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  • 1
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    Seasonality in the coastal ocean of North America, 35°N - 48°N [abstract] (2021)
    In:  http://aquaticcommons.org/id/eprint/14316 | 8 | 2014-01-27 21:48:30 | 14316
    Details
    Publication Date: 2021-07-10
    Description: EXTRACT (SEE PDF FOR FULL ABSTRACT):The seasonal cycles of coastal wind stress, adjusted sea level height (ASL), shelf currents and water temperatures off the west coast of North America (35°N to 48°N) were estimated by fitting annual and semiannual harmonics to data from 1981-1983. Longer records of monthly ASL indicate that these two harmonics adequately represent the long-term monthly average seasonal cycle, and that the current measurement period is long enough to define the seasonal cycles, with relatively small errors in magnitude and phase.
    Keywords: Atmospheric Sciences ; Oceanography ; PACLIM
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 23-24
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  • 2
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    Climatic factors associated with phytoplankton community succession during and after the 1977 drought for the San Francisco Bay-Delta Estuary [abstract] (2021)
    In:  http://aquaticcommons.org/id/eprint/14318 | 8 | 2014-12-10 23:37:25 | 14318
    Details
    Publication Date: 2021-07-10
    Description: Principal coordinates analysis and multiple regression analysis were used to determine the environmental factors associated with the decline in phytoplankton production during and after the 1977 drought for the San Francisco Bay-Delta Estuary. Physical, chemical and biological data were collected semimonthly or monthly during the spring-summer between 1973 and 1982 from 15 sampling sites located throughout the Bay-Delta. A decline in phytoplanktoncommunity diversity and density during the 1977 drought and subsequent years (1978 through 1981) was described using principal coordinates analysis. The best multiple regression which described the changes in phytoplankton community succession contained the variables water temperature, wind velocity and ortho-phosphateconcentration. Together these variables accounted for 61 percent of the variation in the phytoplankton community among years described by principal coordinates analysis. An increase in water temperature, wind velocity and ortho-phosphate concentration within the Bay-Delta, beginning in June 1976 and continuing through 1981, was demonstrated using weighted moving averages. From the strong association between phytoplankton community succession and climatic variables it was hypothesized that the decline in phytoplankton production during and after the 1977 drought was associated with climatic changes within the northeast Pacific.
    Keywords: Ecology ; Environment ; Limnology ; Oceanography ; PACLIM
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 25-25
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  • 3
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    Multibeam surveys - Ulithi Atoll and Yap Harbour, Yap State Federated States of Micronesia (2021)
    South Pacific Applied Geoscience Commission | Suva, Fiji
    In:  http://aquaticcommons.org/id/eprint/25859 | 20823 | 2018-10-11 09:32:49 | 25859 | South Pacific Applied Geoscience Commission
    Details
    Publication Date: 2022-09-13
    Description: Seabed mapping was completed using a Reson 8101 multibeam system to delineate the seabed morphology in the vicinity of the wreck USS Mississinewa located in water depths of around 40 m in Ulithi Atoll. A second area was mapped in Ulithi Atoll along the NE eastern margin of the lagoon from Masu to Asor island. Results of this mapping did not delineate any extraordinary feature other than the existing morphology of the seabed. The most interesting feature seen were elliptical-shaped mounds which may imply bi-directional bottom currents of similar magnitudes. The mapping of Yap harbour was also completed. These results have been presented in map form as contours and as soundings. The results of the mapping for Yap and Ulithi are available in GIS format. Digital side-scan imagery for all surveyed lines for both Ulithi and Yap harbour were collected and is presently only archived for processing should this facility become available. Conclusions are: The dataset for Ulithi lagoon provides excellent baseline information for long-term assessment of the impacts of the wrecks on the environment. Detailed maps and visualisation of seabed wrecks provides an opportunity for tourism e.g. a potential dive sites. The completion of the multibeam survey of Yap harbour and approaches provides for excellent baseline data for future infrastructure development. Recommendations are: Updating of the existing topographic map for Yap to account for expanding infrastructure in Colonia harbour should be completed. The use of IKONOS imagery in GIS provides an immediate solution for new and up-to-date maps for development planning.
    Keywords: Oceanography
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 27pp.
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  • 4
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    NIGHTGLOW: An Instrument to Measure the Earth's Nighttime Ultraviolet Glow - Results from the First Engineering Flight (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: We have designed and built an instrument to measure and monitor the "nightglow" of the Earth's atmosphere in the near ultraviolet (NUV). In this paper we describe the design of this instrument, called NIGHTGLOW. NIGHTGLOW is designed to be flown-from a high altitude research balloon, and circumnavigate the globe. NIGHTGLOW is a NASA, University of Utah, and New Mexico State University project. A test flight took place from Palestine, Texas on July 5, 2000, lasting about 8 hours. The instrument performed well and landed safely in Stiles, Texas with little damage. The resulting measurements of the NUV nightglow are consistent with previous measurements from sounding rockets and balloons. The results will be presented and discussed.
    Keywords: Aerodynamics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Geometric Model for a Parametric Study of the Blended-Wing-Body Airplane (1996)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A parametric model is presented for the blended-wing-body airplane, one concept being proposed for the next generation of large subsonic transports. The model is defined in terms of a small set of parameters which facilitates analysis and optimization during the conceptual design process. The model is generated from a preliminary CAD geometry. From this geometry, airfoil cross sections are cut at selected locations and fitted with analytic curves. The airfoils are then used as boundaries for surfaces defined as the solution of partial differential equations. Both the airfoil curves and the surfaces are generated with free parameters selected to give a good representation of the original geometry. The original surface is compared with the parametric model, and solutions of the Euler equations for compressible flow are computed for both geometries. The parametric model is a good approximation of the CAD model and the computed solutions are qualitatively similar. An optimal NURBS approximation is constructed and can be used by a CAD model for further refinement or modification of the original geometry.
    Keywords: Aerodynamics
    Type: AIAA Paper 96-2416
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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