Showing papers in "Marine Chemistry in 2001"

TL;DR: In this article, the authors investigated the presence and metabolic activity of distinctive methane-related biota in the cold seep carbonates and an associated microbial mat and found that the arboricity of these organisms indicates a pronounced role of particular Archaea in the biogeochemical cycling of carbon at methane seeps.

TL;DR: In this paper, the results of batch and flow-through reactions were combined with data on sediment composition and pore water silicic acid profiles to identify processes controlling the solubility of biogenic silica and the build-up of silica acid in marine sediments.

TL;DR: In this article, a chemical signature for mangrove, terrestrial and marine-derived organic matter was established for a tropical estuary in North Brazil based on lignin-derived phenols and stable carbon isotopes.

TL;DR: A simple solid-phase extraction technique employing Biobeads SM-2 and Amberlite XAD-16 resins for concentrating naturally occurring dissolved iron-binding compounds from large volumes of seawater is presented, illustrating that the functional groups previously shown to be present in marine and terrestrial siderophores extracted and purified from laboratory cultures are also present in the natural marine environment.

TL;DR: In this paper, a high-sensitivity cobalt speciation method was developed and applied to a profile in the North Atlantic, which included examining the redox chemistry of the analytical system and calibrating the electroactive cobalt ligand dimethylglyoxime (DMG) using EDTA as a model ligand.

TL;DR: Domoic acid may be particularly important in solubilizing particulate iron suspended in these coastal waters where Pseudo-nitzschia blooms tend to occur and may include the acquisition (iron) or detoxification (copper) of trace metals in seawater.

TL;DR: Examination of fatty acid data of plankton sampled in other areas revealed that the plankton in the current study may have been unusual in providing fatty acids at levels required by the bivalves.

TL;DR: In this paper, a box model was used to calculate the seawater, phosphorus, nitrogen and silicate budgets of the South China Sea (SCS) in both the wet and dry seasons, and the results point out an intermediate water outflow (350-1350m depth) into the West Philippine Sea (WPS) through the Bashi Channel, though this, along with the nutrients it carries, is slightly larger in the dry season (2 Sv) than in the wet (1.8 Sv).

TL;DR: The spatial and temporal changes in vertical distribution of soluble Fe (0.2 μm, labile at pH 3.2) were observed in deep water at coastal stations both in September 1998 and February 1999.

TL;DR: In this paper, a comprehensive study of air-sea interactions focused on improving the quantification of CO2 fluxes and gas transfer velocities was performed within a large open ocean CO2 sink region in the North Atlantic.

TL;DR: Analysis of phytoplankton blooms in two mesocosms differing in biomass levels, phy toplankon species composition and nutrient availability suggests that phytopsized blooms can lead to different short- and long-term variations in the concentrations of DOC, DCNS and DCAA.

TL;DR: In this paper, the levels of dissolved and particle-associated n -alkanes, alkylbenzenes, phthalates, PAHs, anionic surfactants and surfactant fluorescent organic matter (SFOM) were measured in sea-surface microlayer (SML) and sub-surface water (SSL) samples collected in the Leghorn marine environment in September and October 1999.

TL;DR: In this article, the dominant biogeochemical processes at the chemocline of a shallow brackish fjord were investigated to quantify the dominant biological processes in the water column.

TL;DR: In this article, a method was developed to determine the extent of cobalt complexation with organic ligands in seawater, and applied to samples from the North Eastern Atlantic Ocean.

TL;DR: In this paper, the ANTARES 3/F-JGOFS cruise was used to measure the concentrations of dissolved iron and manganese in the waters around the Kerguelen archipelago.

TL;DR: In this paper, the quantum yield spectra for 14 samples of seawater from environments ranging from a turbid, eutrophic bay to the Gulf Stream were determined, showing that most highly absorbing and quickly faded terrestrial chromophores are not those directly responsible for DIC photoproduction.

TL;DR: In this article, three core sediments (YSA10, YSB7 and YSC5) were collected from the Yellow Sea to determine the composition of n-alkanes and polycyclic aromatic hydrocarbons (PAHs) by GC.

TL;DR: In this paper, solid phase phosphorus (P) speciation and benthic phosphate fluxes have been determined in Arabian Sea sediments and a good correlation between Benthic phosphorous fluxes and Pfish accumulation rates suggest that benthicity fluxes are to a large extent governed by dissolution of biogenic apatite.

TL;DR: The concentrations of carbohydrates, including uronic acids, in dissolved and colloidal phases were measured in estuarine waters of Galveston Bay, TX, in order to study their role in heavy metal detoxification as mentioned in this paper.

TL;DR: In this article, an intercomparison of methods for the determination of 234Th in seawater is discussed, and small volume (2 and 5 l) methods are presented, which are based on the coprecipitation of thorium with Mn oxides followed by direct beta counting of the precipitate.

TL;DR: In this paper, the speciation of sedimentary sulfur (pyrite, acid volatile sulfides (AVS), S-0 H2S, and sulfate) was analyzed in surface sediments recovered at different water depths from the northwestern margin of the Black Sea.

TL;DR: Examination of biomarker lipids has helped clarify trophic interactions for these Antarctic amphipods, and revealed annual differences in their food sources.

TL;DR: In this article, ammonium pyrrolidine dithiocarbamate (APDC) solvent extraction/Hg exchange back-extraction method, arsenic concentrations and lead isotope ratios were determined on seawater samples from nine tropical north Australian estuarine and coastal areas.

TL;DR: This paper showed that rainwater Fe(II)(aq) is stable against oxidation for more than 4 h in seawater and Fe(III) is protected against rapid precipitation when added to coastal or oligotrophic seawater.

TL;DR: In this paper, it was demonstrated that both Porphyra spp. and Enteromorpha spp display similar and very marked seasonal variations in their concentration factor (CF) of Cu, Pb, Cd and Hg in field conditions.

TL;DR: In-situ benthic flux studies were conducted at three stations in Upper Galveston Bay twice during March 1996 to directly measure release rates of dissolved Mn, Fe, Ni and Zn from the sediments.

TL;DR: In this article, measurements of methane (CH 4 ) made during two surveys in the eastern and central Arabian Sea in April-May, 1996, and August-September, 1997, corresponding to late Spring Intermonsoon (SI) and Southwest Monsoon (SWM) seasons, respectively, revealed high spatial and temporal variability in surface saturation (110-2521%).

TL;DR: In this paper, the Southern Bight of the North Sea and the Scheldt estuary in the period 1991-1999 were investigated and dissolved and particulate mercury and methylmercury concentrations were determined.

TL;DR: In this paper, a theoretical study of the relaxation of the boric acid-borate equilibrium in seawater is presented, where the authors present a theoretical model for the boron-borate equilibrium.

TL;DR: In this paper, a method was developed for the determination of the 129I and 127I in iodide and iodate species in seawater, and the results indicated that this method can be also used for the investigation of the transport, dispersion and mixture of water masses by using 129I discharged from reprocessing facilities as a tracer.