Comparison of Meisei RS2-91 Rawinsondes and Vaisala RS92-SGP Radiosondes at Tateno for the Data Continuity for Climatic Data Analysis
Eriko KOBAYASHI, Yoshiyuki NOTO, Sadanori WAKINO, Hiroyuki YOSHII, Tomoya OHYOSHI, Shinya SAITO and Yusuke BABA
by Journal of the Meteorological Society of Japan. Ser. II (JMSJ) at 2012-08-29
Observation instruments are commonly upgraded because of technological advances and the convenience of the observation agency. However, great care is necessary when changing instruments to ensure data continuity for climatic data analysis. The Tateno upper-air observation station of the Japan Meteorological Agency replaced the Meisei RS2-91 type rawinsondes with Vaisala RS92-SGP type GPSsondes in December 2009. We carried out a total of 115 simultaneous dual launches for four seasons to investigate any differences in performance. The simultaneous sensor comparison results showed that Vaisala RS92-SGP temperature was 0.1-0.4K higher than Meisei RS2-91 temperature above the 100 hPa layer in night time observations; and that Meisei RS2-91 temperature was ∼0.1K higher above the 30 hPa layer in day time observations. Vaisala RS92-SGP relative humidity was ∼5% lower, particularly under humid conditions and in autumn. Vaisala RS92-SGP pressure was ∼0.5 hPa higher in the stratosphere. We also made pressure-level comparisons for temperature and relative humidity. Furthermore, comparison results are shown for precipitable water vapor measurements taken with a collocated GPS receiver for a sensitivity analysis on the number of dual soundings and for a reanalysis of upper-air temperature trends for 1956-2010, taking the three instrumental change events into consideration.
Kobayashi, E., Y. Noto, S. Wakino, H. Yoshii, T. Ohyoshi, S. Saito, and Y. Baba, 2012: Comparison of Meisei RS2-91 rawinsondes and Vaisala RS92-SGP radiosondes at Tateno for the data continuity for climatic data analysis. J. Meteor. Soc. Japan, 90, 923-945, doi: 10.2151/jmsj.2012-605