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: 3.97

Impact Factor Rankings

2015 Impact Factor Available summer 2016
2014 Impact Factor 3.965
2013 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

Additional details

5-year impact 5.37
Cited half-life >10.0
Immediacy index 0.69
Eigenfactor 0.02
Article influence 2.37
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.
    • Publisher last reviewed on 04/08/2015
  • Classification

Publications in this journal

  • Global Biogeochemical Cycles 11/2015; DOI:10.1002/2015GB005187
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    ABSTRACT: Several model studies diagnose the carbon uptake of the North Atlantic as most sensitive to climate change when considered per unit area. Yet the main drivers of the modeled sensitivity and the share of biological production and physical transport are under debate. In order to contribute to this ongoing discussion, two simulations with the Bergen Earth System Model were carried out for period 1850–2099. One of the simulations (COU) includes the radiative effect of rising CO2 (i.e., climate change), while the second simulation (BGC) excludes this effect. The modeled carbon fluxes show substantially different responses to climate change for different parts of the North Atlantic. Based on these differences, we divide the North Atlantic into two regions, namely, the subpolar gyre (SPG) and the rest of the North Atlantic (rNAT*, covering mainly the subtropical gyre). The highest climate sensitivity is found in the SPG region (accounting for an uptake reduction of 8.06 Pg C over the period 1850–2099), while the response of the rNAT* region is moderate (reduction of 4.00 Pg C). We show that the changing CO2 fluxes in both SPG and rNAT* regions are driven by increasing oceanic pCO2. The pCO2 changes in the rNAT* region are caused by both changing physical and biogeochemical processes, while changes in dissolved inorganic carbon (DIC) and alkalinity are the primary contributor to the high climate sensitivity of the SPG region. We identify a reduced biological production to be responsible for the modeled response of DIC and alkalinity, yet the differences between biological contribution and contributions of ocean circulation and CO2 uptake are small, highlighting our need for a better understanding of the marine biological cycle.
    Global Biogeochemical Cycles 10/2015; DOI:10.1002/2015GB005109
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    ABSTRACT: Many pristine humid tropical forests show simultaneously high nitrogen (N) richness and sustained loss of bioavailable N forms. To better understand this apparent up-regulation of the N cycle in tropical forests, process-based understanding of soil N transformations, in geographically diverse locations, remains paramount. Field-based evidence is limited and entirely lacking for humid tropical forests on the African continent. This study aimed at filling both knowledge gaps by monitoring N losses and by conducting an in situ 15N labeling experiment in the Nyungwe tropical montane forest in Rwanda. Here we show that this tropical forest shows high nitrate (NO3?) leaching losses, confirming findings from other parts of the world. Gross N transformation rates point to an open soil N cycle with mineralized N nitrified rather than retained via immobilization; gross immobilization of NH4+ and NO3? combined accounted for 37%of gross mineralization, and plant N uptake is dominated by ammonium (NH4+). This study provided new process understanding of soil N cycling in humid tropical forests and added geographically independent evidence that humid tropical forests are characterized by soil N dynamics and N inputs sustaining bioavailable N loss
    Global Biogeochemical Cycles 10/2015; 29. DOI:10.1002/2015GB005144
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    ABSTRACT: The distribution of dissolved organic carbon (DOC) concentration across coastal waters was characterised based on the compilation of 3510 individual estimates of DOC in coastal waters worldwide. We estimated the DOC concentration in the coastal waters that directly exchange with open ocean waters in two different ways, as the DOC concentration at the edge of the shelf break and as the DOC concentration in coastal waters with salinity close to the average salinity in the open ocean. Using these estimates of DOC concentration in the coastal waters that directly exchange with open ocean waters, the mean DOC concentration in the open ocean and the estimated volume of water annually exchanged between coastal and open ocean, we estimated a median ± SE (and average ± SE) global DOC export from coastal to open ocean waters ranging from 4.4 ± 1.0 Pg C yr−1 to 27.0 ± 1.8 Pg C yr−1 (7.0 ± 5.8 Pg C yr−1 to 29.0 ± 8.0 Pg C yr−1) depending on the global hydrological exchange. These values correspond to a median and mean median (and average) range between 14.7 ± 3.3 to 90.0 ± 3.3 (23.3 ± 19.3 to 96.7± 26.7) Gg C yr−1 per km of shelf break, which is consistent with the range between 1.4 to 66.1 Gg C yr−1 per km of shelf break of available regional estimates of DOC export. The estimated global DOC export from coastal to open ocean waters is also consistent with independent estimates of the net metabolic balance of the coastal ocean. The DOC export from the coastal to the open ocean is likely to be a sizeable flux and is likely to be an important term in the carbon budget of the open ocean, potentially providing an important subsidy to support heterotrophic activity in the open ocean.
    Global Biogeochemical Cycles 09/2015; DOI:10.1002/2014GB005056
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    ABSTRACT: Identifying the anthropogenic and natural sources of mercury (Hg) emissions contributing to atmospheric mercury on local, regional, and global scales continues to be a grand challenge. The relative importance of various direct anthropogenic emissions of mercury, in addition to natural geologic sources and re-emission of previously released and deposited mercury, differs regionally and temporally. In this study, we used local, mesoscale, and synoptic scale meteorological analysis to couple the isotopic composition of ambient atmospheric mercury with potential sources of mercury contributing to a coastal urban-industrial setting near a coal-fired power plant in Pensacola, Florida, USA. We were able to broadly discern four influences on the isotopic composition of ambient atmospheric mercury impacting this coastal urban-industrial region: (1) local to regional urban-industrial anthropogenic emissions (mean δ202Hg = 0.44 ± 0.05‰, 1SD, n = 3); (2) marine-influenced sources derived from the Gulf of Mexico (mean δ202Hg = 0.77 ± 0.15‰, 1SD, n = 4); (3) continental sources associated with north-northwesterly flows from within the planetary boundary layer (mean δ202Hg = 0.65 ± 0.04‰, 1SD, n = 3); and (4) continental sources associated with north-northeasterly flows at higher altitudes (i.e., 2000 m above ground level; mean δ202Hg = 1.10 ± 0.21‰, 1SD, n = 8). Overall, these data, in conjunction with previous studies, suggest that the background global atmospheric mercury pool is characterized by moderately positive δ202Hg values; that urban-industrial emissions drive the isotopic composition of ambient atmospheric mercury toward lower δ202Hg values; and that air-surface exchange dynamics across vegetation and soils of terrestrial ecosystems drive the isotopic composition of ambient atmospheric mercury toward higher positive δ202Hg values. The data further suggest that mass independent fractionation (MIF) of both even-mass- and odd-mass-number isotopes, likely generated by photochemical reactions in the atmosphere or during re-emission from terrestrial and aquatic ecosystems, can be obscured by mixing with anthropogenic emissions having different MIF signatures.
    Global Biogeochemical Cycles 09/2015; DOI:10.1002/2015GB005146