Zusammenfassung
Es werden Spektren der Himmelsstrahlung im Wellenlängenbereich zwischen 3.1 und 4.2 μm mitgeteilt, die mit einem Gitterspektrograph zur Tages- und zur Nachtzeit in der Nähe von München aufgenommen worden sind. Die spektrale Spaltbreite betrug bis zu 0.005 μm. Berechnungen der nächtlichen Wärmestrahlung von Wasserdampf und CO2 bei 3.8 μm ergeben zu kleine Strahldichten. Die Diskrepanz zu den Meßergebnissen wird durch thermische Emission der Aerolteilchen erklärt und führt zu einem Aerosol-Absorptionskoeffizient von 3 bis 10% der Aerosol-Extinktion. Eine Berechnung der N2O-Bande bei 3.9 μm zeigt eine Diskrepanz zu den Meßergebnissen, deren Erklärung offen bleibt.
Summary
The spectral interval between 3.1 and 4.2 microns of the sky radiation has been measured with a grating spectrometer during night- and daytime from a ground station near Munich. The minimum spectral slitwidths used were .005 microns. Calculated nighttime thermal emission of water vapor and carbon dioxide near 3.8 microns gives too small radiances. The discrepancy with regard to the results of the measurements is explained by thermal emission of the aerosol particles. An aerosol absorption coefficient of 3 to 10% of the total extinction by the aerosol has been deduced. Calculation of the nitrous oxide band emission near 3.9 microns leads to a discrepancy with regard to measurements, which can not yet be explained.
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Bertram, FW. Die thermische Emission der Atmosphäre im Spektralbereich zwischen 3.1 und 4.2 μm. PAGEOPH 68, 196–213 (1967). https://doi.org/10.1007/BF00874895
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DOI: https://doi.org/10.1007/BF00874895