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Reanalysis of Radiosonde Data from the 1996 and 1997 Water Vapor Intensive Observation Periods: Application of the Vaisala RS-80H Contamination Correction Algorithm to Dual-Sonde Soundings

Since 1994, comparisons between radiosondes used by the Atmospheric Radiation Measurement (ARM) Program and other instruments deployed at the Southern Great Plains Cloud and Radiation Testbed (SGP CART) have suggested that significant batch-to-batch variations exist in the accuracy of radiosonde relative humidity measurements (Lesht 1995; Lesht and Liljegren 1996). This variation was statistically confirmed (Lesht 1997, 1998) by experiments conducted during the 1996 Water Vapor Intensive Observation Period (WVIOP). The discovery by ARM of a manufacturing calibration error that occurred in November 1994 pointed to the calibration process as the source of the variation. Subsequent investigation by the manufacturer (Vaisala), however, indicates that the problem is rather a result of contamination of the humidity sensor during storage. This possibility was originally discounted because Vaisala has long done storage drift tests as part of their normal quality control process; the problem was that these tests were conducted with sensor packages only, rather than with completely assembled radiosondes that seem to be the source of the contamination. The manufacturer has developed a preliminary and proprietary algorithm that can be used to estimate corrected values of relative humidity as a function of the radiosonde ‘age’ (the time between calibration and use).