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  • 1
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    Relationship between sea ice freeboard and draft in the Arctic Basin, and implications for ice thickness monitoring (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This study confirms the finding of Comiso et al. (1991) that the probability density function (pdf) of the ice freeboard in the Arctic Ocean can be converted to a pdf of ice draft by applying a simple coordinate factor. The coordinate factor, R, which is the ratio of mean draft to mean freeboard pdf is related to the mean material (ice plus snow) density, rho(m), and the near-surface water density rho(w) by the relationship R = rho(m)/(rho(w) - rho(m)). The measured value of R was applied to each of six 50-km sections north of Greenland of a joint airborne laser and submarine sonar profile obtained along nearly coincident tracks from the Arctic Basin north of Greenland and was found to be consistent over all sections tested, despite differences in the ice regime. This indicates that a single value of R might be used for measurements done in this season of the year. The mean value R from all six sections was found to be 7.89.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; C12; p. 20,325-20,334.
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  • 2
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    Results of the telstar satellite space experiments (1963)
    In:  CASI
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    Publication Date: 2006-10-26
    Description: Orbital element, power level of satellite signal, & electrical circuit behavior of telstar satellite in space environment
    Keywords: SPACE RADIATION
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  • 3
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    The spacecraft test and evaluation program (1963)
    In:  CASI
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    Publication Date: 2006-10-26
    Description: Telstar satellite test and evaluation program
    Keywords: SPACE SCIENCES
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  • 4
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    Active-passive correlation spectroscopy - A new technique for identifying ocean color algorithm spectral regions (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A new active-passive airborne data correlation technique has been developed which allows the validation of existing in-water oceoan color algorithms and the rapid search, identification, and evaluation of new sensor band locations and algorithm wavelength intervals. Thus far, applied only in conjunction with the spectral curvature algorithm (SCA), the active-passive correlation spectroscopy (APCS) technique shows that (1) the usual 490-nm (center-band) chlorophyll SCA could satisfactorily be placed anywhere within the nominal 460-510-nm interval, and (2) two other spectral regions, 645-660 and 680-695 nm, show considerable promise for chlorophyll pigment measurement. Additionally, the APCS method reveals potentially useful wavelength regions (at 600 and about 670 nm) of very low chlorophyll-in-water spectral curvature into which accessory pigment algorithms for phycoerythrin might be carefully positioned. In combination, the APCS and SCA methods strongly suggest that significant information content resides within the seemingly featureless ocean color spectrum.
    Keywords: OCEANOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 25; 2571-258
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  • 5
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    Elimination of directional wave spectrum contamination from noise in elevation measurements (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The Surface Contour Radar (SCR) is a 36-GHz computer-controlled airborne radar which generates a false-color-coded elevation map of the sea surface below the aircraft in real time, and can routinely produce ocean directional wave spectra with post-flight data processing which have much higher angular resolution than pitch-and-roll buoys. The SCR range measurements are not error-free and the resulting errors in the elevations corrupt the directional wave spectrum. This paper presents a technique for eliminating that contamination.
    Keywords: AIRCRAFT INSTRUMENTATION
    Type: IEEE Journal of Oceanic Engineering (ISSN 0364-9059); OE-10; 376-381
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  • 6
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    Observations of and a new model for fetch-limited wave growth (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The Surface Contour Radar (SCR) is a 36-GHz computer-controlled airborne radar which generates a false-color coded elevation map of the sea surface below the aircraft in real time. In the present paper, SCR observations are discussed which demonstrate the existence of a full developed sea state. These observations are used to judge the validity of growth rates for fetch-limited wave spectrum development and lead to new refinements in the modeling of wave generation by wind. It is noted that the observations have resolved an apparent paradox in the JONSWAP and Donelan et al. (1985) fetch-limited algorithms.
    Keywords: OCEANOGRAPHY
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  • 7
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    Airborne detection of oceanic turbidity cell structure using depth-resolved laser-induced water Raman backscatter (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Airborne laser-induced, depth-resolved water Raman backscatter is useful in the detection and mapping of water optical transmission variations. This test, together with other field experiments, has identified the need for additional field experiments to resolve the degree of the contribution to the depth-resolved, Raman-backscattered signal waveform that is due to (1) sea surface height or elevation probability density; (2) off-nadir laser beam angle relative to the mean sea surface; and (3) the Gelbstoff fluorescence background, and the analytical techniques required to remove it. When converted to along-track profiles, the waveforms obtained reveal cells of a decreased Raman backscatter superimposed on an overall trend of monotonically decreasing water column optical transmission.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 22; 3778-378
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  • 8
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    Energy dependence of the 4610- and 4765-A lines of Ar/plus/ excited in low-energy He/plus/ plus Ar collisions (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Energy dependence and threshold behavior of ion Ar lines excited in low-energy He ion-Ar collisions
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: ; ADEMIE DES SCIENCES
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  • 9
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    Absolute tracer dye concentration using airborne laser-induced water Raman backscatter (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The use of simultaneous airborne-laser-induced dye fluorescence and water Raman backscatter to measure the absolute concentration of an ocean-dispersed tracer dye is discussed. Theoretical considerations of the calculation of dye concentration by the numerical comparison of airborne laser-induced fluorescence spectra with laboratory spectra for known dye concentrations using the 3400/cm OH-stretch water Raman scatter as a calibration signal are presented which show that minimum errors are obtained and no data concerning water mass transmission properties are required when the laser wavelength is chosen to yield a Raman signal near the dye emission band. Results of field experiments conducted with an airborne conical scan lidar over a site in New York Bight into which rhodamine dye had been injected in a study of oil spill dispersion are then indicated which resulted in a contour map of dye concentrations, with a minimum detectable dye concentration of approximately 2 ppb by weight.
    Keywords: OCEANOGRAPHY
    Type: Applied Optics; 20; Apr. 1
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  • 10
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    Oil film thickness measurement using airborne laser-induced water Raman backscatter (1980)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The use of laser-induced water Raman backscatter for remote thin oil film detection and thickness measurement is reported here for the first time. A 337.1-nm nitrogen laser was used to excite the 3400-cm-1 OH stretch band of natural ocean water beneath the oil slick from an altitude of 150 m. The signal strength of the 381-nm water Raman backscatter was always observed to depress when the oil was encountered and then return to its original undepressed value after complete aircraft traversal of the floating slick. After removal of background and oil fluorescence contributions, the ratio of the depressed-to-undepressed airborne water Raman signal intensities, together with laboratory measured oil extinction coefficients, is used to calculate the oil film thickness.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 19; Oct. 1
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