Correction of Humidity Bias for Vaisala RS80-A Sondes during the AMMA 2006 Observing Period

Abstract : During the African Monsoon Multidisciplinary Analyses (AMMA) program, which included a special observing period that took place over West Africa in 2006, a major effort was devoted to monitor the atmosphere and its water cycle. The radiosonde network was upgraded and enhanced, and GPS receivers deployed. Among all sondes released in the atmosphere, a significant number were Vaisala RS80-A sondes, which revealed a significant dry bias relative to Vaisala RS92 (a maximum of 14% in the lower atmosphere, reaching 20% in the upper levels). This paper makes use of a simple but robust statistical approach to correct the bias. Comparisons against independent GPS data show that the bias is almost removed at night, whereas for daytime conditions, a weak dry bias (5%) still remains. The correction enhances CAPE by a factor of about 4 and, thus, becomes much more in line with expected values over the region.
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Submitted on : Thursday, February 19, 2009 - 11:22:30 AM
Last modification on : Friday, April 5, 2019 - 8:14:09 PM

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Mathieu Nuret, Jean-Philippe Lafore, Olivier Bock, FranÇoise Guichard, Anna Agusti-Panareda, et al.. Correction of Humidity Bias for Vaisala RS80-A Sondes during the AMMA 2006 Observing Period. Journal of Atmospheric and Oceanic Technology, American Meteorological Society, 2008, 25 (11), pp.PP. 2152-2158. ⟨10.1175/2008JTECHA1103.1⟩. ⟨meteo-00362749⟩

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