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Previous research has found that conventional radiosondes equipped with atraditional pressure sensor can be subject to a pressure bias, particularlyin the stratosphere. This study examines this pressure bias and the resultingaltitude misestimation, and its impact on temperature, ozone, and water vaporprofiles is considered using data obtained between December 2003 and January 2010during the Soundings of Ozone and Water in the Equatorial Region (SOWER)campaigns. The payload consisted of a radiosonde (Vaisala RS80), ozone andwater vapor sondes, and a global positioning system (GPS) sensor. More than30 soundings are used in this study. As GPS height data are thought to behighly accurate, they can be used to calculate pressure. The RS80 pressurebias in the tropical stratosphere is estimated to be −0.4 ± 0.2 hPa(1σ) between 20 and 30 km. As this pressure bias is negativethroughout the stratosphere, it leads to systematic overestimation ofgeopotential height by 43 ± 23, 110 ± 40, and 240 ± 92 m(1σ) at 20, 25, and 30 km, respectively when it is calculated by usingthe hypsometric equation. Because of the altitude overestimation, we see someoffsets in observation parameters having a vertical gradient such astemperature, ozone, and water vapor. Those offsets in the meteorologicalsoundings obtained using the RS80 may have generated an artificial trend inthe meteorological records when radiosondes were changed from the RS80, whichhad no GPS unit, to the new ones with a GPS unit. Therefore, it is importantto take those offsets into account in climate change studies

Altitude misestimation caused by the Vaisala RS80 pressure bias and its impact on meteorological profiles