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  • Meteorology and Climatology  (4)
  • Electronic structure and strongly correlated systems  (2)
  • 1
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    Origin of the extremely large magnetoresistance in topological semimetal $\mathrm{PtS}{\mathrm{n}}_{4}$ (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-05-26
    Description: Author(s): X. Luo, R. C. Xiao, F. C. Chen, J. Yan, Q. L. Pei, Y. Sun, W. J. Lu, P. Tong, Z. G. Sheng, X. B. Zhu, W. H. Song, and Y. P. Sun PtS n 4 with extremely large magnetoresistance (XMR), a fascinating topological material platform, hosts a novel topological structure and Dirac node arcs, in which the Dirac nodes form closed loops in the momentum space. Here we performed the angular dependent magnetoresistivity (AMR), Hall effect, h... [Phys. Rev. B 97, 205132] Published Fri May 25, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Pressure study of nematicity and quantum criticality in Sr3Ru2O7 for an in-plane field (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-12-28
    Description: Author(s): Dan Sun, W. Wu, S. A. Grigera, R. S. Perry, A. P. Mackenzie, and S. R. Julian We study the relationship between the nematic phases of Sr3Ru2O7 and quantum criticality. At ambient pressure, one nematic phase is associated with a metamagnetic quantum critical end point (QCEP) when the applied magnetic field is near the c axis. We show, however, that this metamagnetic transition... [Phys. Rev. B 88, 235129] Published Fri Dec 27, 2013
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    CLARREO: Reference Inter-Calibration on Orbit With Reflected Solar Spectrometer (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The CLARREO approach for reference intercalibration is based on obtaining coincident highly accurate spectral reflectance and reflected radiance measurements, and establish an on-orbit reference for existing Earth viewing reflected solar radiation sensors: CERES and VIIRS on JPSS satellites, AVHRR and follow-on imagers on MetOp, and imagers on GEO platforms. The mission goal is to be able to provide CLARREO RS reference observations that are matched in space, time, and viewing angles with measurements from the aforementioned instruments, with sampling sufficient to overcome the random error sources from imperfect data matching and instrument noise. The intercalibration method is to monitor over time changes in targeted sensor response function parameters: effective offset, gain, nonlinearity, spectral degradation, and sensitivity to polarization of optics.
    Keywords: Meteorology and Climatology
    Type: NF1676L-24143 , SPIE Asia-Pacific Remote Sensing Meeting; Apr 04, 2016 - Apr 07, 2016; New Delhi; India
    Format: application/pdf
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  • 4
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    On the Retrieval of Ice Cloud Particle Shapes from POLDER Measurements (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Shapes of ice crystals can significantly affect the radiative transfer in ice clouds. The angular distribution of the polarized reflectance over ice clouds strongly depends on ice crystal shapes. Although the angular-distribution features of the total or polarized reflectance over ice clouds implies a possibility of retrieving ice cloud particle shapes by use of remote sensing data, the accuracy of the retrieval must be evaluated. In this study, a technique, which applies single ice crystal habit and multidirectional polarized radiance to retrieve ice cloud particle shapes, is assessed. Our sensitivity studies show that the retrieved particle shapes &om this algorithm can be considered good approximations to those in actual clouds in calculation of the phase matrix elements. Although a fractal poly-crystal shape or an inhomogeneous hexagonal column may also produce this type of phase functions, more representative single-scattering properties from combinations of natural particle shapes and size distributions may still be necessary in accurate retrieval of other cloud properties such as optical thickness and particle size.
    Keywords: Meteorology and Climatology
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  • 5
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    Examination of Surface Roughness on Light Scattering by Long Ice Columns by Use of a Two-Dimensional Finite-Difference Time-Domain Algorithm (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Natural particles such as ice crystals in cirrus clouds generally are not pristine but have additional micro-roughness on their surfaces. A two-dimensional finite-difference time-domain (FDTD) program with a perfectly matched layer absorbing boundary condition is developed to calculate the effect of surface roughness on light scattering by long ice columns. When we use a spatial cell size of 1/120 incident wavelength for ice circular cylinders with size parameters of 6 and 24 at wavelengths of 0.55 and 10.8 mum, respectively, the errors in the FDTD results in the extinction, scattering, and absorption efficiencies are smaller than similar to 0.5%. The errors in the FDTD results in the asymmetry factor are smaller than similar to 0.05%. The errors in the FDTD results in the phase-matrix elements are smaller than similar to 5%. By adding a pseudorandom change as great as 10% of the radius of a cylinder, we calculate the scattering properties of randomly oriented rough-surfaced ice columns. We conclude that, although the effect of small surface roughness on light scattering is negligible, the scattering phase-matrix elements change significantly for particles with large surface roughness. The roughness on the particle surface can make the conventional phase function smooth. The most significant effect of the surface roughness is the decay of polarization of the scattered light.
    Keywords: Meteorology and Climatology
    Type: Applied Optics; 43; 1957-1964
    Format: text
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  • 6
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    Estimation of Instantaneous TOA Albedo at 670 nm over Ice Clouds from POLDER Multidirectional Measurements (2003)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: An algorithm that determines the 670-nm top-of-atmosphere (TOA) albedo of ice clouds over ocean using Polarization and Directionality of the Earth's Reflectance ( POLDER) multidirectional measurements is developed. A plane-parallel layer of ice cloud with various optical thicknesses and light scattering phase functions is assumed. For simplicity, we use a double Henyey-Greenstein phase function to approximate the volume-averaged phase function of the ice clouds. A multidirectional reflectance best-fit match between theoretical and POLDER reflectances is used to infer effective cloud optical thickness, phase function and TOA albedo. Sensitivity tests show that while the method does not provide accurate independent retrievals of effective cloud optical depth and phase function, TOA albedo retrievals are accurate to within similar to 3% for both a single layer of ice clouds or a multilayer system of ice clouds and water clouds. When the method is applied to POLDER measurements and retrieved albedos are compared with albedos based on empirical angular distribution models (ADMs), zonal albedo differences are generally smaller than similar to 3%. When albedos are compared with those on the POLDER-I ERB and Cloud product, the differences can reach similar to 15% at small solar zenith angles.
    Keywords: Meteorology and Climatology
    Type: Geophysical Research; 109
    Format: text
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