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全国規模の長期温暖化現象と尾瀬に比較的近い観測所の観測結果を比較した．第4次尾瀬総合学術調査で重点的に調べられた湿原の洪水現象の調査結果を元に，近隣の観測所の降雨量データと比較した．湿原における河川氾濫は従来考えられていたよりも少ない降水量，すなわち日降水量が50mmを超えると発生する可能性があり，その頻度が近年増加していた．, Long-term global warming phenomena were compared between nation-wide survey and the data recorded at local meteorological offices closer to the Oze area. Based on the flooding events studied intensively during the 4th Scientific Research of the Ozegahara mire, relationships between water level changes and the precipitations observed at the nearby meteorological stations were examined. The flooding in the mire took place at precipitations lower than the reported value for causing inundation. Precipitation events more than ca. 50 mm per day have been increasing in frequency, probably causing flood in the mire.