A Paleohydrologic Model Applied to the Holocene Sediment Stratigraphy of Two Lakes in North-central Minnesota PDF Download
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Author: Sharon Michelle Locke
Publisher:
ISBN:
Category :
Languages : en
Pages : 554
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Author: Sharon Michelle Locke
Publisher:
ISBN:
Category :
Languages : en
Pages : 554
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Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 388
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Author: Thomas C. Winter
Publisher:
ISBN:
Category : Biogeochemical prospecting
Languages : en
Pages : 246
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Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 844
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Author:
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ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 896
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Author: Eric Petermann
Publisher: GRIN Verlag
ISBN: 3640513959
Category : Science
Languages : en
Pages : 22
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Seminar paper from the year 2008 in the subject Geography / Earth Science - Geology, Mineralogy, Soil Science, grade: 1,0, University of Canterbury (Department of Geology), course: Paleoecology and Paleolimnology, language: English, abstract: Zolitschka (1998) defined varves as laminated sediments occurring in stationary water bodies. Their striking feature is a seasonal, rhythmical build-up of thin, horizontal layers with a changing composition. Since the early 20th century, this type of sediment has been used for establishing exact geochronologies. In the course of the climate change debate, and the subsequent demand for high-resolution paleoclimatic data, they have come back into the focus of earth scientists. A crucial advantage of varved sediments is that they provide two different kinds of information on a sediment profile: an absolute chronology and high-resolution paleoclimatic information. Combining these two attributes offers an absolute dated time series of paleoclimatic proxy-data. Furthermore, additional analyses of the same profile can be dated. Varved sediments can be found in recent lakes as well as in paleolakes. However, their occurrence is limited to only a few sites as a consequence of the special circumstances necessary for their generation. Varved sediments in recent lakes are especially found in lakes, which are small and deep. These preconditions are often met by maars, where a lot of investigations are done (Brauer et al. 1999a, 1999b; Litt et al. 2001). Additionally, varved sediments are even found in ancient proglacial lakes (Moscariello et al. 2000) to give an example.
Author: Vera Markgraf
Publisher: Elsevier
ISBN: 0080525660
Category : Science
Languages : en
Pages : 484
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This book presents a novel approach in the field of global change by presenting a comprehensive analysis of interhemispheric linkages of climate, present and past, and their effects on human societies. The ultimate goal of this interhemispheric integration is to improve our understanding of causes and mechanisms of climate change to enhance our capability in predicting future changes. Given the societal interest in global change issues this book offers a new approach for the integration of global information. It will provide a reference for professional scientists, researchers and graduate students in the fields of climatology, and the earth and environmental sciences. Chapters analyse instrumental atmospheric and oceanic data to address such phenomena as El Nino/Southern Oscillation variability and other climate anomalies such as the Pacific and North Atlantic Oscillation and polar air outbreaks A new systematic methodology is presented that allows objective and verifiable reconstruction of climate fields from sparse data Especially valuable in the context of climate proxy data
Author:
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Category : Micropaleontology
Languages : en
Pages : 200
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Author: William M. Last
Publisher: Springer Science & Business Media
ISBN: 1402006284
Category : Science
Languages : en
Pages : 532
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Theory Instrumentation NIR analysis of sediment samples Uses of NIRS in palaeolimnology Future perspectives Summary References Fly-ash particles. Neil Rose 319 12. Introduction A brief history Methods of extraction and enumeration Temporal distribution Spatial distribution Source apportionment The future Summary Acknowledgements References Part III: Stable Isotope Techniques 13. Application of stable isotope techniques to inorganic and biogenic carbonates. Emi Ito 351 Introduction Nomenclature and systematics of lake-water Mg/Ca and Sr/Ca ratios of lake-water of dissolved inorganic carbon (DIC) Carbonates in lake-sediments Mollusks Ostracodes Charaphytes Isotope analysis Preparation of carbonate samples for isotope analysis Conclusions Summary Acknowledgments References 14. Carbon and oxygen isotope analysis of lake sediment cellulose: methods and applications. Brent B. Wolfe, Thomas W. D. Edwards, Richard J. Elgood & Kristina R. M. Beuning 373 xi Introduction Stable isotope tracers in lake Historical development Methods Key criteria for paleohydrologic reconstruction Applications Future research directions Summary Acknowledgements References Nitrogen isotopes in palaeolimnology. Michael R. Talbot 15. 401 Introduction Nitrogen in lakes: forms and distribution Nitrogen isotopes Nitrogen isotope studies in palaeolimnology: sampling and measurement Some examples Closing remarks Summary Acknowledgments References Glossary, acronyms and abbreviations 441 Index 493 xiii PREFACE The explosive growth of paleolimnology over the past two decades has provided impetus for the publication of this series of monographs detailing the numerous advances and new techniques being applied to the interpretation of lake histories. This is the second volume in the series and deals mainly with physical and geochemical analytical techniques.
Author: Amanda Toomey
Publisher:
ISBN:
Category : Climatic changes
Languages : en
Pages : 0
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The hydroclimate of the Great Lakes region likely changed significantly during the Holocene, or the past 11.7 ka, but determining the patterns of change, how they compare to those in adjacent regions, and their relationship to the region’s ecological history requires the development of new paleohydrologic records. In lower Michigan, which lies between Great Lakes, annual precipitation declines from lake-effect snowbelts in the west to dry areas in the east, while temperature declines northward. Climate changes on orbital to interannual timescales could have influenced both gradients, altering the availability of moisture, and producing ecological consequences. Here, to constrain this history, we present a record of water-level changes at Sunrise Lake, Michigan based on physical and chemical characteristics of the preserved sedimentary record. Geophysical surveys paired with bulk density, loss-on-ignition, and grain size analyses of four cores collected at different water depths revealed multiple distinct changes in shoreline position since lake development. Lake levels initially rose at 5.15 cal ka BP and subsequently stabilized for multiple millennia. A prominent drop in water level then followed after 3.4 cal ka BP, leading to a low water level until 1.8 cal ka BP. The highest level appears to have developed by ca. 350 years ago and persisted until today. The record displays similarities to general trends seen on regional scales with additional local influences imposed. Additionally, water-level changes at Sunrise Lake provide context for regional forest changes recorded by fossil pollen stratigraphies from the region.
