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Full-Text Articles in Physics
Observation Of A Self-Limiting, Shear-Induced Turbulent Inversion Layer Above Marine Stratocumulus, J. Katzwinkel, H. Siebert, R. A. Shaw
Observation Of A Self-Limiting, Shear-Induced Turbulent Inversion Layer Above Marine Stratocumulus, J. Katzwinkel, H. Siebert, R. A. Shaw
Michigan Tech Publications
High-resolution measurements of thermodynamic, microphysical, and turbulence properties inside a turbulent inversion layer above a marine stratocumulus cloud layer are presented. The measurements are performed with the helicopter-towed measurement payload Airborne Cloud Turbulence Observation System (ACTOS), which allows for sampling with low true air speeds and steep profiles through cloud top. Vertical profiles show that the turbulent inversion layer consists of clear air above the cloud top, with nearly linear profiles of potential temperature, horizontal wind speed, absolute humidity, and concentration of interstitial aerosol. The layer is turbulent, with an energy dissipation rate nearly the same as that in the …
Formation Of Degenerate Band Gaps In Layered Systems, Anton I. Ignatov, Alexander M. Merzlikin, Miguel Levy, Alexey P. Vinogradov
Formation Of Degenerate Band Gaps In Layered Systems, Anton I. Ignatov, Alexander M. Merzlikin, Miguel Levy, Alexey P. Vinogradov
Michigan Tech Publications
In the review, peculiarities of spectra of one-dimensional photonic crystals made of anisotropic and/or magnetooptic materials are considered. The attention is focused on band gaps of a special type—the so called degenerate band gaps which are degenerate with respect to polarization. Mechanisms of formation and properties of these band gaps are analyzed. Peculiarities of spectra of photonic crystals that arise due to the linkage between band gaps are discussed. Particularly, it is shown that formation of a frozen mode is caused by linkage between Brillouin and degenerate band gaps. Also, existence of the optical Borrmann effect at the boundaries of …
Aerosols-Cloud Microphysics-Thermodynamics-Turbulence: Evaluating Supersaturation In A Marine Stratocumulus Cloud, F. Ditas, R. A. Shaw, H. Siebert, M. Simmel, B. Wehner, A. Wiedensohler
Aerosols-Cloud Microphysics-Thermodynamics-Turbulence: Evaluating Supersaturation In A Marine Stratocumulus Cloud, F. Ditas, R. A. Shaw, H. Siebert, M. Simmel, B. Wehner, A. Wiedensohler
Michigan Tech Publications
This work presents a unique combination of aerosol, cloud microphysical, thermodynamic and turbulence variables to characterize supersaturation fluctuations in a turbulent marine stratocumulus (SC) layer. The analysis is based on observations with the helicopter-borne measurement platform ACTOS and a detailed cloud microphysical parcel model following three different approaches: (1) From the comparison of aerosol number size distributions inside and below the SC layer, the number of activated particles is calculated as 435 ± 87 cm -3 and compares well with the observed median droplet number concentration of N̄ d = 464 cm -3. Furthermore, a 50% activation diameter of D …
Arbitrary Super Surface Modes Bounded By Multilayered Metametal, Ruoxi Yang, Xiaoyue Huang, Zhaolin Lu
Arbitrary Super Surface Modes Bounded By Multilayered Metametal, Ruoxi Yang, Xiaoyue Huang, Zhaolin Lu
Michigan Tech Publications
The dispersion of the fundamental super mode confined along the boundary between a multilayer metal-insulator (MMI) stack and a dielectric coating is theoretically analyzed and compared to the dispersion of surface waves on a single metal-insulator (MI) boundary. Based on the classical Kretschmann setup, the MMI system is experimentally tested as an anisotropic material to exhibit plasmonic behavior and a candidate of “metametal” to engineer the preset surface plasmon frequency of conventional metals for optical sensing applications. The conditions to obtain artificial surface plasmon frequency are thoroughly studied, and the tuning of surface plasmon frequency is verified by electromagnetic modeling …