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DOCU-CLIM: A global documentary climate dataset for climate reconstructions.

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This study introduces DOCU-CLIM, the first global collection of documentary climate records. These historical documents offer valuable insights into past temperature, precipitation, and wind variations, especially where instrumental data is scarce.

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Area of Science:

  • Climatology
  • Historical Research
  • Data Science

Background:

  • Documentary climate data, derived from historical records like diaries and newspapers, have been used to reconstruct local and regional climates.
  • A comprehensive global dataset of such documentary climate time series has been lacking, limiting their use in large-scale climate reconstructions.
  • Existing climate reconstructions often rely on instrumental data and paleoclimate proxies, which have spatial and temporal limitations.

Purpose of the Study:

  • To compile the first global, multi-variable collection of documentary climate records, named DOCU-CLIM.
  • To evaluate the reliability and potential of documentary climate records for historical climate reconstruction.
  • To assess the correlation between documentary climate data and climate fields using proxy forward models.

Main Methods:

  • Compilation of 621 published and unpublished documentary climate time series covering temperature, precipitation, and wind regime variations.
  • Development and application of proxy forward models to predict documentary observations from climate fields.
  • Evaluation of model performance using an overlapping historical period for correlation analysis.

Main Results:

  • Strong correlations were observed between documentary climate records and climate fields, particularly for temperature-sensitive series.
  • Precipitation-sensitive series showed somewhat lower, yet significant, correlations.
  • The study demonstrates the considerable potential of documentary records as a valuable data source for climate studies.

Conclusions:

  • Documentary climate records, as exemplified by the DOCU-CLIM dataset, are a significant data source for understanding past climate variability.
  • These records are especially crucial for regions and seasons underrepresented by early instrumental data and paleoclimate proxies.
  • The findings support the integration of documentary climate data into global climate reconstruction efforts.