Articles | Volume 19, issue 8
https://doi.org/10.5194/nhess-19-1629-2019
https://doi.org/10.5194/nhess-19-1629-2019
Research article
 | 
06 Aug 2019
Research article |  | 06 Aug 2019

Impact of the dry-day definition on Mediterranean extreme dry-spell analysis

Pauline Rivoire, Yves Tramblay, Luc Neppel, Elke Hertig, and Sergio M. Vicente-Serrano

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Cited articles

Allen, R. G., Pereira, L. S., Raes, D, and Smith, M.: Crop evapotranspiration, guidelines for computing crop water requirements, in: Irrigation and drain, Paper No. 56, FAO, Rome, 300 pp., 1998. 
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Anderegg, W. R. L., Klein, T., Bartlett, M., Sack, L., Pellegrini, A. F. A., Choat, B., and Jansen, S.: Meta-analysis reveals that hydraulic traits explain cross-species patterns of drought-induced tree mortality across the globe, P. Natl. Acad. Sci. USA, 113, 5024–5029, https://doi.org/10.1073/pnas.1525678113, 2016. 
Beguería, S., Vicente-Serrano, S. M., Reig, F., and Latorre, B.: Standardized precipitation evapotranspiration index (SPEI) revisited: parameter fitting, evapotranspiration models, tools, datasets and drought monitoring, Int. J. Climatol., 34, 3001–3023, 2014. 
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Short summary
In order to define a dry period, a threshold for wet days is usually considered to account for measurement errors and evaporation. In the present study, we compare the threshold of 1 mm d−1, the most commonly used threshold, to a time-varying threshold describing evapotranspiration to compare how the risk of extreme dry spells is estimated with both thresholds. Results indicate that considering a fixed threshold can underestimate extreme dry spells during the extended summer.
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