@article{fdi:010088907,
  title = {{T}oward a redefinition of agricultural drought periods : a case study in a {M}editerranean semi-arid region},
  author = {{O}ukaddour, {K}. and {L}e {P}age, {M}ichel and {F}akir, {Y}.},
  editor = {},
  language = {{ENG}},
  abstract = {{D}rought is a powerful natural hazard that has significant effects on ecosystems amid the constant threats posed by climate change. {T}his study investigates agricultural drought in a semi-arid {M}editerranean basin through the interconnections among four indices: precipitation (meteorological reanalysis), vegetation development, thermal stress, and soil water deficit (remote sensing observations). {W}hile drought seems to be a clear concept with effective assessment tools (e.g., {SPI} and {SPEI}), the definition of drought periods is blurrier. {T}his article examines the main drivers of agricultural drought, precipitation, soil moisture deficit, incipient vegetation development, and rising soil surface temperature. {T}heir temporal connections in various agrosystems of the basin and the determination of drought periods by revisiting the run theory were investigated. {T}he {P}earson correlations at different spatial scales showed a medium to low level of agreement between the indices, which was explained by the geographical heterogeneity and the climatic variability between the agrosystems within the basin. {I}t was also shown that the cascade of impacts expected from lower precipitations was revealed by the cross-correlation analysis. {T}he connection between precipitation deficit and vegetation remains significant for at least one month for most pairs of indices, especially during drought events, suggesting that agricultural drought spells can be connected in time through the three or four selected indices. {S}hort-, mid-, and long-term impacts of precipitation deficiencies on soil moisture, vegetation, and temperature were revealed. {A}s expected, the more instantaneous variables of soil moisture and surface temperature showed no lag with precipitation. {V}egetation anomalies at the monthly time step showed a two-month lag with a preceding effect of vegetation to precipitation. {F}inally, the determination of drought events and stages with varying thresholds on the run theory showed large variability in duration, magnitude, and intensity according to the choice of both normality and dryness thresholds.},
  keywords = {drought indices ; remote sensing ; run theory ; drought spells ; {T}ensift basin ; {MAROC} ; {ZONE} {SEMIARIDE}},
  booktitle = {},
  journal = {{R}emote {S}ensing},
  volume = {16},
  numero = {1},
  pages = {83 [24 ]},
  year = {2024},
  DOI = {10.3390/rs16010083},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088907},
}