GPS water vapor project associated to the ESCOMPTE programme: description and first results of the field experiment

Bock, Olivier; Doerflinger, E.; Masson, Frédéric; Walpersdorf, Andréa; Van-Baelen, J.; Tarniewicz, J.; Troller, M.; Somieski, A.; Geiger, Alain; Bürki, Beat

doi:10.1016/j.pce.2004.01.014

Cited by 19 publications

(18 citation statements)

References 35 publications

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“…ZTD is thus mapped into IWV, using simply surface pressure and temperature and empirical formulae (Davis et al, 1985;Bevis et al, 1992;Emardson and Derks, 1999). The accuracy in GPS IWV has been assessed by a number of authors, using intercomparisons with radiosondes, microwave radiometers, sun photometers, lidars and Very Long Baseline Interferometry (Foelsche and Kirchengast, 2001;Niell et al, 2001;Bock et al, 2004). The agreement between these techniques is about 1-2 kg m −2 .…”

Section: B Gps Water Vapor Retrievalmentioning

confidence: 99%

Diurnal Cycle of Water Vapor as Documented by a Dense GPS Network in a Coastal Area during ESCOMPTE IOP2

Bastin

Champollion

Bock

et al. 2007

Journal of Applied Meteorology and Climatology

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Section: B Gps Water Vapor Retrievalmentioning

confidence: 99%

Diurnal Cycle of Water Vapor as Documented by a Dense GPS Network in a Coastal Area during ESCOMPTE IOP2

Bastin

Champollion

Bock

et al. 2007

Journal of Applied Meteorology and Climatology

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“…ZWD is, thus, converted into IWV (Integrated Water Vapor), using simply surface temperature and empirical formulas (Bevis et al, 1992;Emardson and Derks, 1999). The accuracy in GPS, IWV has been assessed by a number of authors, using intercomparisons with radiosondes, microwave radiometers, sun photometers, lidars, and very long interferometry baseline (Foelsche and Kirchengast, 2001;Niell et al, 2001;Bock et al, 2004). The agreement between these techniques is about 1-2 kg m −2 for typical values of IWV between 5 and 30 kg m −2 .…”

Section: Radiosonde Sensors and Gps Receiversmentioning

confidence: 99%

Water vapor observations up to the lower stratosphere through the Raman lidar during the Maïdo Lidar Calibration Campaign

et al. 2015

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Abstract.A new lidar system devoted to tropospheric and lower stratospheric water vapor measurements has been installed at the Maïdo altitude station facility of Réunion island, in the southern subtropics.To evaluate the performances and the capabilities of the new system with a particular focus on UTLS (Upper Troposphere Lower Stratosphere) measurements, the Maïdo Lidar Calibration Campaign (MALICCA) was performed in April 2013.Varying the characteristics of the transmitter and the receiver components, different system configuration scenarios were tested and possible parasite signals (fluorescent contamination, rejection) were investigated. A hybrid calibration methodology has been set up and validated to insure optimal lidar calibration stability with time. In particular, the receiver transmittance is monitored through the calibration lamp method that, at the moment, can detect transmittance variations greater than 10-15 %. Calibration coefficients are then calculated through the hourly values of IWV (Integrated Water Vapor) provided by the co-located GPS. The comparison between the constants derived by GPS and Vaisala RS92 radiosondes launched at Maïdo during MALICCA, points out an acceptable agreement in terms of accuracy of the mean calibration value (with a difference of approximately 2-3 %), but a significant difference in terms of variability (14 % vs. 7-9 %, for GPS and RS92 calibration procedures, respectively).We obtained a relatively good agreement between the lidar measurements and 15 co-located and simultaneous RS92 radiosondes. A relative difference below 10 % is measured in the low and middle troposphere (2-10 km). The upper troposphere (up to 15 km) is characterized by a larger spread (approximately 20 %), because of the increasing distance between the two sensors.To measure water vapor in the UTLS region, nighttime and monthly water vapor profiles are presented and compared. The good agreement between the lidar monthly profile and the mean WVMR profile measured by satellite MLS (Microwave Limb Sounder) has been used as a quality control procedure of the lidar product, attesting the absence of significant wet biases and validating the calibration procedure.Due to its performance and location, the MAIDO H 2 O lidar will become a reference instrument in the southern subtropics, insuring the long-term survey of the vertical distribution of water vapor. Furthermore, this system allows the investigation of several scientific themes, such as stratospheretroposphere exchange, tropospheric dynamics in the subtropics, and links between cirrus clouds and water vapor.

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“…First, the high acquisition frequency will provide the opportunity to document the temporal variability of water vapor above the Maïdo observatory with a very high resolution. Secondly, the accuracy in GPS integrated water vapor (IWV) has been assessed by many authors, using intercomparisons with radiosondes, microwave radiometers, sun photometers, lidars, and very long baseline interferometry (Foelsche and Kirchengast, 2001;Niell et al, 2001;Bock et al, 2004). The agreement between these techniques is about 1-2 kg m −2 and leads to make the GPS as a reference for total columns.…”

Section: Passive Remote Sensing Measurementsmentioning

confidence: 99%

Maïdo observatory: a new high-altitude station facility at Reunion Island (21° S, 55° E) for long-term atmospheric remote sensing and in situ measurements

et al. 2013

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GPS water vapor project associated to the ESCOMPTE programme: description and first results of the field experiment

Cited by 19 publications

References 35 publications

Diurnal Cycle of Water Vapor as Documented by a Dense GPS Network in a Coastal Area during ESCOMPTE IOP2

Diurnal Cycle of Water Vapor as Documented by a Dense GPS Network in a Coastal Area during ESCOMPTE IOP2

Water vapor observations up to the lower stratosphere through the Raman lidar during the Maïdo Lidar Calibration Campaign

Maïdo observatory: a new high-altitude station facility at Reunion Island (21° S, 55° E) for long-term atmospheric remote sensing and in situ measurements

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