Subterranean Estuaries
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Subterranean Estuaries
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Author : Carlos Rocha
language : en
Publisher: Frontiers Media SA
Release Date : 2023-01-19
Subterranean Estuaries written by Carlos Rocha 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 2023-01-19 with Science categories.
Over recent decades, it has become widely recognized that water exchange between coastal aquifers and the ocean is an important component of the hydrologic cycle. Twenty years have passed since Willard S. Moore (Moore, 1999) introduced the term ‘subterranean estuary’ (STE) to identify those zones within coastal aquifers where fresh groundwater mixes with surface saltwater. Like open-water estuaries, STEs regulate the transfer of chemicals to the sea under the seashore by submarine groundwater discharge (SGD). This subterranean reactive node in the land-ocean exchange pathway has a physical, even if elusive, structure created by a combination of temporally and spatially variable mass transfer across the groundwater-ocean interface and dynamic flow processes. Many case studies have shown that SGD is a key material link between coastal watersheds and the sea and indeed spatially resolved budgets of radioactive tracers in shelf waters suggest it is the dominant bulk water flux to coastal zones globally. Clearly, STE outflow as SGD is a large source of biogeochemically active solutes to shelf seas, meaning that elemental budgets for these waters have to be revised in order to account for the new input. But how? Recognizing the global prevalence and potential environmental and societal impact of SGD, numerous attempts to quantify chemical inputs into the ocean through this pathway have been published over the past 40 years. However, the role of the STE in modulating chemical fluxes to coastal waters has been generally oversimplified, making a comprehensive analysis of cause and effect relationships between SGD inputs and ecosystem dynamics merely indicative. Unfortunately, we still lack a mechanistic understanding of the processes that control the interaction between allochthonous chemical delivery and autochthonous recycling in the STE that drive compositional variability of SGD flows. Like that applied to open-water estuaries, a general practical and theoretical framework is needed – one that captures the structure and biogeochemistry of STEs and allows more accurate understanding of the chemical composition of SGD outflows, while simultaneously providing for a typological basis that provides solid support for extrapolation of local SGD chemical flux measurements to regional, and from these to global, scale. A comprehensive and critical review of the current state-of-the-art would reveal that progress requires: a) improved variable-density groundwater flow models that provide more accurate predictions and insights into the flow, salt transport, and mixing dynamics in STEs; b) quantitative understanding of the physicochemical and temporal drivers of saline groundwater seepage and composition; and c) better knowledge of the microbial ecology of STEs and links to marine, freshwater, and terrestrial drivers of STE dynamics. Significant research effort has been devoted to addressing these knowledge gaps. It is now time to provide a focused synopsis of these efforts. We propose a combination of cutting-edge original research, systematic, practice and policy reviews, methods and hypothesis and theory articles, tied together by a direction-setting perspective analysis to generate a comprehensive and accurate scientific foundation supporting environmental managers, scientists, and other stakeholders to assess SGD feedbacks on coastal ecosystem functioning and resilience and implement successful coastal management policies.
Reactive Transport Modeling Of Biogeochemical Dynamics In Subterranean Estuaries
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Author : C. Spiteri
language : en
Publisher:
Release Date : 2007
Reactive Transport Modeling Of Biogeochemical Dynamics In Subterranean Estuaries written by C. Spiteri and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
The Importance Of Chemical Reactions In Subterranean Estuaries
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Author : Yoko Tsukamoto
language : en
Publisher:
Release Date : 2003
The Importance Of Chemical Reactions In Subterranean Estuaries written by Yoko Tsukamoto and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Chemical oceanography categories.
An Ecological And Biogeochemical Characterization Of A Subterranean Estuary In The Yucatan Peninsula Mexico
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Author : Sepp Leif Haukebo
language : en
Publisher:
Release Date : 2015
An Ecological And Biogeochemical Characterization Of A Subterranean Estuary In The Yucatan Peninsula Mexico written by Sepp Leif Haukebo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Subterranean estuaries are biogeochemical reactors within the coastal aquifer and represent a processing zone of dissolved chemical constituents prior to submarine groundwater discharge (SGD). Highly stratified hydrologic layers and sharp physicochemical boundaries characterize anchialine caves, a subset of subterranean estuaries. This study serves as a biogeochemical and ecological characterization of Sistema Crustacea, an anchialine cave in the Yucatan Peninsula with dense populations of cave-adapted invertebrates. Investigations of the physicochemical parameters found dissolved oxygen (DO) minimums and concurrent pH maximums as good indicators of localized microbial respiration within the shallow and deep haloclines. Beneath the deep halocline, a local DO and temperature maximum serve as evidence of counter current, tidal pumping of open seawater. Such evidence indicates that conventional circulation may not dominate groundwater flow along the Caribbean coast of Yucatan as some studies suggest. Spatial variability of chromophoric dissolved organic matter (CDOM) was investigated using fluorescence spectroscopy and parallel factor analysis (PARAFAC). A terrestrial source dominated the CDOM signal within the freshwater layers. However, there was a clear shift in the brackish and marine layers to CDOM derived from microbial activity. The greatest concentration of DOC occurred in the freshwater pool with decreasing values in the deeper hydrologic layers. Evidence for non-conservative removal of dissolved organic carbon (DOC) and total nitrogen (TN) suggests that Sistema Crustacea acts as a sink for terrestrially derived organic matter destined to reach the coast. The anomalies detected in the physicochemical profiles suggest microbial respiration is partly responsible for this carbon and nitrogen removal as well as the shift in CDOM sources. Swimming diver transects were used to characterize the invertebrate community throughout Sistema Crustacea and confirmed early observations that there are two ecologically distinct sections of the cave. The Eastern Section is characterized by high density of cave shrimp (Typhlatya pearsei), distributed in the brackish and marine layer, and remipedes (Xibalbanus tulumensis), observed solely in the marine layer. The Western Section shares the same entrance, but transects found a different species of remipede (Xibalbanus fuchscocksburni) and no T. pearsei. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/152453
Are Subterranean Estuaries A Source Of Chromophoric Dissolved Organic Matter Cdom To The Coastal Ocean
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Author : I. Gusti Ngurah Agung Suryaputra
language : en
Publisher:
Release Date : 2009
Are Subterranean Estuaries A Source Of Chromophoric Dissolved Organic Matter Cdom To The Coastal Ocean written by I. Gusti Ngurah Agung Suryaputra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
In a simple SGD model, CDOM concentrations in the bay were predicted by multiplying 222Rn concentrations in the bay (as a measure for SGD) with CDOM concentrations in the well (as the groundwater endmember). This was done for each hour during the entire sampling period. If a lag-time of one hour between groundwater and bay was considered, the predicted CDOM significantly correlated (p
Estuarine Ecology
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Author : Byron C. Crump
language : en
Publisher: John Wiley & Sons
Release Date : 2022-10-07
Estuarine Ecology written by Byron C. Crump and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-07 with Science categories.
Estuarine Ecology A detailed and accessible exploration of the fundamentals and the latest advances in estuarine ecology In the newly revised third edition of Estuarine Ecology, a team of distinguished ecologists presents the current knowledge in estuarine ecology with particular emphasis on recent trends and advances. The book is accessible to undergraduate students while also providing a welcome summary of up-to-date content for a more advanced readership. This latest edition is optimized for classroom use, with a more intuitive mode of presentation that takes into account feedback from the previous edition’s readers. Review questions and exercises have been added to assist in the learning and retention of complex concepts. Estuarine Ecology remains the gold standard for the discipline by taking stock of the manifold scientific breakthroughs made in the field since the last edition was written. It also offers: Thorough introductions to estuarine geomorphology, circulation, and chemistry In-depth treatments of estuarine primary and secondary production, including coastal marshes and mangrove wetlands A holistic view of estuarine ecosystems, their modeling and analysis, as well as the impact of human activities and climate change A companion website with detailed answers to exercise questions Perfect for students of estuarine ecology, environmental science, fisheries science, oceanography, and natural resource management, Estuarine Ecology will also earn a place in the libraries of professionals, government employees, and consultants working on estuary and wetlands management and conservation.
Estuarine Ecology
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Author : John W. Day, Jr.
language : en
Publisher: John Wiley & Sons
Release Date : 2012-11-19
Estuarine Ecology written by John W. Day, Jr. and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-19 with Science categories.
Estuaries are among the most biologically productive ecosystems on the planet--critical to the life cycles of fish, other aquatic animals, and the creatures which feed on them. Estuarine Ecology, Second Edition, covers the physical and chemical aspects of estuaries, the biology and ecology of key organisms, the flow of organic matter through estuaries, and human interactions, such as the environmental impact of fisheries on estuaries and the effects of global climate change on these important ecosystems. Authored by a team of world experts from the estuarine science community, this long-awaited, full-color edition includes new chapters covering phytoplankton, seagrasses, coastal marshes, mangroves, benthic algae, Integrated Coastal Zone Management techniques, and the effects of global climate change. It also features an entriely new section on estuarine ecosystem processes, trophic webs, ecosystem metabolism, and the interactions between estuaries and other ecosystems such as wetlands and marshes
Climate Change And Estuaries
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Author : Michael J. Kennish
language : en
Publisher: CRC Press
Release Date : 2023-09-15
Climate Change And Estuaries written by Michael J. Kennish and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-09-15 with Science categories.
Climate change is having an increasing impact on coastal, estuarine, and marine environments worldwide. This book provides state-of-the-art coverage of climate change effects on estuarine ecosystems from local, regional, and global perspectives. With editors among the most noted international scholars in coastal ecology and estuarine science and contributors who are world-class in their fields, the chapters in this volume consist of comprehensive studies in coastal, estuarine and marine sciences, climate change, and coastal management and provide an extensive international collection of data in tabular, illustrated, and narrative formats useful for coastal scientists, planners, and managers. Comprised of three sections: (1) physical-chemical aspects; (2) biological aspects; and (3) management aspects, the book not only examines climatic and non-climatic drivers of change affecting coastal, estuarine, and marine environments but also their interactions and effects on populations of organisms, communities, habitats, and ecosystem structure and function. Pulling together today’s most salient issues and key literature advances for those concerned with coastal management, it allows the reader to see across direct and indirect interactions among disciplinary and ecosystem boundaries. Climate Change and Estuaries meets the research needs of climate scientists, estuarine and marine biologists, marine chemists, marine geologists, hydrologists, and coastal engineers, while students, professors, administrators, and other professionals will also find it an exhaustive reference.
Temporal Variability In Chemical Cycling Of The Subterranean Estuary And Associated Chemical Loading To The Coastal Ocean
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Author : Meagan Joan Eagle Gonneea
language : en
Publisher:
Release Date : 2014
Temporal Variability In Chemical Cycling Of The Subterranean Estuary And Associated Chemical Loading To The Coastal Ocean written by Meagan Joan Eagle Gonneea and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Biogeochemical cycles categories.
At the land-ocean interface, terrestrial groundwater interacts with seawater to form a subterranean estuary, which can play host to dynamic biogeochemical cycling of nutrients, trace metals and radionuclides. This chemically altered groundwater enters the ocean through submarine groundwater discharge (SGD), a process that is driven by a number of physical processes acting on aquifers and the coastal ocean. In this thesis, seasonal variability in chemical cycling and associated loading to the coastal ocean was observed in a monthly time series within the Waquoit Bay (MA, USA) subterranean estuary. The position of the aquifer mixing zone moved seaward with an increase in hydraulic gradient, resulting in low salinity conditions and reduced mixing, while a decrease in gradient led to landward movement, high salinity groundwater and enhanced mixing. At this location, seasonal variability in sea level, not groundwater level, was the dominant variable driving the hydraulic gradient and therefore SGD. Fluxes of sediment bound cations to the ocean increased coincidently with sea level rise due to desorption. There was enhanced nitrogen attenuation during winter, potentially due to longer groundwater residence times, with greater nutrient delivery to coastal waters during the spring and summer bloom. Interannual climate fluctuations that control sea level and precipitation may ultimately control the timing and magnitude of chemical and water flux via SGD. In addition to temporal variability, aquifer lithology influences chemical export. This thesis also demonstrates that SGD from karst subterranean estuaries may play a role in local and global element budgets. The potential for the chemical signature of SGD to be recorded in the coral record was tested through a combination of coral culture experiments and field and modeling studies in the Yucatan Peninsula. Coral barium was well correlated with precipitation for a twelve-year record, with coral geochemistry reflecting the passage of a hurricane in 2002. While additional complexities in deciphering coral records remain, this proxy offers the potential to extend SGD records into the past.
Elements Of Physical Oceanography
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Author : John H. Steele
language : en
Publisher: Academic Press
Release Date : 2009-12-16
Elements Of Physical Oceanography written by John H. Steele and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-12-16 with Science categories.
Elements of Physical Oceanography is a derivative of the Encyclopedia of Ocean Sciences, 2nd Edition and serves as an important reference on current physical oceanography knowledge and expertise in one convenient and accessible source. Its selection of articles—all written by experts in their field—focuses on ocean physics, air-sea transfers, waves, mixing, ice, and the processes of transfer of properties such as heat, salinity, momentum and dissolved gases, within and into the ocean. Elements of Physical Oceanography serves as an ideal reference for topical research. References related articles in physical oceanography to facilitate further research Richly illustrated with figures and tables that aid in understanding key concepts Includes an introductory overview and then explores each topic in detail, making it useful to experts and graduate-level researchers Topical arrangement makes it the perfect desk reference