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Remote Assessment of Ocean Color for Interpretation of Satellite Visible Imagery
A Review
Häftad, Engelska, 1983
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a working group on water color measurements was formed to assess water color remote sensing at that time. The water color session of the COSPAR/SCOR/IUCRM Symposium 'Oceanography from Space' held in Venice (May 1980. which will begin with an outline of the basic physics of water color remote sensing and the fundamentals of atmospheric corrections.
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The papers contained in this volume were presented orally at the seventh POLYMODEL conference, held at Sunderland Polytechnic in the United King dom in May 1984 and sponsored by Barclays Bank PLC and Imperial Chemical Industries Ltd. The conferences are organised annually by the North East of England Polytechnic's Mathematical Modelling and Computer Simulation Group - POLYMODEL. The Group is a non-profit making organisation based on the mathematics department of the three polytechnics in the region and has membership drawn from those educational institutions and from regional industry. Its objective is to promote research and collaboration in mathematical and computer-based modelling. After a short introductory chapter, the volume may be considered as dividing naturally into four parts. Chapters 2 to 5 constitute the first part on Tides, Storm Surges and Coastal Circulations which deals with the hydrodynamics of coastal seas. Chapters 6 to 11 concern Coastal Engine ering Modelling and discuss such coastal phenomena as beach erosion, sediment transport, and non-linear waves. The third part (Chapters 12 to 16) on Offshore Structures considers sea structures in general and the connections between the structures (hoses, moorings, pipelines) in particular. The last two chapters focus on Offshore Corrosion problems.
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Several textbooks and useful compendia on fisheries have been published recently, and others are in preparation. The question then arises: why publish another book on fisheries at this time? My answer is 1) that fishery research and management are such broad subjects that it is difficult, if not impossible, to cover them adequately in one volume; 2) that consequently each author has stressed those aspects of greatest immediate interest to him; and 3) that to the best of my knowl edge no adequate broad treatment of the sociopolitical aspects of fishery management has yet ·appeared, although some good discussions have been published for particular fisheries. This volume grew out of a course that I have taught for the last 12 years at the State University of New Yo·rk at Stony Brook. Originally, the title of the course was Fishery Ecology, which was a matter of surprise to some students when they attended the fi rst few 1 ectures. Despite the sudden recent emergence of ecology as a household word, most people do not understand what the term means. I have found that even some graduate students forget that man is a potent force in the dynamic state of aquatic life. This is not only because he does things that change the environment and so affects living things in it, but also because he has such strange ways of thinking and of managing his affairs.
Observations on the Ecology and Biology of Western Cape Cod Bay, Massachusetts
Häftad, Engelska, 1984
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Development and publication of this monograph are the result of the joint efforts of Boston Edison Company and the Pilgrim Administrative Technical Committee (PATC). The PATC is an advisory committee established in 1969 to ensure that Pilgrim Station marine studies have the benefit of Qualified scientific and technical advice and are responsive to regulatory agency concerns. The PATC is composed of representatives from the following: Massachusetts Division of Marine Fisheries Massachusetts Division of Water Pollution Control National Marine Fisheries Service (NOAA) U. S. Environmental Protection Agency U. S. Fish and Wildlife Service (Dept. of the Interior) University of Massachusetts Boston Edison Company The PATC formed the Pi 1 grim Stati on Marine Ecology Monograph Subcommi ttee to guide Monograph funding efforts, oversee technical aspects of preparation, consi der editor sel ecti on, advi se the edi tors and authors, and resol ve possi bl e conflicts. Members of the Subcommittee were as follows: W. Leigh Bridges - Mass. Div. Marine Fisheries (Subcommittee Chairman) Robert Lawton - Mass. Div. of Marine Fisheries Joseph Pelczarski - Mass. Office Coastal Zone Management Michael Ross - University of Massachusetts Robert Leger - U. S. Environmental Protection Agency Thomas Horst - Stone & Webster Engineering Corporation Richard Toner - Marine Research, Inc. Robert Anderson - Boston Edison Company Lewis Scotton - Boston Edison Company This publication was made possible by grants from: Massachusetts Office of Coastal Zone Management Boston Edison Company Massachusetts Division of Marine Fisheries U. S.
Estuarine Cohesive Sediment Dynamics
Proceedings of a Workshop on Cohesive Sediment Dynamics with Special Reference to Physical Processes in Estuaries, Tampa, Florida, November 12–14, 1984
Häftad, Engelska, 1986
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The background for the Workshop on Cohesive Sediment Dynamics - . !!!!!. Special Reference to Physical Processes in Estuaries is briefly outlined in Chapter I. Here I wish to acknowledge those whose support I consider to be pivotal to this under taking. My deepest appreciation goes to Cynthia Vey, whose organizational skills and dedicated effort made the completion of this volume possible. Thanks are also due to Gail Terry for workshop organization, Jean Branson for word processing and Lillean Pieter for helping with drawings. Finally, I must express my sincere appreciation to Arthur Ezra 9f the National Science Foundation for providing support (through Grant No. CEE-8401185) for the workshop, and to Hsiang Wang for depart mental encouragement. With deepest regret, I must note the untimely death of Ranjan Ariathurai, 39, on June 5, 1985, before this volume could be published. He was a guiding force to many within the small group of researchers in cohesive sediment dynamics, and his professional brilliance and inspirational personal qualities constituted the true spirit . behind the workshop. I trust this volume will serve, albeit in a small way, as a fitting memory to this spirit, and to the remarkable professional contributions Ranjan made during his short career. Professor Ray B. Krone Professor Emmanuel Partheniades Department of Civil Engineering Department of Engineering Sciences University of California University of Florida Davis, California Gainesville, Florida TABLE OF CONTENTS CHAPTER PAGE I. INTRODUCTION Ashish J. Mehta •••••••••••••••••••••••••••••••••••••••••••••••••••• 1 II.
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This book represents an outgrowth of an interdisciplinary session held at the Seventh International Estuarine Research Federation Conference held at Virginia Beach, Virginia, OCLober 1983. At that meeting, the participants agreed to contribute to and develop a monograph entitled "Tidal Mixing and Plankton Dynamics" by inviting an expanded group of authors to contribute chapters on this theme. The emphasis would be to review and summarize the considerable body of knowledge that has accumulated over the last decade or so on the fundamental role tidal mixing plays in energetic shallow seas and estuaries in stimulating and controlling biological production. We have attempted to provide a mix of contributions, composed of reviews of the state-of-the-art, reports on current research activi ties, summaries of the design and testing of a new generation of innovative instruments for biological and chemical sampling and sorting, and some imaginative ideas for future experiments on stimulated mixing in continental shelf seas. We encouraged the contributors to present critical and thought provoking assessments of current wisdom specifying the sorts of techniques and observational strategies needed to validate the various hypotheses linking physical structure, mixing and circulation to plankton biomass and production. We hope this volume will appeal to incoming research students and established scholars alike. We certainly have enjoyed working with all the authors in compiling this book. We thank the numerous scientists who have served as reviewers, P. Boisvert for typing the manuscripts and W. Bellows for proofreading.
Del 19 - Coastal and Estuarine Studies
Physical Nature and Structure of Oceanic Fronts
Häftad, Engelska, 1986
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During the past several years, research into the frontal divisions of the ocean has been particularly intensive. The significance of this lies not only in the fact that, in the five years from 1976 to 1980, more than 500 papers on this question were published in various journals throughout the world and at least three major international discussions were held (see p. 17). The newness of the discussion of the topic stems from the qualitative reinterpretation of the physical essence of the phenomenon and its role in the ocean, particularly in the processes of mixing and structure formation. While in the past the conventional view of fronts as boundaries between large scale water masses of the ocean only led to the recognition of convenient classi fication limits created by nature itself, there is now a tendency to study oceanic fronts as integral elements of the dynamics of oceanic waters. As we understand it, fronts are being associated more and more with the dynamic and kinematic features which arise when kinetic energy and enstrophy are transmitted through a cascade of scales characterizing various forms of motion of a stratified medium in laterally confined oceanic basins. We are beginning to get a better understanding of the role synoptic-scale oceanic eddies play in the process of frontogenesis in the ocean.
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The decision to build a nuclear power plant at Calvert Cliffs on the western shore of the Chesapeake Bay in southern Maryland resulted in a Iandmark legal decision (Calvert Cliffs Coordinating Committee vs Atomic Energy Commission) and began one ofthe mostintensive long-term studies ever carried out in an American estuarine system. In the pages that follow we describe the major results and findings from studies conducted over more than a decade by scientists from The Academy of Natural Seiences of Philadelphia (ANSP). These studies were designed to assess the potential effects that operation ofthe Calvert Cliffs Nuclear Power Plant (CCNPP) might have on the mid-portion of Chesapeake Bay. The approach taken was to study major biotic components of the system over an area and a time period sufficient to allow comparison of conditions between preoperational and operational periods within a sampling locality, and comparisons of conditions at reference sites with those at impact sites afterplant operations began. Elementschosen for detailed study included: species composition and production rates of major primary producers; water chemistry; zooplankton, benthos and finfish abundance and species composition; the abundance and growth rates of commercially important shellfish (clams, oysters and blue crabs); and the colonization sequences of invertebrates on artificial substrates.
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This volume is concerned with the role of science in fishery management. While this has traditionally been considered as largely a biological problem with clear biological objectives, close examination suggests that management decisions are largely controlled by political, social and economic considerations, biologically constrained. The biologist now has the task of reducing the uncertainties of the venture rather than determining its priorities or its allocation of benefits. The uncertainties arise in part because of lack of understanding of the ecological systems involved, the limited availability of critical information, and the unpredictability of driving forces. The volume reviews the assumptions and simplifications of fishery models, examines the decision making framework in fishery management, and compares management practices in North America, Japan, and Northern Europe. A compilation of fishery management objectives in international agreements and U.S. laws is included.
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Along much of the shoreline of the world, tidal inlets play an important role in nearshore processes, providing links between the coastal oceans and protected embayments. Their study is of particular importance not only for the understanding of fundamental processes in coastal oceanography but also for engineering and the proper management of the delicate equilibrium of our shorelines. This volume, based on the International Symposium on Hydrodynamics and Sediment Dynamics of Tidal Inlets held at Woods Hole, MA, presents the reader with an overview of contemporary research on these important features. The coverage includes: - mathematical modelling, including a review of inlet hydrodynamics, - observations on hydrodynamics, - sedimentology and morphology, - tidal deltas, - processes and policies pertaining to sedimentation, and the - impacts of shore protection and dredging in beaches.
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This volume represents a collection of pioneering papers introducing immunochemical techniques to the aquatic sciences. It is the product of a workshop entitled "Immunochemical Approaches to Coastal, Estuarine and Oceanographic Questions" held at the University of Southern Maine, Portland, Oct. 5-7, 1986. Funding from many sources made this workshop possible, and is gratefully acknowledged. The reader will note great variability in both the quality and scope of the papers which we have divided 'into four sections: I. Background material on the immune system (borrowed from a recent NIH publication) II. Background material related to aquatic sciences III. Techniques IV. Applications Readers familiar with terminology are directed to start with the original contributions related to aquatic sciences, page 21. Some of the contributions are abstracts only. Others are preliminary, for which we are grateful to the authors for their willingness to share recent sometimes tentative findings with a broader community. Some offer novel and tempting insights, but as they exist, lack adequate standards and controls. Others are thorough and represent major scientific contributions. The promise rests in generating and working with reagents of great specificity enabling orders of magnitude improvements in the sensitivity of our measurements. Authors also address the problems and limitations. We thank the numerous authors and reviewers. In support of every successful endeavor is someone of unusual savvy. For us, this has been David A. Phinney. His leadership, wisdom and wit have been important to the introduction of flow cytometry/sorting and immunochemistry into aquatic research.
Del 26 - Coastal and Estuarine Studies
Coastal Ocean Studies off Natal, South Africa
Häftad, Engelska, 1988
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Lying along the eastern seaboard of South Africa, the province of Natal has many important associations with the ocean. There is a considerable wealth of information available, presented by specialists from academia and state-funded research organizations. Thus, this volume provides the reader with a broad and thorough overview of the oceanography of this important region of the Southern African coastline. This volume will be of interest to a wide audience of oceanographers, marine geologists, and geographers.
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Deposit feeders, animals that derive nutrition from organic matter in sedimentary deposits, are dominant among the inhabitants of muds and, therefore, of the benthos of much of the ocean. In this volume the critical research problems pertaining to deposit feeders are identified and promising approaches for dealing with those problems are proposed. Interdisciplinary approaches are of utmost importance in the study of deposit feeders and their sedimentary environment, merging fields as disparate as nutritional physiology and sediment geochemistry. Among the topics presented are advances in theories of foraging and digestion, and new experimental approaches to study the potential foods, feeding behavior and physiology of animals that ingest sediment.
Del 57 - Coastal and Estuarine Studies
Nitrogen Loading in Coastal Water Bodies
An Atmospheric Perspective
Inbunden, Engelska, 2001
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Published by the American Geophysical Union as part of the Coastal and Estuarine Studies, Volume 57.Every time it rains, biologically active nitrogen compounds are transferred from the air to whatever surface lies underneath; what a farmer once called "the poor man's fertilizer." In fact, nitrogen containing compounds are transferred between surface and atmosphere even when it is not raining. That this atmospheric nitrogen deposition impacts on the environment is a scientifically accepted fact, established during the acid rain debates led by the National Acid Precipitation Assessment Program. The extent to which this deposition contributes to the decline of coastal waters around the United States due to over fertilization, however, is still under debate. In response to and as a continuation of this debate is the current work before you: the first attempt to consistently and comprehensively estimate the relative contribution of atmospherically delivered nitrogen to the total amount of nitrogen entering coastal estuaries around the United States.
Del 58 - Coastal and Estuarine Studies
Coastal Hypoxia
Consequences for Living Resources and Ecosystems
Inbunden, Engelska, 2001
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Published by the American Geophysical Union as part of the Coastal and Estuarine Studies, Volume 58.Hypoxia is a condition that occurs when dissolved oxygen falls below the level necessary to sustain most animal life. In U.S. coastal waters, and in the entire western Atlantic, we find the largest hypoxic zone in the northern Gulf of Mexico on the Louisiana/Texas continental shelf. The area affected, which is about the size of the state of New Jersey at its maximal extent, has increased since regular measurements began in 1985. Sediment cores from the hypoxic zone also show that algal production and deposition, as well as oxygen stress, were much lower earlier in the 190Os and that significant increases occurred in the latter half of the twentieth century. We publish this book against the background of such measurements, and to review how the developing and expanding hypoxic zone has affected living resources on this continental shelf.
Del 60 - Coastal and Estuarine Studies
Interactions Between Macro- and Microorganisms in Marine Sediments
Inbunden, Engelska, 2005
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Published by the American Geophysical Union as part of the Coastal and Estuarine Studies, Volume 60.Interactions between macroorganisms (benthic fauna and macrophytes) and the biogeo-chemistry and microbiology of aquatic sediments have proved essential for the functioning of most benthic marine ecosystems. While our knowledge of the biogeochemical consequences of macrobiological activity has grown considerably during the last two decades, the feedback mechanisms and physicochemical forces controlling the abundance and diversity of benthic animals and plants still elude definitive analysis. In order to clarify the state of the science and provide a framework for future research, we present in this volume a synthesis of latest developments in research on interactions between animals, plants, and microorganisms in marine sedimentary environments (including intertidal areas, continental shelves, deep-sea sediments, and cold seeps). Of particular importance are the new experimental (field studies, laboratory experiments) and theoretical (modeling) approaches, which we also discuss.
Del 61 - Coastal and Estuarine Studies
Coral Reefs and Climate Change
Science and Management
Inbunden, Engelska, 2006
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Published by the American Geophysical Union as part of the Coastal and Estuarine Studies, Volume 61. The effects of increased atmospheric carbon dioxide and related climate change on shallow coral reefs are gaining considerable attention for scientific and economic reasons worldwide. Although increased scientific research has improved our understanding of the response of coral reefs to climate change, we still lack key information that can help guide reef management. Research and monitoring of coral reef ecosystems over the past few decades have documented two major threats related to increasing concentrations of atmospheric CO2: (1) increased sea surface temperatures and (2) increased seawater acidity (lower pH). Higher atmospheric CO2 levels have resulted in rising sea surface temperatures and proven to be an acute threat to corals and other reef-dwelling organisms. Short periods (days) of elevated sea surface temperatures by as little as 1–2°C above the normal maximum temperature has led to more frequent and more widespread episodes of coral bleaching-the expulsion of symbiotic algae. A more chronic consequence of increasing atmospheric CO2 is the lowering of pH of surface waters, which affects the rate at which corals and other reef organisms secrete and build their calcium carbonate skeletons. Average pH of the surface ocean has already decreased by an estimated 0.1 unit since preindustrial times, and will continue to decline in concert with rising atmospheric CO2. These climate-related Stressors combined with other direct anthropogenic assaults, such as overfishing and pollution, weaken reef organisms and increase their susceptibility to disease.
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This monograph is an attempt to compile the present state of knowledge on ocean wave analysis and prediction.
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In this paper differences and anomalies in west coast seasonal flow structures have been highlighted. In particular, it was emphasized that flow off Washington has significant differences from that of Oregon; namely, during summer, flow at mid-shelf is more poleward off Washington, and during winter, flow on the inner-shelf is more equatorward off Washington than off Oregon. The former result may be related to the poleward decrease in the longshelf wind stress; the latter result may be related to the presence of the Columbia River plume. Off southern California the near-surface flow over the shelf is more persistently equatorward than that off Washington . Conversely, the flow over the slope in the upper 100 m of the water column is more persistently poleward than that off washington. Also, the undercurrent structure, that is, a subsurface maximum, is maintained at least from summer to early winter off southern California (no data are yet available from spring), but only during summer and early fall off washington. We note that the seasonal cycle of vertical shear in the two locations is similar, although a reversal in sign sometimes occurs off Washington. ACKNOWLEDGEMZNTS This work was supported by the Department of Energy under Grant DE-FG05-85ER60333t4 and by the National Science Foundation under Grant OCE 86-01058#1. 175 From: Adriana Huyer, College of Oceanography, Oregon State University, Corvallis, OR. On: Review and Commentary to paper POLEWARD FLOW NEAR TRE NORTRERH AND SOU'l'BERH BOONDARIES OF TRE U. S. WEST COAST, by Barbara Hickey.
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Estuaries, bays and contiguous coastal seas are the world's most valuable, and yet most vulnerable marine ecosystems. Fundamental to the protection and management of these important resources is an understand- ing of the physical processes involved which affect the circulation, mixing, and transport of salt, nutrients and sediment. Residual Currents and Long-Term Transport processes appear to have direct control over freshwater inflows, contaminant loadings, dispersion and transport of sediments and nutrients, and causes of declining living resources. This volume provides a comprehensive and up-to-date summary of the research results on these processes in estuaries and bays. Contributions from ten countries include results based on theoretical formulations, analyses of field data, numerical models and case studies.
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This is the first book for over twenty years on the physical, biological, chemical and geological characteristics of a large-scale estuary. Interdisciplinary, concise and cohesive, it is applicable as a model for worldwide estuary study. From the contents: Mathematical Modeling of Tides in the St. Lawrence Estuary.- Fronts and Mesoscale Features in the St. Lawrence Estuary.- Nearshore Sediment Dynamics in the St. Lawrence Estuary.- Organic Geochemical Studies in the St. Lawrence Estuary.
Enclosed Experimental Marine Ecosystems: A Review and Recommendations
A Contribution of the Scientific Committee on Oceanic Research Working Group 85
Häftad, Engelska, 2012
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The application of mesocosms, defined in this report as artificial 3 3 experimental enclosures ranging in size from 1 m to 10m , to address various problems in the marine sciences has been a relatively recent development. The application of the technology was dictated by the realization that many important ocean processes and interactions cannot be fully understood from observations in the natural environment or in smaller enclosures. Such studies involve, for example, determining the interactions between, and energy transfer from, one trophic level to another, the biogeochemical cycling of elements and compounds, etc. These and similar interactions and rate processes cannot normally be established in situations (nature) where the detection and quantification of rate processes are confused by advection and/or the inability to study the same populations over time. In the case of microcosms, mixed populations of primary producers, consumers, and carnivores cannot be maintained, in balance, for a sufficient length of time to determine normal interactions between the various components of these trophic levels. This report, prepared by SCOR Working Group 85, critically examines past applications of mesocosms to ocean research, though there is no attempt to comprehensively review all literature relevant to the subject. Further, the report outlines some important advances emanating from their use and provides recommendations for future applications. It constitutes the first of two reports from the Working Group (see Introduction).
Mathematical Modelling of Estuarine Physics
Proceedings of an International Symposium Held at the German Hydrographic Institute Hamburg, August 24–26, 1978
Häftad, Engelska, 1980
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Numerical simulations are in world wide use for the investigation of hydro- and thermodynamic processes in natural waters. In spite of the fact that great achievements have been brought about in this field, numerous questions still remain unanswered, with respect to fundamental formulations as well as to methods of solu- tion. One of the principal objectives of research in our days is the verification of numerical models. The Symposium on "Mathematical Modelling in Estuarine PhysiCS" was held at Hamburg, Aug. 24 - 26, 1978, with the objective of for- mulating the present standing of research work and of the most im- portant problems in this field. Aspects of physical oceanography and of coastal engineering were to be considered. Estuarine phys- ics were a suitable topic as both disciplines have many points in common there. Eighty-five scientists from sixteen countries convened for two and a half days to discuss details with much interest. We wish to thank them as well as the authors for their contributions.Further, we wish to express our gratitude to the German Research Foundation (Deutsche Forschungsgemeinschaft), Bonn-Bad Godesberg, to the Special Research Project 79 "Research in Coastal Waters" (Sonder- forschungsbereich 79 "Wasserforschung im Klistenbereich"), and to the German Hydrographic Institute (Deutsches Hydrographisches Institut), Hamburg, for sponsoring the meeting and for helping with the organization.
Managing the Ocean Resources of the United States
The Role of the Federal Marine Sanctuaries Program
Häftad, Engelska, 1982
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Federal programs applicable to the oceans and coastal zone have evolved incrementally in response to perceived needs to expedite emerging mari time development while conserving valuable marine resources.
Del 3 - Coastal and Estuarine Studies
Synthesis and Modelling of Intermittent Estuaries
A Case Study from Planning to Evaluation
Häftad, Engelska, 1983
534 kr
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This book reports on the findings of, and swnmarizes the conclusions from, the Port Hacking Estuary Project, a model-guided, multidisciplinary study of an estuarine ecosystem. The Project began in 1973, at a time when it was thought that environmental problems could be solved readily by assembling a multidisciplinary team of research scientists and having them co-ordinate their research around the construction of an ecosystem model. But a decade has passed and time has not been easy on this approach. The anticipated predictive dynamic models have not been produced and bitter argument has often marred the course of such studies. Yet the need to anticipate the flow of various chemical species (carbon, oxygen, nitrogen, phosphorus, toxicants) through the environment remains: the evidence is everywhere, from fertilization of urban lakes to acid rain. The magnitude of the problem ensures that funds will continue to be made available - although with short-term variations as perceptions swing. It is thus clear that although the difficulties are great, so is the need. It is from this background that we present this book. The Port Hacking Estuary Project involved some 15 - 20 research scientists over a period of 5 years. The goal was to research the flow of carbon into, within, and out of a small unpolluted estuary chosen for convenience rather than for its social significance. The idea was to use the information obtained from these studies to build a predictive dynamic model.
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This book has its genesis in materials collected in the Hestern Central Atlantic region in preparation for a regional seminar on the Changing Law of the Sea and its Implications for Fisheries in the Hestern Atlantic.
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When I was asked to organize this symposium on marine producti vity, it made me reflect on what aspects of this subject would be stimulating to a heterogeneous group of laboratory-oriented physiolo gists and biochemists. In recent years there have been several books which discusses the methodology commonly used in primary production studies and described the magnitude of photosynthetic CO reduction 2 in various areas of the world's oceans. I therefore decided to dis pense with these conventional aspects of primary production and invite researchers to speak on a variety of problems relating the abundance and activity of phytoplankton to environmental conditions. The lectures I invited were thus quite diverse in character, but all were related either to factors affecting the rate of photosynthesis or to the fate of reduced carbon as it passes through the microbial food web. In addition to these talks the participants benefited from a number of shorter presentations and poster sessions which dealt with production and cycling of organic carbon in the marine environment. February 1984 Osmund HOLM-HANSEN CONTENTS 1. Factors Governing Pelagic Production in Polar Oceans E. SAKSHAUG and O. HOLM-HANSEN •. ••. ••••. . . . . . •. •••. . ••••. •. •••• 1 2. Productivity of Antarctic Waters. A Reappraisal S. Z. EL-SAYED •. . . ••••••••. . •••. •. •••••••••. •••. •. •. . . . •. . . . •. 19 3. A Thermodynamic Description of Phytoplancton Growth D. A. KIEFER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4. Mechanisms of Organic Matter Utilization by Marine Bacterio plankton 45 F. AZAM and J. W.
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A wealth of information on osmotic and ionic reaulation in Estuarine and Marine Animals has been accumulated over the past decades. Beyond early studies of whole-animal responses to changes in envi- ronmental salinities, efforts have been made later on to identify, to localize and to characterize the organs and structures responsible for the control of the characteristics of the cell's environmental fluid. When considering the problem of cell volume control in animals facing media of fluctuating salinities, we are indeed dealing with two different categories of mechanisms. A first one is concerned with the control of the osmolality of the intracellular fluid, hence with the processes directly implicated in the maintenance of cell volume and shape. They have been extensively described in several recent review papers. The second category includes the processes controllin~ the charac- teristics of the cell's environmental fluid in order to minimize the amplitude of the osmotic shocks the cells may have to cope with upon acclimation to media of changed salinities. They are localized in particular organs and structures : the so-called "caZt-transporting" epithelia.Up to now, most of the studies on salt-transportino epithe- lia in estuarine and marine animals used the black box approach, so that little or sometimes nothing is still known on the physiological, the biochemical and the biophysical basis of the transporting mecha- nisms as well as on the structure-function relationships.
Del 18 - Coastal and Estuarine Studies
Environmental Hydraulics: Stratified Flows
Stratified Flows
Häftad, Engelska, 1986
534 kr
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The present lecture notes cover a first course in th~ most common types of stratified flows encountered in Environ mental Hydraulics. Separate chapters are devoted to Dense Bottom Currents, Free Penetrative Convec tion, Wind-driven Stratified Flow, Horizontal Buoyancy Flow and Vertical jet/plumes.