scholarly journals Analysis of Historical Trend of Eutrophication in Lake Nakaumi, Japan, Using Concentrations of Several Index Elements in Sediment Cores

2018 ◽  
Vol 41 (5) ◽  
pp. 151-157 ◽  
Author(s):  
Kenji KUSUNOKI ◽  
Masahiro SAKATA
Keyword(s):  
Sediment Cores ◽  
Historical Trend ◽  
Lake Nakaumi

scholarly journals Simulation of Historical Trend of Hexachlorobenzene in Sediment Cores using the Emission Estimate and Dynamic Multimedia Environmental Fate Model.

2001 ◽  
Vol 11 (4) ◽  
pp. 793-804 ◽  
Author(s):  
Yasuhiro HIRAI ◽  
Toshitaka KATO ◽  
Hiroshi TAKATSUKI ◽  
Shin-ichi SAKAI
Keyword(s):  
Environmental Fate ◽  
Sediment Cores ◽  
Historical Trend ◽  
Emission Estimate ◽  
Fate Model

scholarly journals Analysis of historical trend of carotenoid concentrations in sediment cores from Lake Shinji, Japan

2012 ◽  
Vol 46 (3) ◽  
pp. 225-233 ◽  
Author(s):  
KENJI KUSUNOKI ◽  
MASAHIRO SAKATA ◽  
YUKINORI TANI ◽  
YASUSHI SEIKE ◽  
KAZUYASU AYUKAWA
Keyword(s):  
Sediment Cores ◽  
Historical Trend ◽  
Lake Shinji

Vertical profiles of legacy organochlorine pesticides in sediment cores from lake Nakaumi, Japan

Chemosphere ◽  
2021 ◽  
pp. 133254
Author(s):  
Heesoo Eun ◽  
Yun Seok Kim ◽  
Toshihiro Sakamoto ◽  
Agata Miecznikowska ◽  
Jerzy Falandysz ◽  
...  
Keyword(s):  
Organochlorine Pesticides ◽  
Sediment Cores ◽  
Vertical Profiles ◽  
Lake Nakaumi

Reconstructing historical changes in the environmental health of watersheds by using sediment cores from lakes and reservoirs in Salt Lake Valley, Utah

Fact Sheet ◽  
2000 ◽  
Author(s):  
David L. Naftz ◽  
Doyle W. Stephens ◽  
Edward Callender ◽  
Peter C. Van Metre
Keyword(s):  
Environmental Health ◽  
Salt Lake ◽  
Sediment Cores ◽  
Historical Changes ◽  
Salt Lake Valley ◽  
Lakes And Reservoirs

Water-quality trends using sediment cores from White Rock Lake, Dallas, Texas

Fact Sheet ◽  
1996 ◽  
Author(s):  
Peter C. Van Metre ◽  
Larry F. Land ◽  
C.L. Braun
Keyword(s):  
Water Quality ◽  
Sediment Cores ◽  
Water Quality Trends ◽  
Rock Lake

Spectrophotometry Measurement of Polynuclear Aromatic Hydrocarbons in Hamilton Harbour Sediments

1991 ◽  
Vol 26 (1) ◽  
pp. 1-16 ◽  
Author(s):  
T.P. Murphy ◽  
H. Brouwer ◽  
M.E. Fox ◽  
E. Nagy
Keyword(s):  
Aromatic Hydrocarbons ◽  
Total Concentration ◽  
Coal Tar ◽  
Sediment Cores ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Mass Spectrometry Analysis ◽  
Gas Chromatography Mass Spectrometry ◽  
Near Surface ◽  
Spectrometry Analysis ◽  
Hamilton Harbour

Abstract Eighty-one sediment cores were collected to determine the extent of coal tar contamination in a toxic area of Hamilton Harbour. Over 800 samples were analyzed by a UV spectrophotometric technique that was standardized with gas chromatography/mass spectrometry analysis. The coal tar distribution was variable. The highest concentrations were near the Stelco outfalls and the Hamilton-Wentworth combined sewer outfalls. The total concentration of the 16 polynuclear aromatic hydrocarbons (PAHs) in 48,300 m3 of near-surface sediments exceeded 200 µg/g.

An Assessment of Environmental Changes in Three Lakes from King's County (Nova Scotia, Canada) Using Diatom-Based Paleolimnological Techniques

2008 ◽  
Vol 43 (2-3) ◽  
pp. 85-98 ◽  
Author(s):  
Joshua R. Thienpont ◽  
Brian K. Ginn ◽  
Brian F. Cumming ◽  
John P. Smol
Keyword(s):  
Nova Scotia ◽  
Environmental Changes ◽  
Sediment Cores ◽  
Lake Management ◽  
River System ◽  
210Pb Dating ◽  
Hydroelectric Power ◽  
Diatom Assemblages ◽  
Shoreline Development ◽  
Before And After

Abstract Paleolimnological approaches using sedimentary diatom assemblages were used to assess water quality changes over the last approximately 200 years in three lakes from King's County, Nova Scotia. In particular, the role of recent shoreline development in accelerating eutrophication in these systems was assessed. Sediment cores collected from each lake were analyzed for their diatom assemblages at approximately 5-year intervals, as determined by 210Pb dating. Analyses showed that each system has changed, but tracked different ecosystem changes. Tupper and George lakes recorded shifts, which are likely primarily related to climatic warming, with diatom assemblages changing from a preindustrial dominance by Aulacoseira spp. to present-day dominance by Cyclotella stelligera. In addition to the recent climatic-related changes, further diatom changes in the Tupper Lake core between approximately 1820 and 1970 were coincident with watershed disturbances (farming, forestry, and construction of hydroelectric power infrastructure). Black River Lake has recorded an increase in diatom-inferred total phosphorus since about 1950, likely due to impoundment of the Black River system for hydroelectric generation and subsequent changes in land runoff. Before-and-after (i.e., top-bottom) sediment analyses of six other lakes from King's County provided further evidence that the region is being influenced by climatic change (decreases in Aulacoseira spp., increases in planktonic diatom taxa), as well as showing other environmental stressors (e.g., acidification). However, we recorded no marked increase in diatom-inferred nutrient levels coincident with shoreline cottage development in any of the nine study lakes. Paleolimnological studies such as these allow lake managers to place the current limnological conditions into a long-term context, and thereby provide important background data for effective lake management.

Distribution of Mercury in Lake St. Clair and the St. Clair River Sediments

1989 ◽  
Vol 24 (1) ◽  
pp. 1-22 ◽  
Author(s):  
Alena Mudroch ◽  
K. Hill
Keyword(s):  
Organic Matter ◽  
Sediment Cores ◽  
River Sediments ◽  
Size Fraction ◽  
Mineralogical Composition ◽  
Recent Sediment ◽  
Geochemical Composition ◽  
Visual Appearance ◽  
Decaying Wood ◽  
Relationship Of

Abstract Sediment cores were collected in Lake St. Clair in 1985 and in the St. Clair River in 1986 to investigate the horizontal and vertical distribution and association of Hg in the sediments. A layer of recent sediment up to about 35 cm thick was differentiated by the geochemical composition and visual appearance from the underlying glacial-lacustrine deposits. The concentration of Hg in the surficial sediments in Lake St. Clair was lower in 1985 (<0.025 to 1.200 µg/g) than that found in 1974 (<0.20 to 3.00 µg/g). Up to 8.30 µg/g of Hg were found in the sediments collected from the nearshore area at Sarnia, Ontario, in the St. Clair River in 1986. The concentrations of Hg ranged from 5.05 to 16.00 µg/g in different sand-sized fractions (0.063 to 0.350 mm) of the sediment. The concentration of Hg was 17.80 µg/g in the silt-clay size fraction (<0.063 mm). No relationship was found between the concentration of organic matter and Hg, and the concentration of silica and Hg in the St. Clair River sediments. The results indicated a relationship of Hg with particles of different mineralogical composition. Up to 3.72 µg/g Hg was found in the surface sediment in Chenal Ecarte. The greatest concentration of Hg (13.15 µg/g) existed in the 0.350 mm particle size fraction, which consisted mainly of small pieces of decaying wood. A good relationship was found between the concentration of Hg and organic matter in the sediment at this area.

RECONSTRUCTING CHANGES IN SEA ICE COVER DURING MARINE ISOTOPE STAGE 11 FROM BERING SEA SEDIMENT CORES

2018 ◽  
Author(s):  
Natalie Thompson ◽  
◽  
Beth E. Caissie
Keyword(s):  
Sea Ice ◽  
Bering Sea ◽  
Sediment Cores ◽  
Ice Cover ◽  
Marine Isotope Stage
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