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Newspaper/Magazine Article: BibTeX citation key:  Nuret2008a
Nuret, M., Lafore, J.-P., Bock, O., Guichard, F., Agusti-Panareda, A., Ngamini, J.-B. & Redelsperger, J.-L. Correction of humidity bias for Vaisala RS80-A sondes during AMMA 2006 Observing Period. In: Aladin Newsletter, 2008, 2152–2158.
Added by: Devic 2008-08-20 11:26:54    Last Edited by: Fanny Lefebvre 2010-12-22 12:53:13
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Categories: Environment and Climate Monitoring, Water cycle
Keywords: LOP - EOP, SOP
Creators: Agusti-Panareda, Bock, Guichard, Lafore, Ngamini, Nuret, Redelsperger
Collection: Aladin Newsletter

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Abstract
During the African Monsoon Multidisciplinary Analyses (AMMA) program whose Special Observing Period took place over West Africa in 2006, a major effort has been devoted to monitor the atmosphere and its water cycle. The radiosounding network has been upgraded and enhanced, and GPS receivers deployed. Among all sondes released in the atmosphere, a significant part was 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 four, it thus becomes much more in line with expected values over the region.
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Last Edited by: Fanny Lefebvre