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Biogeosciences
Scopus
ISSN 1726-4170 · Copernicus Publications · 6.592 artikel di indeks
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Assessment of the Cape Blanc (northwest Africa) upwelling ecosystem response to recent climate change, using wavelet analyses on dinoflagellate cyst export
Accelerated rates of change in recent climate have urged comprehensive investigations of its impact on marine ecosystems, notably those with high bio-, socio-, and economic importance, such as the upwelling ecosystem off Cape Blanc, Northwest Africa. This paper discusses how phyto- and…
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Carbon sequestration along a gradient of tidal marsh degradation in response to sea level rise
Tidal marshes are considered one of the world's most efficient ecosystems for belowground organic carbon sequestration and hence climate mitigation. Marsh systems are however also vulnerable to degradation due to climate-induced sea level rise, whereby marsh vegetation conversion to open water…
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Perturbation increases source-dependent organic matter degradation rates in estuarine sediments
Despite a relatively small surface area on Earth, estuaries play a disproportionally important role in the global carbon cycle due to their relatively high primary production and rapid organic carbon processing. Estuarine sediments are highly efficient in preserving organic carbon and thus often…
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Proteomic and biogeochemical perspectives on cyanobacteria nutrient acquisition – Part 2: quantitative contributions of cyanobacterial alkaline phosphatases to bulk enzymatic rates in the subtropical North Atlantic
Microbial enzymes alter marine biogeochemical cycles by catalyzing chemical transformations that bring elements into and out of particulate organic pools. These processes are often studied through enzyme rate-based estimates and nutrient-amendment bioassays, but these approaches are limited in…
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Proteomic and biogeochemical perspectives on cyanobacteria nutrient acquisition – Part 1: Zonal gradients in phosphorus and nitrogen acquisition and stress revealed by metaproteomes of Prochlorococcus and Synechococcus
Ocean productivity is maintained by key nutrients, including nitrogen, phosphorus and trace metals. The magnitude and stoichiometry of nutrient fluxes to the ocean is changing. Here, we investigate how natural assemblages of marine microbes in the subtropical North Atlantic respond to variation in…
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Reconstruction and spatiotemporal analysis of global surface ocean pCO2 considering sea area characteristics
The partial pressure of carbon dioxide (pCO2) on the surface of the ocean is crucial for quantifying and evaluating the ocean carbon budget. Insufficient consideration of the effects at the sea area scale makes it difficult to comprehensively evaluate the spatiotemporal distribution characteristics…
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Monthly element ∕ Ca trends and inter chamber variability in two planktic Foraminifera species: Globigerinoides ruber albus and Turborotalita clarkei from a hypersaline oligotrophic sea
Environmental and biological factors influence the trace element composition (element / Ca) of planktic foraminifer shells. Consequently, the element / Ca measured in these shells (tests) are utilized as proxies to reconstruct past oceanic and climatic conditions. As single shell analyses are…
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Northward shift of boreal tree cover confirmed by satellite record
The boreal forest has experienced the fastest warming of any forested biome in recent decades. While vegetation–climate models predict a northward migration of boreal tree cover, the long-term studies required to test the hypothesis have been confined to regional analyses, general indices of…
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Conceptualising carbon cycling pathways across different land-use types based on rates and ages of soil-respired CO2
Soil carbon dioxide (CO2) efflux constitutes a major carbon (C) transfer from terrestrial ecosystems to the atmosphere, driven by numerous metabolic and allocation processes in the plant-soil system. Land use affects key components of C cycling pathways through vegetation type, C allocation…
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Spatiotemporal variability and environmental controls on aquatic methane emissions in an Arctic permafrost catchment
Understanding spatiotemporal dynamics and drivers of methane (CH4) fluxes from rapidly changing permafrost regions is critical for improving our understanding of such changes. Between May and August 2023 and 2024, we measured CH4 using floating chambers in a small Arctic permafrost catchment on…
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A novel laser-based spectroscopic method reveals the isotopic signatures of nitrous oxide produced by eukaryotic and prokaryotic phototrophs in darkness
Prokaryotic and eukaryotic microscopic phototrophs (“microalgae”) can synthesize the potent greenhouse gas and ozone depleting pollutant nitrous oxide (N2O). However, we do not know how much microalgae contribute to aquatic N2O emissions because these organisms co-occur with prolific N2O producers…
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Spatiotemporal heterogeneity in diazotrophic communities reveals novel niche zonation on the continental shelf of the East China Sea
The East China Sea (ECS) continental shelf is a hotspot for studying nitrogen fixation in the marginal seas of the western Pacific, where this microbially mediated process is profoundly influenced by both the coastal and oceanic current systems. Yet, how physical forcing controls the biogeography…
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Sea-level rise in a coastal marsh: linking increasing tidal inundation, decreasing soil strength and increasing pond expansion
Coastal marsh conversion into ponds, which may be triggered by sea-level rise, is considered an important driver of marsh loss and their valuable ecosystem services. Previous studies have focused on the role of wind waves in driving the expansion of interior marsh ponds, through lateral erosion of…
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Drivers of phytoplankton bloom interannual variability in the Amundsen and Pine Island Polynyas
The Amundsen Sea Embayment (ASE) experiences both the highest ice shelf melt rates and the highest biological productivity in West Antarctica. Using 19 years of satellite data and modelling output, we investigate the long-term influence of environmental factors on the phytoplankton bloom in the…
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BrGDGT-based palaeothermometer in drylands: the necessity to constrain aridity and salinity as confounding factors to ensure the robustness of calibrations
Past temperature reconstructions offer valuable insights into the impact of climate change on the global climate-human-vegetation system. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are recognized as effective temperature proxies, particularly in lakes and peatlands, where they are…
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Machine-learning models of δ13C and δ15N isoscapes in Amazonian wood
Illegal logging is one of the most prevalent environmental infractions in the Amazon, led by organized networks that cause substantial ecological and economic impacts. Official control mechanisms, such as Brazil’s Forest Origin Document (DOF), remain vulnerable to the fraudulent manipulation of…
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Seasonality of the North Pacific Oligotrophic Gyre area in the past two decades and a modelling perspective for the 21st century
As the largest oligotrophic ocean globally, the North Pacific oligotrophic ocean gyre (NPOG) exhibits pronounced variability on seasonal, decadal, and centennial time scales. Notably, changes in the seasonality of the NPOG are thought to have larger effects on marine ecosystems than changes in its…
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Effects of fire and grazing on biogeochemical cycles in Brazilian pastures using LPJmL5-Pasture-Burning
Farmers across the world frequently use fire during the winter or dry season, to remove accumulated dead pasture biomass. These fire-management practices have profound effects on vegetation, soil nutrients, and biogeochemical cycles, yet they are rarely represented in process-based fire models…
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A comprehensive porewater isotope model for simulating benthic nitrogen cycling: description, application to lake sediments, and uncertainty analysis
The combination of various nitrogen (N) transformation pathways (mineralization, nitrification, denitrification, DNRA, anammox) modulates the fixed-N availability in aquatic systems, with important environmental consequences. Several models have been developed to investigate specific processes and…
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Community structures and taphonomic controls on benthic foraminiferal community from an Antarctic Fjord (Edisto Inlet, Victoria Land)
Benthic foraminiferal assemblages are key indicators for reconstructing past environmental conditions due to their ecological preference and preservation potential. This study investigates the hard-shelled benthic foraminifera of Edisto Inlet; an Antarctic fjord located on the Northern Victoria…
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