 JUL 2011 | DOI: 10.1029/2010JG001507

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      Key Points

      • SOC in northern high latitudes is highly vulnerable to disturbances
      • Disturbances are an important component of the northern soil C cycle
      • Soils in northern high latitudes could loose their long-term C sink character
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      Microtopographic controls on ecosystem functioning in the Arctic Coastal Plain

      D. Zona, D. A. Lipson, R. C. Zulueta, S. F. Oberbauer and W. C. Oechel

      Version of Record online: 27 JUL 2011 | DOI: 10.1029/2009JG001241

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      Key Points

      • Microtopographic gradient led to pattern in pH, EC, ORP, and dissolved CO2
      • Microtopography controls lateral flow of organic matter and litter accumulation
      • Low-centers polygons have highest pH, ER, and dissolved CO2
    42. You have free access to this content
      Model comparisons for estimating carbon emissions from North American wildland fire

      Nancy H. F. French, William J. de Groot, Liza K. Jenkins, Brendan M. Rogers, Ernesto Alvarado, Brian Amiro, Bernardus de Jong, Scott Goetz, Elizabeth Hoy, Edward Hyer, Robert Keane, B. E. Law, Donald McKenzie, Steven G. McNulty, Roger Ottmar, Diego R. Pérez-Salicrup, James Randerson, Kevin M. Robertson and Merritt Turetsky

      Version of Record online: 25 MAY 2011 | DOI: 10.1029/2010JG001469

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      Key Points

      • To compare six models of fire emissions and present and discuss results
      • To present the differences between various fire emissions models
      • To recommend further data sets needed to improve fire emissions modeling
    43. You have free access to this content
      Heterotrophic respiration in disturbed forests: A review with examples from North America

      Mark E. Harmon, Ben Bond-Lamberty, Jianwu Tang and Rodrigo Vargas

      Version of Record online: 14 MAY 2011 | DOI: 10.1029/2010JG001495

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      Key Points

      • Sources of RH are diverse with very uneven levels of understanding
      • Disturbance is a major control of RH and carbon balances
      • Interactive effects of disturbance legacies and climate on RH need examination
    44. You have free access to this content
      Recent rates of forest harvest and conversion in North America

      Jeffrey G. Masek, Warren B. Cohen, Donald Leckie, Michael A. Wulder, Rodrigo Vargas, Ben de Jong, Sean Healey, Beverly Law, Richard Birdsey, R. A. Houghton, David Mildrexler, Samuel Goward and W. Brad Smith

      Version of Record online: 15 APR 2011 | DOI: 10.1029/2010JG001471

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    45. You have free access to this content

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