Assessment of δ13C and C/N ratios in bulk organic matter as palaeosalinity indicators in Holocene and Lateglacial isolation basin sediments, northwest Scotland

2007 ◽  
Vol 22 (6) ◽  
pp. 579-591 ◽  
Author(s):  
Elizabeth A. V. Mackie ◽  
Jeremy M. Lloyd ◽  
Melanie J. Leng ◽  
Michael J. Bentley ◽  
Carol Arrowsmith
Keyword(s):  
Organic Matter ◽  
Bulk Organic Matter ◽  
Isolation Basin

scholarly journals A multi-proxy approach to assessing isolation basin stratigraphy from the Lofoten Islands, Norway

2011 ◽  
Vol 75 (1) ◽  
pp. 288-300 ◽  
Author(s):  
Nicholas L. Balascio ◽  
Zhaohui Zhang ◽  
Raymond S. Bradley ◽  
Bianca Perren ◽  
Svein Olaf Dahl ◽  
...  
Keyword(s):  
Sea Level ◽  
Threshold Elevation ◽  
Coastal Lake ◽  
New Techniques ◽  
X Ray ◽  
Lofoten Islands ◽  
Marine Influence ◽  
Bulk Organic Matter ◽  
Transitional Phase ◽  
Isolation Basin

AbstractThis study takes a comprehensive approach to characterizing the isolation sequence of Heimerdalsvatnet, a coastal lake in the Lofoten Islands, northern Norway. We use established methods and explore new techniques to assess changes in marine influence. Bathymetric and sub-bottom profiles were acquired to examine basin-wide sedimentation and a 5.8 m sediment core spanning the last 7800 cal yr BP was analyzed. We measured magnetic susceptibility, bulk organic matter properties, molecular biomarkers, diatom assemblages, and elemental profiles acquired by scanning X-ray fluorescence. These characteristics of the sediment reflect detailed changes in salinity and water column conditions as the lake was progressively isolated. Three distinct litho/chemo-stratigraphic units represent a restricted marine phase (7800–6500 cal yr BP), a transitional phase characterized by intermittent marine influence (6500–4900 cal yr BP), and complete isolation and freshwater sedimentation (4900 cal yr BP to present). Although there are uncertainties in the estimate of the threshold elevation of the lake, the timing of these phases generally corresponds with previous interpretations of the local relative sea-level history. This record captures sea-level regression following the Tapes transgression and supports the interpretation of a subsequent sea-level stillstand, dated in Heimerdalsvatnet from 6500 to 4900 cal yr BP.

Impact of hydraulic loading rate and media type on removal of bulk organic matter and nitrogen from primary effluent in a laboratory-scale soil aquifer treatment system

2013 ◽  
Vol 68 (1) ◽  
pp. 217-226 ◽  
Author(s):  
Chol D. T. Abel ◽  
Saroj K. Sharma ◽  
Ervin Buçpapaj ◽  
Maria D. Kennedy
Keyword(s):  
Organic Matter ◽  
Loading Rate ◽  
Ammonium Nitrogen ◽  
Silica Sand ◽  
Soil Aquifer Treatment ◽  
Nitrogen Reduction ◽  
Hydraulic Loading Rate ◽  
Hydraulic Loading ◽  
Media Type ◽  
Bulk Organic Matter

The effect of hydraulic loading rate (HLR) and media type on the removal of bulk organic matter and nitrogen from primary effluent during soil aquifer treatment was investigated by conducting laboratory-scale soil column studies. Two soil columns packed with silica sand were operated at HLRs of 0.625 and 1.25 m/d, while a third column was packed with dune filtering material and operated at HLR of 1.25 m/d. Bulk organic matter was effectively removed by 47.5 ± 1.2% and 45.1 ± 1.2% in silica sand columns operated at 0.625 and 1.25 m/d, respectively and 57.3 ± 7.6% in dune filtering material column operated at 1.25 m/d. Ammonium-nitrogen reduction of 74.5 ± 18.0% was achieved at 0.625 m/d compared to 39.1 ± 4.3% at 1.25 m/d in silica sand columns, whereas 49.2 ± 5.2% ammonium-nitrogen reduction was attained at 1.25 m/d in the dune filtering material column. Ammonium-nitrogen reduction in the first 3 m was assumed to be dominated by nitrification process evidenced by corresponding increase in nitrate. Part of the ammonium-nitrogen was adsorbed onto the media, which was observed at higher rates between 3 and 5 m in silica sand column operated at HLR of 0.625 m/d and dune filtering material column operated at 1.25 m/d compared to 1.25 m/d silica.

Tracing soil organic carbon in the lower Amazon River and its tributaries using GDGT distributions and bulk organic matter properties

2012 ◽  
Vol 90 ◽  
pp. 163-180 ◽  
Author(s):  
Jung-Hyun Kim ◽  
Claudia Zell ◽  
Patricia Moreira-Turcq ◽  
Marcela A.P. Pérez ◽  
Gwenaël Abril ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Amazon River ◽  
Bulk Organic Matter

scholarly journals Habitat Partitioning in the Marine Sector of Karst Subterranean Estuaries and Bermuda's Marine Caves: Benthic Foraminiferal Evidence

2021 ◽  
Vol 8 ◽  
Author(s):  
Jacquelyn N. Cresswell ◽  
Peter J. van Hengstum
Keyword(s):  
Organic Matter ◽  
Benthic Foraminifera ◽  
Organic Matter Content ◽  
Matter Content ◽  
Habitat Partitioning ◽  
Benthic Habitat ◽  
Marine Plankton ◽  
Organic Matter Sources ◽  
Bulk Organic Matter ◽  
Subterranean Estuaries

Karst subterranean estuaries (KSEs) are created from the two- and three-way mixing of saline groundwater, rain, and oceanic water in the subsurface on carbonate landscapes, and this hydrographic framework promotes unique physical processes, biogeochemical cycling, and biological communities. Here we provide evidence that the source and quantity of particulate organic matter (POM) that is delivered to the benthos strongly correlates to benthic habitat partitioning in the oxygenated marine sectors of KSEs. A dataset of benthic foraminifera at 128 different locations from several large flooded cave systems in Bermuda were compiled and evaluated against common environmental characteristics (e.g., tidal exposure, substrate particle size, bulk organic matter, C:N, total organic carbon, and δ13Corg). Benthic areas receiving more carbon isotopically depleted organic matter sources (mean δ13Corg values < −23.2‰, C:N ratios >11), most likely from the terrestrial surface and some marine plankton, were dominated by Trochammina inflata, Bolivina spp., and Helenina anderseni. In contrast, benthic areas receiving more carbon isotopically enriched organic matter sources (mean δ13Corg values > −21.6‰, C:N ratios <10), most likely from marine plankton transported through marine cave openings cave from adjacent coastal waters, were dominated by Spirophthalmidium emaciatum, Spirillina vivipara, Patellina corrugata, and Rotaliella arctica. The benthic foraminifera most distal from any cave entrances were dominated by taxa also known from the deep-sea (e.g., Rotaliella, Spirophthalmidium) in sediment with the lowest bulk organic matter content (mean: 6%), or taxa that prefer hard substrates and are potentially living attached to cave walls (Patellina, Spirillina). While physical groundwater characteristics (e.g., salinity, dissolved oxygen) are expected drivers of benthic ecosystems in KSEs, these results suggest that POM source, quantity, and delivery mechanisms (e.g., groundwater-seawater circulation mechanisms, terrestrial flux) play an important role in benthic habitat partitioning and the spatial variability of biogeochemical cycles in the oxygenated marine sector of KSEs.

Molecular Simulation of Bulk Organic Matter in Type II Shales in the Middle of the Oil Formation Window

2014 ◽  
Vol 28 (12) ◽  
pp. 7457-7466 ◽  
Author(s):  
Julien Collell ◽  
Philippe Ungerer ◽  
Guillaume Galliero ◽  
Marianna Yiannourakou ◽  
François Montel ◽  
...  
Keyword(s):  
Organic Matter ◽  
Molecular Simulation ◽  
Type Ii ◽  
Bulk Organic Matter ◽  
Oil Formation

scholarly journals Carbon stable isotope analyses of mosses—comparisons of bulk organic matter and extracted nitrocellulose

2007 ◽  
Vol 18 (8) ◽  
pp. 1453-1458 ◽  
Author(s):  
Grzegorz Skrzypek ◽  
Adam Kałużny ◽  
Mariusz O. Jędrysek
Keyword(s):  
Organic Matter ◽  
Stable Isotope ◽  
Carbon Stable Isotope ◽  
Stable Isotope Analyses ◽  
Bulk Organic Matter ◽  
Isotope Analyses

Post-glacial variations in distributions, 13C and 14C contents of aliphatic hydrocarbons and bulk organic matter in three types of British acid upland soils

1996 ◽  
Vol 24 (3) ◽  
pp. 273-287 ◽  
Author(s):  
Yongsong Huang ◽  
Roland Bol ◽  
Douglas D. Harkness ◽  
Philip Ineson ◽  
Geoffrey Eglinton
Keyword(s):  
Organic Matter ◽  
Aliphatic Hydrocarbons ◽  
Bulk Organic Matter ◽  
Upland Soils

Thermodynamic and Structural Characterization of Bulk Organic Matter in Chinese Silurian Shale: Experimental and Molecular Modeling Studies

2017 ◽  
Vol 31 (5) ◽  
pp. 4851-4865 ◽  
Author(s):  
Liang Huang ◽  
Zhengfu Ning ◽  
Qing Wang ◽  
Rongrong Qi ◽  
Jing Li ◽  
...  
Keyword(s):  
Organic Matter ◽  
Molecular Modeling ◽  
Structural Characterization ◽  
Modeling Studies ◽  
Molecular Modeling Studies ◽  
Bulk Organic Matter
Sign in / Sign up

Export Citation Format

Share Document