Reconstruction of paleo-temperature series based on historical documents

Ten-year mean seasonal and annual temperature anomaly series were reconstructed on the basis of historical documents. The cold events such as snowing, .freezing and anomalous frosts were calibrated by use of modern temperature observations, to determine the severity index of each kind of the events.The severity indices were integrated for each decade from 1380s to 1980s in the northern and eastern China respectively. Then,the severity index series were transformed, into decadal temperature anomalies.

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