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Nature Research, Nature Communications, 1(6), 2015

DOI: 10.1038/ncomms7443

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Reconciling spatial and temporal soil moisture effects on afternoon rainfall

Journal article published in 2015 by Benoit P. Guillod ORCID, Boris Orlowsky, Diego G. Miralles ORCID, Adriaan J. Teuling, Sonia I. Seneviratne
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractSoil moisture impacts on precipitation have been strongly debated. Recent observational evidence of afternoon rain falling preferentially over land parcels that are drier than the surrounding areas (negative spatial effect), contrasts with previous reports of a predominant positive temporal effect. However, whether spatial effects relating to soil moisture heterogeneity translate into similar temporal effects remains unknown. Here we show that afternoon precipitation events tend to occur during wet and heterogeneous soil moisture conditions, while being located over comparatively drier patches. Using remote-sensing data and a common analysis framework, spatial and temporal correlations with opposite signs are shown to coexist within the same region and data set. Positive temporal coupling might enhance precipitation persistence, while negative spatial coupling tends to regionally homogenize land surface conditions. Although the apparent positive temporal coupling does not necessarily imply a causal relationship, these results reconcile the notions of moisture recycling with local, spatially negative feedbacks.