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  • INSTRUMENTATION AND PHOTOGRAPHY  (13)
  • METEOROLOGY AND CLIMATOLOGY  (9)
  • 1
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    Post World War II trends in tropical Pacific surface trades (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Multidecadal time series of surface winds from central tropical Pacific islands are used to compute trends in the trade winds between the end of WWII and 1985. Over this period, averaged over the whole region, there is no statistically significant trend in speed or zonal or meridional wind (or pseudostress). However, there is some tendency, within a few degrees of the equator, toward weakening of the easterlies and increased meridional flow toward the equator. Anomalous conditions subsequent to the 1972-73 ENSO event make a considerable contribution to the long-term trends. The period 1974-80 has been noted previously to have been anomalous, and trends over that period are sharply greater than those over the longer records.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Climate (ISSN 0894-8755); 2; 1561-156
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    NASA TECHNICAL REPORTS
  • 2
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    A diode-quad bridge circuit for use with capacitance transducers (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 44; Oct. 197
    Format: text
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  • 3
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    Aspects of the Kelvin wave response to episodic wind forcing (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Episodes of westerly wind are an important aspect of surface stress variability in the western Pacific. During ENSO periods, the presence of such wind episodes comprises much of the LF relaxation of the trades over the central and western Pacific. This paper describes the oceanic Kelvin pulse response to a single idealized episode of westerly wind stress, using results from linear theory as well as from a 27-level general circulation model. When stratification typical of the western and eastern Pacific is used, the conservation of energy flux predicts a reduction of surface currents associated with the first baroclinic mode and an enhancement of surface currents associated with the second baroclinic mode. The idealized wind anomaly is also used to drive an ocean general circulation model. When the wind anomaly is weak, the model Kelvin response agrees with predictions of linear theory. For more realistic strong forcing there are three important deviations from linear theory: the amplitude of low baroclinic modes increases; the amplitude of higher baroclinic modes decreases; and the phase speed increases.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 7289-731
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    NASA TECHNICAL REPORTS
  • 4
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    Measurement of pressures and heat transfer by fm telemetry from free-flying models in hypersonic tunnel streams (1964)
    In:  Other Sources
    Details
    Publication Date: 2011-08-10
    Description: Pressure and heat transfer of models in free flight in hypersonic tunnel streams
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 5
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    Measurement of pressures and heat transfer by FM telemetry. (1966)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Pressure and heat transfer measurement by FM TELEMETRY for models flying freely in hypersonic wind tunnel streams
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 6
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    FM telemetry for multiple force measurements on free-flying models in wind tunnels. (1966)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Simultaneous FM telemetry measurement of four aerodynamic forces acting on free flying models in wind tunnel
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 7
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    FM telemetry and free-flight techniques for aerodynamic measurements in conventional wind tunnels (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Frequency modulated system to measure surface pressures on free flight models in conventional wind tunnels
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TN-D-3319
    Format: application/pdf
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  • 8
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    Ocean surface wind stress (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The need for improved surface wind and wind stress data is discussed. The collection of wind data using ship reports, research buoys, and cloud motion vectors is examined. The need for data on surface-wind stress fields is emphasized. Accurate stress data are required for studying: (1) the normal seasonal cycle and the intraannual events; (2) wind stress curls and the forcing of ocean circulation; (3) El Nino events; and (4) the low response of the midlatitude ocean circulation.
    Keywords: METEOROLOGY AND CLIMATOLOGY
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  • 9
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    The development of a power spectral density processor for C and L band airborne radar scatterometer sensor systems (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A real-time signal processor was developed for the NASA/JSC L-and C-band airborne radar scatterometer sensor systems. The purpose of the effort was to reduce ground data processing costs. Conversion of two quadrature channels of data (like and cross polarized) was made to obtain Power Spectral Density (PSD) values. A chirp-z transform (CZT) approach was used to filter the Doppler return signal and improved high frequency and angular resolution was realized. The processors have been tested with record signals and excellent results were obtained. CZT filtering can be readily applied to scatterometers operating at other wavelengths by altering the sample frequency. The design of the hardware and software and the results of the performance tests are described in detail.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-171668 , NAS 1.26:171668 , LEMSCO-19158
    Format: application/pdf
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  • 10
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    The appearance of sustained equatorial surface westerlies during the 1982 Pacific warm event (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In June 1982 a band of anomalous southerly surface wind, extending from the equator as far south as the Tasman Sea, formed east of Australia (150 deg E to 160 deg E). This flow crossed the equator just before the appearance of sustained westerly winds on the equator somewhat west of the date line. Because these westerly winds induced the initial strong equatorial warming of the ocean east of the date line during the 1982 El Nino-Southern Oscillation (ENSO) event, the southerly jet appears to be an important atmospheric component leading to the onset of the vigorous phase of this event. Some historical evidence suggests that anomalous southerly winds in the same region occurred prior to the appearance of sustained equatorial westerly winds in the major ENSO events of 1957, 1965, and 1972.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Science (ISSN 0036-8075); 224; 1099-110
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