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- W2807827521 abstract "Recent observational studies have demonstrated the relevance of soil moisture heterogeneity and the associated thermally-induced circulation on deep convection and rainfall triggering. However, whether this dynamical mechanism further influences rainfall properties—such as rain volume or timing—has yet to be confirmed by observational data. Here, we analyze 10 years of satellite-based sub-daily soil moisture and precipitation records and explore the potential of strong spatial gradients in morning soil moisture to influence the properties of afternoon rainfall in the North African region, at the 100-km scale. We find that the convective rain systems that form over locally drier soils and anomalously strong soil moisture gradients have a tendency to initiate earlier in the afternoon; they also yield lower volumes of rain, weaker intensity and lower spatial variability. The strongest sensitivity to antecedent soil conditions is identified for the timing of the rain onset; it is found to be correlated with the magnitude of the soil moisture gradient. Further analysis shows that the early initiation of rainfall over dry soils and strong surface gradients yet requires the presence of a very moist boundary layer on that day. Our findings agree well with the expected effects of thermally-induced circulation on rainfall properties suggested by theoretical studies and point to the potential of locally drier and heterogeneous soils to influence convective rainfall development. The systematic nature of the identified effect of soil moisture state on the onset time of rainstorms in the region is of particular relevance and may help foster research on rainfall predictability." @default.
- W2807827521 created "2018-06-21" @default.
- W2807827521 creator A5010552496 @default.
- W2807827521 creator A5015861348 @default.
- W2807827521 creator A5030207043 @default.
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- W2807827521 date "2018-06-17" @default.
- W2807827521 modified "2023-09-30" @default.
- W2807827521 title "Relation between Convective Rainfall Properties and Antecedent Soil Moisture Heterogeneity Conditions in North Africa" @default.
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- W2807827521 doi "https://doi.org/10.3390/rs10060969" @default.
- W2807827521 hasPublicationYear "2018" @default.
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