Download or read book Late Quaternary Climate and Sedimentary History Derived from N alkanes Alkenones and Bulk Organic Carbon Analyses in Fujian Coast China written by 李瀟云 and published by . This book was released on 2014 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Late Quaternary Climate and Sedimentary History Derived from N Alkanes Alkenones and Bulk Organic Carbon Analyses in Fujian Coast China written by Xiaoyun Li and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Late Quaternary Climate and Sedimentary History Derived From N-alkanes, Alkenones and Bulk Organic Carbon Analyses in Fujian Coast, China" by Xiaoyun, Li, 李瀟云, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Late Quaternary is an important period for paleoclimate study due to the boom of human civilization and thus its influence on climate conditions of the present interglacial period. In this study, a 52 m long borehole was drilled in a coastal embayment of Fujian, China, within which a thick marine layer from 16.05 to 32.60 m is found. Bulk organic geochemical analyses, containing total organic carbon content (TOC), carbon isotope ratio (δ13C), alkenones and n-alkanes, were analyzed for the whole core. Organic carbon isotope ratios (δ13C) of the sediment layers vary between -22.10/00 and -32.90/00, with higher values in the two marine sequences and lower in the two aquatic sequences. In the thick marine sequence, the δ13C is relatively stable, and it becomes gradually enriched from the base upwards and depleted rapidly at the top, indicating a full cycle of marine transgression and regression. The n-alkanes exhibit a similar trend, with several indexes, i.e., maximum concentration (Cmax), carbon preference index (CPI), average chain length (ACL), terrestrial-aquatic ratio (TAR), Paq and C31/(C29]C31). These results suggest the control of EAM and sea-level change in the sedimentary processes. Analysis on alkenones shows sea surface temperature (SST) variations as well as sea-level oscillations in the study site. DOI: 10.5353/th_b5351040 Subjects: Paleoclimatology - Quaternary Sedimentation and deposition - China - Min River (Fujian Sheng) Paleoclimatology - China - Fujing Sheng

Download or read book Late Quaternary Climate Change and Human Adaptation in Arid China written by D.B. Madsen and published by Elsevier. This book was released on 2011-09-22 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to political pressures, prior to the 1990s little was known about the nature of human foraging adaptations in the deserts, grasslands, and mountains of north western China during the last glacial period. Even less was known about the transition to agriculture that followed. Now open to foreign visitation, there is now an increasing understanding of the foraging strategies which led both to the development of millet agriculture and to the utilization of the extreme environments of the Tibetan Plateau. This text explores the transition from the foraging societies of the Late Paleolithic to the emergence of settled farming societies and the emergent pastoralism of the middle Neolithic striving to help answer the diverse and numerous questions of this critical transitional period.* Examines the transition from foraging societies of the Late Paleolithic to the emergence of settled farming societies and the emergent pastoralism of the middle Neolithic* Explores explanatory models for the links between climate change and cultural change that may have influenced the development of millet agriculture* Reviews the relationship between climate change and population expansions and contraditions during the late Quaternary

Download or read book Organic Carbon Signatures of the Middle late Quaternary Lacustrine History of Tropical South China written by 王宁 and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Responses of Regional Sedimentary Archives to Late Quaternary Climate Change written by Jingran Zhang 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 Responses of Late Quaternary Sediments to Climate Change written by Jingran Zhang 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 Quaternary Geology and Environment of China written by Dongsheng Liu and published by Springer. This book was released on 1985-08 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Late Quaternary Climate and Environmental Variability Inferred from Terrigenous Sediment Records in China and the North Pacific Bering Sea written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Late Quaternary Sea level Changes written by Yunshan Qin and published by . This book was released on 1987 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Organic Carbon Cycling in East China Sea Shelf Sediments written by Xinxin Li and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Changjiang River provides the main source of sediment and terrestrial derived organic carbon (OC) to the Changjiang large delta-front estuary (LDE) in the East China Sea (ECS). This study analyzed bulk OC, biomarkers including lignin and plant pigment, black carbon (BC) on ECS sediments sampled in winter 2009 and 2010 in order to study the OC cycling under the influence of natural and anthropogenic disturbance. Low-oxygen tolerant foraminiferal microfossils were analyzed in another two sediment cores to study the historical hypoxia events in the Changjiang LDE. Bulk carbon to nitrogen (C/N) ratio and stable isotope [lowercase delta]13C in the surface sediment samples indicated a mixture source of terrestrial, deltaic and marine derived OC. Refractory BC and reworked marine OC seemed to comprise most of the OC pool with older, less reactive signatures as deduced from [uppercase delta]14C, and BC analyses. Winter wind/wave energy and hydrodynamic sorting had a substantial winnowing effect on surface sediment OC redistribution. As a result, the highest lignin concentration shifted to the south during the 2010 cruise after the summer flood event. In addition, algal inputs from local deltaic lakes due to eutrophication and/or lateral transport likely caused the observed lack of benthic-pelagic coupling of pigment concentrations between the surface sediments and the water column after the summer flood in 2010. For the down-core sediment, the mass accumulation rate distribution followed the dispersal pathway of the ECS sediment. Terrestrial and marine derived OC showed significant spatial and temporal distribution. Lignin rich materials were better preserved in sediments closer to the coast while offshore sediments tended to be composed of lignin-poor, degraded OC, that were likely hydrodynamically sorted to a long distance during transport. Besides eutrophication, plant pigments indicated that marine-derived OC was mostly deposited in the sediment mixed layer with decay in the underlying sediment accumulation layer. The total OC standing stock since 1900 is approximately 1.62±1.15 kgC m−2, about 1/10 of the total OC stock in all the middle and lower lakes in the Changjiang catchment. There has been an increase in the number of hypoxic bottom water events on the Changjiang LDE over the past 60 yrs indicated from the increases in low-oxygen tolerant foraminiferal microfossils due to excess deposition of OC and summer stratification. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/149240

Download or read book Quaternary Coastline Changes in China written by Qin Yunshan and published by . This book was released on 1991 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Late Quaternary Climate Recorded in Chinese Loess written by Thomas Stevens and published by . This book was released on 2007 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Late Quaternary Sea Level Correlation and Applications written by Walter S. Newman and published by Springer. This book was released on 1989 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, Halifax, Canada, July 19-30, 1987

Download or read book Late Quaternary Climate Reconstruction Based on Lake Sediments and Cosmogenic Nuclides written by Raphael Gromig and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geology of the China Seas written by Pinxian Wang and published by Elsevier. This book was released on 2014-06-07 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geology of the China Seas represents the first English-language synthesis of the available research into the geology of the South and East China Seas. Among the marginal basins worldwide, these areas have been the focus of extensive research activities in the last three decades, and are now among the global hot spots in hydrocarbon explorations and scientific investigations. The region is experiencing rapid economic development with the offshore petroleum industry providing approximately one third of the domestic hydrocarbon production for mainland China. Gas hydrates have been successfully recovered from the China Seas for the first time. Over the years, many volumes on the geology of the China Seas have been published in Chinese. Although an increasing number of papers in English have appeared recently, the majority deal with local or regional paleo-environment and sedimentology, and are scattered in different journals. This book brings together this rich data in one resource, particularly that generated by Chinese marine geologists and petroleum geologists, and provides the very first synthesis of the geology off China. - The first systematic summary of the geology of the China Seas - Includes comprehensive coverage of the South China Sea and the East China Sea, including the Yellow Sea and Bohai Gulf - Reviews hundreds of Chinese publications on marine and petroleum geology not currently accessible to the international community

Download or read book Late Quaternary Climate Reconstruction Based on Lake Sediments and Cosmogenic Nuclides Examples from the Russian Arctic and the Balkan Peninsula written by Raphael Gromig and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Late Quaternary Environmental History of Taylor Valley written by Sabrina Ortlepp and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2010-03 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the unglaciated areas of Antarctica, lake sediments act as archives of the regional environmental and climatic history. In most cases, the records are restricted to the Holocene. Amongst the few exceptions are lakes in the McMurdo Dry Valleys, southern Victoria Land, which are known to have remained mostly ice-free during the Last Glacial Maximum. Within the scope of an U.S.-American-German expedition in austral summer 2002/2003, several sediment cores were recovered from three major lakes in the Taylor Valley: lakes Fryxell, Hoare, and Bonney. In order to reconstruct the late Quaternary regional environmental and climate history, sedimentological, biogeochemical, mineralogical, and chronological investigations were conducted on the sediment sequences recovered from Lake Hoare (core Lz1020) and East Lake Bonney (core Lz1023) within the scope of this thesis. This study shows that the investigated lake sediment records provide crucial information about the late Quaternary environmental history of Taylor Valley, but should be interpreted in context with ice core records, terrestrial, and marine archives for a better understanding of the regional paleoenvironment, and paleoclimate.