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: The attenuation of sinking particle fluxes through the mesopelagic zone is an important process that controls the sequestration of carbon and the distribution of other elements throughout the oceans. Case studies at two contrasting sites, the oligotrophic regime of the Bermuda Atlantic Time-series Study (BATS) and the mesotrophic waters of the west Antarctic Peninsula (WAP) sector of the Southern Ocean, revealed large differences in the rates of particle-attached microbial respiration and the average sinking velocities of marine particles, two parameters that affect the transfer efficiency of particulate matter from the base of the euphotic zone into the deep ocean. Rapid average sinking velocities of 270 ± 150 m d−1 were observed along the WAP, whereas the average velocity was 49 ± 25 m d−1 at the BATS site. Respiration rates of particle-attached microbes were measured using novel RESPIRE (REspiration of Sinking Particles In the subsuRface ocEan) sediment traps that first intercepts sinking particles then incubates them in situ. RESPIRE experiments yielded flux-normalized respiration rates of 0.4 ± 0.1 day−1 at BATS when excluding an outlier of 1.52 day−1, while these rates were undetectable along the WAP (0.01 ± 0.02 day−1). At BATS, flux-normalized respiration rates decreased exponentially with respect to depth below the euphotic zone with a 75% reduction between the 150 and 500 m depths. These findings provide quantitative and mechanistic insights into the processes that control the transfer efficiency of particle flux through the mesopelagic and its variability throughout the global oceans.
    Global Biogeochemical Cycles 02/2015; DOI:10.1002/2014GB004935
  • [Show abstract] [Hide abstract]
    ABSTRACT: It is well known that the equilibration timescale for the isotopic ratios 13C/12C and 14C/12C in the ocean mixed layer is on the order of a decade, two orders of magnitude slower than for oxygen. Less widely-appreciated is the factthat the equilibration timescale is quite sensitive to the speciation of Dissolved Inorganic Carbon (DIC) in the mixed layer, scaling linearly with the ratio DIC/CO 2, which varies inversely with atmospheric pCO 2. Although this effect is included in models that resolve the role of carbon speciation in air-sea exchange, its role is often unrecognized, and it is not commonly considered in the interpretation of carbon isotope observations. Here, we use a global 3-dimensional ocean model to estimate the redistribution of the carbon isotopic ratios between the atmosphere and ocean due solely to variations in atmospheric pCO 2. Under Last Glacial Maximum (LGM) pCO 2, atmospheric Δ14 C is increased by ≈ 30 due to the speciation change, all else being equal, raising the surface reservoir age by about 250 years throughout most of the ocean. For 13 C, enhanced surface disequilibrium under LGM pCO2 causes the upper ocean, atmosphere and North Atlantic Deep Water δ13C to become at least 0.2 higher relative to deep waters ventilated by the Southern Ocean. Conversely, under high pCO2, rapid equilibration greatly decreases isotopic disequilibrium. As a result, during geological periods of high pCO2, vertical δ13C gradients may have been greatly weakened as a direct chemical consequence of the high pCO2, masquerading as very well-ventilated or biologically-deadÔStrangeloveÕ oceans. The ongoing anthropogenic rise of pCO2 is accelerating the equilibration of the carbon isotopes in the ocean, lowering atmospheric Δ14C and weakening δ13C gradients within the ocean to a degree that is similar to the traditional fossil fuel ’Suess’ effect.
    Global Biogeochemical Cycles 02/2015; DOI:10.1002/2014GB004929
  • [Show abstract] [Hide abstract]
    ABSTRACT: Over the past decade, estimates of the atmospheric CO2 uptake by continental shelf seas were constrained within the 0.18-0.45 Pg C yr−1 range. However, most of those estimates are based on extrapolations from limited datasets of local flux measurements (n < 100). Here, we propose to derive the CO2 air-sea exchange of the shelf seas by extracting 3 · 10^6 direct surface ocean CO2 measurements from the global database SOCAT (Surface Ocean CO2 Atlas), atmospheric CO2 values from GLOBALVIEW and calculating gas transfer rates using readily available global temperature, salinity and wind speed fields. We then aggregate our results using a global segmentation of the shelf in 45 units and 152 sub-units to establish a consistent regionalized CO2 exchange budget at the global scale. Within each unit, the data density determines the spatial and temporal resolutions at which the air-sea CO2 fluxes are calculated and range from a 0.5 degree resolution in the best surveyed regions to a whole unit resolution in areas where data coverage is limited. Our approach also accounts, for the first time, for the partial sea ice cover of polar shelves. Our new regionalized global CO2 sink estimate of 0.19 ± 0.05 Pg C yr−1 falls in the low end of previous estimates. Reported to an ice-free surface area of 22 · 106 km2, this value yields a flux density of 0.7 mol C m−2 yr−1, ~40% more intense than that of the open ocean. Our results also highlight the significant contribution of Arctic shelves to this global CO2 uptake (0.07 Pg C yr−1).
    Global Biogeochemical Cycles 10/2014; 28:1199-1214. DOI:10.1002/2014GB004832
  • [Show abstract] [Hide abstract]
    ABSTRACT: We compared carbon (C), nitrogen (N), and phosphorus (P) concentrations in atmospheric deposition, runoff, and soils with microbial respiration [dehydrogenase (DHA)] and ecoenzyme activity (EEA) in an ombrotrophic bog and a minerotrophic fen to investigate the environmental drivers of biogeochemical cycling in peatlands at the Marcell Experimental Forest in northern Minnesota, USA. Ecoenzymatic stoichiometry was used to construct models for C use efficiency (CUE) and decomposition (M), and these were used to model respiration (Rm). Our goals were to determine the relative C, N, and P limitations on microbial processes and organic matter decomposition, and to identify environmental constraints on ecoenzymatic processes. Mean annual water, C, and P yields were greater in the fen, while N yields were similar in both the bog and fen. Soil chemistry differed between the bog and fen, and both watersheds exhibited significant differences among soil horizons. DHA and EEA differed by watersheds and soil horizons, CUE, M, and Rm differed only by soil horizons. C, N, or P limitations indicated by EEA stoichiometry were confirmed with orthogonal regressions of ecoenzyme pairs and enzyme vector analyses, and indicated greater N and P limitation in the bog than in the fen, with an overall tendency toward P-limitation in both the bog and fen. Ecoenzymatic stoichiometry, microbial respiration, and organic matter decomposition were responsive to resource availability and the environmental drivers of microbial metabolism, including those related to global climate changes.
    Global Biogeochemical Cycles 08/2014; 120(1-3):203-224. DOI:10.1007/s10533-014-9991-0