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| Titel |
Analysis of the application of the optical method to the measurements of the water vapor content in the atmosphere – Part 1: Basic concepts of the measurement technique |
| VerfasserIn |
V. D. Galkin, F. Immler, G. A. Alekseeva, F.-H. Berger, U. Leiterer, T. Naebert, I. N. Nikanorova, V. V. Novikov, V. P. Pakhomov, I. B. Sal'nikov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 5 ; Nr. 4, no. 5 (2011-05-10), S.843-856 |
| Datensatznummer |
250001978
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| Publikation (Nr.) |
 copernicus.org/amt-4-843-2011.pdf |
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| Zusammenfassung |
| We retrieved the total content of the atmospheric water vapor (or Integrated
Water Vapor, IWV) from extensive sets of photometric data obtained since
1995 at Lindenberg Meteorological Observatory with star and sun photometers.
Different methods of determination of the empirical parameters that are
necessary for the retrieval are discussed. The instruments were
independently calibrated using laboratory measurements made at Pulkovo
Observatory with the VKM-100 multi-pass vacuum cell. The empirical
parameters were also calculated by the simulation of the atmospheric
absorption by water vapor, using the MODRAN-4 program package for different
model atmospheres. The results are compared to those presented in the
literature, obtained with different instruments and methods of the
retrieval. The reliability of the empirical parameters, used for the power
approximation that links the water vapor content with the observed
absorption, is analyzed. Currently, the total (from measurements,
calibration, and calculations) errors yield the standard uncertainty of
about 10 % in the total column water vapor. We discuss the possibilities
for improving the accuracy of calibration to ~1 % as indispensable
condition in order to make it possible to use data obtained by optical
photometry as an independent reference for other methods (GPS,
MW-radiometers, lidar, etc). |
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