The grade reconstruction of 17111911 precipitation during the rainy season in Kunming and its preliminary study:a exploitation of archives
17111911年昆明雨季降水的分级重建与初步研究

There were almost 4000 items about precipitation, disasters and harvest of Kunruing in the archives of the Qing period. Using these materials and other historical documents, based on analysis of periodical characteristics of modern precipitation, the series of precipitation grades in Kunming during 1711-1911 is reconstructed. System deviations are modified successfully by means of the rectification measures. Comparison of the dryness/ wetness grade with precipitation grade indicates that the series of precipitation grades can express precipitation of the rainy season more actually. The analysis indicates that the 201 years from 1711 to 1911 can be divided into four phases according to the precipitation of the rainy season in Kunming, and the amount of precipitation during the 18th century is slightly lower than that during the 19th century . This indicates that the amount of the 1870s is the maximum through comparison with the series of Indian monsoon precipitation based on the Himalayas Dasuopu ice core, and the amount of the second half of the 19th century fluctuates more obviously in both series. However, the amount of precipitation during the last 30 years of the 18th century is higher in Kunming, but is lower during the 18th century, all indicated by the precipitation series of Dasuopu ice core. The Characteristic of monsoon precipitation in the Yunnan Plateau is unique. Two peaks of 90a macula cycle correspond with the two peaks of the series of precipitation grades in Kunming, the 90a solar activity cycle affects the precipitation of rainy season in Kunming possibly. It is help ful to extend the area of reconstructing the highresolution series of historical climate by exploiting and utilizing medium resolution materials.