Download or read book Surface Chlorophyll Distributions in the Upper Gulf of Thailand Investigated Using Satellite Imagery and Ecosystem Model written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: MERIS data and Nutrient-Phytoplankton-Zooplankton-Detritus (NPZD) ecosystem model coupled with the Princeton Ocean Model (POM), were used to investigate seasonal variations in surface chlorophyll distributions and their controlling factors to clarify phytoplankton dynamics in the upper Gulf of Thailand. Chlorophyll maps were produced by application on MERIS Level 2 data an empirical algorithm derived from the regression analysis of the relationship between chlorophyll-a concentration and remote sensing reflectance ratio. The results indicated that the patterns of seasonal chlorophyll distributions corresponded to local wind and water circulations. The model simulation highlighted the importance of river water as a significant nutrient source, and its movement after discharge into the sea is controlled by seasonal circulations. High chlorophyll concentration located along the western coast following the direction of counter-clockwise circulation, forced by the northeast winds, while chlorophyll accumulation was observed in the northeastern corner of the gulf due to clockwise circulation, driven by the southwest winds. These key simulated results are consistent with those of field observations and satellite images captured in the same periods of time, and also described seasonal shifting of blooming areas previously reported. Sensitivity analysis of simulated chlorophyll distributions suggested that not only nutrients but also wind-induced vertical movement plays a significant role in controlling phytoplankton growth. Plankton blooms occur in zones of upwelling or where vertical diffusivities are low. Increasing nutrients in the water column due to river loads leads to increasing potential for severe plankton blooms when other photosynthetic factors, such as water stability and light, are optimized. The knowledge of seasonal patterns of blooming can be used to construct environmental risk maps which are very useful for planning to mitigate the eutrophic problems. Effe.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2009 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guide to Programs of Geography in the United States and Canada written by and published by . This book was released on 2008 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pilot Investigation of Chlorophyll Distribution Using Satellite Imagery in South Eastern Australian Waters written by David James Carpenter and published by . This book was released on 1983 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temporal and Spatial Distribution of Chlorophyll on the West Florida Shelf written by Danylle N. Ault and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The West Florida Shelf (WFS), typically characterized as being oligotrophic, is one of the most productive continental shelves in the United States. In addition to supporting a large fishing industry, the WFS also supports high biomass blooms of the toxic dinoflagellate Karenia brevis. Because of the large ecological and economic impacts these blooms have on the area, the ECOHAB: Florida program was developed to gain a better understanding of red tides and their initiation, maintenance, and dispersal. This interdisciplinary program consisted of monthly cruises from June 1998 through December 2001, with a hiatus from January through March of 2001. Hydrography, nutrients, chlorophyll a, phaeopigments, and a wide variety of other factors were measured during the cruises. In this paper chlorophyll a and phaeopigment concentration, nutrients, and hydrographic data were examined to explain the temporal and spatial distribution of chlorophyll on the shelf. Average surface chlorophyll values were 0.55 mg/m^3 with near bottom values averaging 0.85 mg/m^3. Chlorophyll was found to be highest near the estuaries of Tampa Bay and Charlotte Harbor with a decreasing gradient seaward. Near bottom chlorophyll values were generally two to fourfold greater than surface values. Midshelf stations (35-50 m) were characterized by high near bottom chlorophyll, whereas the offshore stations (86-200 m) were characterized by a subsurface chlorophyll maximum ranging between 40 to 80 m deep. Nutrients were generally low across the shelf except for 1998 when a subsurface intrusion of nutrient rich slope water reached to the 20 m isobath. Temperatures ranged from 14.00° C to 31.47° C. Salinity ranged from 30.5 to 37.50 in the study area. Four blooms of Karenia brevis, lasting several months, contributed to the high chlorophyll concentrations along the inner shelf. Maximum chlorophyll concentrations of 27.10 mg/m^3 were a result of the October 1999 to March 2000 red tide. Blooms of Trichodesmium and diatoms also were contributors to patterns seen on the shelf. Maximum chlorophyll values were generally highest in the late summer and fall except for offshore values which showed little to no seasonality. Inshore of the 50 m isobath, average phaeopigments comprised from 43 to 68 percent of the measured Chl a, while offshore values were from 68 to over 100 percent. Inshore chlorophyll distributions were attributed to riverine and estuarine flux of nutrients, localized upwelling, and recycling of nutrients aided by salinity and temperature fronts. Midshelf distributions were attributed to the movement of biologically important material through the bottom Ekman layer from offshore to the inshore regions of the shelf. Offshore distributions were attributed to Loop Current upwelling and synoptic scale processes associated with seasonal meteorological forcing.
Download or read book Physical Controls on the Distribution of Phytoplankton Round the Crozet Plateau Southern Ocean written by Hugh James Venables and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The spatial and temporal distribution of phytoplankton around the Crozet Plateau, Southern Ocean, is studied through a variety of satellite datasets and in situ cruise and Argo float measurements. Parts of the study area regularly contain phytoplankton concentrations significantly enhanced over the other parts, and over most of the rest of the Southern Ocean, due to natural iron fertilization from the Crozet Islands. Study is made of these contrasts in order to further understand the processes that limit phytoplankton over the mostly High Nutrient Low Chlorophyll (HNLC) Southern Ocean. The longer timescales, larger areas and regularity of naturally iron-fertilized phytoplankton blooms make them preferable to study compared to studies of the effects of iron released from a ship. Data from these experiments, and from other islands in the Southern Ocean, is investigated in the context of the results found around the Crozet Plateau. The circulation patterns around the Crozet Plateau are studied in detail, with particular emphasis on understanding where surface water that has passed close to the Crozet Islands flows, as this is a known source of iron to the surface water. The surface mixed layer depth and incoming irradiance are also studied so that the variation in light availability with time and latitude can be understood. The distribution of phytoplankton is studied through satellite chlorophyll-a images, with values adjusted to match those observed in situ during the research cruises. The initial development of the bloom is controlled by variations in light availability but the advection and lateral mixing of iron is sufficient to explain the spatial extent of the bloom and the variations in peak chlorophyll-a concentrations. The variability of the strength of the bloom is driven mostly by variations in the iron utilization by phytoplankton during the preceding winter and wind-driven variations in the circulation.
Download or read book Distributed Computing Model of Multispectral Time Series Data Analysis for Chlorophyll Concentration Determination Using Ocean Color Monitor 2 Data written by M. Prabu and published by . This book was released on 2018 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: In general, the ocean color monitor sensor (OCM) is used to identify and monitor the phytoplankton bloom and fishing zones. In the ocean, there is a food chain among plants and fish, and by calculating the normalized difference vegetation index (NDVI), we can identify chlorophyll concentration of the particular ocean area. NDVI is an indication of the presence of chlorophyll concentration. In this study, importance is given to the NDVI of ocean area, because our Earth is mostly occupied by the ocean in the sense of water. OCM sensor data are used to identify the chlorophyll, which in turn indicates the presence of phytoplankton. This is the primary production in the basic food chain, and also for the fishes. Remote sensing methodology is used to find and understand the spatial allocation of oceanwater constituents. Usually, the phytoplankton pigment emits a greenish color in the seawater, which is the visible region in the ocean. It enables plant objects to be identified from among the other suspended matter on the oceanwater. NDVI is mainly used in land applications to identify vegetation and forestation, and it is used to identify the chlorophyll pigment concentration of the ocean surface. Therefore, NDVI can be used to map chlorophyll-determined zones through which possible fishing zones can be generated. This study also shows that the NDVI generation technique is used to discover the resources of seawater for mapping the fishing zones. However, the limitation on large-scale computation for the entire earth surface leaves challenges toward raising the technological solution. Hence, an attempt is made to integrate a distributed computational model to cover the larger spatial data. Therefore, a grid-based satellite image processing system is designed to discover the chlorophyll pigment concentration on the ocean through NDVI generation. With multiple computing nodes of the configured grid, the spatial coverage on the oceanic surface is widened and computational speed is also improved to yield a promising outcome.
Download or read book Earth Resources written by and published by . This book was released on 1978 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Global Ecology and Oceanography of Harmful Algal Blooms written by Patricia M. Glibert and published by Springer. This book was released on 2018-04-26 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Harmful algal blooms (HABs) - blooms that cause fish kills, contaminate seafood with toxins, or cause human or ecological health impacts and harm to local economies - are occurring more often, in more places and lasting longer than in past decades. This expansion is primarily the result of human activities, through increased nutrient inputs and various aspects of climate change. The Global Ecology and Oceanography of Harmful Algal Blooms (GEOHAB) programme promoted international collaboration to understand HAB population dynamics in various oceanographic regimes and to improve the prediction of HABs. This volume introduces readers to the overarching framework of the GEOHAB programme, factors contributing to the global expansion of harmful algal blooms, the complexities of HABs in different habitats, and the forward-looking issues to be tackled by the next generation of GEOHAB, GlobalHAB. The programme brought together an international team of contributing scientists and ecosystem managers, and its outcomes will greatly benefit the international research community.
Download or read book The Environment in Asia Pacific Harbours written by Eric Wolanski and published by Springer Science & Business Media. This book was released on 2006-07-30 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: Urbanization has reached unprecedented levels in the estuarine and coastal zone, particularly in the Asia Pacific region where mega-cities and mega-harbours are still growing. This book demonstrates the different solutions and pitfalls, successes and failures in a large number of ports and harbours in the Asia Pacific Region, and shows how science can provide ecologically sustainable solutions that apply wherever the growth of mega-harbours occurs.
Download or read book Introduction to the Physical and Biological Oceanography of Shelf Seas written by John H. Simpson and published by Cambridge University Press. This book was released on 2012-03-29 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this exciting and innovative textbook, two leading oceanographers bring together the fundamental physics and biology of the coastal ocean in a quantitative but accessible way for undergraduate and graduate students. Shelf sea processes are comprehensively explained from first principles using an integrated approach to oceanography that helps build a clear understanding of how shelf sea physics underpins key biological processes in these environmentally sensitive regions. Using many observational and model examples, worked problems and software tools, the authors explain the range of physical controls on primary biological production and shelf sea ecosystems. Boxes throughout the book present extra detail for each topic and non-mathematical summary points are provided for physics sections, allowing students to develop an intuitive understanding. The book is fully supported by extensive online materials, including worked solutions to end-of-chapter exercises, additional homework/exam problems with solutions and simple MATLAB and FORTRAN models for running simulations.
Download or read book Spatio Temporal Statistics with R written by Christopher K. Wikle and published by CRC Press. This book was released on 2019-02-18 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world is becoming increasingly complex, with larger quantities of data available to be analyzed. It so happens that much of these "big data" that are available are spatio-temporal in nature, meaning that they can be indexed by their spatial locations and time stamps. Spatio-Temporal Statistics with R provides an accessible introduction to statistical analysis of spatio-temporal data, with hands-on applications of the statistical methods using R Labs found at the end of each chapter. The book: Gives a step-by-step approach to analyzing spatio-temporal data, starting with visualization, then statistical modelling, with an emphasis on hierarchical statistical models and basis function expansions, and finishing with model evaluation Provides a gradual entry to the methodological aspects of spatio-temporal statistics Provides broad coverage of using R as well as "R Tips" throughout. Features detailed examples and applications in end-of-chapter Labs Features "Technical Notes" throughout to provide additional technical detail where relevant Supplemented by a website featuring the associated R package, data, reviews, errata, a discussion forum, and more The book fills a void in the literature and available software, providing a bridge for students and researchers alike who wish to learn the basics of spatio-temporal statistics. It is written in an informal style and functions as a down-to-earth introduction to the subject. Any reader familiar with calculus-based probability and statistics, and who is comfortable with basic matrix-algebra representations of statistical models, would find this book easy to follow. The goal is to give as many people as possible the tools and confidence to analyze spatio-temporal data.
Download or read book Ocean Biogeochemistry written by Michael J.R. Fasham and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oceans account for 50% of the anthropogenic CO2 released into the atmosphere. During the past 15 years an international programme, the Joint Global Ocean Flux Study (JGOFS), has been studying the ocean carbon cycle to quantify and model the biological and physical processes whereby CO2 is pumped from the ocean's surface to the depths of the ocean, where it can remain for hundreds of years. This project is one of the largest multi-disciplinary studies of the oceans ever carried out and this book synthesises the results. It covers all aspects of the topic ranging from air-sea exchange with CO2, the role of physical mixing, the uptake of CO2 by marine algae, the fluxes of carbon and nitrogen through the marine food chain to the subsequent export of carbon to the depths of the ocean. Special emphasis is laid on predicting future climatic change.
Download or read book The Ocean and Cryosphere in a Changing Climate written by Intergovernmental Panel on Climate Change (IPCC) and published by Cambridge University Press. This book was released on 2022-04-30 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for assessing the science related to climate change. It provides policymakers with regular assessments of the scientific basis of human-induced climate change, its impacts and future risks, and options for adaptation and mitigation. This IPCC Special Report on the Ocean and Cryosphere in a Changing Climate is the most comprehensive and up-to-date assessment of the observed and projected changes to the ocean and cryosphere and their associated impacts and risks, with a focus on resilience, risk management response options, and adaptation measures, considering both their potential and limitations. It brings together knowledge on physical and biogeochemical changes, the interplay with ecosystem changes, and the implications for human communities. It serves policymakers, decision makers, stakeholders, and all interested parties with unbiased, up-to-date, policy-relevant information. This title is also available as Open Access on Cambridge Core.
Download or read book The Gulf of Guinea Large Marine Ecosystem written by J.M. McGlade and published by Elsevier. This book was released on 2002-08-15 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Gulf of Guinea volume is part of a series on the Large Marine Ecosystems. This volume combines the latest research on the Gulf of Guinea from scientists working primarily in the region and from Europe. It covers the dynamics of the oceanic and coastal waters of the region, the major biological resources, pollution in the marine environment and the socio-economics and governance of marine fisheries. A significant number of new data sets, including some which have been repatriated from outside the region, are now made available through this publication.The combination of the various chapters underlines the interlinkages that exist between the interannual and seasonal dynamical behaviour of the oceanic offshore waters and the living marine resources along the coast, and the direct effect they have on the livelihoods of the populations living throughout the Gulf of Guinea.The volume is intended for those who have a general interest in the region as well as those who work professionally in the field. It will also be of immense value to resource managers and policy-makers as a demonstration project on how research can help solve the pressing problems of economic and food security in coastal regions.
Download or read book World Atlas of Seagrasses written by Frederick T. Short and published by Univ of California Press. This book was released on 2003 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seagrasses are a vital and widespread but often overlooked coastal marine habitat. This volume provides a global survey of their distribution and conservation status.
Download or read book Physical Oceanography of the Southeast Asian Waters written by Klaus Wyrtki and published by . This book was released on 1961 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
