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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 33 for “"sediment trap"”.
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Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap
… was examined in the Sea of Okhotsk, using sediment trap samples (trap deployed Aug. '90 - Aug. '91; 53°19'N, 149°50'E) and AVHRR satellite sea surface temperature data. Synoptic SST's for the deployment ranged between -1.2 and 14.8°C. Two species dominated total yearly foraminiferal flux: …
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Deciphering isotopic signals of monsoon-induced upwelling in foraminifera from the Western Arabian sea sediment trap
… of foraminifera collected with a PARFLUX Mark VI sediment trap in the Arabian Sea during the 1986 and 1987 monsoons. Two of the species are non-spinose thermocline dwellers (Neogloboquadrina dutertrei, Globorotalia menardii) and two are spinose surface dwellers (Globigerinoides sacculifer, …
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Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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Deciphering isotopic signals of monsoon-induced upwelling in foraminifera from the Western Arabian sea sediment trap
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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Insights Into Particulate Phosphorus Dynamics and toxic Algal Bloom Events From A 13-Year Sediment Trap Study In Santa Barbara Basin (CA)
… continuously collected at ~500 m depth by a sediment trap deployed in Santa Barbara Basin (SBB) off the coast of southern California. Sampling included analysis of overlying solutions within sediment trap cups and therefore a detailed examination of possible diagenetic artifacts associated …
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Particulate fluxes in the subtropical convergence region and other marine environments of New Zealand
… thesis was designed to address two themes: (1) sediment trap methods and technique development; and (2) oceanic sediment fluxes within the Chatham Rise-Subtropical Convergence ecosystem, east of New Zealand. Accordingly, the principal objectives of Theme 1 were to design, construct and deploy a …
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Transformations of carotenoids in the oceanic water column
… of the material. The carotenoid distribution of sediment trap samples collected in these same areas was dominated by transformation products. Fucoxanthin, the primary carotenoid of marine diatoms, typically constituted 77-100% of the total fucopigments in suspended particulate material. In …
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Particle flux in the Western Black Sea in the present and over the last 5,000 years : temporal variability, sources, transport mechanisms
… comparative study with samples from time-series sediment traps and laminated core sediments. The sediment trap samples were collected in the southwestern Black Sea over 2 1/2 years at sampling intervals of about two weeks. Sediment core samples were derived from the central part of the western …
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Hydroclimatic influences on suspended sediment delivery in a small, High Arctic catchment
A study of suspended sediment transport dynamics was undertaken in the West River at Cape Bounty, Melville Island, Nunavut. Hydrometerological conditions and sediment transport were measured over three seasons in order to characterize suspended sediment transport and grain size characteristics in …
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Improved dynamics modelling for drainage sediment prediction and management
… in this thesis aims to further knowledge of sediment behaviour and provides engineers with appropriate tools and methods to facilitate proactive sediment management. The techniques developed during this investigation are therefore able to predict the locations and quantities of sediment …
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East African monsoon variability since the last glacial
… we report records from a laminated lake sediment core spanning the last 25,000 years. Analyzing a monthly cleared sediment trap confirms the annual origin of the laminations and demonstrates that the varve-thicknesses are strongly linked to the duration and strength of the windy season. …
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Chlorophyll diagenesis in the water column and sediments of the Black Sea
… of chlorophyll in the Black Sea water column and sediments. Measurements are made of total chlorophyll in sediment traps from two locations and depths in the water column, and at two locations in surface sediments. Individual chlorophyll degradation products are also identified. This data is used …
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Composition and characteristics of particles in the ocean : evidence for present day resuspension
… in the water column and the underlying surface sediments verifies the occurrence of local, present-day resuspension in the deep sea. The location of the major portion of this work was the South Iceland Rise, a region influenced by the flow of Norwegian Sea Overflow Water. Measured current …
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The marine geochemistry of thorium and protactinium
Suspended particulate matter was collected by sediment traps deployed in the Sargasso Sea (Site S2), the north equatorial Atlantic (Site E), the north equatorial Pacific (Site P), and the Panama Basin (STIE Site). Additional samples of suspended particles were obtained by in situ filtration at Site …
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Tracking Changes In Silicon Isotopic Composition During Diatom Descent and Dissolution In the Cariaco Basin.
… The Cariaco Basin time series consists of four sediment traps at progressively greater depths on a single mooring and monthly hydrographic and dissolved nutrient measurements within the water column. Monthly measurements of diatom δ<super>30</super>Si from sediment traps between 225-m and 1200-m …
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Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers
… of multiple gas tracer, incubation, and sediment trap-based productivity estimates in the coastal ocean. Net community production estimated from 15NO –3 uptake and O2/Ar gave equivalent results at steady state. Underway O2/Ar measurements revealed submesoscale variability that was not …
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THE CARBON DYNAMICS OF CONTRASTING FRESHWATER PONDS
… were sampled by loss-on-ignition analysis of sediment-trap contents. Decomposition-rates were also measured (by QMS) at successive depths in sediment-cores collected from each site. Loss-on-ignition was conducted to determine depth-related carbon-content and bulk-density increase, inferring …
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Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers
… of multiple gas tracer, incubation, and sediment trap-based productivity estimates in the coastal ocean. Net community production estimated from ¹⁵NO₃⁻ uptake and 02 /Ar gave equivalent results at steady state. Underway O₂/Ar measurements revealed submesoscale variability that was not …
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Satellite-derived sea surface temperature, mesoscale variability, and foraminiferal production in the North Atlantic
… foraminiferal flux was collected at four sediment trap locations spanning a 34° latitude range in the North Atlantic during 1988-1990. Satellite-derived sea surface temperature (SST) and CTD data were integrated with time-corrected flux data to determine the effects of seasonal …
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Microbial responses to environmental forcing and implications for trophic transfer through the lens of lipidomics
… on ocean biogeochemistry. Lipidomic analysis of sediment trap material showed the export of particulate organic carbon (POC) enriched in the energy storage molecule, triacyglyceride (TAG), from the cyclonic eddy despite similar total fluxes of POC from both eddy systems (cyclone and anticyclone). …
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