Accuracy of Water Vapor Observations from in-situ and Remote Sensing Techniques: First Results from the DEMEVAP 2011 Campaign
Résumé
The accuracy of water vapour observations from four different operational radiosonde types (Vaisala RS92, MODEM M2K2-DC and M10, and Meteolabor Snow- White) flows simultaneously on the same ballon are intercompared and compared to GPS and Raman lidar measurements during the DEMEVAP 2011 experiment. The RS92 and Snow-White sondes show a slight moist bias at night-time compared to GPS, while the MODEM sondes show a dry bias. The IGNLATMOS Raman lidar water vapour measurements are well consistent with RS92. Raman lidar calibration factors determined from RS92 and capacitive humidity sensors achieve stabilities of 2% and 3-5% respectively. They detect a change in the lidar calibration during the experiment which is not explained yet.
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