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Wednesday, July 29, 2020 | History

1 edition of Atmospheric turbulence measurements in marine fog during CEWCOM-76 found in the catalog.

Atmospheric turbulence measurements in marine fog during CEWCOM-76

C. W. Fairall

Atmospheric turbulence measurements in marine fog during CEWCOM-76

by C. W. Fairall

  • 111 Want to read
  • 21 Currently reading

Published by Naval Postgraduate School in Monterey, Calif .
Written in English

    Subjects:
  • Boundary layer (Meteorology),
  • Measurement,
  • Fog,
  • Atmospheric turbulence,
  • Ocean-atmosphere interaction

  • About the Edition

    Atmospheric turbulence parameters epsilon (turbulent energy dissipation rate), and C sub T squared (temperature structure function) were measured in the marine boundary layer during the Cooperative Experiment for West Coast Oceanography and Meteorology (CEWCOM-76). The atmospheric stability was characterized by measurements of profiles of mean wind velocity, temperature and relative humidity. This paper will focus on turbulence properties and turbulent heat flux measured during four marine fog events. The fogs were characterized by a slightly unstable boundary layer with moderate increases of heat flux during the fog. An ensemble average of the fog events showed that C sub T squared and epsilon reached peak values immediately before and after the fog was encountered. An analysis of the dimensionless temperature structure function C sub T squared normalized by the square of the temperature gradient) gave lower values of temperature fluctuations in fog than in clear air.

    Edition Notes

    Statementby C.W. Fairall, K.L. Davidson, T.M. Houlihan, and G.E. Schacher
    ContributionsDavidson, Kenneth L., Houlihan, Thomas M., Schacher, G. E. (Gordon Everett), Naval Postgraduate School (U.S.)
    The Physical Object
    Pagination61 p. :
    Number of Pages61
    ID Numbers
    Open LibraryOL25509320M
    OCLC/WorldCa417662776

    Meteorology is a branch of the atmospheric sciences which includes atmospheric chemistry and atmospheric physics, with a major focus on weather study of meteorology dates back millennia, though significant progress in meteorology did not occur until the 18th 19th century saw modest progress in the field after weather observation networks were formed across broad. Fog resulting from the transport of warm, humid air over a cold surface. A true measure of the intensity of atmospheric turbulence. EDR is a metric that depends on the nature of the turbulence rather than on the aircraft response to the turbulence; that is, it is aircraft-independent. The amount of heat absorbed or released during a.

    1. Atmospheric Boundary layer Angela Colbert, 2. Introduction to ABL - Dr. Holmes 3. Atmospheric turbulence heat fluxes and Planetary BL 4. Atmospheric Turbulence I & II lecture by Dr. J.D. Holmes 5. Modeling the Atmospheric Boundary layer 6. Observations and Models of Boundary-Layer Processes Over Complex Terrain Don Lenschow, 7.   Adverse weather influences in marine conditions are analyzed in [90,91,92,93] for maritime conditions, desert conditions, and heavy fog. Atmospheric transmission influence on IR temperature measurements is presented in [26,28], and thermal imager application in civil aviation.

      / Steve Hammel, Alexander van Eijk, and Dimitri Tsintikidis --Surface wave effects on long range IR imaging in the marine surface layer / M.J. Francius, G.J. Kunz, and A.M.J. van Eijk --Measurement of Light attenuation in dense fog conditions for FSO applications / M. Gebhart --Visibility measurements along extended paths over the ocean surface. Scribd es el sitio social de lectura y editoriales más grande del mundo.


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Atmospheric turbulence measurements in marine fog during CEWCOM-76 by C. W. Fairall Download PDF EPUB FB2

Atmospheric turbulence parameters epsilon (turbulent energy dissipation rate), and C sub T squared (temperature structure function) were measured in the marine.

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Atmospheric turbulence parameters epsilon (turbulent energy dissipation rate), and C sub T squared (temperature structure function) were measured in the marine boundary layer during the Cooperative Experiment for West Coast Oceanography and Meteorology (CEWCOM).

Fairall, K. Davidson, T. Houlihan, and G. Schacher, “Atmospheric Turbulence Measurements in Marine Fog During CEWCOM‐76,” NPS‐61‐77‐ ().Cited by: 3. The dc calibration parameters of hot wires used for wind speed measurements and cold wires used for air temperature measurements have been investigated for wires used in the marine environment.

Tungsten hot wires and platinum temperature wires have been calibrated both before, during, and after their use at sea. A scanning electron microscope has been used to determine the Cited by: 7.

where k is the wave number. This model takes into account of the turbulence strength profile c n, i 2 for each ith intervals along the slant path using the Hufnagel-Valley model (HV model) [4] and for jth path length of path L the UAV cruising at a fixed altitude h, the propagation distance L j = h/sinθ j where θ is the time-varying angle between the transmitter and the receiver.

Small-scale turbulence has an essential role in sea-fog formation and evolution, but is not completely understood. This study analyzes measurements of the small-scale turbulence, together with the boundary layer structure and the synoptic and mesoscale conditions over the life cycle of a cold advection fog event and a warm advection fog event, both off the coast of southern China.

The turbulent kinetic energy, friction velocity, atmospheric stability, and fog DSD evolve differently during the various stages (Liu et al.,Price,Terradellas et al., ). Within a radiation fog layer, temperature convergence is commonly observed, as well as weakly unstable stratification and increased turbulence (Price, Different methods have been developed to estimate the fog-top height of radiation fog and evaluated using the measurements obtained from a m meteorological tower located in Tianjin in Different indicators of turbulence intensity, friction velocity (u*), turbulence kinetic energy (TKE), and variance of vertical velocity (σw2) were used to estimate the fog-top height, respectively.

This review paper summarizes current knowledge available for aviation operations related to meteorology and provides suggestions for necessary improvements in the measurement and prediction of weather-related parameters, new physical methods for numerical weather predictions (NWP), and next-generation integrated systems.

Severe weather can disrupt aviation operations on. Radiosondes Measure Atmospheric Turbulence Over North America. Research Spotlight—The tule fog in California’s Central Valley is notorious for causing delays and accidents throughout the region; however, a decrease in air pollutants is reducing the fog’s frequency.

Research Spotlight —Measurements made during a field campaign in. A limited number of in situ measurements of Cn2 made during day and night conditions from the surface to 10 km above sea level are compared in three different atmospheric boundary layer.

Clouds are known to be turbulent, but the details of their internal turbulent structure have been largely unexplored. Measurements of turbulent velocities in stratocumulus clouds. In this study, a marine fog episode at King George Island off the Antarctic Peninsula from 26–30 January was investigated using surface observations, upper-air soundings, and re-analysis data as well as the air mass backward trajectory method.

The marine fog episode resulted from an approaching low-pressure system, was maintained at high wind speeds, and quickly dissipated when the low. Speckle turbulence interaction has the potential for allowing single ended remote sensing of the path averaged vector crosswind in a plane perpendicular to the line of sight to a target.

'Stull's book is destined to be the overwhelmingly favorite text and general reference in atmospheric turbulence and boundary layer physics during thes'. (AMS Bulletin, ) '. a good introductory textbook which is likely to be well used in the coming years.' (Quarterly Journal of the Royal Meteorological Society).

•Analysis provides hemispheric records of atmospheric COS that display large increases through the first 70‐80 years of the 20th century. •Model results suggest anthropogenic emissions are the primary driver of decadal changes in atmospheric COS levels during the study period.

Observations of marine stratocumulus obtained by three research aircraft during the JASIN experiment are presented.

Detailed measurements were made of the thermodynamic, cloud physics and radiation fields. These showed an essentially well‐mixed boundary layer with cloud liquid water contents close to their adiabatic values.

The Shipboard Use of a Low-Level Atmospheric Thermograph in Fog and Stratus Investigations J. Norton1 and G. Schacher2 3 Fairall et al., Atmospheric turbulence measurements in marine fog during CEWCOM Naval Postgraduate School, NPS 4 Peterson, C.

H.,Fog sequences on the central Cali from the spool during. Measurements of the atmospheric turbulence spectrum and intermittency using laser scintillation Rod G.

Frehlich Proc. SPIEPropagation Engineering: Fourth in a Series, pg 10 (1 July ); doi: /. Weilin "Will" Hou is an oceanographer at the U.

S. Naval Research Laboratory, and leads the Hydro Optics, Sensors and Systems Section. He received his PhD from the College of Marine Science, University of South Florida in His research interests spans from sensing, to communication, to decision involving data processing and fusion.Atmospheric Optical Modeling, Measurement, and Simulation II.

Editor(s): Using historic models of C n 2 to predict r 0 and regimes affected by atmospheric turbulence for horizontal, slant, and topological paths Results of attenuation measurements for optical wireless channels under dense fog conditions regarding different wavelengths.Atmospheric Propagation V Editor(s): G.

Charmaine Gilbreath ; Linda M. Wasiczko For the purchase of this volume in printed format, please visit