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The role of metadata and strategies to detect and control temporal data bias in environmental monitoring of soil contamination

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Abstract

It is crucial for environmental monitoring to fully control temporal bias, which is the distortion of real data evolution by varying bias through time. Temporal bias cannot be fully controlled by statistics alone but requires appropriate and sufficient metadata, which should be under rigorous and continuous quality assurance and control (QA/QC) to reliably document the degree of consistency of the monitoring system. All presented strategies to detect and control temporal data bias (QA/QC, harmonisation/homogenisation/standardisation, mass balance approach, use of tracers and analogues and control of changing boundary conditions) rely on metadata. The Will Rogers phenomenon, due to subsequent reclassification, is a particular source of temporal data bias introduced to environmental monitoring here. Sources and effects of temporal data bias are illustrated by examples from the Swiss soil monitoring network. The attempt to make a comprehensive compilation and assessment of required metadata for soil contamination monitoring reveals that most metadata are still far from being reliable. This leads to the conclusion that progress in environmental monitoring means further development of the concept of environmental metadata for the sake of temporal data bias control as a prerequisite for reliable interpretations and decisions.

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Acknowledgements

The author thanks his colleague Hans Jörg Bachmann and the reviewers for their comments. This study was fully financed by the Swiss Government.

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  1. Agroscope Reckenholz-Tänikon Research Station (ART), Zurich, Switzerland

    André Desaules

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  1. André Desaules
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Desaules, A. The role of metadata and strategies to detect and control temporal data bias in environmental monitoring of soil contamination. Environ Monit Assess 184, 7023–7039 (2012). https://doi.org/10.1007/s10661-011-2477-9

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