Lake Records Of Environmental And Climate Change On The Tibetan Plateau
DOWNLOAD
Download Lake Records Of Environmental And Climate Change On The Tibetan Plateau PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Lake Records Of Environmental And Climate Change On The Tibetan Plateau book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Lake Records Of Environmental And Climate Change On The Tibetan Plateau
DOWNLOAD
Author : Zhang Chengjun
language : en
Publisher: Frontiers Media SA
Release Date : 2022-11-07
Lake Records Of Environmental And Climate Change On The Tibetan Plateau written by Zhang Chengjun and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-11-07 with Science categories.
Reconstructing Climate Variability On The Tibetan Plateau
DOWNLOAD
Author : Juliane Wischnewski
language : en
Publisher:
Release Date : 2010
Reconstructing Climate Variability On The Tibetan Plateau written by Juliane Wischnewski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Spatial and temporal temperature and moisture patterns across the Tibetan Plateau are very complex. The onset and magnitude of the Holocene climate optimum in the Asian monsoon realm, in particular, is a subject of considerable debate as this time period is often used as an analogue for recent global warming. In the light of contradictory inferences regarding past climate and environmental change on the Tibetan Plateau, I have attempted to explain mismatches in the timing and magnitude of change. Therefore, I analysed the temporal variation of fossil pollen and diatom spectra and the geochemical record from palaeo-ecological records covering different time scales (late Quaternary and the last 200 years) from two core regions in the NE and SE Tibetan Plateau. For interpretation purposes I combined my data with other available palaeo-ecological data to set up corresponding aquatic and terrestrial proxy data sets of two lake pairs and two sets of sites. I focused on the direct comparison of proxies representing lacustrine response to climate signals (e.g., diatoms, ostracods, geochemical record) and proxies representing changes in the terrestrial environment (i.e., terrestrial pollen), in order to asses whether the lake and its catchments respond at similar times and magnitudes to environmental changes. Therefore, I introduced the established numerical technique procrustes rotation as a new approach in palaeoecology to quantitatively compare raw data of any two sedimentary records of interest in order to assess their degree of concordance. Focusing on the late Quaternary, sediment cores from two lakes (Kuhai Lake 35.3ʻN; 99.2ʻE; 4150 m asl; and Koucha Lake 34.0ʻN; 97.2ʻE; 4540 m asl) on the semi-arid northeastern Tibetan Plateau were analysed to identify post-glacial vegetation and environmental changes, and to investigate the responses of lake ecosystems to such changes. Based on the pollen record, five major vegetation and climate changes could be identified: (1) A shift from alpine desert to alpine steppe indicates a change from cold, dry conditions to warmer and more moist conditions at 14.8 cal. ka BP, (2) alpine steppe with tundra elements points to conditions of higher effective moisture and a stepwise warming climate at 13.6 cal. ka BP, (3) the appearance of high-alpine meadow vegetation indicates a further change towards increased moisture, but with colder temperatures, at 7.0 cal. ka BP, (4) the reoccurrence of alpine steppe with desert elements suggests a return to a significantly colder and drier phase at 6.3 cal. ka BP, and (5) the establishment of alpine steppe-meadow vegetation indicates a change back to relatively moist conditions at 2.2 cal. ka BP. To place the reconstructed climate inferences from the NE Tibetan Plateau into the context of Holocene moisture evolution across the Tibetan Plateau, I applied a five-scale moisture index and average link clustering to all available continuous pollen and non-pollen palaeoclimate records from the Tibetan Plateau, in an attempt to detect coherent regional and temporal patterns of moisture evolution on the Plateau. However, no common temporal or spatial pattern of moisture evolution during the Holocene could be detected, which can be assigned to the complex responses of different proxies to environmental changes in an already very heterogeneous mountain landscape, where minor differences in elevation can result in marked variations in microenvironments. Focusing on the past 200 years, I analysed the sedimentary records (LC6 Lake 29.5ʻN, 94.3ʻE, 4132 m asl; and Wuxu Lake 29.9ʻN, 101.1ʻE, 3705 m asl) from the southeastern Tibetan Plateau. I found that despite presumed significant temperature increases over that period, pollen and diatom records from the SE Tibetan Plateau reveal only very subtle changes throughout their profiles. The compositional species turnover investigated over the last 200 years appears relatively low in comparison to the species reorganisations during the Holocene. The results indicate that climatically induced ecological thresholds are not yet crossed, but that human activity has an increasing influence, particularly on the terrestrial ecosystem. Forest clearances and reforestation have not caused forest decline in our study area, but a conversion of natural forests to semi-natural secondary forests. The results from the numerical proxy comparison of the two sets of two pairs of Tibetan lakes indicate that the use of different proxies and the work with palaeo-ecological records from different lake types can cause deviant stories of inferred change. Irrespective of the timescale (Holocene or last 200 years) or region (SE or NE Tibetan Plateau) analysed, the agreement in terms of the direction, timing, and magnitude of change between the corresponding terrestrial data sets is generally better than the match between the corresponding lacustrine data sets, suggesting that lacustrine proxies may partly be influenced by in-lake or local catchment processes whereas the terrestrial proxy reflects a more regional climatic signal. The current disaccord on coherent temporal and spatial climate patterns on the Tibetan Plateau can partly be ascribed to the complexity of proxy response and lake systems on the Tibetan Plateau. Therefore, a multi-proxy, multi-site approach is important in order to gain a reliable climate interpretation for the complex mountain landscape of the Tibetan Plateau.
Ostracods As Indicators For Climatic And Environmental Changes On The Tibetan Plateau
DOWNLOAD
Author : Mauro Alivernini
language : de
Publisher:
Release Date : 2019*
Ostracods As Indicators For Climatic And Environmental Changes On The Tibetan Plateau written by Mauro Alivernini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019* with categories.
The Tibetan Plateau is a vast and elevated plateau in Central Asia and is a source area of the most important rivers of China, India and Indochina, providing water to billions people. In this context, reliable predictions about the evolution of water supply from lacustrine and river systems are valuable to ensure freshwater availability and environmental disaster prevention, especially in time of global warming. For this proposal, organisms that provide a proxy record are particularly valuable. Analysis on ostracods from water bodies of the Tibetan Plateau and palaeoenvironmental records provide the basis to assess the environmental and societal impact of recent global change on the Tibetan Plateau. This study wants to contribute to a better understanding and thus improving the ostracods as indicators for the environmental and social impact of Quaternary and recent global change on the Tibetan Plateau. The analyses were conducted on the Taro Co and Tangra Yumco lake systems, to detect (palaeo)environmental changes and to assess their lake level changes evolution. To compare the obtained results with published records from other lakes, the considered transect was extended with information from articles regarding several water bodies present in different regions of the southern Tibetan Plateau. In the time frame after 18 ka, where more information are available, our results corresponds with only some time-shift, probably due to different dating or different exposure to the Indian Monsoon and the Westerlies although the lacking of information on tectonic and climate models will be needed to assess the different influence of the circulation patterns for the single lakes. In addition of this, the ostracod associations of the Zhada Basin (western Tibetan Plateau) were carried out and, aiming to a future use of ostracods for this less studied sector, a documentation of several unknown species was performed. A new species, Leucocytherella dangeloi was described.
A Carbon And Oxygen Isotope Record Of Recent Environmental Change From Qinghai Lake Ne Tibetan Plateau
DOWNLOAD
Author : A C G. Henderson
language : en
Publisher:
Release Date : 2003
A Carbon And Oxygen Isotope Record Of Recent Environmental Change From Qinghai Lake Ne Tibetan Plateau written by A C G. Henderson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Mountain Geoecology And Sustainable Development Of The Tibetan Plateau
DOWNLOAD
Author : Du Zheng
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Mountain Geoecology And Sustainable Development Of The Tibetan Plateau written by Du Zheng and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Intense uplift of the Tibetan Plateau in Late Cenozoic Era is one of the most important events in geological history of the Earth. The plateau offers an ideal region for studying of lithospheric formation and evolution, probing into the mechanism of crustal movement, and understanding of changes in environments and geo-ecosystems in Asia. Intense uplift ofthe plateau resulted in drastic changes of natural environment and apparent regional differentiation on the plateau proper and neighboring regions. The plateau therefore becomes a sensitive area of climate change in Asian monsoon region, which is closely related to the global change. As a special physical unit, its ecosystems occupy a prominent position in the world. Due to its extremely high elevation and great extent, natural types and characteristics of physical landscapes on the plateau are quite different from those in lowlands at comparable latitudes, and environments are also different from those in high latitudinal zones. Consequently, the Tibetan Plateau has been classified as one of three giant physical regions in China and considered as a unique unit on Earth. Scientific surveys and expeditions to the Tibetan Plateau on large scale began from 1950's. Amongst them, a number of comprehensive scientific expeditions to the Xizang (Tibet) Autonomous Region, Hengduan Mts. areas, Karakorum and Kunlun Mts. regions, as well as the Hoh Xii Mts. areas, have been successively carried out by the Integrated Scientific Expedition to Tibetan Plateau, sponsored by Chinese Academy of Sciences since 1973.
Late Quaternary Hydrological Paleoenvironmental And Geomorphological Processes In The Tibetan Plateau And Its Adjacent Areas
DOWNLOAD
Author : Xiangjun Liu
language : en
Publisher: Frontiers Media SA
Release Date : 2022-02-23
Late Quaternary Hydrological Paleoenvironmental And Geomorphological Processes In The Tibetan Plateau And Its Adjacent Areas written by Xiangjun Liu and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-23 with Science categories.
Late Cenozoic Climate Change In Asia
DOWNLOAD
Author : Zhisheng An
language : en
Publisher: Springer Science & Business Media
Release Date : 2014-03-24
Late Cenozoic Climate Change In Asia written by Zhisheng An and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-03-24 with Science categories.
This book is the first of its kind on environmental change research devoted to monsoon-arid environment evolution history and its mechanism involved. Capturing the most prominent features of Asian climate and environmental changes, it gives a comprehensive review of the Asian Monsoon records providing evidence for spatial and temporal climatic and environmental changes across the Asian continent since the Late Cenozoic. The dynamics underlying these changes are explored based on various bio-geological records and in particular based on the evidence of loess, speleothems as well as on mammal fossils. The Asian monsoon-arid climate system which quantifies the controlling mechanisms of climate change and the way it operates in different time scales is described. Attempts to differentiate between natural change and human-induced effects, which will help guide policies and countermeasures designed to support sustainable development on the Chinese Loess Plateau and the arid west.
Quaternary Deserts And Climatic Change
DOWNLOAD
Author : A.S. Alsharhan
language : en
Publisher: CRC Press
Release Date : 2020-08-26
Quaternary Deserts And Climatic Change written by A.S. Alsharhan and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-08-26 with Science categories.
These proceedings record the results of climate change in many areas which are hyper-arid deserts today but which, almost cyclically, at intervals of thousands or even hundreds of thousands of years, have had a much more humid climate.
Earth Surface Processes And Environmental Changes In East Asia
DOWNLOAD
Author : Kenji Kashiwaya
language : en
Publisher: Springer
Release Date : 2015-06-11
Earth Surface Processes And Environmental Changes In East Asia written by Kenji Kashiwaya and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-11 with Science categories.
This book examines relationships between climate-hydrological changes and other phenomena including land use and natural disasters during the Holocene and recent past. In particular, periods of rapid climatic shifts such as global warming and global cooling are examined through paleohydrological and other studies of various lake-catchment systems in East Asia, from Mongolia in the north to Taiwan in the south. A number of different research techniques are used in the work presented here, including sediment analysis and optically stimulated luminescence dating and the reader learns how the lake-catchment system functions as a “proxy observatory” for past and present environmental monitoring. The lake catchments studied by the authors of this volume are under similar climatic conditions, i.e., under the East Asia monsoon, with some systematic difference in climatic factors. Both proxy and observation data are available for the surrounding countries’ provisions against natural disasters that are related to climate-hydrological events and readers will see how present instrumental observation data can be connected to past proxy data (sediment information) in the system.
Ostracoda As Proxies For Quaternary Climate Change
DOWNLOAD
Author :
language : en
Publisher: Newnes
Release Date : 2012-12-31
Ostracoda As Proxies For Quaternary Climate Change written by and has been published by Newnes this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-31 with Science categories.
Ostracod crustaceans, common microfossils in marine and freshwater sedimentary records, supply evidence of past climatic conditions via indicator species, transfer function and mutual climatic range approaches as well as the trace element and stable isotope geochemistry of their shells. As methods of using ostracods as Quaternary palaeoclimate proxies have developed, so too has a critical awareness of their complexities, potential and limitations. This book combines up-to-date reviews (covering previous work and summarising the state of the art) with presentations of new, cutting-edge science (data and interpretations as well as methodological developments) to form a major reference work that will constitute a durable bench-mark in the science of Ostracoda and Quaternary climate change. In-depth and focused treatment of palaeoclimate applications Provides durable benchmark and guide for all future work on ostracods Presents new, cutting-edge science