Global Biogeochemical Cycles (GLOBAL BIOGEOCHEM CY )
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.
- Impact factor4.68Show impact factor historyHide impact factor history
- 5-year impact5.85
- Cited half-life8.80
- Immediacy index0.75
- Article influence2.66
- WebsiteGlobal Biogeochemical Cycles website
- Other titlesGlobal biogeochemical cycles
- Material typePeriodical, Internet resource
- Document typeJournal / Magazine / Newspaper, Internet Resource
- Author can archive a pre-print version
- Author can archive a post-print version
- Preprints and Authors final version on Authors own or departmental website
- Set statements to accompany pre-print, submitted, accepted and published articles
- Publisher copyright and source must be acknowledged
- Publisher's version/PDF must be used in Institutional Repository 6 months after publication.
- Classification green
Publications in this journal
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ABSTRACT:  Temperature-dependent remineralization of organic matter is, in general, not included in marine biogeochemistry models currently used for Coupled Model Intercomparison Project Phase 5 (CMIP5) climate projections. Associated feedbacks have therefore not been quantified. In this study we aim at investigating how temperature-dependent remineralization rates (Q10 = 2) in a warming ocean impact on the marine carbon cycle, and if this may weaken the oceanic sink for anthropogenic CO2. We perturb an Earth system model used for CMIP5 with temperature-dependent remineralization rates of organic matter using representative concentration pathway (RCP)8.5-derived temperature anomalies for 2100. The result is a modest change of organic carbon export but also derived effects associated with feedback processes between changed nutrient concentrations and ecosystem structure. As more nutrients are recycled in the euphotic layer, increased primary production causes a depletion of silicate in the surface layer as opal is exported to depth more efficiently than particulate organic carbon. Shifts in the ecosystem occur as diatoms find less favorable conditions. Export production of calcite shells increases causing a decrease in alkalinity and higher surface pCO2. With regard to future climate projections, the results indicate a reduction of oceanic uptake of anthropogenic CO2 of about 0.2 PgC yr−1 toward the end of the 21st century in addition to reductions caused by already identified climate-carbon cycle feedbacks. Similar shifts in the ecosystem as identified here, but driven by external forcing, have been proposed to drive glacial/interglacial changes in atmospheric pCO2. We propose a similar positive feedback between climate perturbations and the global carbon cycle but driven solely by internal biogeochemical processes.Global Biogeochemical Cycles 12/2013;
- Global Biogeochemical Cycles 12/2013; 27:1-13.
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ABSTRACT: We have investigated here the structure of the pelagic microbial food web and quantified the carbon fluxes from viruses to microplankton along trophic gradients in the Mediterranean Sea. To explore the complex trophic pathways of the pelagic food web, we conducted independent and replicated experiments to measure (i) predation on prokaryotes by microzooplankton, (ii) predation on prokaryotes by heterotrophic nanoflagellates, (iii) virus-induced prokaryotic mortality, and (iv) microzooplankton grazing on nanoplankton and microphytoplankton. Our study covered more than 5000 km, from the Atlantic Ocean to the Levantine basin, and from conditions of high primary production and nutrient availability to ultraoligotrophic and phosphate-limited waters. Microphytoplankton abundance and biomass were typically scarce across the entire Mediterranean basin, with almost negligible levels in the eastern part. Also, nanoplankton biomass was typically low. Conversely, prokaryotes, and particularly the heterotrophic components, were abundant and represented the only significant food source for both nanoplankton and microplankton grazers. Viral infections were not the primary agents of prokaryotic mortality, but in some areas, such as the Ligurian Sea, they had a key role in prokaryotic dynamics. The scenario depicted in this study in summer reveals the pivotal role of microzooplankton in the pelagic food web of the Mediterranean Sea, with a key role in the potential transfer of biomass to higher trophic levels. We also show that converse to theoretical expectations, the microbial food web was relatively complex under the mesotrophic conditions (Atlantic and western Mediterranean) and was much more simplified in the ultraoligotrophic conditions of the eastern Mediterranean.Global Biogeochemical Cycles 10/2013; 27:1-12.
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.
ISSN: 1879-1026, Impact factor: 3.26
ISSN: 1877-3435, Impact factor: 3.17
Zhongguo sheng tai xue xue hui, Elsevier
ISSN: 1758-2229, Impact factor: 2.71
Institute of Physics (Great Britain)
ISSN: 1748-9326, Impact factor: 3.58
Estuarine Research Federation;...
ISSN: 1559-2723, Impact factor: 2.56
American Meteorological Society,...
ISSN: 1558-8424, Impact factor: 2.02