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| Titel |
Calibration and validation of water vapour lidar measurements from Eureka, Nunavut, using radiosondes and the Atmospheric Chemistry Experiment Fourier Transform Spectrometer |
| VerfasserIn |
A. Moss, R. J. Sica, E. McCullough, K. Strawbridge, K. Walker, J. Drummond |
| 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 ; 6, no. 3 ; Nr. 6, no. 3 (2013-03-15), S.741-749 |
| Datensatznummer |
250017844
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| Publikation (Nr.) |
 copernicus.org/amt-6-741-2013.pdf |
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| Zusammenfassung |
| The Canadian Network for the Detection of Atmospheric Change and Environment
Canada DIAL lidar located at the Polar Environment Atmospheric Research
Laboratory (PEARL) in Eureka, Nunavut, has been upgraded to measure water
vapour mixing ratio profiles. The lidar is capable of measuring water vapour
in the dry Arctic atmosphere up to the tropopause region. Measurements were
obtained in the February to March polar sunrise during 2007, 2008 and 2009 as
part of the Canadian Arctic ACE (Atmospheric Chemistry Experiment) Validation Campaign. Before such measurements
can be used to address important questions in understanding dynamics and
chemistry, the lidar measurements must be calibrated against an independent
determination of water vapour. Here, radiosonde measurements of relative
humidity have been used to empirically calibrate the lidar measurements. It
was found that the calibration varied significantly between each year's
campaign. However, the calibration of the lidar during an individual polar
sunrise campaign agrees on average with the local radiosonde measurements to
better than 12%. To independently validate the calibration of the lidar
derived from the radiosondes, comparisons are made between the calibrated
lidar measurements and water vapour measurements from the ACE
satellite-borne Fourier Transform Spectrometer (ACE-FTS). The
comparisons between the lidar and satellite-borne spectrometer for both a
campaign average and single overpasses show favourable agreement between the
two instruments and help validate the lidar's calibration. The 39 nights of
high-Arctic water vapour measurements obtained offer the most detailed high
spatial-temporal resolution measurement set available for understanding this
time of transition from the long polar night to polar day. |
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