Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Ocean colour"”.
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Neural networks applied to ocean colour remote sensing for environmental monitoring
Autotrophic algal organisms that perform photosynthesis are the basis of the marine food web and absorb up to 30% of the anthropogenic emitted CO2 (Gruber et al., 2007). The algal concentration can be measured by retrieving their chlorophyll a concentration from remote sensing. The light signal …
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Global Trends in Merged Ocean Colour Data and Correction of Inter-Mission Inconsistencies
… is to assess global trends over 25 years in ocean colour variables and phytoplankton bloom timings in a changing climate using merged ocean colour data. However, the significant time series inconsistencies that arise from combining ocean colour data from different missions within merged …
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The fundamental role of spectral scattering in the ocean colour Phytoplankton Functional Type signal
… negative environmental impacts. Current oceanic bio-optical models do not perform well in elevated Chlorophyll a conditions, but the high biomass conditions of Southern African inland and coastal waters lend themselves extremely well to the development of phytoplankton IOP models as the …
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Qualitative and quantitative analyses of Lake Baikal's surface-waters using ocean colour satellite data (SeaWiFS)
… was made available to assess the potential of Ocean Colour data to provide spatial and seasonal information about the surface waters of Lake Baikal (Siberia). While discrete limnological field data is available, the spatial extension of Lake Baikal is enormous (ca. 600 km), while the field data …
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Evaluating multi-satellite chlorophyll-a datasets an ocean colour case study within the Southern Benguela
… pigment that can be derived from satellite ocean colour, is often used as a proxy for phytoplankton biomass and to derive primary productivity. Initiatives such as the Ocean Colour Climate Change Initiative (OC-CCI) produce merged multi-satellite products to create consistent long-term …
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Impact of Wind Driven Variability on Sea Surface Temperature and Ocean Colour in False Bay
… driven by the orography. Analyses of the SST and ocean colour imagery show that wind shadows are generally associated with warmer surface waters and higher Chl-a. In contrast, regions of enhanced wind speeds show colder surface waters and decreased chlorophyll concentration. Our results suggest …
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Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters
… forms the first step towards a comprehensive ocean colour satellite validation strategy for the Southern Benguela region, and underlines the value of a statistical radiometric validation as a prerequisite to any geophysical validation exercise. A radiometric validation exercise was performed …
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The bio-optical detection of harmful algal blooms
… simulation and quantitative interpretation of ocean colour data is presented, providing an inverse reflectance algorithm designed for the detection of harmful algal blooms. The adopted framework focuses on establishing quantitative relationships between optically important algal intracellular …
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Seasonal characteristics of phytoplankton bloom phenology in the northern Benguela Upwelling System
… and 70 NM stations) as well as OC-CCI satellite ocean colour data to investigate seasonal phytoplankton bloom phenology and community structure of diatoms, dinoflagellates and coccolithophores in the northern BUS. The seasonal cycle of satellite chlorophyll was used to determine the timing of …
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Phytoplankton community structure determined through remote sensing and in situ optical measurements
… use of the vast resource that is the satellite ocean colour archive. Detection of species, functional types or size classes has been addressed through a spectrum of empirical to analytical approaches. A key step in developing these techniques is quantifying the sensitivity in reflectance, which …
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Identification and characterisation of submesoscale activity over the continental shelf in the Bay of Biscay
… of remotely sensed images (high resolution ocean colour MODIS 800m) of Chlorophyll-α concentration, Sea Surface Temperature and Suspended Particulate Matter in view of identifying and characterizing submesoscale activity developing in the vicinity of the Loire River. A 10-year dataset …
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A bio-optical approach to phytoplankton community sturcture, physiology and primary production on the Weddell Gyre
The Southern Ocean is an important “sink” for anthropogenic CO2, but it requires a detailed understanding of the sensitivity of the biological carbon pump to variability in physical forcing mechanisms in order to predict its continuing role. However, due to the remote and tempestuous nature of this …
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The use of reflectance classification for chlorophyll algorithm application across multiple optical water types in South African coastal waters
Ocean colour remote sensing is a valuable tool for deriving information about key biogeochemical variables over inland, coastal and ocean waters at scales unachievable via in situ techniques. However, broader use of ocean colour data is still limited by the need for users to choose among a …
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Characterisation of CMOS APS Technologies for Space Applications
… of the device is measured and compared to the Ocean Colour Imager APS test array showing progress towards a high frame rate spectroscopic X-ray imager for space science. The implications of these results for using similar devices in space applications are considered. Furthermore, possible novel …
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Dynamics, interactions and ecosystem implications of mesoscale eddies formed in the southern region of Madagascar
… and satellite remote sensing observations of ocean colour, it is shown that chlorophyll-a rich waters are entrained within the eddies, and these waters are mostly conserved during their passage across the channel. This study suggests that biota may be transported from Madagascar to Africa in …
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Utilising Chlorophyll Fluorescence to Assess the Variability of Phytoplankton Biomass and Productivity in the North-West European Shelf Seas
… variability in phytoplankton distribution, but ocean colour estimates lose accuracy in highly heterogenous conditions. This thesis provides a step towards capturing the extent of spatial and temporal variability in phytoplankton stocks and rates in temperate shelf seas, in part, by providing a …
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Cellular viability and the occurence and significance of chlorophyll allomers during phytoplankton turnover.
… cells can contain chlorophyll and contribute to ocean colour, and hence estimates of oceanic primary productivity. The aim of this project was to assess indicators of phytoplankton physiological state, focusing on the formation of chlorophyll a oxidation products (allomers) and a chlorophyll …
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Protection and management of marine areas in the Mediterranean Sea: applications of satellite remote sensing
… in Mediterranean MPAs. Observations retrieved by ocean colour and thermal infra-red sensors, for a range of MPA study sites, were used to depict system functioning by the analysis of the prevailing spatial and temporal variations of the geophysical parameters and biophysical conditions. The …
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A novel approach to investigating chlorophyll-a fluorescence quantum yield variability in the Southern Ocean
… field stations, sampled in the Atlantic Southern Ocean during the austral winter of 2012 and summer of 2013/ 2014. Phytoplankton pigments, macronutrient concentrations, and light levels were simultaneously measured to investigate their influence on ΦF . While no relationship was observed between …
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Determining potential for pollutant impacts in dynamic coastal waters: comparing morphological settings
… of New South Wales is discharged directly to the ocean. The dispersion and fate of waterborne pollutants and their potential to impact coastal ecosystems are fundamentally determined by the dynamics of the coastal boundary layer (CBL). This turbulent interface between the coastline and the deep …
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