Surface meteorological observations have been made continuously since January 1987 at Asuka Station. The station was established as the third Japanese Antarctic station in December 1984 at 71 °32'S and 24 °08' E at an elevation of 965 m a.s.l. The automatic meteorological observation system was installed at the station at the beginning of January 1987. The international index number(WMO) 89524 was given. The present report contains the surface synoptic data taken by the 31th Japanese Antarctic

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... esearch Expedition (JARE-31) in 1990. Observer was Akira Iwasaki from Japan Meteorological Agency. Surface synoptic reports (FM12-Vlll-EXT.-SYNOP) at 00, 03, 06, 09, 12, 15, 18 and 21 UTC and monthly summaries (FM71-VI-CLIMAT) were sent to Darmstadt, F. R. G. through Geostationary Satellite (METOSAT). Data of the present report had also been published in the Data Report by Japan Meteorological Agency (1992). Instrumentation The automatic meteorological observation system (Nakaasa Inst. Co.) is composed of sensors and data recording unit as shown in Fig. 1. Atmospheric * --+ Mean 872