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Chugugi and Wootaeck rainfall data of Gyeonggi Province from 1830 to 1893 were restored from the 『Gaksadeungnok』 that is the government records between the central government and the local during the Joseon Dynasty. The restored data periods were 27, 10, 9 and 14 years for Kwangju, Suwon, Ganghwa and Gaeseong, and the total number of restored data was 655 for the Chugugi and 427 for the Wootaek, respectively. The variation pattern of monthly rainfall by Chugugi was investigated and it showed that the monthly rainfall more than 300 mm was recorded 25 times with 18 times in July, 5 times in August and 3 times in June. The cases of more than 500 mm were also recorded 8 times with the maximum 787 mm at the Kwangju in July 1862, showing the similar pattern to Seoul. The monthly mean rainfall for the Gyeonggi Province were 259 mm in July, 204 mm in August and 121 mm in June, which were about one third of that of Seoul. The correlation analysis between the Chugugi and Wootaek data was carried out to derive the quantitative values of Wootaek observations. It revealed that 1 ‘Ri’ of Wootaek observation was equal to approximately 1 ‘Chon (Chugugi unit)’ or 20 mm, while 1 ‘Seo’ was very variable between 2 and 6 ‘Boon (Chugugi unit)’ with the median value approximately 3 ‘Boon’ or 6 mm. Recalculated Wootaek data showed that the monthly rainfall in July, August, and June were 289 mm, 154 mm, and 124 mm, respectively. Through this study, some features of the rainfall variation pattern during 1830~1893 were figured out, and quantitative interpretation of Wootaek data became possible based on the restored rainfall data from the 『Gaksadeungnok』. Though many pages of the book have been lost during the last hundreds years, 『Gaksadeungnok』 is still very meaningful and of practical use, for it contains plenty of the local data throughout the whole country during the latter part of Joseon Dynasty. Therefore, further studies are strongly recommended on the restoration of climate related data and on the climatic tendency of 19th century of Korean peninsular.

Restoration and Analysis of Chugugi Rainfall Data by 『Gaksadeungnok』 for Gyeonggi Province During the Latter Part of the Joseon Dynasty (1830~1893)