Download or read book The Use of Lake Water Temperature and Ice Cover as Climatic Indicators written by Dale Martin Robertson and published by . This book was released on 1989 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Use of Lake Water Temperature and Ice Cover as Climatic Indicators written by Dale Martin Robertson and published by . This book was released on 1989 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Use of Lake Ice Conditions to Monitor Climatic Change written by John C. Anderson and published by . This book was released on 1987 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was undertaken to evaluate the potential of using lake ice free-up and break-up dates as indicators of climatic, and more specifically air temperature change. Following a review of the relevant literature, the report focusses on the development of analytical methodology and its application to the ice record of Long Lake, located near Yellowknife, NWT. Summary analyses are provided as Appendices for two addition stationsm Watson Lake, Y.T. and Ennadai Lake, NWT. Results of the analyses are generally encouraging, particularly for Long Lake and Ennadai Lake. Correlation coefficients as high as 0.89 were obtained for analyses of water-clear-of-ice date versus air temperatures during various time periods, and 0.83 for analyses pertaining to the date of complete freeze-over. Significant correlations were also obtained in relating ice season duration to mean air temperatures for selected 12-month periods. Though several of the relationships were highly significant, the dependence of freeze-up and break-up on factors additional to air temperature must be kept in mind when attempting to make projections based on these analyses. -- abstract.
Download or read book General Technical Report SE written by and published by . This book was released on 1990 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book River and Lake Ice Processes Impacts of Freshwater Ice on Aquatic Ecosystems in a Changing Globe written by Karl-Erich Lindenschmidt and published by MDPI. This book was released on 2019-01-11 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "River and Lake Ice Processes—Impacts of Freshwater Ice on Aquatic Ecosystems in a Changing Globe" that was published in Water
Download or read book Modeling Ice Cover and Water Temperature of Lake Mendota written by and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this work is to build lake physical templates, i.e., ice cover, thermal structure, and transport processes through modeling approaches. Knowledge of lake physics can be further used for ecosystem and climate change studies. Specifically, the following two science questions are addressed using the lake physical template developed in this study: (1) How do lake temperate and ice cover vary in response to long-term (~ 100 years) changing climate, and what are physical drivers. (2) At a short-term scale (~ less than 1 year), what is the spatial and temporal variation when lake experiencing natural (e.g. meteorological inputs) and/or manmade (e.g. effluent discharge) disturbances. Both one-dimensional (1D) and three-dimensional (3D) lake hydrodynamic-ice models were developed to have continuous simulations over the course of the year. The study lake of this thesis, on which all the field experiments and model simulations are focused, is Lake Mendota, located in Madison, Wisconsin, USA (43o40'N, 89o24'W). In summary, Chapter 2 presents validation and application of a 1-D hydrodynamic-ice model in simulating a continuous 100-year period (1911-2010) of ice cover and water temperature. Influences of three important drivers (air temperature, wind speed, and water clarity) on ice cover and thermal structure during the past century was investigated. Also, with the knowledge of lake responses to the past climatic conditions, some suggestions about how the lake might respond to changes in these three important drivers associated with future climate changes were presented. In Chapter 3, the 1D-version ice module was extended to a 3D framework and coupled with an existing three dimensional (3D) hydrodynamic model. The coupled 3D hydrodynamic-ice model was applied to simulate the temporal and spatial variations of ice cover. Besides, some features of under-ice hydrodynamics were discussed. In Chapter 4, modeling transport of buoyant effluent plume during the summer stratified season was presented. In closing, conclusions and some recommendations for future study are summarized in Chapter 5.
Download or read book Physical Limnology written by Jorg Imberger and published by Elsevier. This book was released on 2022-10-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physical Limnology provides the physical, chemical, and biological information practitioners need to effectively manage inland waters. Physical processes in lakes are known to have significant influence on driving the biology, chemistry, and geology in aquatic environments. In addition to covering the current knowledge in the area of lake physics, this helpful guide also provides coverage of some of the latest challenges in physical limnology. Physical Limnology also covers the mathematical modeling necessary to make basic calculations related to what is happening in lakes. Authored by one of the recognized world leaders in the field Covers the latest physical, chemical, and biological process information, making the work accessible to the general limnologist , lake practitioner, or biologist Provides examples from the author's experience working with lakes around the world Features coverage of the latest challenges in physical limnology
Download or read book Water Temperature Characteristics of Lakes Subjected to Climate Change written by Midhat Hondzo and published by . This book was released on 1992 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: A deterministic, one dimensional, unsteady lake water temperature model was modified and validated to simulate the seasonal (spring to fall) temperature statification structure over a wide range of lake morphometries, trophic and meteorological conditions. Model coefficients related to hypolimnetic eddy diffusivity, light attenuation, wind sheltering, ad convective heat transfer were generalized using theoretical and empirical extensions. Propagation of uncertainty in the lake temperature model was studied using a vector state-space method. The output uncertainty was defined as the result of deviations of meteorological variables from their mean values. Surface water temperatures were affected by uncertain meteorological forcing. Air temperture and dew point temperature fluctuations had significant effects on lake temperature uncertainty. The method presents a useful alternative for studying long-term averages and variability of the water temperature structure in lakes due to variable meteorological forcing. The lake water temperature model was linked to a daily meteorological data base to simulate daily water temperature in several specific lakes as well as 27 lake classes characteristic for the north central US. Case studies of lake water temperature and stratification response to variable climate were made in a particulary warm year (1988) and a more normal one (1971). A regional analysis was conducted for 27 lake classes over a period of twenty-five years (1955-1979). Output from a global climate model (GISS) was used to modify te meteorological data base to account for a doubling of atmospheric CO2. The simulations predict that after climate change: 1) epilimnetic water temperatures will be higher but will increase less than air temperature, 2) hypolimnetic temperatures in seasonally stratified dimictic lakes will be largely unchanged and in some cases lower than at present, 3) evaporative water loss will be increased by as much as 300 mm for the open water season, 4) onset of stratification will occur earlier and overturn will occur later in the season, and 5) overall lake stability will become greater in spring and sumer.
Download or read book Climate Variability and Ecosystem Response written by David Greenland and published by . This book was released on 1990 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freshwater Ecosystems written by National Research Council and published by National Academies Press. This book was released on 1996-10-27 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: To fulfill its commitment to clean water, the United States depends on limnology, a multidisciplinary science that seeks to understand the behavior of freshwater bodies by integrating aspects of all basic sciencesâ€"from chemistry and fluid mechanics to botany, ichthyology, and microbiology. Now, prominent limnologists are concerned about this important field, citing the lack of adequate educational programs and other issues. Freshwater Ecosystems responds with recommendations for strengthening the field and ensuring the readiness of the next generation of practitioners. Highlighted with case studies, this book explores limnology's place in the university structure and the need for curriculum reform, with concrete suggestions for curricula and field research at the undergraduate, graduate, and postdoctoral levels. The volume examines the wide-ranging career opportunities for limnologists and recommends strategies for integrating limnology more fully into water resource decision management. Freshwater Ecosystems tells the story of limnology and its most prominent practitioners and examines the current strengths and weaknesses of the field. The committee discusses how limnology can contribute to appropriate policies for industrial waste, wetlands destruction, the release of greenhouse gases, extensive damming of rivers, the zebra mussel and other "invasions" of speciesâ€"the broad spectrum of problems that threaten the nation's freshwater supply. Freshwater Ecosystems provides the foundation for improving a field whose importance will continue to increase as human populations grow and place even greater demands on freshwater resources. This volume will be of value to administrators of university and government science programs, faculty and students in aquatic science, aquatic resource managers, and clean-water advocatesâ€"and it is readily accessible to the concerned individual.
Download or read book Freezing of Lakes and the Evolution of their Ice Cover written by Matti Leppäranta and published by Springer Science & Business Media. This book was released on 2014-11-28 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large number of boreal lakes are ice-covered in winter. However, research and literature of these lakes concerns by far only the open water season. In particular, no textbook on physics of ice-covered lakes exists, and now it would be a proper time to prepare such. Winter limnology has become an increasing active field of research recently. A series of winter limnology symposia was started in 2008 in Finland with nearly 100 participants. The second symposium was held in Berlin in 2010 and the third one is coming in 2012 in Norway. Winter limnologists need strongly a textbook on lake ice physics since the ice acts as their boundary condition.
Download or read book A Comparison of the Heat Balance of Lakes in Winter written by Jon T. Scott and published by . This book was released on 1964 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Study of fifty-three lakes in Wisconsin during the winter of 1962-63 showed that differences of lake morphometry produce large lake-to-lake variations in many of the heat balance terms and in ice phenology. Lake depth and size are the most significant morphometric features influencing heat balance and phenology. Differences in lake morphometry produce a larger variation in ice thickness in one area than a latitude difference of 250 miles. The mean temperature of the water on the lake closing date and maximum ice thickness are significantly correlated with mean fetch of the lakes. A multiple regression analysis shows that mean depth is not significantly correlated with these two factors. Lake depth influences the change in mean temperature of the water, especially during cooling and for a short period after opening. Shallow lakes close before deep lakes. Opening date is influenced by both size and depth of the lake. The lakes are good climatic indicators provided morphometric factors which produce non-climatic effects are taken into account. Maximum ice thickness and ice phenology data are useful climatic indicators. (Author).
Download or read book Abrupt Climate Change written by National Research Council and published by National Academies Press. This book was released on 2002-04-23 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: The climate record for the past 100,000 years clearly indicates that the climate system has undergone periodic-and often extreme-shifts, sometimes in as little as a decade or less. The causes of abrupt climate changes have not been clearly established, but the triggering of events is likely to be the result of multiple natural processes. Abrupt climate changes of the magnitude seen in the past would have far-reaching implications for human society and ecosystems, including major impacts on energy consumption and water supply demands. Could such a change happen again? Are human activities exacerbating the likelihood of abrupt climate change? What are the potential societal consequences of such a change? Abrupt Climate Change: Inevitable Surprises looks at the current scientific evidence and theoretical understanding to describe what is currently known about abrupt climate change, including patterns and magnitudes, mechanisms, and probability of occurrence. It identifies critical knowledge gaps concerning the potential for future abrupt changes, including those aspects of change most important to society and economies, and outlines a research strategy to close those gaps. Based on the best and most current research available, this book surveys the history of climate change and makes a series of specific recommendations for the future.
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 Environmental Setting and Implications for Water Quality in the Western Lake Michigan Drainages written by Charles A. Peters and published by . This book was released on 1997 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freezing of Lakes and the Evolution of Their Ice Cover written by Matti Leppäranta and published by Springer Nature. This book was released on 2023-07-05 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book updates the first edition for the status of knowledge in the physics of lake ice and the interactions between the ice cover and the liquid water underneath. Since the first edition was written in 2013, there has been a lot of progress in the field, in particular concerning environmental questions and the impact of climate change. Life conditions in ice-covered lakes and practical matters are now brought more into the picture so that the revision also properly serves as a handbook for applications. The author has worked widely with boreal lakes, polar lakes and Central Asian lakes that provides a wide geographical spectrum. Chapter 1 gives a brief overview and presents the research fields. The second chapter contains the classification of ice-covered lakes and observation techniques, especially remote sensing. In Chapter 3, the structure and properties of lake ice are presented including optics and geochemistry. Ice growth and melting are treated in Chapter 4, while the following chapter focuses on ice mechanics with applications to traffic on ice and ice loads. Chapter 6 goes into the exotic environment of pro-glacial lakes. Chapter 7 contains the stratification and circulation of the water body beneath lake ice, Chapter 8 presents the winter ecology of freezing lakes and discusses the lake ice interface toward the society, and Chapter 9 summarizes the climate change impact on lake ice seasons. The book ends into a brief closing chapter and list of references. Research problems for student learning are listed throughout the book. Annexes are included to provide numerical data of constants and standard formulae to help practical calculations and student tasks. Lake ice closely interacts with human living conditions, but people have learnt to live with that and to utilize the ice. In the present time this is true for on-ice traffic and recreation activities. Ice fishing has become a widely enjoyed hobby, and winter sports such as skiing, skating, and ice sailing are popular activities on frozen lakes. The lake ice response to eventual climate warming would appear as a shortening of the ice season due to the increasing air temperature and also as changing of the quality of the ice seasons via changes in ice thickness and structure. The book gives the whole story of lake ice into a single volume. The second, revised edition updates the content based on recent progress in winter limnology and ice physics research and applications. The author has contributed to lake ice research since the 1980s. In particular, his topics have been lake ice structure and thermodynamics, light transfer in ice and snow, ice mechanics in large lakes, and lake ice climatology. Mathematical modeling of ice growth, drift, and decay are covered in this research.
Download or read book The Impact of Climate Change on European Lakes written by Glen George and published by Springer Science & Business Media. This book was released on 2009-11-27 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, scientists from eleven countries summarize the results of an EU project (CLIME) that explored the effects of observed and projected changes in the climate on the dynamics of lakes in Northern, Western and Central Europe. Historical measurements from eighteen sites were used to compare the seasonal dynamics of the lakes and to assess their sensitivity to local, regional and global-scale changes in the weather. Simulations using a common set of water quality models, perturbed by six climate-change scenarios, were then used to assess the uncertainties associated with the projected changes in the climate. The book includes chapters on the phenology and modelling of lake ice, the supply and recycling of nitrogen and phosphorus, the flux of dissolved organic carbon and the growth and the seasonal succession of phytoplankton. There are also chapters on the coherent responses of lakes to changes in the circulation of the atmosphere, the development of a web-based Decision Support System and the implications of climate change for the Water Framework Directive.
