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  • 1
    Electronic Resource
    Electronic Resource
    Past atmospheric deposition of metals in northern Indiana measured in a peat core from Cowles Bog (1990)
    s.l. : American Chemical Society
    Environmental science & technology 24 (1990), S. 543-549 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00074a013
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  • 2
    Electronic Resource
    Electronic Resource
    Accumulation, Inventory, and Diagenesis of Chlorinated Hydrocarbons in Lake Ontario Sediments (1995)
    s.l. : American Chemical Society
    Environmental science & technology 29 (1995), S. 2661-2672 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00010a028
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  • 3
    Electronic Resource
    Electronic Resource
    Chemical and biological trends during lake evolution in recently deglaciated terrain (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 408 (2000), S. 161-166 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As newly formed landscapes evolve, physical and biological changes occur that are collectively known as primary succession. Although succession is a fundamental concept in ecology, it is poorly understood in the context of aquatic environments. The prevailing view is that lakes become more ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35041500
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  • 4
    Electronic Resource
    Electronic Resource
    The developmental history of Adirondack (N.Y.) lakes (1989)
    Springer
    Journal of paleolimnology 2 (1989), S. 185-206 
    Details
    ISSN: 1573-0417
    Keywords: Paleolimnology ; lake developmental history ; watershed-lake interactions ; lakewater chemistry ; Adirondacks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract We utilized paleoecological techniques to reconstruct long-term changes in lake-water chemistry, lake trophic state, and watershed vegetation and soils for three lakes located on an elevational gradient (661–1150 m) in the High Peaks region of the Adirondack Mountains of New York State (U.S.A.). Diatoms were used to reconstruct pH and trophic state. Sedimentary chrysophytes, chlorophylls and carotenoids supplied corroborating evidence. Pollen, plant macrofossils, and metals provided information on watershed vegetation, soils, and biogeochemical processes. All three lakes were slightly alkaline pH 7–8 and more productive in the late-glacial. They acidified and became less productive at the end of the late-glacial and in the early Holocene. pH stabilized 8000–9000 yr B.P. at the two higher sites and by 6000 yr B.P. at the lowest. An elevational gradient in pH existed throughout the Holocene. The highest site had a mean Holocene pH close to or below 5; the lowest site fluctuated around a mean of 6. The higher pH and trophic state of the late-glacial was controlled by leaching of base cations from fresh unweathered till, a process accelerated by the development of histosols in the watersheds as spruce-dominated woodlands replaced tundra. An apparent pulse of lake productivity at the late-glacial-Holocene boundary is correlated with a transient, but significant, expansion of alder (Alnus crispa) populations. The alder phase had a significant impact on watershed (and hence lake) biogeochemistry. The limnological changes of the Holocene and the differences between lakes were a function of an elevational gradient in temperature, hydrology (higher precipitation and lower evapotranspiration at higher elevation), soil thickness (thinner tills at higher elevation), soil type (histosols at higher elevation), vegetation (northern hardwoods at lower elevation, spruce-fir at higher), and different Holocene vegetational sequences in the three watersheds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202046
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  • 5
    Electronic Resource
    Electronic Resource
    Resolving the chronology of recent lake sediments: an example from Devils Lake, North Dakota (1989)
    Springer
    Journal of paleolimnology 2 (1989), S. 81-97 
    Details
    ISSN: 1573-0417
    Keywords: chronostratigraphy ; pollen analysis ; 210Pb dating ; North Dakota ; Salsola iberica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Devils Lake is a closed, saline lake in North Dakota; it is typical of lake basins in the Great Plains Region, where windy conditions and fluctuating water-levels disturb sediment and confound chronostratigraphy. Pollen analysis and 210Pb dating of two cores collected from bathymetrically contrasting embayments demonstrate (1) how certain agriculture-related pollen types differ in their value as chronostratigraphic markers, (2) how pollen and 210Pb stratigraphies can be reconciled to determine the approximate depth of sediment mixing, and (3) the importance of coring-site selection, especially in lakes with unstable sedimentary conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00177042
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  • 6
    Electronic Resource
    Electronic Resource
    Modern and historic accumulation rates of phosphorus in Lake Okeechobee, Florida (1998)
    Springer
    Journal of paleolimnology 20 (1998), S. 31-46 
    Details
    ISSN: 1573-0417
    Keywords: phosphorus ; Lake Okeechobee ; lead-210 dating ; eutrophication ; phosphorus loading
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Phosphorus accumulation rates in depositional zone sediments of Lake Okeechobee were determined in 11 mud-zone cores and two peat-zone cores dated by 210Pb. Although difficulties were encountered in interpreting 210Pb data from some sites, reliable dating of sediments from the mud zone of this shallow lake is possible. Sediment accumulation rates in this zone have increased during the present century by an average of about twofold, and accumulation of organic sediments in the lake during pre-settlement times apparently was much slower than during the past century. Concentrations of all forms of sedimentary P but especially nonapatite inorganic-P and organic-P also have increased since pre-settlement times and especially since about 1940. Annual P accumulation rates in the lake's sediments have increased about fourfold during the 1900s, with most of the increase occurring in the past 40–50 years. The recent accumulation rate of sedimentary P (past ~ 10 years) agrees within a factor of 1.5 with the net retention of P in the lake calculated from published input-output mass balances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007939714301
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  • 7
    Electronic Resource
    Electronic Resource
    The chemistry of lake sediments in time and space (1986)
    Springer
    Hydrobiologia 143 (1986), S. 37-44 
    Details
    ISSN: 1573-5117
    Keywords: paleolimnology ; multiple-cores ; geochemistry ; 210Pb ; pigments ; myxoxanthophyll ; Lake Minnetonka
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Five short cores (1.0–1.5 m) representing different depositional zones of an isolated bay of Lake Minnetonka, Minnesota (USA), were independently dated by 210Pb and pollen analysis and were analyzed stratigraphically for elemental chemistry (following sediment fractionation) and sedimentary pigments (including myxoxanthophyll and oscillaxanthin). Because of good dating control, short-interval time-stratigraphic units could be traced across the basin, and lake-wide accumulation rates and concentrations could be estimated. The accumulation and concentration of each component at a core-site relative to basin-wide averages provide new indices, ‘relative accumulation’ and ‘relative concentration’, that are used to evaluate three major processes controlling sediment deposition: (1) the basin-wide flux, (2) the physical redistribution of bulk sediment, and (3) the selective bio-geochemical transport and fossilization of individual sedimentary components within the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026642
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  • 8
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    Climate-driven hydrologic transients in Holocene lake records (2021)
    In:  http://aquaticcommons.org/id/eprint/15813 | 8 | 2014-12-09 00:17:41 | 15813
    Details
    Publication Date: 2021-07-10
    Description: Understanding the link between climate and regional hydrologic processes is of primary importance in estimating the possible impact of future climate change and in the validation of climate models that attempt to simulate such changes. Two distinct problems need to be addressed: quantitatively establishing the link between changes in climate and the hydrologic cycle, and determining how these changes are expressed over differing temporal and spatial scales. To solve these problems, our interdisciplinary group is studying important aspects of hydrology, paleolimnology, geochemistry, and paleontology as they apply to climate-driven hydrologic changes.
    Keywords: Atmospheric Sciences ; Chemistry ; Earth Sciences ; Limnology ; PACLIM ; hydrology
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 211-215
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  • 9
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    Twentieth century water quality trends in Minnesota lakes compared with presettlement variability (2005)
    National Research Council Canada
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © National Research Council Canada, 2004. This article is posted here by permission of National Research Council Canada for personal use, not for redistribution. The definitive version was published in Canadian Journal of Fisheries and Aquatic Sciences 61 (2004): 561-576, doi:10.1139/F04-015.
    Description: A diatom-based transfer function was used to reconstruct water chemistry before European settlement in 55 Minnesota lakes. The lakes span three natural ecoregions, which differ in their history of land use, as well as in surficial geology, climate, and vegetation. Postsettlement trends were compared with water chemistry change reconstructed from two presettlement core sections (circa 1750 and 1800) as a measure of natural variability. Presettlement water quality changes were generally small and nondirectional in all three ecoregions. In contrast, half of the urban lakes showed a statistically significant increase in chloride, whereas 30% of urban and 30% of agricultural region lakes record a statistically significant increase in total phosphorus between 1800 and the present. These changes, which are attributed to road salt and nutrient runoff, are strongly correlated with the percentage of watershed area that is developed (residential or urban) in the case of chloride increases and the percentage of developed (metropolitan areas) or agricultural (agricultural areas) land in the case of nutrient increases. Water quality has changed little since 1800 for lakes in the forested regions of northeastern Minnesota. The few changes that are seen in this region are likely related to natural variations in climate or catchment soils.
    Description: This work was funded by the Minnesota Legislature as recommended by the Legislative Commission on Minnesota Resources through a grant to the Minnesota Pollution Control Agency.
    Keywords: Presettlement water quality
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: 1116310 bytes
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  • 10
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    Mercury flux to sediments of Lake Tahoe, California-Nevada (2010)
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Water, Air, & Soil Pollution 210 (2010): 399-407, doi:10.1007/s11270-009-0262-y.
    Description: We report estimates of mercury (Hg) flux to the sediments of Lake Tahoe, California-Nevada: 2 and 15-20 µg/m2/yr in preindustrial and modern sediments, respectively. These values result in a modern to preindustrial flux ratio of 7.5-10, which is similar to flux ratios recently reported for other alpine lakes in California, and greater than the value of 3 typically seen worldwide. We offer plausible hypotheses to explain the high flux ratios, including (1) proportionally less photoreduction and evasion of Hg with the onset of cultural eutrophication and (2) a combination of enhanced regional oxidation of gaseous elemental Hg and transport of the resulting reactive gaseous Hg to the surface with nightly downslope flows of air. If either of these mechanisms is correct, it could lead to local/regional solutions to lessen the impact of globally increasing anthropogenic emissions of Hg on Lake Tahoe and other alpine ecosystems.
    Description: Funding was provided by Miami University, EPA-STAR, the Postdoctoral Scholar Program at Woods Hole Oceanographic Institution, and the USGS.
    Keywords: Mercury ; Sediment ; Lake Tahoe ; Alpine
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
    Format: application/pdf
    Format: image/jpeg
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