SRL/Reference sonde P. Di Girolamo, D. Whiteman, B. Demoz, J. Wang, K. Beierle, T. Weckwerth The Reference sonde (C34) consists of a Snow White (SW) chilled-mirror.

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Presentation transcript:

SRL/Reference sonde P. Di Girolamo, D. Whiteman, B. Demoz, J. Wang, K. Beierle, T. Weckwerth The Reference sonde (C34) consists of a Snow White (SW) chilled-mirror dew point hygrometer and a carbon hygristor for humidity measurements. Accuracy: 0.25 % in terms of relative humidity measurements. The SW needs no individual calibration and can be used again without recalibration if recovered after flight.

Comparison between SRL and NCAR Reference radiosondes NCAR Reference radiosonde Nine reference radiosonde were launched in Homestead during IHOP Eight of these were launched at times when SRL was operational. Only three reference radiosondes were launched during the 11 days for which SRL data have been released (Z _162645, Z _ and Z _025610).

Comparison between SRL, reference sonde (both SW and carbon hygristor) and closest in time Vasiala RS 80. SRL data have been interpolated at sensors’ heights. Unfortunately, some data points result to be missing in the reference sonde profiles. Reference sonde Z _ no height information between 1400 and 1850 m Reference sonde Z _ Large gaps of humidity information (2-3.5 km; km) pressure information result to be missing (only the surface value results to be available). Deviations beween SRL and reference radiosonde are as large as 20 %.

Z _ side by side with y hom Z _ simultaneously with y hom Z _ simultaneously with y hom The Reference Sonde (RS) uses a hypsometer to measure pressure. This sensor is not reliable so we did not use the pressure data from the RS, but we used the pressure data from the Vaisala radiosondes, which is good.

Mixing ratio: direct measurement for the Raman lidar Relative humidity: direct measurement for the radiosonde Relative humidity water vapour mixing ratios saturation vapour pressure, which depends of pressure and temperature. Several empirical relationships, which we compared and revealed deviations between them up to 3 %. –WMO formulation –Bolton formulation (1980) –Expression derived from Smithsonian Meteorological Tables. IHOP_2002 Water Vapor Intercomparison Workshop, 2-3 October 2003, NCAR, Boulder, CO

SRL data are quite close to SW (differences <10 % up to 3.5 km a.s.l.)

SRL is moister than SW (differences ~ -20 % up to 4.8 km a.s.l.) Much better agreement above Integration time for lidar to be changed in order to meet reference sonde effective launch time, which is not 10:46 UT, but 11:40 UT Wind speed in BL > 15 m/s, so that different air masses are sounded from Lidar and sondes

SRL is drier than SW below ~ 2.3 km a.s.l., moister between 2.3 and 3 km, and drier above (differences ~ -30 to +20 %) Integration time for lidar to be changed in order to meet reference sonde effective launch time, which is not 02:56 UT, but 03:35 UT Wind speed in BL > 15 m/s