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| Titel |
Long-term calibration of ceilometer Jenoptik CHM 15k using an automatic and non-supervised Rayleight fit |
| VerfasserIn |
Lucas Alados-Arboledas, Alberto Cazorla Cabrera, Juan Antonio Bravo-Aranda, Juan Andrés Casquero Vera |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113570
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| Publikation (Nr.) |
 EGU/EGU2015-13787.pdf |
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| Zusammenfassung |
| Abstract
Active remote sensing has been consolidated as a very useful tool to study the atmosphere. Particularly, the use of lidar systems has been mainly extended for determining aerosol optical and microphysical properties, whereas ceilometers has been used mainly for detecting cloud base height due to their lower signal-to-noise ratio compared to lidar systems. However, the potential spatial distribution of ceilometers is considerably higher than lidars as well as their temporal resolution. Thus, the calibration of ceilometers for determining aerosol optical properties would help to improve the spatial and temporal resolution already reached using lidar systems. This work shows a methodology for the calibration of a ceilometer Jenoptik CHM 15k that consists on applying a Rayleigh fit in an automatic and non supervised way to 1-hour mean profiles during day- and night-time. Results show the calibration factors retrieved with a 1.5 year measurement database performed at the Granada EARLINET station (Granada, Spain). The monthly mean calibration factor is stable during the study period not showing a seasonal dependence and obtaining a mean and standard deviation for the calibration factor of 18.8±2.2 km3•sr.
Acknowledgments: EARLINET lidar measurements are supported by the 7th Framework Programme project Aerosols, Clouds, and Trace Gases Research Infrastructure Network (ACTRIS) (grant agreement no. 262254) and Spanish national project CGL_2013_45410_R). The field campaign was performed in the framework of work package 4 on aerosol-radiation-climate interactions of the coordinated program ChArMEx. |
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