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Hydrology and Earth System Sciences (HESS)
Article . 2025 . Peer-reviewed
License: CC BY
Data sources: Crossref
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Global catalog of soil moisture droughts over the past four decades

Authors: J. Řehoř; J. Řehoř; R. Brázdil; R. Brázdil; O. Rakovec; O. Rakovec; M. Hanel; +14 Authors

Global catalog of soil moisture droughts over the past four decades

Abstract

Abstract. At the global scale, droughts can be described by many variables, expressing their extent, duration, dynamics, and severity. To identify common features in global land drought events (GLDEs) based on soil moisture, we present a robust method for their identification and classification (cataloging). Gridded estimates of root-zone soil moisture from the SoilClim model and the mesoscale Hydrologic Model (mHM) were calculated over global land from 1980–2022. Using the 10th-percentile thresholds of soil moisture anomalies and OPTICS clustering of the gridded data in a 10 d interval, a total of 775 GLDEs from SoilClim and 630 GLDEs from mHM were identified. By utilizing four spatiotemporal and three motion-related characteristics for each GLDE, we established threshold percentiles based on their distributions. This information enabled us to categorize droughts into seven severity categories (ranging from extremely weak to extremely severe) and seven dynamic categories (ranging from extremely static to extremely dynamic). Our global-scale synthesis revealed the highest relative proportions of extremely severe and extremely dynamic GLDEs in the South American region, followed by North America, while the longest and most extensive single GLDEs occurred in Eurasia. The severity and dynamic categories overlapped substantially for extremely severe and extremely dynamic droughts but very little for less severe/dynamic categories, despite some very small droughts that were occasionally very dynamic. The frequency of GLDEs has generally increased in recent decades across different drought categories but is statistically significant only in some cases. Overall, the cataloging of GLDEs presents a unique opportunity to analyze the evolving features of spatiotemporally connected drought events in recent decades and provides a basis for future investigations of the drivers and impacts of dynamically evolving drought events.

Keywords

G, Environmental sciences, Technology, model, Soil Moisture; Drought; Catalog; Classification; SoilClim; mHM, frequency, T, world, reanalysis, Geography. Anthropology. Recreation, GE1-350, Environmental technology. Sanitary engineering, TD1-1066

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
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gold