Report on the ACR observation by the 28th Japanese Antarctic Research Expedition

The Japanese Antarctic Research Expedition (JARE) has started the 5-year project of "Antarctic Climate Research (ACR)" from JARE-28 in 1987. This project covers the field of Antarctica among the "World Climate Research Program (WCRP)", and aims at knowing the climate change in the Antarctic and clarifying the role of Antarctica in the global climate. Interannual variation of Antarctic atmosphere and air-sea ice interaction are set as the main subjects. In JARE-28,3 major items of observation were carried out under the subject of interannual variation of Antarctic atmosphere. 1) Cloud-radiation climatology: Cloud and sea ice distributions were observed by the NOAA satellite. Radiation measurements were made at the surface to obtain cloud information and to know the effect of clouds on the surface radiation budget. The surface radiation measurements are compared with satellite data to interpret the meanings of the satellite data. 2) Extention of meteorological observing area: The surface synoptic observation was started the newly established Asuka Camp and automatic weather stations were tested at Mizuho Station. 3) Monitoring of minor constituents: Continuous measurements of atmospheric CO_2 content and ozone observations were made.

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