Abstract
AbstractLong series of climate observations are essential to understand past and present climate change. However, the study of climate change from raw instrumental data poses a number of specific problems. Firstly, any observations are likely to contain erroneous values. Secondly, measurement conditions have generally changed over time which may introduce artificial breaks in the data that do not reflect the real variations of the climate. This article presents a new dataset of quality controlled and homogenized monthly precipitation series for Belgium. After in‐depth data quality control, monthly precipitation time series have been homogenized with the HOMER software on the basis of available metadata. Homogenization results are provided for 110 series over the period 1951–2019 and for 18 series starting before 1912 including nine covering the full time period 1880–2019. The new dataset of monthly homogenized series allows us to make a robust analysis of the precipitation evolution in Belgium from 1880 to nowadays. The comparison between the average of the last 30 years (1990–2019) with that of the first 30 years (1880–1909) of the considered time period, reveals an average increase in precipitation in the order of 15.5%. However, this average representation of the increase masks important seasonal and regional differences across Belgium.
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