Die Ausbreitung elektromagnetischer Wellen im cm- bis m-Band über dem Meer unter besonderer Berücksichtigung der meteorologischen Bedingungen in der maritimen Grenzschicht

Jeske, H.

doi:10.1515/9783111407043

Cited by 10 publications

(5 citation statements)

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“…NOAA data buoy 42003 is located in Marsden square 81 in the Gulf of Mexico. The air-sea temperature difference (ASTD) distribution for buoy 42003 is shown in Figure 3 Jeske [1965]. Figure 5 shows the duct height calculated from the model versus air-sea temperature difference, parametric in relative humidity for a sea-surface temperature of 15øC and various wind speeds commonly encountered in the open ocean.…”

Section: Climatological Air-sea Temperature Differencesmentioning

confidence: 99%

Practical application of an evaporation duct model

Paulus¹

1985

Radio Science

145

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The application of an evaporation duct model in operational and climatological assessments of propagation and the sensitivity of the model to meteorological measurements are examined. The unexpectedly frequent occurrence of evaporation duct heights greater than 40 m is related to thermally stable conditions in the atmospheric surface layer. The existence of stable conditions over the ocean is analyzed in terms of meteorological conditions and temperature measurement accuracies. Air‐sea temperature differences measured by transiting ships are found to be biased toward stable conditions. The evaporation duct model is shown to be sensitive to this bias and yields high duct heights that are not supported by propagation measurements. A modified duct height calculation is proposed and applied to a radiometeorological data set.

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Section: Climatological Air-sea Temperature Differencesmentioning

confidence: 99%

Practical application of an evaporation duct model

Paulus¹

1985

Radio Science

145

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“…In 1962 a thickness of 7 m was exceeded in 50 percent of all cases, a thickness of 14 m in 10 percent, and 19 m in 1 percent. This indicates that in the German Bight a marked influence is restricted to em and dm waves only [Jeske, 1965].…”

Section: Introductionmentioning

confidence: 93%

“…If we have greater deviations from the neutral equilibrium, it is better to work with more complicated models given in modern turbulence theory, for example, the models of Ellison-Panofsky or Monin-Obukhov [see Brocks, 1965;Jeske, 1965]. But for the purpose of the present contribution we take into account only the situations which do not show strong deviation from the adiabatic case (-0.02 ~ Ri1m ~ 0.002).…”

Section: Determination Of the Duct Thickness During The Transmission mentioning

confidence: 99%

“…Simultaneously with these field-strength experi-ments· [Brocks et al, 1958-64;Brocks, 1964;Jeske, 1965] a meteorological program is carried out to determine the refractive index structure in the area of the radio links in question. The low-level refractive index stratification-first of all characterized by the width of the evaporation duct-is derived from simple meteorological observations on board the light ship Elbe 1 (lying nearly in the middle of the paths) by use of the laws of the atmospheric boundary-layer theory.…”

Section: Introductionmentioning

confidence: 99%

“…These periods are characterized almost exclusively by a fast fading (like scatter fading) of alternating amplitudes (fading types A and B; amplitudes of type A are deeper than those of type B 214-685 0-66-3 891 [Brocks et al, 1958-64, Rept. 4;Jeske, 1965]). If the width of the duct decreases to zero, the dominating propagation mechanism in the largely turbulent atmosphere is a scatter mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Experiments on Duct Propagation Above the Sea With the Mode Theory of Booker and Walkinshaw

Jeske

Brocks

1966

Radio Science

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Experiments on tropospheric duct propagation above the sea are discussed, especially in comparison with the mode theory of Booker and Walkinshaw. While the salient features.of ducting processes are well described by this theory, we find no quantitative agreement between the observed and the theoretically predicted field-strength values. The main reason for this may be additional energy scatter in the maritime sublayer and at the irregularities of the upper and the lower boundary of the evaporation duct, which are not covered by theory.

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Propagation Effects Due to Specific Atmospheric Structures

Fengler

1976

Atmospheric Effects on Radar Target Identification and Imaging

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Die Ausbreitung elektromagnetischer Wellen im cm- bis m-Band über dem Meer unter besonderer Berücksichtigung der meteorologischen Bedingungen in der maritimen Grenzschicht

Cited by 10 publications

References 0 publications

Practical application of an evaporation duct model

Practical application of an evaporation duct model

Comparison of Experiments on Duct Propagation Above the Sea With the Mode Theory of Booker and Walkinshaw

Propagation Effects Due to Specific Atmospheric Structures

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