@article{fdi:010060260,
  title = {{Q}uasi-decadal signals of {S}ahel rainfall and {W}est {A}frican monsoon since the mid-twentieth century},
  author = {{D}ieppois, {B}. and {D}iedhiou, {A}rona and {D}urand, {A}. and {F}ournier, {M}. and {M}assei, {N}. and {S}ebag, {D}avid and {X}ue, {Y}. and {F}ontaine, {B}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ahel rainfall shows pronounced decadal variability and a negative trend between wet conditions in the 1950s1960s and dry ones in the 1970s1980s. {U}sing continuous wavelet transform, the quasi-decadal variability ({QDV}) of rainfall reveals zonal contrasts. {T}he highest {QDV} is identified in the 1950s1960s over western {S}ahel and in the 1970s1980s over eastern {S}ahel. {T}he quasi-decadal atmospheric anomalies have been reconstructed using {F}ourier transform for the 1950s1960s and the 1970s1980s, respectively, and assessed by the composite analysis of the {QDV} phases for the periods before and after 1968. {O}ver western {S}ahel, the rainfall {QDV} in the 1950s1960s is related to the {N}orth {A}tlantic sea surface temperature ({SST}) variability, as highlighted by the wavelet coherence. {A} southward shift trend of the {I}ntertropical {C}onvergence {Z}one ({ITCZ}) is identified through an enhancement of northeasterly fluxes and moisture convergence over the western part of {W}est {A}frica. {A} decrease (increase) of southern (northern) subtropical sinking motions seems to be involved. {I}n the 1970s1980s, a strengthening of cross-equatorial {A}tlantic {SST} and pressure gradients is related to an increase of monsoon flow from lower troposphere up to the midtroposphere and to the northward shift of the {ITCZ}, mainly over eastern {S}ahel. {T}he {P}acific {SST} influence is also identified, which involves changes in the global zonal circulation.},
  keywords = {{PRECIPITATION} ; {VARIATION} {SPATIALE} ; {VARIATION} {TEMPORELLE} ; {TEMPERATURE} {DE} {SURFACE} ; {INTERACTION} {OCEAN} {ATMOSPHERE} ; {HUMIDITE} {DE} {L}'{AIR} ; {CIRCULATION} {ATMOSPHERIQUE} ; {METHODOLOGIE} ; {ANALYSE} {STATISTIQUE} ; {CHANGEMENT} {CLIMATIQUE} ; {MOUSSON} ; {SERIE} {CHRONOLOGIQUE} ; {AFRIQUE} {DE} {L}'{OUEST} ; {ZONE} {SAHELIENNE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch.{A}tmospheres},
  volume = {118},
  numero = {22},
  pages = {12,587--12,599},
  ISSN = {2169-8996},
  year = {2013},
  DOI = {10.1002/2013{JD}019681},
  URL = {https://www.documentation.ird.fr/hor/fdi:010060260},
}