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The Seasonal Dynamics Of Colored Dissolved Organic Matter In The Mississippi River Plume And Northern Gulf Of Mexico
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Book Synopsis The Seasonal Dynamics of Colored Dissolved Organic Matter in the Mississippi River Plume and Northern Gulf of Mexico by : Vanessa Marie Wright
Download or read book The Seasonal Dynamics of Colored Dissolved Organic Matter in the Mississippi River Plume and Northern Gulf of Mexico written by Vanessa Marie Wright and published by . This book was released on 2005 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photobiogeochemistry of Organic Matter by : Khan M.G. Mostofa
Download or read book Photobiogeochemistry of Organic Matter written by Khan M.G. Mostofa and published by Springer Science & Business Media. This book was released on 2012-12-15 with total page 919 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photoinduced processes, caused by natural sunlight, are key functions for sustaining all living organisms through production and transformation of organic matter (OM) in the biosphere. Production of hydrogen peroxide (H2O2) from OM is a primary step of photoinduced processes, because H2O2 acts as strong reductant and oxidant. It is potentially important in many aquatic reactions, also in association with photosynthesis. Allochthonous and autochthonous dissolved organic matter (DOM) can be involved into several photoinduced or biological processes. DOM subsequently undergoes several physical, chemical, photoinduced and biological processes, which can be affected by global warming. This book is uniquely structured to overview some vital issues, such as: DOM; H2O2 and ROOH; HO•; Degradation of DOM; CDOM, FDOM; Photosynthesis; Chlorophyll; Metal complexation, and Global warming, as well as their mutual interrelationships, based on updated scientific results.
Book Synopsis Mississippi River Plume Variability in the Gulf of Mexico Based on Modis-aqua and Smap Observations by : Carolina Ernani Da Silva
Download or read book Mississippi River Plume Variability in the Gulf of Mexico Based on Modis-aqua and Smap Observations written by Carolina Ernani Da Silva and published by . This book was released on 2018 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mississippi River is an important source of freshwater and of terrigenous material to the Gulf of Mexico (GoM). This study aims to describe the Mississippi River Plume (MRP) seasonality and its interaction with the GoM circulation. We used terrigenous dissolved organic carbon from MODIS-Aqua and sea surface salinity from Soil Moisture Active Passive (SMAP) satellite to trace the distribution of the river plume in the coastal ocean. For the first time, the frequency of plume occurrence in the Gulf of Mexico was quantified. The MRP distribution on monthly time scales is controlled primarily by river discharge and by alongshore winds, with the maximum plume extension occurring during summer due to frequent reversions in winds. Two anomalous events in 2015 and 2016 demonstrated the importance of the interplay between upwelling-favorable winds, peaks in river discharge, the Loop Current and associated eddies on the offshore transport of MRP waters.
Book Synopsis Linking Optical and Chemical Properties of Dissolved Organic Matter in Natural Waters by : Christopher L. Osburn
Download or read book Linking Optical and Chemical Properties of Dissolved Organic Matter in Natural Waters written by Christopher L. Osburn and published by Frontiers Media SA. This book was released on 2017-01-17 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: A substantial increase in the number of studies using the optical properties (absorbance and fluorescence) of dissolved organic matter (DOM) as a proxy for its chemical properties in estuaries and the coastal and open ocean has occurred during the last decade. We are making progress on finding the actual chemical compounds or phenomena responsible for DOM’s optical properties. Ultrahigh resolution mass spectrometry, in particular, has made important progress in making the key connections between optics and chemistry. But serious questions remain and the last major special issue on DOM optics and chemistry occurred nearly 10 years ago. Controversies remain from the non-specific optical properties of DOM that are not linked to discrete sources, and sometimes provide conflicting information. The use of optics, which is relatively easier to employ in synoptic and high resolution sampling to determine chemistry, is a critical connection to make and can lead to major advances in our understanding of organic matter cycling in all aquatic ecosystems. The contentions and controversies raised by our poor understanding of the linkages between optics and chemistry of DOM are bottlenecks that need to be addressed and overcome.
Book Synopsis The Global Coastal Ocean: Panregional syntheses and the coasts of North and South America and Asia by : Allan R. Robinson
Download or read book The Global Coastal Ocean: Panregional syntheses and the coasts of North and South America and Asia written by Allan R. Robinson and published by Harvard University Press. This book was released on 1962 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt: A continuing, comprehensive and timely survey of the state of knowledge of ocean science, this distinguished series provides an overview of research frontiers as ocean science progresses. Areas covered include physical, biological, and chemical oceanography, marine geology, and geophysics and the interactions of the oceans with the atmosphere, the solid earth, and ice. Because ocean science is evolving so rapidly, straining the boundaries of traditional sub-disciplines, interdisciplinary topics have a special place in this series--including those topics related to the application of ocean science, for example, to ocean technology, marine operations, and the resources of the sea. As a treatise on advances and new developments, each topical volume starts with fundamentals and covers recent progress, so as to provide a balanced account of how oceanography is evolving. Previous volumes (1-12) in the series are now available from Harvard University Press. In the manifold, multidisciplinary efforts of.
Book Synopsis Investigation of Colored Dissolved Organic Matter and Dissolved Organic Carbon Using Combination of Ocean Color Data and Numerical Model in the Northern Gulf of Mexico by : Nazanin Chaichitehrani
Download or read book Investigation of Colored Dissolved Organic Matter and Dissolved Organic Carbon Using Combination of Ocean Color Data and Numerical Model in the Northern Gulf of Mexico written by Nazanin Chaichitehrani and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gulf of Mexico Origin, Waters, and Biota by : John W. Tunnell (Jr.)
Download or read book Gulf of Mexico Origin, Waters, and Biota written by John W. Tunnell (Jr.) and published by . This book was released on 2009 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling Colored Dissolved Organic Matter (CDOM) Dynamics and Distributions on Seasonal to Inter-annual Time Scales in the Open Ocean by : Jonathan L. Klamberg
Download or read book Modeling Colored Dissolved Organic Matter (CDOM) Dynamics and Distributions on Seasonal to Inter-annual Time Scales in the Open Ocean written by Jonathan L. Klamberg and published by . This book was released on 2005 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Dynamics of the Mississippi River Plume and Interactions with the Gulf of Mexico Offshore Circulation by : Rafael V Schiller
Download or read book The Dynamics of the Mississippi River Plume and Interactions with the Gulf of Mexico Offshore Circulation written by Rafael V Schiller and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: River plumes often develop in complex environments, where variable coastal and bottom topography, ambient currents, winds and tides may play important roles in shaping the plume evolution. When all these factors are present, the plume dynamics may become intricate and unclear. The objective of this study is to understand the processes controlling the dynamics of a large river plume that is affected by strong boundary currents, variable winds and complex topography. The Mississippi River (MR) plume is the study case of this dissertation work, and focus is given to the interactions between the plume and the offshore circulation of the Gulf of Mexico (GoM). A series of numerical experiments was designed to investigate the impact of different factors on the development of a large scale river plume in scenarios with variable degrees of complexity. First, a box-like model with an idealized estuary was designed to address the general development of a mid-latitude river plume and assess the variability of the plume with changes in the outflow conditions at the river mouth. The structure and development of the plume in the flat-bottom, receiving basin was highly dependent on the degree of freshwater mixing at the source. Larger freshwater mixing enhanced the estuarine gravitational circulation and modified the dynamical balance at the estuary mouth. Those changes effectively modified the shape of the bulge and length/transport scales of the coastal current. Sloping-bottom conditions further modified the development of the plume. Secondly, a Northern GoM model was designed and numerical experiments were conducted to investigate the specific dynamics of the MR plume, in the presence of both shelf and basin-wide circulation. In particular, buoyancy-driven (due to the MR and all other major Northern GoM rivers) and wind-driven currents were studied on the shelf, while the extension of the Loop Current and associated frontal eddies were considered as major factors in the shelf to offshore interactions; wind-driven, shelfbreak eddies were also considered. Process-oriented experiments demonstrate that westerly and southerly winds promoted the development of a surface Ekman layer that enhances the offshore advection of plume waters. The steep topography in the vicinity of the MR Delta was a favorable condition for that process. When the MR plume was subject to a full-blown scenario (realistically-forced experiment nested within a large-scale model), complex interactions between wind-driven and eddy-driven dynamics determined the fate of the plume waters. Offshore removal is a frequent plume pathway, and the offshore transport can be as large as the wind-driven shelf transport. The offshore pathways depend on the position of the eddies near the shelf edge, their life span and the formation of eddy pairs that generate coherent cross-shelf flows. Strong eddy-plume interactions were observed when the Loop Current (LC) system impinged against the shelfbreak, causing the formation of coherent, narrow low-salinity bands that extended toward the Gulf interior. The offshore transport of MR water is a year-round process, but the interactions between the MR plume and the LC system have large inter-annual variability. Plume to LC interactions are determined by episodic northward intrusions of the LC system in the NGoM. The interactions are dictated by the proximity of the LC system to the MR Delta and by wind effects. On average, plume to LC interactions correspond to ~ 12 % of the year-round, total freshwater transport near the MR Delta, but this percentage can go up to 30 % in individual years. At the time of the plume to LC interactions, an average value of LC freshwater entrainment was estimated to be ~ 4,150 m3 s-1. The findings presented here are a major contribution toward the understanding of the cross-marginal and basin-wide transport of MR waters by a large-scale current system, and the connectivity to remote regions, such as the South Florida region and the Florida Keys.
Book Synopsis Data on Natural Organic Substances in Dissolved, Colloidal, Suspended-silt, and -clay, and Bed-sediment Phases in the Mississippi River and Some of Its Tributaries, 1991-92 by :
Download or read book Data on Natural Organic Substances in Dissolved, Colloidal, Suspended-silt, and -clay, and Bed-sediment Phases in the Mississippi River and Some of Its Tributaries, 1991-92 written by and published by . This book was released on 1995 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Outstanding Topics in Ocean Optics by : Dariusz Stramski
Download or read book Outstanding Topics in Ocean Optics written by Dariusz Stramski and published by MDPI. This book was released on 2019-04-23 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean optics is a branch of oceanography which is firmly embedded in studies of a great variety of ocean science and engineering questions. The interactive nature between radiative transfer of light and various dissolved and particulate constituents of seawater is at the core of ocean optics science and applications. The transfer of radiant solar energy has vital implications to life and climate on Earth, and the large variety of subjects of ocean optics ranges from the subtle problems of physical optics to optical remote sensing towards a better understanding of ocean biology, biogeochemistry and ecosystems and their roles in the Earth's system processes. The intention of this book is to present a collection of papers that generally share a common denominator of frontier topics in ocean optics which are unique, uncommon or outstanding in the literature, and to provide a balanced view of the extraordinary breadth of research in this field. Topics as diverse as measurements and modeling of radiative transfer, light fields, light scattering and polarization, ocean color, benthic optical properties, and the use of optics for characterizing seawater constituents are addressed in this book. The book is expected to be of interest and useful to a broad audience of professional ocean scientists, engineers and advanced students with an interest in ocean optics and applications of optical methods in oceanography.
Book Synopsis Fluorescence and Size Characterization of Dissolved Organic Matter in Riverine and Sea Waters in the Northern Gulf of Mexico by : Zhengzhen Zhou
Download or read book Fluorescence and Size Characterization of Dissolved Organic Matter in Riverine and Sea Waters in the Northern Gulf of Mexico written by Zhengzhen Zhou and published by . This book was released on 2012 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Carbon and Nutrient Fluxes in Continental Margins by : Kon-Kee Liu
Download or read book Carbon and Nutrient Fluxes in Continental Margins written by Kon-Kee Liu and published by Springer Science & Business Media. This book was released on 2010-02-11 with total page 757 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a product of the joint JGOFS (Joint Global Ocean Flux Study)/LOICZ (Land–Ocean Interactions in the Coastal Zone) Continental Margins Task Team which was established to facilitate continental margins research in the two projects. It contains signi cant information on the physical, biogeochemical, and ecosystems of continental margins nationally and regionally and provides a very valuable synthesis of this information and the physical, biogeochemical and ecosystem processes which occur on continental margins. The publication of this book is timely as it provides a very strong foundation for the development of the joint IMBER (Integrated Marine Biogeochemistry and Ecosystems Research)/LOICZ Science Plan and Implemen- tion Strategy for biogeochemical and ecosystems research in the continental margins and the impacts of global change on these systems. This initiative will move forward integrated biogeochemical and ecosystems research in the continental margins. We thank all the contributors to this volume and especially Kon-Kee Liu who has dedicated a great deal of time to ensuring a high-quality book is published. IMBER Scienti c Steering Committee Julie Hall LOICZ Scienti c Steering Committee Jozef Pacyna v 1 Preface In general, interfaces between the Earth’s larger material reservoirs (i. e. , the land, atmosphere, ocean, and sediments) are important in the control of the biogeoche- cal dynamics and cycling of the major bio-essential elements, including carbon (C), nitrogen (N), phosphorus (P), sulfur (S), and silicon (Si), found in organic matter and the inorganic skeletons, shells, and tests of benthic and marine organisms.
Book Synopsis Temporal and Spatial Patterns in Optical Properties of Colored Dissolved Organic Matter on Florida's Gulf Coast by : Robyn Nicole Conmy
Download or read book Temporal and Spatial Patterns in Optical Properties of Colored Dissolved Organic Matter on Florida's Gulf Coast written by Robyn Nicole Conmy and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Characterization of Colored Dissolved Organic Matter (CDOM) in surface and ground waters in South Florida was conducted using fluorescence and absorption spectroscopy. Waters of the West Florida Shelf are heavily influenced by many river systems on Florida's Gulf Coast that, to the first order control CDOM distributions on the shelf. Seasonal surveys revealed that changes in the underwater light field as a result of major hurricanes and resuspension events are linked closely with a number of factors prior to a storm's passing such as the presence of persistant blooms, rainfall and discharge. Additionally, storm track and wind direction were found to play a significant role in CDOM signatures. A study of ten riversheds located between the Mississippi / Atchafalya River system and the Shark River in the Everglades revealed a wide range in CDOM seasonality. A regional dependence of CDOM was also found, where highest aromaticity and concentration of organic material was found for the southernmost watersheds. Basin characteristics, vegetation differences, land use and climatic patterns are implicated in the cause for regional differences. In addition to surface flow, organic material in groundwater was measured in deep and shallow aquifers surrounding the Tampa Bay Estuary. As a result of strong hydrologic links between shallow aquifers and the overlying surface waters, CDOM in both reservoirs were found to be quite similar. Deep aquifers (> 150 ft) however are less concentrated and have CDOM signatures more similar to marine waters. This suggests similar biogeochemical pathways of the material, including the influence of the aquatic microbial community. Furthermore, multi-spectral CDOM fluorescence measurements were shown to be a potential indicator of groundwater presence in Tampa Bay during times of low surficial discharge to the bay, and when some rivers are almost entirely spring-fed. Investigating CDOM distribution and signatures is vital to carbon budget and cycling questions. The amount and quality of organic material has significant implications for ecosystems, thereby affecting organisms that use CDOM as a food source, light availability for photosynthesis, UV shading provided to biota, satellite estimates of chlorophyll a, metal binding, materials transport and overall water quality.
Book Synopsis Influence of the Mississippi River Plume on Diazotroph Distributions in the Northern Gulf of Mexico During Summer 2011 by : Ellen Marie Knapke
Download or read book Influence of the Mississippi River Plume on Diazotroph Distributions in the Northern Gulf of Mexico During Summer 2011 written by Ellen Marie Knapke and published by . This book was released on 2012 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the subtropical oligotrophic ocean, nitrogen fixation is an important source of new nitrogen (N) for supporting biological production. Previous studies have found that nitrogen-fixing Diatom-Diazotroph Associations (DDAs) are in high abundance in the intermediate salinity zone of large river plumes such as the Amazon and Mekong rivers, while Trichodesmium spp. becomes more abundant at higher salinities. This recurring pattern in the Amazon River plume suggests that strong salinity and nutrient gradients within the river plumes may lead to a cascade in diazotroph communities. I hypothesized that the Mississippi River, a major source of freshwater, nutrients and sediments to the northern Gulf of Mexico, creates a similar distribution of diazotroph communities. The relationship between large diazotrophs and salinity was examined in samples collected in July 2011 during a flood outflow from the Mississippi River. The dominant DDA, Hemiaulus spp. -- Richelia spp., was at greatest abundance (≈31,000 cells L-1) west of the birdfoot delta on the periphery of the plume (≈29 salinity) where bottom water hypoxia was also observed. Trichodesmium spp., a cyanobacterium genus that occurs in both colonial and free trichome morphologies, was abundant at both high (≈35) salinities east of the delta reaching 20+ colonies L-1, as well as in the fresher (≈28) waters of the plume where it reached 3,500 trichomes L-1. Diazotroph distributions were separated east and west of the Mississippi River outflow, with DDAs being most abundant over bottom water hypoxic regions to the west and Trichodesmium spp. in high abundance to the east. The diazotroph -- salinity gradient relationships present within the Amazon River plume were not present within the Gulf of Mexico. This study suggests that environmental factors other than salinity, such as nutrients or hypoxia, are influencing the distribution of diazotrophs around the Mississippi River plume. The seasonal hypoxia seen in the Gulf of Mexico with the co-occurring DDA increase could appear in other river systems.
Book Synopsis Aquatic Organic Matter Fluorescence by : Paula G. Coble
Download or read book Aquatic Organic Matter Fluorescence written by Paula G. Coble and published by Cambridge University Press. This book was released on 2014-07-14 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: A core text on principles, laboratory/field methodologies, and data interpretation for fluorescence applications in aquatic science, for advanced students and researchers.
Book Synopsis Biogeochemistry of Gulf of Mexico Estuaries by : Thomas S. Bianchi
Download or read book Biogeochemistry of Gulf of Mexico Estuaries written by Thomas S. Bianchi and published by John Wiley & Sons. This book was released on 1998-10-26 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: The definitive ecological guide to the Gulf of MexicoEstuaries Today the ecological health of the Gulf of Mexico--long the base ofvast commercial fisheries--is at risk from a potent array ofthreats, from increased nutrient inputs to the loss of coastalwetlands that impact water quality. Never before has knowledge of the biogeochemical processes of theGulf's estuaries and wetlands been so critical to its preservation,and yet until now research on this vital area has beenfragmented. Biogeochemistry of Gulf of Mexico Estuaries offers a comprehensive,integrated examination of these vital natural resources and theirecology. Featuring contributions from a diverse group of expertscientists from all regions of the Gulf Coast, thisinterdisciplinary reference provides extensive coverage of what isknown about biogeochemical processes--and the factors that regulatethem--in warm temperate and subtropical systems. Organized around aframework that integrates geomorphology, sedimentary processes,nutrient cycling, and trace metals chemistry, it not onlydemonstrates how the Gulf's estuarine systems work, but alsoestablishes a basis for how they compare with other, better-studiedtemperate estuaries. In addition, the book features afascinating--and timely--examination of the effects ofbiogeochemical processes on estuarine management. Biogeochemistry of Gulf of Mexico Estuaries will be welcomed byecologists, marine scientists, environmental activists, and anyoneinvolved with managing these precious natural resources.
