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Holocene Environmental Variability In The South West Pacific Recorded In Lake Lanotoo Sediment Archives Samoa
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Book Synopsis Holocene Environmental Variability in the South-west Pacific Recorded in Lake Lanoto'o Sediment Archives, Samoa by : Henry William Pearson
Download or read book Holocene Environmental Variability in the South-west Pacific Recorded in Lake Lanoto'o Sediment Archives, Samoa written by Henry William Pearson and published by . This book was released on 2014 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Holocene Environmental Variability Inferred from Lake Sediments, Southwest Yukon Territory, Canada by : Joan Bunbury
Download or read book Holocene Environmental Variability Inferred from Lake Sediments, Southwest Yukon Territory, Canada written by Joan Bunbury and published by . This book was released on 2009 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Holocene Paleo-environmental Variability Reconstructed from a Lake Sediment Record from Southeast Greenland by : Gregory Andrew De Wet
Download or read book Holocene Paleo-environmental Variability Reconstructed from a Lake Sediment Record from Southeast Greenland written by Gregory Andrew De Wet and published by . This book was released on 2013 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reconstructing Late Holocene Artctic Climate Change Using High Resolution Sediment Records from Simpson Lagoon, Alaska and the Colville River Alluvial Valley by : Andrea Jo Miller Hanna
Download or read book Reconstructing Late Holocene Artctic Climate Change Using High Resolution Sediment Records from Simpson Lagoon, Alaska and the Colville River Alluvial Valley written by Andrea Jo Miller Hanna and published by . This book was released on 2015 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arctic nearshore environments proximal to large rivers, like Simpson Lagoon, Alaska, potentially contain high-resolution sediment archives that can be utilized to reconstruct paleoclimate variability over the late Holocene. The ongoing, rapid environmental changes recently observed in the Arctic highlight the need for high-resolution records of pre-industrial climate change in this climatically sensitive region; such records are fundamental for understanding recent anthropogenic changes in the context of natural variability. This dissertation utilizes a suite of geochemical and sedimentological proxies in combination with age-constrained, shallow acoustic reflection data to demonstrate that these underutilized coastal sediment archives are capable of generating high-resolution paleoclimate records on par with other terrestrial climate archives (i.e. lake sediments, ice cores, tree rings) and provides the first ~1650-year long record of climate variability from the inner shelf of the Alaskan Beaufort Sea. An analysis of sedimentation patterns within Simpson Lagoon using CHIRP seismic data and radioisotope geochronology reveals that sediment infilling in Simpson Lagoon began ~3500 y BP, creating a primary depocenter with mm y−1 sediment accumulation in western Simpson Lagoon. The interbedded sediments suggest that major sediment reworking from ice processes, a common occurrence in Arctic shelf environments, does not disrupt the sediment archive contained within the lagoon. Quantitative reconstructions of surface air temperature are obtained using the brGDGT-derived MBT'/CBT paleothermometer. A comprehensive study of lagoon and river sediments and catchment soils demonstrate that brGDGTs are primarily soil-derived, and yield reconstructed temperatures consistent with instrumental summer temperature observations from Alaska's North Slope. Temperature reconstructions from Simpson Lagoon also show similarities with regional and pan-Arctic climate records over the last few millennia, with evidence of temperature departures correlative with noted climate events (i.e., Little Ice Age, Medieval Climate Anomaly). In addition, temporal variability in sediment sourcing to the lagoon, determined using a multi-proxy approach (i.e., granulometry, elemental analysis, clay mineralogy), broadly corresponds with temperature fluctuations, indicating relative increases in fluvial sediment discharge during colder intervals and decreased river discharge/increased coastal erosion during warmer periods. This paleoclimate variability may be driven by variations in solar output and/or shifts in the regional ocean-atmosphere circulation patterns (e.g., the Aleutian Low).
Book Synopsis Holocene Glacial Variability Recorded in Lake Sediments from Nevado Huaguruncho, Peru by : Christopher M. Sedlak
Download or read book Holocene Glacial Variability Recorded in Lake Sediments from Nevado Huaguruncho, Peru written by Christopher M. Sedlak and published by . This book was released on 2012 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Glaciers and lakes are recorders of high altitude climate changes, and these archives are important in our understanding of past global changes. This study aims to provide further insight into how temperature and precipitation varied in the past, and combined to drive glacial variability in the tropical Andes of South America. A percussion core was taken in the field at Lake Yanacocha located in the watershed of Nevado Huaguruncho, Peru. Bulk density was measured along the profile of core and the chronology was determined by measuring radiocarbon on macrofossil samples within the sediments. The core geochemistry was analyzed using scanning X-Ray Fluorescence (XRF), Inductively Coupled Plasma Mass Spectrometry (ICP-MS), and coulometry. Changes in clastic sediment concentrations in the Yanacocha sediment core are represented by shifting values of Ti, K, bulk density, organic carbon, and residual flux. High clastic sediment values characterize the early Holocene, followed by low values during most of the early stages of the mid-Holocene, at a time the lake sediments suggest there was a period of more arid conditions. There is a notable increase in clastic sediments starting at the end of the mid-Holocene, and again during the late Holocene. This study, when paired with other similar research, further improves our knowledge of the timing and causes of climate variability in the tropical Andes, and suggests that glaciers during the Holocene advanced at times of both colder and wetter conditions.
Book Synopsis Holocene Environmental Variability Inferred from Lake Diatoms and Sediment Geochemistry in Northeastern Siberia, Russia by : Boris K. Biskaborn
Download or read book Holocene Environmental Variability Inferred from Lake Diatoms and Sediment Geochemistry in Northeastern Siberia, Russia written by Boris K. Biskaborn and published by . This book was released on 2012 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Late Glacial and Holocene Environmental Change Inferred from Sedimentary Archives of Kusawa Lake, Boundary Range Mountains, Yukon Territory, Canada by : Nicole A. Chow
Download or read book Late Glacial and Holocene Environmental Change Inferred from Sedimentary Archives of Kusawa Lake, Boundary Range Mountains, Yukon Territory, Canada written by Nicole A. Chow and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Late Holocene Oxygen Isotope Record of Hydroclimate Variability in Nicaragua from Lake Asososca by : Stephen Perdziola
Download or read book Late Holocene Oxygen Isotope Record of Hydroclimate Variability in Nicaragua from Lake Asososca written by Stephen Perdziola and published by . This book was released on 2018 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigation of hydroclimate requires a higher level of spatial and temporal detail than what currently exists for Central America. High resolution lake sediment archives are critical to gaining a more complete understanding of late Holocene climate variability in the region. The climate of Central America is influenced by both tropical Atlantic and Pacific Ocean-atmosphere processes. A better understanding of how these processes have impacted regional hydroclimate is important as it will enable more accurate predictions of future climate changes associated with shifting conditions in a drought sensitive region. Here a 1,000-year carbonate oxygen isotope record is presented from Lake Asososca, located in western Nicaragua. In this record, high delta 18O values indicate drier conditions, while lower ?18O values indicate drier conditions. My data indicate wet conditions at the start of the Medieval Climate Anomaly (MCA) and a trend towards drier conditions until A.D. 1200. The transitional period between the MCA and the Little Ice Age (LIA) from A.D. 1200 - 1400 experienced a shift towards wetter conditions. The LIA from A.D. 1400 -- 1850 was a period of variable conditions. My record indicates a shift from wet to dry conditions from A.D. 1400 - 1600. A pronounced period of wetter conditions occurred from A.D. 1650-1700 during the Maunder Minimum solar event. From A.D 1700 -- 1800 the record indicates variable conditions that alternated between shifts towards dry and wet. After the LIA, the record indicates a trend towards drier conditions. The El Nino Southern Oscillation (ENSO), the North American Oscillation (NAO), and the Atlantic Multidecadal Oscillation (AMO), were often temporally correlated with the Lake Asososca record and suggest that these modes have impacted regional hydroclimate over the late Holocene. Correspondence between the Lake Asososca record and solar variability highlight a potential linkage. Climate models indicate that the Atlantic Meridional Overturning Circulation responds to changes in solar variability and can have impacts on Atlantic SSTs, and therefore may be provide a mechanism to amplify changes in solar variability to Central American hydroclimate. Comparison of the Lake Asososca delta18O record to regional hydroclimate proxies across show little correspondence over the past millennium. While some similarities exist between the Lake Asososca record and other regional proxies, the lack of a coherent hydroclimate signal over the late Holocene suggests temporally and spatially variability hydroclimate shifts. More hydroclimate reconstructions and modelling studies need to be performed in order to fully resolve hydroclimate variability in Central America over the past millennium. This record adds to the network of regional paleoclimate reconstructions in Central America and indicates that modes of variability in both the Atlantic and Pacific Ocean basins have impacted regional hydroclimate over the past millennium.
Author :Dieter Mueller-Dombois Publisher :Springer Science & Business Media ISBN 13 :1441986863 Total Pages :905 pages Book Rating :4.4/5 (419 download)
Book Synopsis Vegetation of the Tropical Pacific Islands by : Dieter Mueller-Dombois
Download or read book Vegetation of the Tropical Pacific Islands written by Dieter Mueller-Dombois and published by Springer Science & Business Media. This book was released on 2013-11-26 with total page 905 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the leading authorities on the plant diversity and ecology of the Pacific islands, this book is a magisterial synthesis of the vegetation and landscapes of the islands of the Pacific Ocean. It is organized by island group, and includes information on geography, geology, phytogeographic relationships, and human influences on vegetation. Vegetation of the Tropical Pacific Islands features over 400 color photographs, plus dozens of maps and climate diagrams. The authors’ efforts in assembling the existing information into an integrated, comprehensive book will be welcomed by biogeographers, plant ecologists, conservation biologists, and all scientists with an interest in island biology.
Book Synopsis Quaternary Vegetation Dynamics by : Jürgen Runge
Download or read book Quaternary Vegetation Dynamics written by Jürgen Runge and published by CRC Press. This book was released on 2021-11-28 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book celebrates the relaunch of the African Pollen Database, presents state-of-the-art of modern and ancient pollen data from sub-Saharan Africa, and promotes Open Access science. Pollen grains are powerful tools for the study of past vegetation dynamics because they preserve well within sedimentary deposits and have a huge diversity in ornamentation that allows different taxa to be determined. The reconstruction of past vegetation from the examination of ancient pollen records thus can be used to characterize the nature of past landscapes (e.g. abundance of forests vs. grasslands), provide insights into changes in biodiversity, and gain empirical evidence of vegetation response to climatic change and human activity. In this, the 35th Volume of "Palaeoecology of Africa", we bring together new data and extensive synthetic reviews to provide novel insights into the relationships between human evolution, human activity, climate change and vegetation dynamics during the Quaternary, the last 2.6 million years. Current and ongoing climate and land-use change is exerting pressure on modern vegetation formations and threatening the livelihoods and wellbeing of many peoples in Africa. In this book the focus is on the Quaternary because it is during this geological period that the modern vegetation formations developed into their current configurations against a backdrop of high magnitude global climate change (glacial-interglacial cycles), human evolution, and a growing human land-use footprint. In this book the latest information is presented and collated from around the African continent to parameterize past vegetation states, identify the drivers of vegetation change, and assess the vegetation resilience to change. To achieve this research from two broad themes are covered: (i) the present is the key to the past (i.e. studies which improve our understanding of modern environments so that we can better interpret evidence from the past), and (ii) the past is the key to the future (i.e. studies which unlock information on how and why vegetation changed in the past so one can better anticipate trajectories of future change). This Open Access book will provide a strong foundation for future research exploring past ecological, environmental and climatic change within Africa and the surrounding islands. The book is organized regionally (covering western, eastern, central, and southern Africa) and it contains specialized articles focused on particular topics (such as modern pollen-vegetation relationships and fire as a driver of vegetation change), as well as regional and pan-African syntheses drawing together decades of research to assess key scientific questions (including the role of climate in driving vegetation change and the role of vegetation change in human evolution). These articles will be useful to students and teachers from high school to the highest level of university who are interested in the origins and dynamics of vegetation in Africa. Furthermore, it is also meant to provide societally relevant information that can act as an inspiration for the development of sustainable management practices for the future.
Book Synopsis Organic Geochemistry by : Geoffrey Eglinton
Download or read book Organic Geochemistry written by Geoffrey Eglinton and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt: For many years, the subject matter encompassed by the title of this book was largely limited to those who were interested in the two most economically important organic materials found buried in the Earth, namely, coal and petroleum. The point of view of any discussions which might occur, either in scientific meetings or in books that have been written, was, therefore, dominated largely by these interests. A great change has occurred in the last decade. This change had as its prime mover our growing knowledge of the molecular architecture of biological systems which, in turn, gave rise to a more legitimate asking of the question: "How did life come to be on the surface of the Earth?" A second motivation arose when the possibilities for the exploration of planets other than the Earth-the moon, Mars, and other parts of the solar system-became a reality. Thus the question of the possible existence of life elsewhere than on Earth conceivably could be answered.
Book Synopsis A Directory of Wetlands in Oceania by : Derek A. Scott
Download or read book A Directory of Wetlands in Oceania written by Derek A. Scott and published by . This book was released on 1993 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Plant-Animal Interactions by : Kleber Del-Claro
Download or read book Plant-Animal Interactions written by Kleber Del-Claro and published by Springer Nature. This book was released on 2021-06-04 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides the first overview of plant-animal interactions for twenty years focused on the needs of students and professors. It discusses a range of topics from the basic structures of plant-animal interactions to their evolutionary implications in producing and maintaining biodiversity. It also highlights innovative aspects of plant-animal interactions that can represent highly productive research avenues, making it a valuable resource for anyone interested in a future career in ecology. Written by leading experts, and employing a variety of didactic tools, the book is useful for students and teachers involved in advanced undergraduate and graduate courses addressing areas such as herbivory, trophic relationships, plant defense, pollination and biodiversity.
Book Synopsis The Fly River, Papua New Guinea by : Barrie R. Bolton
Download or read book The Fly River, Papua New Guinea written by Barrie R. Bolton and published by Elsevier. This book was released on 2009-01-09 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1984 the OK Tedi Mining Company Limited began mining copper and gold mineralization from Mt. Fubilan, which is located at the headwaters of the OK Tedi. Subsequent mining in the region followed in 1990. Since this time there has been intense monitoring of the environment undertaken by those in the field in order to better understand the possible impact of mining. This book assembles and summarizes research spanning two decades undertaken by leading experts with firsthand experience. Much of this research is contained in internal company reports, giving the reader rare insight and firsthand knowledge. Documents physical and biologic change in a large tropical river system brought about largely by mining in an otherwise pristine environment This book brings together a broad rand of disciplines to provide a comprehensive overview of change in a complex and dynamical tropical river system based largely on previously unpublished company reports The book provides examples of state-of-the-art strategies and methodologies for monitoring environmental impact in a large river system
Book Synopsis New Guinea and Nearby Islands by : United States. Hydrographic Office
Download or read book New Guinea and Nearby Islands written by United States. Hydrographic Office and published by . This book was released on 1944 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Land Use Change and Sustainability by : Seth Appiah-Opoku
Download or read book Land Use Change and Sustainability written by Seth Appiah-Opoku and published by BoD – Books on Demand. This book was released on 2020-02-26 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses aspects of land use change and sustainability in ways that may generate further research ideas. It brings together discussions from leading researchers and scholars in the field of land use change and sustainability from five different countries including the USA, Ethiopia, Guyana, Taiwan, and Indonesia. Based on empirical research and case studies, the book is divided into two sections. The first section is subdivided into four chapters and discusses land use sustainability in the Northern Great Plains of the USA; effects of rural land use and tenure on sustainable management of mangroves in Corentyne, Guyana; the property formation process in peri-urban areas of Ethiopia; and the effects of green energy production on farmlands in the Yulin County of Taiwan. The second section of the book is subdivided into two chapters and discusses cases pertaining to land use mapping and sustainability including land cover/land use mapping using soft computing techniques with optimized features; and applying systems analysis to evaluate Jelutung as option for sustainable use of peat lands in Central Kalimantan, Indonesia. The book is insightful, thought provoking, concise, and easy to understand. It could serve as an important reference material on land use change and sustainability.
