Correction of Humidity Bias for Vaisala RS80-A Sondes during the AMMA 2006 Observing Period
Correction of Humidity Bias for Vaisala RS80-A Sondes during the AMMA 2006 Observing Period
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AMMA 2006 观测期间维萨拉 RS80-A 探测器的湿度偏差校正
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Ngamini
中科院分区：
文献类型：
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作者：
M. Nuret;J. Lafore;F. Guichard;J. Redelsperger;O. Bock;A. Agustí;J. Ngamini
摘要 非洲季风多学科分析 (AMMA) 计划（其中包括 2006 年在西非进行的特殊观测期）期间，主要致力于监测大气及其水循环。无线电探空仪网络得到升级和增强，并部署了 GPS 接收器。在释放到大气中的所有探空仪中，维萨拉 RS80-A 探空仪占很大一部分，它显示出相对于维萨拉 RS92 的显着干偏差（在低层大气中最大为 14%，在高层大气中达到 20%）。本文利用一种简单但稳健的统计方法来纠正偏差。与独立 GPS 数据的比较表明，夜间偏差几乎被消除，而在白天条件下，仍然存在微弱的干燥偏差 (5%)。该修正将 CAPE 提高了约 4 倍，因此更加符合该地区的预期值。
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.