The Use Of Historical Documents In Researches On "the Climate Change During The Historical Period"

The research on climate change during the historical period is an important issue of climate change researches. Past Global Changes (PAGES) is one of the core projects under frameworks of the International Geosphere-Biosphere Program (IGBP), in which the research on climate change during the historical period is hot. There are plenty of relevant aricles and essays in this research feild. Through acquirement of the changing rule of "The climate change during the historical period" can scholars understand the development tendency of this field under the global change in future, get more summaries of the relevant theory and method and make further contribution to the research of history of science and technology."The historical documents" is the key as the theme to this research. We discuss the use of historical documents and the evolvement of the subject in the perspective of the history of science and technology. The main contents include the following aspects:First, the author introduces the basis and significance of the topic, generalizes related researches at home and abroad, describes the methods and data sources of the research and summarizes the main content and structure of the study.Then, the author tries to define the concepts of the keywords in "The climate change during the historical period", such as basic research methods, the time and classification of historical documents. We also discuss the reasons, development and main achievements in the subject.The writer first respectively classifies and introduces the utilization of the historical documents and the reconstructive method of research on historical period climate change and explores its changing process. Elaborate analyses are made on its utilization separately from the four categories documents, official and private documents, chorography, archives, and diary, which also include those of the type, distribution and value or other features of climatologically. Through this essay can we discover the relationship among the documents type and the quantity with time as well as the regularities distribution of proxy in different documents through the summary of the utilization of those documents. According to the character of the subject research method, the writer classifies the subject research method that historical period climate change have used into three method systems, quantitative analysis, semi-qualitative grading, quantity transformation. In the aspect of method utilization, the writer expounds the method and its utilization that temperature reconstruction, precipitation reconstruction, other elements (sand storm, plum rain period, disaster event et al) reconstruction have used in order to get the laws how the methods are processed with the varies of time.On the base of the preceding chapters, the author analyzes the characteristics, routing and problems in the historical documents and method field, which can help us to find the reasons that promote the subject. The author tries to solve the problems during the search, which can provide reference functions to climate research and promote further devetopment on the subject.Finally, the author summarizes for further clarification of the historical and current situation in "The climate change during the historical period", which emphasizes the importance of this study.