Analysis of the spatial-temporal stability of the estimates of surface emissivity and atmospheric moisture profiles in meteorological processing of infrared spectral measurements from the GOES-8 sounder

2003 ◽  
Author(s):  
Paul Menzel ◽  
Youri Plokhenko
Keyword(s):  
Temporal Stability ◽  
Atmospheric Moisture ◽  
Surface Emissivity ◽  
Spectral Measurements ◽  
Infrared Spectral ◽  
Moisture Profiles

scholarly journals Near-infrared spectral measurements and multivariate analysis for predicting glass contamination of refuse-derived fuel

2017 ◽  
Vol 142 ◽  
pp. 943-949 ◽  
Author(s):  
Olivia Winn ◽  
Kiran Thekkemadathil Sivaram ◽  
Ioanna Aslanidou ◽  
Jan Skvaril ◽  
Konstantinos Kyprianidis
Keyword(s):  
Multivariate Analysis ◽  
Near Infrared ◽  
Spectral Measurements ◽  
Refuse Derived Fuel ◽  
Infrared Spectral

Monothiocarbamate complexes of divalent nickel, palladium, and platinum

1973 ◽  
Vol 26 (8) ◽  
pp. 1645 ◽  
Author(s):  
EM Krankovits ◽  
RJ Magee ◽  
MJ O'Conner
Keyword(s):  
Proton Magnetic Resonance ◽  
Resonance Spectrum ◽  
Proton Magnetic Resonance Spectrum ◽  
Spectral Measurements ◽  
Infrared Measurements ◽  
Divalent Nickel ◽  
Infrared Spectral ◽  
Definite Structure ◽  
First Time

The preparation of a number of polymeric, octahedral bis(N- alkylmonothiocarbamato)nickel(II) complexes and some of their base adducts is described. ��� The preparation and characterization of some bis(phosphine)bis(N- alkylmono-thiocarbamato)palladium(II) compounds are also described for the first time. The butyl compound is monomeric in chloroform and infrared spectral measurements of all compounds indicate that the monothiocarbamate ligands are bonded to palladium through the sulphur atoms only. The proton magnetic resonance spectrum of the dimethylphenylphosphine complex shows clearly that the phosphine groups are trans in the complexes. ��� Simple bis(monothiocarbamato)-palladium(II) or -platinum(II) have not been isolated but pyrrolidinium tetra(N- pyrrolidylmonothiocarbamato)-palladium(II) or -platinum(II) compounds are formed. Infrared measurements indicate that the mono-thiocarbamate ligands are bonded to the metal through both oxygen and sulphur atoms but no definite structure can be proposed for these compounds at present.

scholarly journals Comparison of the Infrared Surface Emissivity Model (ISEM) with a Physical Emissivity Model

2010 ◽  
Vol 27 (2) ◽  
pp. 345-352 ◽  
Author(s):  
Sungwook Hong ◽  
Inchul Shin ◽  
Mi-Lim Ou
Keyword(s):  
Refractive Index ◽  
Roughness Parameter ◽  
Satellite Observation ◽  
Sea Surface ◽  
Northwestern Pacific ◽  
Surface Emissivity ◽  
Infrared Wavelength ◽  
Clear Sky ◽  
Infrared Spectral ◽  
Emissivity Model

Abstract Accurate models of surface emissivity are important for interpreting satellite radiance observations. Surface emissivity depends on the satellite zenith angle, roughness, polarization, and refractive index of the surface. The effects of the roughness parameter on emissivity have not been studied thoroughly. By using an infrared geostationary satellite observation and a physical model based on the radiative transfer equation, the forward emissivity model and physical emissivity model are validated in the northwestern Pacific Ocean. First, the unpolarized emissivity at a given view angle and a wavelength of 10.8 μm in the thermal infrared spectral region is decomposed for the clear sky. The refractive index of the sea surface is quantitatively retrieved using the inversion of Fresnel equations. The refractive index of the sea surface derived from the physical emissivity exhibits a reasonable range within the infrared wavelength. The result of this investigation can be applied to the land emissivity model, which has not been studied thoroughly.

Development of a Global Infrared Land Surface Emissivity Database for Application to Clear Sky Sounding Retrievals from Multispectral Satellite Radiance Measurements

2008 ◽  
Vol 47 (1) ◽  
pp. 108-123 ◽  
Author(s):  
Suzanne W. Seemann ◽  
Eva E. Borbas ◽  
Robert O. Knuteson ◽  
Gordon R. Stephenson ◽  
Hung-Lung Huang
Keyword(s):  
Land Surface ◽  
Atmospheric Temperature ◽  
Surface Emissivity ◽  
Spectral Gaps ◽  
Global Database ◽  
Land Surface Emissivity ◽  
Moderate Resolution ◽  
Moderate Resolution Imaging Spectroradiometer ◽  
Hinge Points ◽  
Moisture Profiles

Abstract A global database of infrared (IR) land surface emissivity is introduced to support more accurate retrievals of atmospheric properties such as temperature and moisture profiles from multispectral satellite radiance measurements. Emissivity is derived using input from the Moderate Resolution Imaging Spectroradiometer (MODIS) operational land surface emissivity product (MOD11). The baseline fit method, based on a conceptual model developed from laboratory measurements of surface emissivity, is applied to fill in the spectral gaps between the six emissivity wavelengths available in MOD11. The six available MOD11 wavelengths span only three spectral regions (3.8–4, 8.6, and 11–12 μm), while the retrievals of atmospheric temperature and moisture from satellite IR sounder radiances require surface emissivity at higher spectral resolution. Emissivity in the database presented here is available globally at 10 wavelengths (3.6, 4.3, 5.0, 5.8, 7.6, 8.3, 9.3, 10.8, 12.1, and 14.3 μm) with 0.05° spatial resolution. The wavelengths in the database were chosen as hinge points to capture as much of the shape of the higher-resolution emissivity spectra as possible between 3.6 and 14.3 μm. The surface emissivity from this database is applied to the IR regression retrieval of atmospheric moisture profiles using radiances from MODIS, and improvement is shown over retrievals made with the typical assumption of constant emissivity.

Fourier Transform Reflectance Spectrometry between 8000 cm−1 (1.25 μm) and 800 cm−1 (12.5 μm) Using an Integrating Sphere

1983 ◽  
Vol 37 (1) ◽  
pp. 32-38 ◽  
Author(s):  
W. Richter
Keyword(s):  
Fourier Transform ◽  
Integrating Sphere ◽  
Angle Of Incidence ◽  
Spectral Measurements ◽  
Hemispherical Reflectance ◽  
Infrared Spectral ◽  
High Purity Silicon ◽  
Silicon And Germanium ◽  
Main Components ◽  
Absolute Reflectance

Spectral measurements of the directional hemispherical reflectance of samples exhibiting variant reflection behavior were performed in the near and mid infrared spectral region using the integrating sphere method. The main components of the experimental setup were a sphere with a diffuse gold coating and a commercial Fourier transform spectrometer for the spectral analysis of the radiation incident on and reflected by the sample which is located in the center of the sphere. The capability of the device to measure absolute reflectances was tested with polished slices of high purity silicon and germanium, the reflectances of which can be calculated from the refractive indices. Agreement between the measured and calculated values was found to be within 0.01. Diffuse reflectance standards are not yet available in the infrared. The uncertainty of absolute reflectance measurements is estimated to be ±0.02. Several examples of chemical and technical applications are presented. A relatively low spectral resolution, 16 cm−1, was used to keep the measurement times short, within the range of a few minutes, thereby minimizing signal drifts. Higher resolution, sometimes necessary for special purposes in chemical analysis, can be attained by longer measurement times. No extensive sample preparation and adjustment is necessary besides the choice of the desired angle of incidence.

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