搜索结果: 31-45 共查到“海洋地质学 carbon”相关记录56条 . 查询时间(0.14 秒)
Factors controlling d13C values of sedimentary carbon in hypertrophic Baldeggersee, Switzerland, and implications for interpreting isotope excursions in lake sedimentary records
Factors controlling d13C values sedimentary carbon in hypertrophic Baldeggersee Switzerland interpreting isotope excursions lake sedimentary records
2014/5/9
We use stable carbon isotope values (δ13C) in sedimented organic matter and carbonate as proxy indicators of productivity changes in a highly eutrophic to hypertrophic lake. Stable isotope data from a...
Contributions of carbon and nitrogen from the Andes Mountains to the Amazon River: Evidence from an elevational gradient of soils, plants, and river material
carbon and nitrogen Andes Mountains Amazon River elevational gradient of soils plants river material
2014/5/9
We determined the carbon (C) and nitrogen (N) elemental and stable isotopic composition of riverine and terrestrial organic matter (OM), as well as the concentration of dissolved organic C (DOC), δ15N...
Flow history explains temporal and spatial variation of carbon fractionation in stream periphyton
temporal and spatial variation carbon fractionation stream periphyton
2014/5/9
We investigated factors that contribute to isotopic carbon fractionation in periphytic biofilms in a human-altered headwater stream with a flashy hydrograph. Water velocity had an important effect on ...
Significance and mechanisms of photosynthetic production of dissolved organic carbon in a coastal eutrophic ecosystem
Signifi cance mechanisms dissolved organic
2014/5/19
We have determined the seasonal (July 2001–July 2002) and vertical variability in the photosynthetic production
of dissolved organic carbon (DOCp) and particulate organic carbon (POCp) in a coastal u...
Tissue carbon, nitrogen, and sulfur stable isotope turnover in transplanted Bathymodiolus childressi mussels: Relation to growth and physiological condition
Tissue carbon nitrogen sulfur stable isotope turnover transplanted Bathymodiolus childressi mussels growth and physiological condition
2014/5/19
The growth and physiological condition of the methanotrophic hydrocarbon seep mussel Bathymodiolus childressi reflects the habitat quality of the sites it occupies on the seafloor of the upper Louisia...
Extreme 13C enrichments in a shallow hypereutrophic lake: Implications for carbon cycling
Extreme 13C enrichment shallow hypereutrophic lake carbon cycling
2014/5/19
An analysis of stable carbon isotope (δ13C) ratios in Lake Apopka, Florida, reveals extreme 13C enrichments of dissolved inorganic carbon (DIC) pools in the water column and sediment pore water of thi...
Spatiotemporal patterns of carbon remineralization and bio-irrigation in sediments of Casco Bay Estuary, Gulf of Maine
Spatiotemporal patterns carbon mineralization bio-irrigation in sediments Casco Bay Estuary Gulf of Maine
2014/5/14
We measured the seasonal and spatial rates of organic matter decomposition and pore-water irrigation at four subtidal stations in Casco Bay estuary, Gulf of Maine. Organic carbon decomposition and ass...
Seasonal variation of the d13C and d15N of particulate and dissolved carbon and nitrogen in Lake Lugano: Constraints on biogeochemical cycling in a eutrophic lake
Seasonal variation d13C and d15N particulate and dissolved carbon and nitrogen Lake Lugano biogeochemical cycling a eutrophic lake
2014/5/14
We determined the δ13C and δ15N of water-column particulate organic matter (POM), dissolved inorganic carbon, and nitrate, together with water chemistry and phytoplankton biomass and species compositi...
Use of Keeling plots to determine sources of dissolved organic carbon in nearshore and open ocean systems
dissolved organic carbon ocean systems
2014/5/14
Abstract—We apply a Keeling mixing model commonly used in atmospheric sciences to oceanic
dissolved organic carbon (DOC)
14
C and concentrations to demonstrate that DOC distribution across
spatial...
A modern isotope record of changes in water and carbon budgets in a groundwater-fed lake: Blue Lake, South Australia
modern isotope record changes in water carbon budgets groundwater-fed lake Blue Lake South Australia
2014/5/22
Groundwater is often a major component of lake water and chemical balances. Alteration in catchment subsurface water balances through land-use change and pumping can affect lake biogeochemical cycles ...
The effect of water velocity on stable carbon and nitrogen isotope signatures of periphyton
water velocity stable carbon nitrogen isotope signatures
2014/5/22
Water movement affects carbon and nitrogen isotopic signatures of algae, possibly through effects on boundarylayer thickness. We describe a laboratory experiment carried out in artificial streams, whi...
Regional comparisons of watershed determinants of dissolved organic carbon in temperate lakes from the Upper Great Lakes region and selected regions globally
Regional comparisons watershed determinants dissolved organic carbon in temperate lakes Upper Great Lakes region selected regions globally
2014/5/22
We analyzed how dissolved organic carbon (DOC) concentration in lakes of the North American temperate forest (Upper Great Lakes region) is related to nine catchment characteristics (lake area, lake pe...
Iron requirements for dinitrogen- and ammonium-supported growth in cultures of Trichodesmium (IMS 101): Comparison with nitrogen fixation rates and iron:carbon ratios of field populations
Iron requirements nitrogen- and ammonium-supported growth cultures of Trichodesmium nitrogen fixation rates and iron field populations
2014/5/21
We quantified the relationships among the specific growth rate, intracellular iron content, and steady state iron uptake rate for cultures of the marine diazotrophic cyanobacterium Trichodesmium (IMS ...
Ultraviolet radiation blocks the organic carbon exchange between the dissolved phase and the gel phase in the ocean
Ultraviolet radiation blocks the dissolved phase
2014/5/21
Dissolved organic carbon (DOC) is one of the major reservoirs of active organic carbon on Earth. Although the
bulk of the marine DOC pool is largely composed of small refractory polymeric material, n...
Hypolimnetic oxidation rates in Lake Superior: Role of dissolved organic material on the lake’s carbon budget
Hypolimnetic oxidation rates Lake Superio
2014/5/21
On average, the water column of Lake Superior is undersaturated with respect to dissolved oxygen and supersaturated with respect to carbon dioxide during the summer-stratified period. On the bas...
