Estudo de ocorrência de dutos de evaporação na região oceânica ao largo do Estado do Rio Grande do Sul
AbstractThe purpose of this study is to analyze the occurrence of anomalous electromagnetic propagation conditions near the sea surface, caused by the presence of evaporation ducts offshore the coast of the state of Rio Grande do Sul. Meteorological and oceanographic features typically associated to surface layer conditions favorable for the formation of evaporation ducts will be investigated, aiming at the development of conceptual models applicable to that ocean region. It will be used a surface layer model, based on the Monin-Obukhov similarity theory. Refractivity profiles will be retrieved by applying this model to a data set collected by a mooring buoy offshore Rio Grande harbor. The results of the case study show that the evaporation duct thickness is modulated by conditions associated to the presence of a cold front in the region. That frontal system caused significant changes in the profiles of specific humidity in the surface layer. The propagation of electromagnetic waves in the range of VHF, UHF and microwaves, are usually affected by those changes. Therefore, the performance of radars and communication equipments operating in those frequencies will be affected too.
Bean, B. R.; E.J. Dutton. Radio Meteorology. [S.I.]: Dover
Publications, 1968. 435 pp.
Space and Naval Warfare Systems Center. Advanced
Refractive Effects Prediction System (AREPS). S.I. : U.S. Navy,
Director of Naval Oceanography and Meteorology. The Effects
of the Environment on Radio and Radar Wave Propagation.
UK:Ministry of Defence, 1984.
Patterson, W. L.. Integrated Reffractive Effects Prediction
System (IREPS). S.I: Naval Ocean Systems Center, 1990. 40 pp.
Arya, S. P. Introduction to Micrometeorology. [S.I.] :
Academic Press, 1988. 303 pp.
BABIN, S.M.; YOUNG, G.S. ; CARTON,J.A.. A New Model of
the Oceanic Evaporation Duct – Journal of Applied
Meteorology, 36, 1990. p.193-204.
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