Download or read book Holocene Climate Variability Based on Two Lacustrine Sediment Sequences from C diz Southern Spain written by Jasmijn van 't Hoff and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holocene Climate Variability Based on Two Lacustrine Sediment Sequences from C diz Southern Spain written by Jasmijn van ́t Hoff and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Holocene Climate Variability as Preserved in High resolution Estuarine and Lacustrine Sediment Archives written by Jeremiah Bradford Hubeny and published by . This book was released on 2006 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holocene Climate Change from Fjord and Lake Sediment Core and Seismic Records in Southern Patagonia written by Sverre Liv LeRoy and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Pleistocene Holocene Sedimentary Processes at the Active Margin of South Central Chile written by Susanne Stefer and published by . This book was released on 2009 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Holocene Climate Variability from Northern Gulf of Mexico Sediments written by Julie N. Richey and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Accurate reconstruction of natural climate variability over the past millennium is critical for predicting responses to future climate change. In order to improve on current understanding of climate variability in the sub-tropical North Atlantic region over the past millennium, a rigorous study of Gulf of Mexico (GOM) sea surface temperature (SST) variability was conducted using both inorganic (foraminiferal Mg/Ca) and molecular organic (TEX6) geochemical proxies. In addition to generating multiple high-resolution climate records, the uncertainties of the SST proxies are rigorously assessed. There are 3 major research questions addressed: (1) What was the magnitude of GOM SST variability during the past 1,000 years, particularly during large-scale climate events such as the Little Ice Age (LIA) and the Medieval Warm Period (MWP). (2) Is the SST signal reproducible within the same sediment core, among different northern GOM basins, and using different geochemical SST proxies? (3) What are the ecological controls on the paleothermometers used to reconstruct SST variability in the GOM? Can differences in the ecology (i.e. seasonal distribution, depth habitat, etc.) of distinct paleothermometers be exploited to gain insight into changes in upper water column structure or seasonality in the GOM during the LIA and MWP? The major findings include: (1) The magnitude of temperature variability in the GOM over the past millennium is much larger than that estimated from Northern Hemisphere temperature reconstructions. The MWP (1400-900 yrs BP) was characterized by SSTs in the GOM that were similar to the modern SST, while the LIA (400-150 yrs BP) was marked by a series of multidecadal intervals that were 2-2.5°C cooler than modern. (2) This LIA cooling was replicated in the Mg/Ca-SST records from three different well-dated northern GOM basins (Pigmy, Garrison and Fisk Basins), as well as in two different geochemical proxies. (3) It is determined that foraminiferal test size has a significant effect on shell geochemistry. Using core-top calibration, discrepancies in the seasonal/depth habitats between different planktonic Foraminifera, and between Foraminifera and Crenarchaeota are inferred. Downcore differences are used to make inferences about changes in GOM mixed layer depth and seasonality over the past millennium.
Download or read book Holocene Climate Variability written by E. Jansen and published by Elsevier Science & Technology. This book was released on 2004 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an update of results on the record of past ocean variability since the end of the ice age. This work gives an overview of many aspects of natural climate variability and give both scholars and students a means of keeping up to date on recent developments in the field.
Download or read book Holocene environmental change in a marine estuarine lacustrine sediment sequence King George Island South Shetland Islands written by J.C. MARTINEZ MACCHIAVELLO and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holocene Climate Variability in Hispaniola written by Elizabeth Marie MacLennan and published by . This book was released on 2019 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laguna Saladilla (19.656 N, 71.715 W) is a large (220 ha) freshwater lake located near sea level on the north coast of Hispaniola, 2 km south of Monte Cristi National Park in the Dominican Republic, and 1 km east of the international border with Haiti. Results of prior analyses of pollen, microscopic charcoal, mollusk shells, and diatoms in an 8.5-m sediment core from the lake were interpreted to largely indicate shifts in salinity and water depth attributed to relative sea level rise over the middle and late Holocene (Caffrey et al., Paleogeography, Paleoecology, Paleoclimatology 436: 9-32, 2015). Mollusk assemblages indicated saline conditions at 7650 cal yr BP, when sediments contained abundant red mangrove pollen, but freshening over the late Holocene, with the lake becoming brackish at 3500 cal yr BP and transitioning ca. 2500 cal yr BP to its current freshwater condition. Increased charcoal abundance and higher percentages of Amaranthaceae pollen after 2500 cal yr BP indicate increased fires and generally dry climate in coastal north Hispaniola, but detailed climate reconstruction was not possible from the proxies examined. To develop a precipitation record for north coastal Hispaniola, I examined compound-specific hydrogen isotopes in 39 samples covering the last ca. 1700 years at Laguna Saladilla. I also analyzed hydrogen isotopes in samples of bulk sediment covering this same period. Results provided evidence of increased aridity and evapotranspiration/precipitation ratios during the time known as the Terminal Classic Drought. Results complement and extend prior proxy analyses, illustrating the benefits of hydrogen isotopes in the reconstruction of paleoenvironments. My research also tested the correlation of sedimentary bulk hydrogen to compound-specific hydrogen isotopes, showing that bulk hydrogen isotopes did not respond the same controls as the compound-specific record at this site. The correlation of bulk hydrogen isotopes to other proxies at Laguna Saladilla, however, suggest that it is still a useful proxy for understanding past environments. This research extends upon the work of multiple studies to reconstruct climate changes during the Terminal Classic Drought in the circum-Caribbean region.
Download or read book Glacial to Holocene Climate Variability in the Southern Mid Latitudes written by Natallia Piatrunia and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigating late Holocene climate variability in central Mexico using carbon isotope ratios in organic materials and oxygen isotope ratios from diatom silica within lacustrine sediments written by M.J. Leng and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holocene Climate and Environmental Variability in NE Germany Inferred from Annually Laminated Lake Sediments written by Nadine Dräger and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the role of natural climate variability under the pressure of human induced changes of climate and landscapes, is crucial to improve future projections and adaption strategies. This doctoral thesis aims to reconstruct Holocene climate and environmental changes in NE Germany based on annually laminated lake sediments. The work contributes to the ICLEA project (Integrated CLimate and Landscape Evolution Analyses). ICLEA intends to compare multiple high-resolution proxy records with independent chronologies from the N central European lowlands, in order to disentangle the impact of climate change and human land use on landscape development during the Lateglacial and Holocene. In this respect, two study sites in NE Germany are investigated in this doctoral project, Lake Tiefer See and palaeolake Wukenfurche. While both sediment records are studied with a combination of high-resolution sediment microfacies and geochemical analyses (e.g. μ-XRF, carbon geochemistry and stable isotopes), detailed proxy understanding mainly focus
Download or read book Holocene Climate Variability written by Christian Grob and published by . This book was released on 2009 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Holocene Climate Variability in the North Atlantic Based on Biomarker Reconstruction written by María Jesús Rubio de Inglés and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holocene Cycles written by Charles W. Finkl and published by . This book was released on 1995 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High resolution Reconstruction of Glacial to Holocene Climate Variability from Sediments of the Cariaco Basin and Arabian Sea written by Gaudenz Deplazes and published by . This book was released on 2012 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mountain Lake Sedimentary Biomarker Records as Indicators of Holocene Climate Variability written by Julie Anne Scott and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
