Global Biogeochemical Cycles (GLOBAL BIOGEOCHEM CY)

Publisher: American Geophysical Union, American Geophysical Union

Journal description

Global Biogeochemical Cycles includes papers in the broad areas of global change involving the geosphere and biosphere. Marine, hydrologic, atmospheric, extraterrestrial, geologic, biologic, and human causes of and response to environmental change on timescales of tens, thousands, and millions of years are the purview of the journal.

Current impact factor: 4.53

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 4.528
2012 Impact Factor 4.682
2011 Impact Factor 4.785
2010 Impact Factor 5.263
2009 Impact Factor 4.294
2008 Impact Factor 4.09
2007 Impact Factor 4.335
2006 Impact Factor 3.796
2005 Impact Factor 3.373
2004 Impact Factor 2.864
2003 Impact Factor 3.383
2002 Impact Factor 3.957
2001 Impact Factor 3.292
2000 Impact Factor 3.084
1999 Impact Factor 4.309
1998 Impact Factor 4.204
1997 Impact Factor 3.606
1996 Impact Factor 4.146
1995 Impact Factor 4.898

Impact factor over time

Impact factor
Year

Additional details

5-year impact 5.85
Cited half-life 8.80
Immediacy index 0.75
Eigenfactor 0.02
Article influence 2.66
Website Global Biogeochemical Cycles website
Other titles Global biogeochemical cycles
ISSN 0886-6236
OCLC 12954754
Material type Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publisher details

American Geophysical Union

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Authors' Pre-print on authors' personal website or departmental website
    • Authors' Post-print on authors' personal website or departmental website
    • Set statements to accompany submitted, accepted and published articles
    • Publisher copyright and source must be acknowledged with DOI
    • Publisher's version/PDF must be used in Institutional Repository 6 months after publication.
  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Accounting for carbon fluxes from land use and land cover change (LULCC) generally requires choosing from multiple options of how to attribute the fluxes to regions and to LULCC activities. Applying a newly developed and spatially explicit bookkeeping model BLUE (bookkeeping of land use emissions), we quantify LULCC fluxes and attribute them to land use activities and countries by a range of different accounting methods. We present results with respect to a Kyoto Protocol-like “commitment” accounting period, using land use emissions of 2008–2012 as an example scenario. We assess the effect of accounting methods that vary (1) the temporal evolution of carbon stocks, (2) the state of the carbon stocks at the beginning of the period, (3) the temporal attribution of carbon fluxes during the period, and (4) treatment of LULCC fluxes that occurred prior to the beginning of the period. We show that the methodological choices result in grossly different estimates of carbon fluxes for the different attribution definitions.
    Global Biogeochemical Cycles 08/2015; DOI:10.1002/2014GB004997
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    ABSTRACT: Numerous observations demonstrate that considerable spatial variability exists in components of the marine planktonic ecosystem at the mesoscale and submesoscale (100 km -1 km). The causes and consequences of physical processes at these scales (‘eddy advection’) influencing biogeochemistry have received much attention. Less studied, the non-linear nature of most ecological and biogeochemical interactions means that such spatial variability has consequences for regional estimates of processes including primary production and grazing, independent of the physical processes. This effect has been termed ‘eddy reactions’. Models remain our most powerful tools for extrapolating hypotheses for biogeochemistry to global scales and to permit future projections. The spatial resolution of most climate and global biogeochemical models means that processes at the mesoscale and submesoscale are poorly resolved. Modelling work has previously suggested that the neglected ‘eddy reactions’ may be almost as large as the mean field estimates in some cases. This study seeks to quantify the relative size of eddy and mean reactions observationally, using in situ and satellite data. For primary production, grazing and zooplankton mortality the eddy reactions are between 7% and 15% of the mean reactions. These should be regarded as preliminary estimates to encourage further observational estimates, and not taken as a justification for ignoring eddy reactions. Compared to modelling estimates, there are inconsistencies in the relative magnitude of eddy reactions and in correlations which are a major control on their magnitude. One possibility is that models exhibit much stronger spatial correlations than are found in reality, effectively amplifying the magnitude of eddy reactions.
    Global Biogeochemical Cycles 08/2015; DOI:10.1002/2015GB005129
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    ABSTRACT: Phosphorus (P) plays a strategic role in agricultural production as well as in the occurrence of freshwater and marine eutrophication episodes throughout the world. Moreover, the scarcity and uneven distribution of minable P resources is raising concerns about the sustainability of long-term exploitation. In this paper we analyze the P cycle in anthropic systems with an original multi-scale approach (world region, country, and large basin scales) in two contrasting world regions representative of different trajectories in socioeconomic development for the 1961–2009 period: Europe (EU-27)/France and the Seine River Basin, and Asia (ASEAN-8)/Vietnam and the Red River Basin. Our approach highlights different trends in the agricultural and food production systems of the two regions. Whereas crop production increased until the 1980s in Europe and France and has stabilized thereafter, in ASEAN-8 and Vietnam it began to increase in the 1980s and it is still rising today. These trends are related to the increasing use of fertilizers, although in European countries the amount of fertilizers sharply decreased after the 1980s. On average, the total P delivered from rivers to the sea is three times higher for ASEAN-8 (300 kgP km-2 yr-1) than for EU-27 countries (100 kgP km-2 yr-1) and is twice as high in the Red River (200 kgP km-2 yr-1) than in the Seine River (110 kgP km-2 yr-1), with agricultural losses to water in ASEAN-8 three times higher than in EU-27. Based on the P flux budgets, this study discusses early warnings and management options according to the particularities of the two world regions, newly integrating the perspective of surface water quality with agricultural issues (fertilizers, crop production, and surplus), food/feed exchanges, and diet, defining the so-called water-agro-food system.
    Global Biogeochemical Cycles 07/2015; DOI:10.1002/2015gb005147
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    ABSTRACT: Dissolved organic nitrogen (DON) and phosphorus (DOP) represent the most abundant form of their respective nutrient pool in the surface layer of the oligotrophic oceans and play an important role in nutrient cycling and productivity. Since DOP is generally more labile than DON, it provides additional P that may stimulate growth of N2-fixing diazotrophs that supply fixed nitrogen to balance denitrification in the ocean. In this study, we introduce semi-recalcitrant components of DON and DOP as state variables in an existing global ocean–atmosphere-sea ice-biogeochemistry model of intermediate complexity to assess their impact on the spatial distribution of N2-fixation and the size of the marine fixed nitrogen inventory. Large-scale surface datasets of global DON and Atlantic Ocean DOP are used to constrain the model. Our simulations suggest that both preferential DOP remineralization and phytoplankton DOP uptake are important “non-Redfield” processes (i.e., deviate from molar N:P=16) that need to be accounted for to explain the observed patterns of DOP. Additional non-Redfield DOP sensitivity experiments testing DOM production rate uncertainties that best reproduce the observed spatial patterns of DON and DOP stimulate additional N2-fixation that increases the size of the global marine fixed nitrogen inventory by 4.7±1.7% compared to the simulation assuming Redfield DOM stoichiometry that underestimates the observed nitrogen inventory. The extra 8 Tg yr−1 of N2-fixation stimulated in the Atlantic Ocean is mainly responsible for this increase due to its large spatial separation from water column denitrification, which buffers any potential nitrogen surplus in the Pacific Ocean. Our study suggests that the marine fixed nitrogen budget is sensitive to non-Redfield DOP dynamics because access to the relatively labile DOP pool expands the ecological niche for N2-fixing diazotrophs.
    Global Biogeochemical Cycles 07/2015; 29. DOI:10.1002/2014GB005050
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    ABSTRACT: The rate of change of dissolved oxygen (O2) concentrations was analyzed over 1987–2011 for the high-frequency repeat section along 165°E in the western North Pacific. Significant trends toward decreasing O2 were detected in the northern subtropical to subtropical-subarctic transition zones over a broad range of isopycnal horizons. On 25.3σθ between 25°N and 30°N in North Pacific Subtropical Mode Water, the rate of O2 decrease reached −0.45 ± 0.16 µmol kg−1 yr−1. It is largely attributed to a deepening of isopycnal horizons and to a reduction in oxygen solubility associated with ocean warming. In North Pacific Intermediate Water, the rate of O2 decrease was elevated (−0.44 ± 0.14 µmol kg−1 yr−1 on 26.8σθ) and was associated with net increases in apparent oxygen utilization in the source waters. On 27.3σθ in the subtropical Oxygen Minimum Layer (OML) between 32.5°N and 35°N, the rate of O2 decrease was significant (−0.22 ± 0.05 µmol kg−1 yr−1). It was likely due to the increases in westward transport of low-oxygen water. These various drivers controlling changes in O2 along the 165°E section are the same as those acting along 137°E (analyzed previously) and also account for the differences in the rate of O2 decrease between these sections. Additionally, in the tropical OML near 26.8σθ between 5°N and 10°N, significant trends toward increasing O2 were detected in both sections (+0.36 ± 0.04 µmol kg−1 yr−1 in the 165°E section). These results demonstrate that warming and circulation changes are causing multidecadal changes in dissolved O2 over wide expanses of the western North Pacific.
    Global Biogeochemical Cycles 06/2015; DOI:10.1002/2014GB005065