Variability of refractivity in the surface layer
Mabey, Deborah L.
Davidson, Kenneth L.
MetadataShow full item record
The author and members of the Boundary Layer Studies Group collected atmospheric surface layer profile properties affecting RF propagation during the Roughness and Evaporation Duct experiment off the windward coast of Oahu. We measured temperature, humidity and pressure profiles from the surface and up to 100 m by multi-level buoy-mounted sensors and a rawinsonde attached to a kite flown from a small vessel. We obtained the profiles concurrently with S-, X- and Ku-Band propagation measurements along a 26-km path. Using existing surface-layer bulk models, profiles of the gradient of modified refractivity were computed from the buoy data at one level and compared with the actual values obtained from the kite and the buoy. The bulk estimates did not agree well with the buoy data within the lowest 5 m. The kite and buoy data did not show the strong gradients just above the surface that were expected from theory. This same effect was noted when the kite experiment was repeated over much colder water near San Diego, CA. A refractive model was not able to forecast the variability of measured RF propagation characteristics when driven with the merged kite and buoy data. Using bulk estimates did result in some forecast skill.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
A detailed study of advection sea fog formation to reduce the operational impacts along the Northern Gulf of Mexico King, Jason M. (Monterey California. Naval Postgraduate School, 2007-03);This study creates rules of thumb for forecasting advection sea fog development and dissipation along the Northern Gulf of Mexico for the months of December through March. Surface observations from Tyndall AFB, Destin-Fort ...
Gates, Dallas C.; Collins, Curtis A.; Margolina, Tetyana; Rago, Thomas A. (2021-04-01);Surface drift of eighty-nine undrogued RAFOS floats in the California Current System (CCS) has been studied to describe patterns of flotsam drift, its seasonal variability and predictability limitations. The floats were ...
Investigation of surface motion in solids caused by reflection of an intense acoustic pulse at a pressure release surface Dogusal, Mustafa (Monterey, California; Naval Postgraduate School, 1970-12);This work reports theoretical investigations of the surface motion in solids caused by reflection of an intense acoustic pulse at a pressure release surface done using the surface velocity reflection coefficient. A formula ...