Modified-Dewan Optical Turbulence Parameterizations

Jackson, A J

doi:10.21236/ada432901

“…Here the factors (0.1) 4/3 10 Y (h) determine the outer scale of turbulence in a statistical manner. The function Y (h) is empirically related with the altitude-dependent wind shear S(h) and the lapse rate λ(h) as [114]…”

Section: Appendix B: Standard Atmospherementioning

confidence: 99%

Satellite-mediated quantum atmospheric links

Vasylyev

¹

,

Vogel

²

,

Moll

³

2019

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The establishment of quantum communication links over a global scale is enabled by satellite nodes. We examine the influence of Earth's atmosphere on the performance of quantum optical communication channels with emphasis on the downlink scenario. We derive the geometrical path length between a moving low Earth orbit satellite and an optical ground station as a function of the ground observer's zenith angle, his geographical latitude, and the meridian inclination angle of the satellite. We show that the signal distortions due to regular atmospheric refraction, atmospheric absorption, and turbulence have a strong dependence on the zenith angle. The observed saturation of transmittance fluctuations for large zenith angles is explained. The probability distribution of the transmittance for slant propagation paths is derived, which enables us to perform the security analysis of decoy state protocols implemented via satellite-mediated links.

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“…Here the factors (0.1) 4/3 10 Y (h) determine the outer scale of turbulence in a statistical manner. The function Y (h) is empirically related with the altitude-dependent wind shear S(h) and the lapse rate λ(h) as [114] Y…”

Section: Appendix D: Atmospheric Model Of Optical Turbulencementioning

confidence: 99%

Satellite-mediated quantum atmospheric links

Vasylyev,

Vogel,

Moll

2019

Preprint

0

View full text Add to dashboard Cite

The establishment of quantum communication links over a global scale is enabled by satellite nodes. We examine the influence of Earth's atmosphere on the performance of quantum optical communication channels with emphasis on the downlink scenario. We derive the geometrical path length between a moving low Earth orbit satellite and an optical ground station as a function of the ground observer's zenith angle, his geographical latitude, and the meridian inclination angle of the satellite. We show that the signal distortions due to regular atmospheric refraction, atmospheric absorption, and turbulence have a strong dependence on the zenith angle. The observed saturation of transmittance fluctuations for large zenith angles is explained. The probability distribution of the transmittance for slant propagation paths is derived, which enables us to perform the security analysis of decoy state protocols implemented via satellite-mediated links.

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“…So far, L 0 has been estimated at lengths varying between 1 and a few tens of meters. Jackson (2004) approximated L 0 in the lower troposphere from windshear (equation 10c in the report), and L 0 was estimated 8.8-9.3 m using our sounding results. In this study, we assigned L 0 ¼ 9 m and determined M 2 as follows:…”

Section: Appendixmentioning

confidence: 99%

Convective Boundary Layer above a Subtropical Island Observed by C-band Radar and Interpretation using a Cloud Resolving Model

Minda

¹

,

Furuzawa

²

,

Satoh

³

et al. 2010

Journal of the Meteorological Society of Japan

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This paper describes the evolution of the convective boundary layer (CBL) and the initiation of clouds above Okinawa Island, Japan, during summer conditions with weak synoptic forcing and clear skies. An intensive observational campaign using a C-band precipitation radar (COBRA) and radio sonde was conducted on the island in early July 2005. These soundings exhibited diurnal variations in the potential temperature and water vapor in the atmospheric boundary layer. COBRA observed clear-air radar echoes (CAEs) within a 10-km radar range, and the CAE height showed a diurnal variation as well. To investigate the nature of the CAEs and to describe the dynamics of the CBL structure, a high-resolution cloud resolving model simulation was performed for two cases; a cumulus street and a distinct roll cloud. Flat and undulated surface models were used to understand the orographic e¤ects on cloud initiation. On the basis of these investigations, we found strong consistency within the simulated radar reflectivity and observed CAE distributions. COBRA regularly observes turbulent moisture motions at cloud edges and occasionally detects moisture convergence in the CBL. The model CBL evolutions coincide well with the diurnal variations of CAE height, thereby showing that the island presents a good case for studying CBL evolution and that COBRA is useful to find the CBL depth here. The model results show that the warmed island induces horizontal convective rolls and a convergent zone above the island. A merging of the thermals, the rolls, and the sea-breeze reinforces the upward energy transfer, which generates a cumulus street and a distinct roll cloud being supported by orographic uplift. Wind direction characterizes a moist CBL formation and the cloud initiations above Okinawa Island.

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Modified-Dewan Optical Turbulence Parameterizations

Cited by 9 publications

References 1 publication

Satellite-mediated quantum atmospheric links

Satellite-mediated quantum atmospheric links

Satellite-mediated quantum atmospheric links

Convective Boundary Layer above a Subtropical Island Observed by C-band Radar and Interpretation using a Cloud Resolving Model

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