For reconstructing past climate, an empirical linear relationship between air temperature and isotopic compositions of ice core has been used as a paleothermometer. However, the relationship between air temperature and stable isotope data is affected by the several factors other than temperature. Based on the result of Ichiyanagi et al. (2002), we examine the interannual variation of stable isotopes in precipitation at Argentine Island, Antarctica. The causes for the interannual variation of stable isotopes in Antarctic precipitation are discussed in the relation with El Niño/Southern Oscillation (ENSO) using large-scale atmospheric data. Anomalies of surface air temperature and δ¹⁸O of precipitation in the Antarctic Peninsula are negatively correlated with ENSO. The low (high) anomaly of δ¹⁸O is associated with southerly (northerly) and cold (warm) anomalies, which is considered to appear as a response to the ENSO teleconnection. Results of the water budget analysis considering the origin of water vapor, relative contribution and remaining ratio of moisture flux are very important for determining the observed δ¹⁸O in precipitation.

2000年6月に始まった三宅島2000年噴火活動に関連し，三宅島の大路池および1つの井戸において湖水および地下水の連続観測を開始した。短期的な大路池の水収支を推定するため，降雨に対する水位のレスポンスの解析を行った。2001年1月から2002年2月までの大路池における水位変化から，25個の降雨イベントを選び出した。地下水流入および表面流入量と地下水流出の差の時間変動には，顕著な変化は見られなかった。