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Historical Records

Posted by Chris Shrestha

Historical Records

Historical records is one the necessity for reconstruct of climate so historical records have been used to reconstruct climates back to thousand years. Historical data can be observe in 3 major categories. Firstly, there are some observations of weather phenomena per sa, i.e the timing and frequency of frosts, or the snowfall occurence. Secondly, there are another observation of weather-dependent environment phenomena i.e drought, floods, and other climate base problems. Finally, there are phenological observation of weather-dependent biological phenomena i.e the migration of birds, the flowering of trees.

Some major sources of historical palaeclimate information include: ancient inscriptions; annals and chronicles; government recors; fragmented olden instrumental records; diaries and correspondence; scientific or quasi-scientific writings and so on.

There could be a lot of difficulties using these kinds of information. First, to understand what the author actually meant in describing the particular event. How "severe" frost could actually be severe? What does drought precisely means? A standard historical technique has been used assess, in quantitative terms.

Secondly, the account's reliability has to be assessed. It is compulsory to check whether the author has direct evidence on the meteorological events. Thirdly, it is necessary to consult about the date and information exactly accurately. This involves whether the event is a localised occurrence or can its spatial event be explained by preference to other source.

Finally, the data should be with all proxy records, interrelated against recent events and cross reference with data of instrument. This can be done by measuring through indices, which is directly related with analogous records derived from instrument data.


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