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本文以长江中下游地区的七个省市为研究对象 ,利用方志资料 ,在有记载的年份中从各省市每年只取一条资料 ,按照资料冷暖程度分别赋予一定的值 ,以十年为单位 ,将这些值相加 ,然后将所得的总数除以 10 ,本文称之为温度指数 ,共得到 4 6个温度指数值 ,取其平均数 1.7为参数 ,大致可将明清时期 (14 4 0年到 1899年 )冬季异常气候变化的过程分为三个暖时段 ,即 14 4 0 -14 89年 ,15 2 0 - 16 19年和 172 0 - 1789年 ;三个冷时段即 14 90 - 15 19年 ,16 2 0 - 1719年和 1790 -1899年。无论在暖时段还是冷时段 ,总存在着与之相反的极端个别或一些年份的冷或暖的回旋。如在第二个暖时段中 15 6 0年至 15 6 9年、第三个暖时段中 174 1至 174 6年冷冬的回旋和在第二个冷时段中 170 0至 170 9年、第三个冷时段中 185 0至 185 9年暖冬的回旋
In this paper, seven provinces and cities in the middle and lower reaches of the Yangtze River as the research object, the use of local records, in the recorded years from each province and city only one year to take information, according to the degree of information given a certain degree of value, with ten years as a unit, These values are added, and then the total number divided by 10, referred to herein as the temperature index, a total of 46 temperature index values, taking an average of 1.7 as a parameter, roughly the Ming and Qing Dynasties (14 40 years To 1899) The process of winter anomalous climate change is divided into three warm periods, 1440-1989, 1520-16 years and 172 0-1789; three cold periods, 1490-1519 Year, 16-20-1719 and 1790-1899. There are always cold or warm maneuvers in the opposite extreme or individual years, both in warm and cold periods. For example, in the second warm period of 1560 to 1569, the third warm period of 174-1746 cold winter maneuver and in the second cold period of 170 0-1709 years, the first Rounds of warm winter from 185 0 to 185 9 in three cold periods