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Proceedings Paper

Validation of COSMIC water vapor profiles using Raman lidar measurements performed at CIAO
Author(s): F. Madonna; P. Burlizzi; A. Giunta; I. Binietoglou; M. R. Perrone; G. Pappalardo
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Paper Abstract

The development of the Global Position System (GPS) satellite network provides new opportunities to characterize atmospheric parameters using innovative techniques. The GPS Radio Occultation Technique (GPS RO) is one of the most recent and promising atmospheric remote sensing technique applied to GPS measurements. The GPS RO technique allows obtaining profiles of refractivity, temperature, pressure and water vapor in the neutral atmosphere and electron density in the ionosphere. In the last years, other missions confirmed the RO efficiency, like GPS/MET, COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate), Formosa Satellite Mission 3 and the last Radio Occultation Sounder Antenna for the Atmosphere. In this work, water vapor mixing ratio profiles retrieved from COSMIC observations are presented and validated using ground based water vapor Raman lidar profiles. As far as we know, this is the first time water vapor mixing ratio profiles provided by COSMIC are compared with a ground based Raman lidar. COSMIC profiles used in this study are retrieved applying a one-dimensional variational method that make use of ECMWF low resolution analysis data as a guess of atmospheric water vapor. Raman lidar measurements of the water vapor mixing ratio profiles are provided by PEARL (Potenza EArlinet Raman Lidar) system running at CIAO, located in Potenza, South Italy. Performance of COSMIC retrieval are studied over a period of one year (2008) of systematic water vapor Raman lidar measurements. A possible strategy for reducing the impact of the co-location mismatch between satellite footprint and the lidar station is presented and the problem of the vertical resolution of COSMIC profiles respect to the Raman lidar is also discussed. The statistical analysis for the selected cases shows good performance of COSMIC in the identification of the vertical gradients of the water vapor field, even though the average difference between the Raman lidar and the COSMIC profiles suggests that caution should be taken in using COSMIC data as an absolute or reference measurement of water vapor, in particular in the low and middle troposphere.

Paper Details

Date Published: 30 September 2011
PDF: 11 pages
Proc. SPIE 8182, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing VII, 81820B (30 September 2011); doi: 10.1117/12.898117
Show Author Affiliations
F. Madonna, CNR, Instituto di Metodologie per l'Analisi Ambientale (Italy)
P. Burlizzi, Univ. of Salento (Italy)
A. Giunta, CNR, Instituto di Metodologie per l'Analisi Ambientale (Italy)
I. Binietoglou, CNR, Instituto di Metodologie per l'Analisi Ambientale (Italy)
M. R. Perrone, Univ. of Salento (Italy)
G. Pappalardo, CNR, Instituto di Metodologie per l'Analisi Ambientale (Italy)

Published in SPIE Proceedings Vol. 8182:
Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing VII
Upendra N. Singh; Gelsomina Pappalardo, Editor(s)

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