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 19 of 19 for “"seawifs"”.
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Qualitative and quantitative analyses of Lake Baikal's surface-waters using ocean colour satellite data (SeaWiFS)
… using spatial and seasonal information from the SeaWiFS satellite (NASA). From this, the SeaWiFS study evolved to become the first efficient bio-optical satellite study of Lake Baikal. During the course of three years, field work including spectral field measurements and water sampling, was …
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Specific applications of satelite remote sensing to the Benguela ecosystem
… data, from the NOAA AVHRR and OrbView-2 SeaWiFS sensors, to investigate the upper layer dynamics of the Benguela ecosystem in more detailed space and time scales than previously undertaken. The standard for SeaWiFS bio-optical algorithms and processing parameters are not ideal for the …
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Development of bio-optical algorithms to estimate chlorophyll in the Great Salt Lake and New England lakes using in situ hyperspectral measurements
… to mimic bands utilized by the MODIS, MERIS, and SeaWiFS sensors, as well as for a theoretical hyperspectral sensor with 3-nm wide bands, providing the capability to evaluate algorithm performance in all of these sensors. In addition to the traditional bands used in these algorithms, alternate …
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Quantitative Mapping of Cyanobacterial Blooms Using Oceansat-1 OCM Satellite Data
… to Sea-viewing Wide Field-of-View Sensor (SeaWiFS) but with higher spatial resolution. However, OCM does not have a standard atmospheric correction procedure and the comprehensive suite of atmospheric correction procedures for ocean (or lake) is not available in the literature in one place. …
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Seasonal and inter-annual variability of SST and chlorophyll-a off Angola
… data were from a 5-day composite of SeaWiFS GAC (4.5 km 'Global Area Coverage') images. Such images were available on a format comparable with the Meteosat SST composite images and covered the period 1998 to 2004.
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Physical controls on spring bloom dynamics in the Irminger Basin, North Atlantic
… This data set is extended with six years of SeaWiFS satellite chlorophyll-a concentration (chl-a) data, together with the corresponding model net heat flux (NCEP reanalysis) and satellite measured wind speed (QuikSCAT), sea surface temperature (SST; AVHRR) and photosynthetically available …
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Physical Control of Biological Processes in the Central Equatorial Pacific: A Data Assimilative Modeling Study
… data, as are currently available from SeaWiFS, additionally requires a small amount of supplemental <em>in situ</em>nutrient data. As expected, deterioration in simulation skill is more severe when assimilating biased data, as compared to data containing random noise.</p> <p>When actual …
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Inter-annual and decadal variation in the pelagic marine ecosystem of the Yellow and East China seas
… and the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) were compared to investigate decadal trends in the Yellow and East China Seas (YECS). A unified bio-optical algorithm was derived to convert CZCS pigments to SeaWiFS chlorophyll concentrations. The conversion is applied to level-2 CZCS …
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Links between the Seychelles-Chagos thermocline ridge and large scale climate modes and primary productivity; and the annual cycle of chlorophyll-a
… pumping. Sea-viewing Wide Field-of-view Sensor (SeaWiFS) has shown high variability of surface chlorophyll-a (SChl-a) in the SCTR region. The Indian Ocean Dipole (IOD) and El Niño Southern Oscillation (ENSO) have also driven significant interannual variation of the depth of 20°C isotherm (D20) …
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Substanzspezifische Analyse spektraler Attenuationskoeffizienten und ihr Einfluß auf das Strahlungsfeld im Meer
… Diese Satelliten, wie zum Beispiel MOS und SeaWiFS, bestimmen die Reflektivität eines Wasserkörpers, sie sollen unter anderem helfen, den CO2 Haushalt des Ozeans zu verstehen. Ziel dieser Arbeit ist die Entwicklung eines Gerätes zur Messung der multispektralen Attenuationskoeffizienten. Die …
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A satellite view of the space-time variability of phytoplankton biomass in the Mediterranean Sea
… Mediterranean Sea (MED) using satellite data (SeaWiFS), at different timescales, and their relationship with the physical environment. A validation exercise was performed over SeaWiFS data in the context of the reliability of both oceanic and atmospheric remote sensing data, and using the most …
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Exploration of Biophysical Interactions Associated with Mesoscale Variability in the Central Gulf of Mexico
… as ocean color identified by the satellites SeaWiFS and MODISA. A climatology data set and a chlorophyll anomaly (CLa) was made using the 14-year mean determined from the ocean color files. The hypotheses are that there will be an inverse relationship between SLa and CLa, that mesoscale SLa …
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Variations in modelled and measured hyperspectral remote sensing reflectance
… water. All the chlorophyll algorithms tested (SeaWiFS OC4V4, MODIS Chlor_a_2 and Chlor_a_3, and MERIS OC4E) overestimated the values measured in situ. The MODIS algorithm for absorption by phytoplankton, αphyto(675), performed poorly, but the MODIS algorithm for the absorption by coloured …
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Spatio-Temporal Dynamics Of Phytoplankton Biomass From Ocean Color Remote Sensing And Cmip5 Model Suites
… on the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) mission period (1997-2010). In Chapter 2 we found phytoplankton biomass increases in the warm ocean regions over this period, opposing common expectations of decreases in warming oceans. Biomass increases are due to increased physical …
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Mechanisms of Interactions between Aerosol Physics and Atmospheric Dynamics
… satellite observations data sets, such as MODIS, SeaWiFS and TRMM as well as GOCART aerosol model and MERRA reanalysis indicates that the suggested results are consistent regardless of the selected data sets. Overall, we proposed that the regional radiative properties of aerosols and …
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An investigation of factors influencing the spatial and temporal distribution of surface phytoplankton in the English Channel and Bay of Biscay in 2003 and 2004
… images for estimates of chlorophyll (SeaWIFS), zooplankton abundance from<br/>CPR (Continuous Plankton Recorder) tows, wind speed and direction and irradiance.<br/>This has enabled phytoplankton populations to be related to-: (1) nutrient supply (2)<br/>grazing pressure (3) fresh water …
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Aplicación de satélites oceanográficos al estudio del impacto del cambio global sobre los ecosistemas pelágicos del Atlántico Norte
… datos procedentes de distintos sensores (SeaWiFS y MODIS). En último lugar, se analizó el colapso de la pesquería de anchoa del Cantábrico combinando técnicas de modelado de poblaciones con una cuidadosa caracterización de los cambios en ambientales en el golfo de Vizcaya basado …
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The Observation, Modeling, and Retrieval of Bio-Optical Properties for Coastal Waters of the Southern Chesapeake Bay
… Ed</em>with RMS error from 10% to 14%. The SeaWiFS imagery of the diffuse attenuation coefficient (<em>K<sub>d</sub></em>) estimated from PZ06_<em>E<sub>d</sub></em> is significantly improved from the <em>Mueller</em> [2000] model and displays obviously the coastal processes in the lower …
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Nanosatellite Hyperspectral Imaging Performance Modeling for Ocean Color Detection.
… legacy instruments such as MODIS, MERIS, and SeaWiFS. Data coverage without temporal gaps is necessary for monitoring short- and long-term trends, and high spectral resolution is required for taxonomic species discrimination and identification of in-water optical constituents in turbid, …