Download or read book Reconstruction of the Holocene Indian Monsoon Climate Variability Based on Biogeochemical Analyses of Lake Sediments written by Philip Menzel and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The studies presented in this thesis focus on the reconstruction of the Holocene Indian monsoon climate based on biogeochemical analyses on lake sediments. For example, the modern hydrological and biogeochemical properties of the central Indian Lonar Lake that was selected for the palao-climate reconstruction are investigated

Download or read book Holocene Climate Change and Environment written by Navnith Kumaran and published by Elsevier. This book was released on 2021-09-24 with total page 693 pages. Available in PDF, EPUB and Kindle. Book excerpt: Holocene Climate Change and Environment presents detailed, diverse case studies from a range of environmental and geological regions on the Indian subcontinent which occupies the central part of the monsoon domain. This book examines Holocene events at different time intervals based on a new, high-resolution, multi-proxy records (pollen, spores, NPP, diatoms, grain size characteristics, total organic carbon, carbon/nitrogen ratio, stable isotopes) and other physical tools from all regions of India. It also covers new facilities in chronological study and luminescence dating, which have added a new dimension toward understanding the Holocene glacial retreats evolution of coastal landforms, landscape dynamics and human evolution. Each chapter is presented with a unified structure for ease of access and application, including an introduction, geographic details, field work and sampling techniques, methods, results and discussion. This detailed examination of such an important region provides key insights in climate modeling and global prediction systems. - Provides data and research from environmentally and geologically diverse regions across the Indian subcontinent - Presents an integrated and interdisciplinary approach, including considerations of human impacts - Features detailed case studies that include methods and data, allowing for applications related to research and global modeling

Download or read book The Application of Lake Sediments for Climate Studies written by Praveen K. Mishra and published by Springer Nature. This book was released on 2023-10-01 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book discusses a comprehensive overview of various limnological approaches for climate studies, and sheds light on a multi-dimensional approach (i.e., field, laboratory, and data analysis; modern investigations; proxy development/calibration; proxy interpretation; and validation of climate models with proxy data) for climate reconstruction. The study highlighted the utilization of lake sediment as an archive for paleoclimate research. With the help of several case studies from around the globe (Israel, India, Turkey, Kyrgyzstan, Tibet, China and Europe), this brief provides a unique way to understand the implication of the methodological framework for climate studies. The book emphasizes the importance of field-based modern investigations to establish baseline characteristics of lake basins according to changes in environmental conditions. It also unveils the role of paleoclimate studies in climate model validation to forecast future climate variability. The book is a valuable resource for early career researchers interested in climate studies especially those using lake sediments as climate archive.

Download or read book Quaternary Climate Change over the Indian Subcontinent written by Neloy Khare and published by CRC Press. This book was released on 2021-05-27 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quaternary studies provide the essential context for evaluation of what is happening with the earth's climate today, and to clarify our vulnerability to hazardous natural processes. This book covers scientific aspects of past and present climatic changes of the quaternary period focused on the Indian subcontinent via response of modern environmental conditions on climate proxies, reconstruction of paleoclimate, paleomonsoon, glacial geology, climate variabilities using dendrochronology, cave deposits including quaternary tectonics and climate change over the Himalayan region. It consists of data generated from different landforms including lakes, caves, rivers, swamps, pits, and trenches using different proxies. Aimed at researchers, graduate students, professionals in geology, geography and environmental sciences, micropaleontology, and Quaternary climate change, this book: Studies Quaternary climate using various proxies in varied environments on the Indian sub-continent Covers pertinent historical and environmental archives to understand the current climate scenario Discusses the impact of climate change on biotic and abiotic components Includes thorough review of paleoclimate change studies Devotes significant space to glacial geology and all glacial climate proxies

Download or read book Holocene Climate Variability in the Mexican Monsoon Region written by Benjamin John Aston and published by . This book was released on 2008 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reconstructing Holocene Indian Summer Monsoon Variability Using High Resolution Sediments from the Southeastern Tibet written by Melanie Marie Perello and published by . This book was released on 2020 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Science Policies and Conflicts of Climate Change written by Neloy Khare and published by Springer Nature. This book was released on 2023-01-01 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of articles captures and disseminates contemporary perspectives on climate change from an Indian context. Starting with an argument on a new climate deal which highlights the importance of policies and regulations within the climate change debate, some of India’s best-known geologists, meteorologists, climate scientists and archaeologists have put forward their concerns and convictions in this collection. The book covers articles on climate change scenarios, impacts, policies, regulations and protocols as well as geopolitical and geoeconomics implications of climate change over the Indian sub-continent including climatogenic vulnerability analyses of sea level rise (SLR) and crop production assessment. The geological perspectives of climate change over the Indian sub-continent are covered, along with highlighted climate impacts on the chemical weathering and maturity of sediments as well as on the manganese mineralisation in manganiferous quartzite in the Boringpadar-Amath area. The evolution of the monsoon, the most significant event of tropical belt is addressed through lake’s and river’s sediments, assessing the anthropogenic influences. Climatic conditions reconstructed through Quaternary alluvial sediments as proxy indicator of past climatic conditions over the Indian sub-continent are presented. There is also a separate chapter on the role of cosmic radio nuclide in paleoclimatic reconstructions. The inter-relation of climate change and tectonics over the Indian sub-continent is also covered, while the geopolitics on the conflicts of climate change have been discussed in the larger perspective of the South-Asian region.

Download or read book Terrestrial Impacts of the Holocene Asian Monsoon written by Anoop Ambili and published by Frontiers Media SA. This book was released on 2022-09-16 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Observed Climate Variability and Change over the Indian Region written by M. N. Rajeevan and published by Springer. This book was released on 2016-11-02 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the book is to make a comprehensive documentation of the observed variability and change of the regional climate system over the Indian region using the past observed data. The book addresses all the important parameters of regional climate system so that a physically consistent view of the changes of the climate system is documented. The book contains 16 chapters written by the subject experts from different academic and research institutes in India. The book addresses all important components/parameters of the climate system, like rainfall, temperature, humidity, clouds, moisture, sea surface temperature and ocean heat content, sea level, glaciers and snow cover, tropical cyclones and monsoon depressions, extreme rainfall and rainstorms, heat waves and cold waves, meteorological droughts, aerosols, atmospheric aerosols, ozone and trace gases and atmospheric radiative fluxes. One chapter deals with the past monsoon using monsoon proxy data. The last chapter deals with the future climate change projections over the Indian region (rainfall and temperature) made using coupled climate models. Most of the analyses (especially on rainfall, temperature, extreme rainfall, sea surface temperature, meteorological droughts) are based on the data for a longer period of 110 years, 1901–2010. For some other parameters like moisture, clouds, heat waves and cold waves, atmospheric aerosols, ozone and trace gases and radiative fluxes, data of shorter period have been used. The articles documented inter-annual and decadal variability in addition to documenting long term trends of different parameters. The trends have been tested for statistical significance using standard techniques. It is expected that the present book will be an excellent reference material for researchers as well as for policy makers. These results will be useful in interpreting future climate change scenarios over the region being projected using coupled climate models. Further analysis of these results is required for attributing the observed variability and change to natural and anthropogenic activities.

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 Sediments of the Northern Arabian Sea written by Richard A. Stewart and published by . This book was released on 1966 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report contains a discussion of temperature, salinity, and bottom sediment data collected during USS REQUISITE oceanographic survey in northern Arabian Sea during February and March 1961. The regional setting and the marine environment of the area are presented; field and laboratory sediment analyses procedures are explained; and figures showing the distribution of median grain size, clay mineral provinces, and percentages of calcium carbonate, organic carbon, and quartz in sand-size fraction are included. Heavy mineralogy of several sediment samples are given in tables. (Author).

Download or read book HISTORY AND DYNAMICS OF CLIMATE VARIABILITY IN THE ASIAN MONSOON REGION AND TROPICAL PACIFIC DURING THE LATE HOLOCENE written by Jessica Conroy and published by . This book was released on 2011 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large-scale climate modes are responsible for much of the Earth's climate variability. Despite the importance of these modes, we have limited understanding of how they vary on long timescales due to the short length of instrumental climate records. Fortunately, climate information stored in natural archives can provide us with information on how these modes varied in the more distant past. Lake sediments are an ideal climate archive since they are continuous, have high temporal resolution, and contain many potential climate proxies. In the present study, I use lake sediment records to assess past variability in three climate modes: the El Niño/Southern Oscillation, the Asian monsoon, and the Arctic Oscillation. Exploring modern precipitation variability across the Asian monsoon region, I found that precipitation is not coherent, which holds implications for paleorecords that are hypothesized to represent monsoon variability, including many lake sediment records. Monsoon precipitation in the Arabian Sea is distinct from precipitation in India and China, and increased precipitation in the Arabian Sea coincides with decreased precipitation in the western North Pacific. Furthermore, only precipitation in southwestern Tibet responds to the Southwest monsoon, whereas precipitation in southeastern Tibet responds to the western North Pacific monsoon. In southwestern Tibet, I have reconstructed dust variability over the last millennium using the lake sediment record from Kiang Co. Our record indicates increasing dust over the 20th century, and our hypothesized dust proxy is positively correlated with the summer Arctic Oscillation Index. A trend toward more positive Arctic Oscillation Index values as well as higher temperatures over the 20th century likely drove increased dustiness in southwestern Tibet, due the influence of temperature on glaciofluvial sediment availability in the Himalayas. Measurements of local climate, lake water and sediment at Genovesa Crater Lake, Galápagos, indicate the lake responds to local climate variability, with carbonate-rich sediments forming during prolonged dry periods (La Niña events), and organic-rich sediment forming during the warm periods. The ratios of silica and strontium to calcium also reflect cool season SST. Thus, this lake sediment record has potential to provide a record of both seasonal and ENSO variability spanning the Holocene.

Download or read book Late Glacial to Holocene Climate and Vegetation Changes on the Tibetan Plateau Inferred from Fossil Pollen Records in Lacustrine Sediments written by Yongbo Wang and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The past climate in central Asia, and especially on the Tibetan Plateau (TP), is of great importance for an understanding of global climate processes and for predicting the future climate. As a major influence on the climate in this region, the Asian Summer Monsoon (ASM) and its evolutionary history are of vital importance for accurate predictions. However, neither the evolutionary pattern of the summer monsoon nor the driving mechanisms behind it are yet clearly understood. For this research, I first synthesized previously published Late Glacial to Holocene climatic records from monsoonal central Asia in order to extract the general climate signals and the associated summer monsoon intensities. New climate and vegetation sequences were then established using improved quantitative methods, focusing on fossil pollen records recovered from Tibetan lakes and also incorporating new modern datasets. The pollen-vegetation and vegetation-climate relationships on the TP were also evaluated in order to achieve a better understanding of fossil pollen records. The synthesis of previously published moisture-related palaeoclimate records in monsoonal central Asia revealed generally different temporal patterns for the two monsoonal subsystems, i.e. the Indian Summer Monsoon (ISM) and East Asian Summer Monsoon (EASM). The ISM appears to have experienced maximum wet conditions during the early Holocene, while many records from the area affected by the EASM indicate relatively dry conditions at that time, particularly in north-central China where the maximum moisture levels occurred during the middle Holocene. A detailed consideration of possible driving factors affecting the summer monsoon, including summer solar insolation and sea surface temperatures, revealed that the ISM was primarily driven by variations in northern hemisphere solar insolation, and that the EASM may have been constrained by the ISM resulting in asynchronous patterns of evolution for these two subsystems. This hypothesis is further supported by modern monsoon indices estimated using the NCEP/NCAR Reanalysis data from the last 50 years, which indicate a significant negative correlation between the two summer monsoon subsystems. By analogy with the early Holocene, intensification of the ISM during coming decades could lead to increased aridification elsewhere as a result of the asynchronous nature of the monsoon subsystems, as can already be observed in the meteorological data from the last 15 years. A quantitative climate reconstruction using fossil pollen records was achieved through analysis of sediment core recovered from Lake Donggi Cona (in the north-eastern part of the TP) which has been dated back to the Last Glacial Maximum (LGM). A new data-set of modern pollen collected from large lakes in arid to semi-arid regions of central Asia is also presented herein. The concept of "pollen source area" was introduced to modern climate calibration based on pollen from large lakes, and was applied to the fossil pollen sequence from Lake Donggi Cona. Extremely dry conditions were found to have dominated the LGM, and a subsequent gradually increasing trend in moisture during the Late Glacial period was terminated by an abrupt reversion to a dry phase that lasted for about 1000 years and coincided with the first Heinrich Event of the northern Atlantic region. Subsequent periods corresponding to the warm Bølling-Allerød period and the Younger Dryas cold event were followed by moist conditions during the early Holocene, with annual precipitation of up to about 400 mm. A slightly drier trend after 9 cal ka BP was then followed by a second wet phase during the middle Holocene that lasted until 4.5 cal ka BP. Relatively steady conditions with only slight fluctuations then dominated the late Holocene, resulting in the present climatic conditions. In order to investigate the relationship between vegetation and climate, temporal variations in the possible driving factors for vegetation change on the northern TP were examined using a high resolution late Holocene pollen record from Lake Kusai. Moving-window Redundancy Analyses (RDAs) were used to evaluate the correlations between pollen assemblages and individual sedimentary proxies. These analyses have revealed frequent fluctuations in the relative abundances of alpine steppe and alpine desert components, and in particular a decrease in the total vegetation cover at around 1500 cal a BP. The climate was found to have had an important influence on vegetation changes when conditions were relatively wet and stable. However, after the 1500 cal a BP threshold in vegetation cover was crossed the vegetation appears to have been affected more by extreme events such as dust storms or fluvial erosion than by the general climatic trends. In addition, pollen spectra over the last 600 years have been revealed by Procrustes analysis to be significantly different from those recovered from older samples, which is attributed to an increased human impact that resulted in unprecedented changes to the composition of the vegetation. Theoretical models that have been developed and widely applied to the European area (i.e. the Extended R-Value (ERV) model and the Regional Estimates of Vegetation Abundance from Large Sites (REVEALS) model) have been applied to the high alpine TP ecosystems in order to investigate the pollen-vegetation relationships, as well as for quantitative reconstructions of vegetation abundance. The modern pollen-vegetation relationships for four common pollen species on the TP have been investigated using Poaceae as the reference taxa. The ERV Submodel 2 yielded relatively high PPEs for the steppe and desert taxa (Artemisia Chenopodiaceae), and low PPEs for the Cyperaceae that are characteristic of the alpine Kobresia meadows. The plant abundances on the central and north-eastern TP were quantified by applying these PPEs to four post-Late Glacial fossil pollen sequences. The reconstructed vegetation assemblages for the four pollen sequences always yielded smaller compositional species turnovers than suggested by the pollen spectra, indicating that the strength of the previously-reported vegetation changes may therefore have been overestimated. In summary, the key findings of this thesis are that (a) the two ASM subsystems show asynchronous patterns during both the Holocene and modern time periods, (b) fossil pollen records from large lakes reflect regional signals for which the pollen source areas need to be taken into account, (c) climate is not always the main driver for vegetation change, and (d) previously reported vegetation changes on the TP may have been overestimated because they ignored inter-species variations in pollen productivity

Download or read book Natural Climate Variability on Decade to Century Time Scales written by National Research Council and published by National Academies Press. This book was released on 1996-08-30 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reflects the current state of scientific knowledge about natural climate variability on decade-to-century time scales. It covers a wide range of relevant subjects, including the characteristics of the atmosphere and ocean environments as well as the methods used to describe and analyze them, such as proxy data and numerical models. They clearly demonstrate the range, persistence, and magnitude of climate variability as represented by many different indicators. Not only do natural climate variations have important socioeconomic effects, but they must be better understood before possible anthropogenic effects (from greenhouse gas emissions, for instance) can be evaluated. A topical essay introduces each of the disciplines represented, providing the nonscientist with a perspective on the field and linking the papers to the larger issues in climate research. In its conclusions section, the book evaluates progress in the different areas and makes recommendations for the direction and conduct of future climate research. This book, while consisting of technical papers, is also accessible to the interested layperson.

Download or read book Lake Records of Environmental and Climate Change on the Tibetan Plateau written by Zhang Chengjun and published by Frontiers Media SA. This book was released on 2022-11-07 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Role of Tropics in Climate Change written by Neloy Khare and published by Elsevier. This book was released on 2023-11-28 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Role of Tropics in Climate Change: Global Case Studies uses a 20-chapter, easy-to-understand format to centralize the practical application ideas for functional metagenomics. This important resource not only includes chapters on next-generation sequencing technologies to study important biogeochemical cycles, degradation pathways and detoxification, but also gives insight into several tools that have been developed to integrate metadata and sequence data, allowing downstream comparative analyses of different datasets using several ecological indices. The book further explains newly developed techniques for sequencing DNA, generating shorter fragments than Sanger sequencing techniques to quickly read larger sequences in a shorter amount of time. - Provides a wealth of information to readers on state-of-the-art applications of metagenomics - Summarizes our current knowledge of the use of metagenomics and gives a novel and powerful insight into the already existing bioremediation process - Gives an overall picture of metagenomics and its application, processes, and future prospects in the field of bioremediation

Download or read book Assessment of Climate Change over the Indian Region written by R. Krishnan and published by Springer Nature. This book was released on 2020-06-12 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book discusses the impact of human-induced global climate change on the regional climate and monsoons of the Indian subcontinent, adjoining Indian Ocean and the Himalayas. It documents the regional climate change projections based on the climate models used in the IPCC Fifth Assessment Report (AR5) and climate change modeling studies using the IITM Earth System Model (ESM) and CORDEX South Asia datasets. The IPCC assessment reports, published every 6–7 years, constitute important reference materials for major policy decisions on climate change, adaptation, and mitigation. While the IPCC assessment reports largely provide a global perspective on climate change, the focus on regional climate change aspects is considerably limited. The effects of climate change over the Indian subcontinent involve complex physical processes on different space and time scales, especially given that the mean climate of this region is generally shaped by the Indian monsoon and the unique high-elevation geographical features such as the Himalayas, the Western Ghats, the Tibetan Plateau and the adjoining Indian Ocean, Arabian Sea, and Bay of Bengal. This book also presents policy relevant information based on robust scientific analysis and assessments of the observed and projected future climate change over the Indian region.