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Compound Specific Hydrogen Isotope Analysis Of Lacustrine Sediments To Establish Late Holocene Paleoprecipitation Dynamics At Laguna Arancibia Costa Rica
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Book Synopsis Compound-specific Hydrogen Isotope Analysis of Lacustrine Sediments to Establish Late-Holocene Paleoprecipitation Dynamics at Laguna Arancibia, Costa Rica by : Amanda Tomlinson
Download or read book Compound-specific Hydrogen Isotope Analysis of Lacustrine Sediments to Establish Late-Holocene Paleoprecipitation Dynamics at Laguna Arancibia, Costa Rica written by Amanda Tomlinson and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Compound-specific Stable Isotope Analyses of Late-holocene Vegetation and Precipitation Change at Laguna Los Mangos by : Elizabeth A. Yanuskiewicz
Download or read book Compound-specific Stable Isotope Analyses of Late-holocene Vegetation and Precipitation Change at Laguna Los Mangos written by Elizabeth A. Yanuskiewicz and published by . This book was released on 2019 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stable Isotope Analysis of Lake Sediments from Laguna Santa Elena and Laguna Azul, Costa Rica by : Matthew Timothy Kerr
Download or read book Stable Isotope Analysis of Lake Sediments from Laguna Santa Elena and Laguna Azul, Costa Rica written by Matthew Timothy Kerr and published by . This book was released on 2014 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lake sediments are increasingly important archives of human-environment interactions and paleoclimate in the neotropics. In Costa Rica, Anchukaitis and Horn (Palaeogeography, Palaeoclimatology, Palaeoecology 221: 35-54, 2005) established a land-use history for Laguna Santa Elena (8.9306 N, 82.9275 W, 1055 m elevation), a small lake in the Diquís archaeological region, based on pollen and charcoal analyses of a 7-meter sediment core. I carried out stable carbon and nitrogen isotope and loss-on-ignition analyses at higher resolution to extend the existing 2000-year record. The new geochemical data parallel major trends in botanical proxies but also reveal aspects of human and environmental dynamics not apparent in the prior analysis. Inferred changes in land use in the watershed are consistent with archaeological evidence. Geochemical trends strongly suggest a population collapse at the site around the time of the Terminal Classic Drought of the Mayan region. The generally close correspondence between microfossil assemblages and geochemistry in the Santa Elena core demonstrates the usefulness of stable isotope analysis as a first line of investigation in paleoenvironmental research. Sediment samples for carbon isotope analysis need to be acidified to remove carbonates that can affect isotope measurements, and debate exists over whether nitrogen isotope analysis can use these acidified samples or require non-acidified samples. My thesis research tested the effects of pre-analysis acidification of sediment and soil samples from Laguna Santa Elena and a second lake in Costa Rica, Laguna Azul (9.9558 N, 83.6519 W, 630 m elevation) in the Central Highlands-Atlantic Watershed archaeological region. Results show that acidification may cause statistically significant differences in nitrogen isotope values. These differences appear to be random and unpredictable, and can manifest as either positive or negative shifts that have the potential to alter or even reverse relative trends in nitrogen isotope signals in lake sediment profiles. More tests are needed, but the results of this analysis suggest that researchers should avoid dual-mode analysis, in which data for both stable carbon and nitrogen isotopes are obtained from a single acidified sample, and should continue analyzing an additional non-acidified sample to obtain nitrogen isotope values.
Book Synopsis Multi-proxy Stable Isotope Analyses of Late Holocene Precipitation Variability and Vegetation Change at Laguna María Aguilar, Costa Rica by : Phyllis Yu Yi Kho
Download or read book Multi-proxy Stable Isotope Analyses of Late Holocene Precipitation Variability and Vegetation Change at Laguna María Aguilar, Costa Rica written by Phyllis Yu Yi Kho and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Isotopes in Palaeoenvironmental Research by : Melanie J. Leng
Download or read book Isotopes in Palaeoenvironmental Research written by Melanie J. Leng and published by Springer Science & Business Media. This book was released on 2006-03-09 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thorough reference shows how stable isotopes can be applied to understanding the palaeoenvironment, with chapters on the interpretation of isotopes in water, tree rings, bones and teeth, lake sediments, speleothems and marine sediments. The book offers detailed advice on calibration, including a multi-proxy approach, using isotope signals from different materials or combined with other palaeoenvironmental techniques, to enhance the reliability of readings.
Book Synopsis Bulk Sedimentary and Compound-specific Hydrogen Isotope Analyses as Paleohydrologic Proxies in Carolina Bays by : Sarah Kwon
Download or read book Bulk Sedimentary and Compound-specific Hydrogen Isotope Analyses as Paleohydrologic Proxies in Carolina Bays written by Sarah Kwon and published by . This book was released on 2018 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On-line Compound-specific Hydrogen Isotopic Analysis Using Continuous-flow Isotope Ratio Mass Spectrometry by : Herbert John Tobias
Download or read book On-line Compound-specific Hydrogen Isotopic Analysis Using Continuous-flow Isotope Ratio Mass Spectrometry written by Herbert John Tobias and published by . This book was released on 1997 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Organic Geochemical Reconstructions of the Late Quaternary Climate History of the Sierra Nevada by : Joseph Horace Street
Download or read book Organic Geochemical Reconstructions of the Late Quaternary Climate History of the Sierra Nevada written by Joseph Horace Street and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic geochemical proxy measurements in sediments from Swamp Lake, Yosemite NP, in the central Sierra Nevada of California provide evidence of climatic change on millennial and centennial timescales over the last ~20,000 years. Proxy measurements in bulk sediments (TOC, TN, C/N, [delta]13Corg, [delta]15N, biogenic silica, magnetic susceptibility) record the response of the lake environment, in terms of primary productivity, OM sources, microbial OM regeneration and secondary production, and detrital input, to climate-driven changes in temperature, seasonal ice cover, lake mixing regimes, runoff and lake level. Parallel changes in the relative abundances of n-alkane biomarkers provide more specific information about lake level during the Holocene epoch. The inferred environmental changes at Swamp lake correlate with other Sierra Nevada paleo-records, and with reconstructed sea surface temperatures along the California margin. Parallel changes in the Swamp Lake and SST records over the past ~20,000 years provide new evidence that continental climate in the Sierra Nevada and the California Current system have responded, on multiple timescales, to common drivers in North Pacific ocean-atmospheric circulation. Measurements of compound-specific hydrogen isotope ratios in sedimentary leaf wax n-alkanes ([delta]Dwax) provide insight into the nature of the link between North Pacific and Sierra Nevada climate over time. The [delta]Dwax composition of Swamp Lake sediments is primarily controlled by changes in the [delta]D of precipitation, which is in turn influenced by the moisture sources and trajectories of winter storms. The Swamp Lake [delta]Dwax record reveals a long-term change in precipitation seasonality and/or storm trajectory over the Holocene, driven by seasonal insolation, as well as centennial- to millennial-scale fluctuations reflecting changes in the relative importance of northerly and southerly storm types. These apparent "regime shifts" in North Pacific atmospheric circulation resemble modern, short timescale responses to ENSO and the PDO, but their underlying causes remain unknown.
Book Synopsis Late Quaternary Histories of Lakes Huron and Michigan by : Rebecca Amy Macdonald
Download or read book Late Quaternary Histories of Lakes Huron and Michigan written by Rebecca Amy Macdonald and published by . This book was released on 2012 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: Late Quaternary histories are investigated here for sediment cores from Lakes Huron and Michigan, using the oxygen- and carbon-isotope compositions of biogenic carbonates and the oxygen- and hydrogen-isotope compositions of porewater. Age models for these cores are based on sedimentological information, and where possible, radiocarbon and pollen dates. The Michigan Basin cores provide a thick record of the late Pleistocene, whereas the Huron Basin cores primarily record Holocene deposition. Taken together, the histories recorded in biogenic carbonates from these sediments provide a clear account of lakewater isotopic changes - and their significance - over much of the history of the Great Lakes Basin. Biogenic carbonates, and ostracodes in particular, serve as excellent recorders of lakewater!18O values. Modern specimens from Lake Huron have been used to assess non-equilibrium oxygen- and carbon-isotope fractionation effects during shell formation within this setting. This information provides improved ability to calculate the oxygenisotopic compositions of paleolakewater using fossil biogenic carbonates from the cores. The fossil shell compositions indicate intervals characterized by low!18O meltwater originating from the retreating Laurentide Ice Sheet and/or associated proglacial lakes, and periods dominated by higher!18O water that are more reflective of regional precipitation, runoff and climatic conditions. Differences in the oxygen- and carbonisotope compositions of deep- versus shallower-water ostracode species in the Michigan Basin cores suggest isotopic stratification of its lakewater during the late Pleistocene. Results for previously unstudied parts of the Huron Basin suggest that sub-basins acquired different oxygen-isotope compositions during periods of very low lake levels, reflecting different water sources and/or different conditions at such times. Early Holocene influxes of glacial meltwater into the Huron Basin, and to a lesser extent the Michigan Basin, correlate with major global climate perturbations that were likely triggered by release of large volumes of glacial meltwater into the Arctic and/or North Atlantic Oceans. Porewater did not preserve original lakewater!18O and!D values. These compositions are largely controlled by downward diffusion of modern lakewater.
Download or read book Aquatic Oligochaeta written by G. Bonomi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the First International Symposium on Aquatic Oligochaete Biology in Sidney, B. C. , the suggestion was made to hold the second in Pallanza, on Lake Maggiore, at the C. N. R. -Istituto Italiano di Idrobiologia. At the same time it was decided that there should be a symposium every third year. The organization of the symposium was made considerably easier by the Senior Editor's having been in personal contact with several Russian colleagues (courtesy of a kind invitation from the U. S. S. R. Academy of Sciences), the 'Hamburg Group' and the Junior Editor. Correspondence with various students of Oligochaeta also furnished many useful suggestions. The Second International Symposium on Aquatic Oligochaete Biology was therefore held in Pallanza in late September 1982 and was attended by 53 scientists from 16 countries in Europe, North America, Asia and Australia. No review papers were formally invited as this had already been done at the first symposium: all the papers were accordingly allotted the same time for oral presentation. These proceedings contain all papers Hrabe and Slepukhina, which were given in absentia, as it presented at the symposium, including those by was impossible for the authors to join the group. The main topics were taxonomy and evolution of Oligo chaeta, life-cyle and population studies, the role of Oligo chaeta in assessing water pollution, physiolog ical studies, community and distribution studies. Special taxonomic workshops took place in the evenings.
Book Synopsis Pyrethroid Insecticides by : Ethel Eljarrat
Download or read book Pyrethroid Insecticides written by Ethel Eljarrat and published by Springer Nature. This book was released on 2020-08-04 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the latest developments concerning the analysis, fate, behaviour and toxicity of pyrethroid insecticides. Over the last few decades, pyrethroid insecticides have increasingly replaced organochlorine pesticides due to their relatively lower mammalian toxicity, selective insecticide activity and lower environmental persistence. They represent 25% of global sales of insecticides, and are considered to be “safe” since they are converted to non-toxic metabolites by oxidative metabolism in fish and by hydrolysis in mammals. However, recent studies have demonstrated their environmental ubiquity, their bioaccumulation and their toxicity in various aquatic and terrestrial organisms, and even in humans. Featuring contributions by leading experts, the book discusses the physico-chemical properties and uses of pyrethroid insecticides; the latest chemical analytical methods; their occurrence in the environment, biota and food; and their isomeric and enantiomeric behaviour. It particularly highlights the toxicological effects and human exposure to pyrethroid insecticides, and also offers insights into the effects of the salmon industry on the marine environment with a case study of sea lice treatment using pyrethroids. This comprehensive book is a valuable source of information for environmental scientists, policymakers and producers interested in issues related to pyrethroid insecticides.
Book Synopsis Limnogeology: Progress, Challenges and Opportunities by : Michael R. Rosen
Download or read book Limnogeology: Progress, Challenges and Opportunities written by Michael R. Rosen and published by Springer Nature. This book was released on 2021-04-24 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book honors the career of Professor Elizabeth Gierlowski-Kordesch who was a pioneer and leader in the field of limnogeology since the 1980s. Her work was instrumental in guiding students and professionals in the field until her untimely death in 2016. This collection of chapters was written by her colleagues and students and recognize the important role that Professor Gierlowski-Kordesch had in advancing the field of limnogeology. The chapters show the breadth of her reach as these have been contributed from virtually every continent. This book will be a primary reference for scientists, professionals and graduate students who are interested in the latest advances in limnogeologic processes and basin descriptions in North and South America, Europe, Africa, and China. *Free supplementary material available online for chapters 3,11,12 and 13. Access by searching for the book on link.springer.com
Book Synopsis Echinoderm Paleobiology by : William I. Ausich
Download or read book Echinoderm Paleobiology written by William I. Ausich and published by Indiana University Press. This book was released on 2008-07-18 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dominant faunal elements in shallow Paleozoic oceans, echinoderms are important to understanding these marine ecosystems. Echinoderms (which include such animals as sea stars, crinoids or sea lilies, sea urchins, sand dollars, and sea cucumbers) have left a rich and, for science, extremely useful fossil record. For various reasons, they provide the ideal source for answers to the questions that will help us develop a more complete understanding of global environmental and biodiversity changes. This volume highlights the modern study of fossil echinoderms and is organized into five parts: echinoderm paleoecology, functional morphology, and paleoecology; evolutionary paleoecology; morphology for refined phylogenetic studies; innovative applications of data encoded in echinoderms; and information on new crinoid data sets.
Book Synopsis In the Footsteps of Warren B. Hamilton by : Gillian R. Foulger
Download or read book In the Footsteps of Warren B. Hamilton written by Gillian R. Foulger and published by Geological Society of America. This book was released on 2022-05-03 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This unusual book, published to honor Warren Bell Hamilton, comprises a diverse, cross-disciplinary collection of bold new ideas in Earth and planetary science. This volume is a rich resource for researchers at all levels looking for interesting, unusual, and off-beat ideas to investigate or set as student projects"--
Book Synopsis Tectonics and Structural Geology: Indian Context by : Soumyajit Mukherjee
Download or read book Tectonics and Structural Geology: Indian Context written by Soumyajit Mukherjee and published by Springer. This book was released on 2018-10-30 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a compilation of findings, review and original works, on the tectonic evolution and structural detail of several terrains in India. It captures the tectonic diversity of the Indian terrain, including tectonics of India's coastal areas, the tectonic evolution of Gondwana and Proterozoic (Purana) basins. It also describes the research results of the Indian craton's geo-history, Tertiary Bengal basin, and also the Himalayan collisional zone. Thus the book covers the deformation history of Indian terrain involving strike slip, compressional and extensional tectonics, and ductile and brittle shear deformations.
Book Synopsis Tectonics and Sedimentation by : Dengliang Gao
Download or read book Tectonics and Sedimentation written by Dengliang Gao and published by AAPG. This book was released on 2013-02-20 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geoscience Data and Collections by : National Research Council
Download or read book Geoscience Data and Collections written by National Research Council and published by National Academies Press. This book was released on 2002-09-23 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geoscience data and collections (such as, rock and sediment cores, geophysical data, engineering records, and fossils) are necessary for industries to discover and develop domestic natural resources to fulfill the nation's energy and mineral requirements and to improve the prediction of immediate and long term hazards, such as land slides, volcanic eruptions and global climate change. While the nation has assembled a wealth of geoscience data and collections, their utility remains incompletely tapped. Many could act as invaluable resources in the future but immediate action is needed if they are to remain available. Housing of and access to geoscience data and collections have become critical issues for industry, federal and state agencies, museums, and universities. Many resources are in imminent danger of being lost through mismanagement, neglect, or disposal. A striking 46 percent of the state geological surveys polled by the committee reported that there is no space available or they have refused to accept new material. In order to address these challenges, Geoscience Data and Collections offers a comprehensive strategy for managing geoscience data and collections in the United States.
