@article{fdi:010073082,
  title = {{D}aily weather types in february-june (1979-2016) and temperature variations in tropical {N}orth {A}frica},
  author = {{M}oron, {V}. and {O}ueslati, {B}. and {P}ohl, {B}. and {J}anicot, {S}erge},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his study investigates to what extent weather types ({WT}s) computed over tropical {N}orth {A}frica and the tropical {N}orth {A}tlantic {O}cean (40 degrees {W}-40 degrees {E}, 0 degrees-30 degrees {N}) are relevant for documenting intraseasonal and interannual temperature variability in tropical {N}orth {A}frica (west of 37 degrees {E}, 2 degrees-27 degrees {N}). {N}ine {WT}s are extracted by using clustering analysis of the daily anomalies of sea level pressure and low-level 925-h{P}a winds from two reanalyses ({NCEP}-{DOE} and {ERA}-{I}nterim) from 1979 to 2016. {T}he analyses are carried out separately for {F}ebruary-{M}arch and for {A}pril-{J}une, when temperatures reach their annual peak across most of the region. {T}he {WT} patterns mix the effects of different multiscale phenomena, including the extratropical {R}ossby waves that travel on the northern edge of the domain (and are partly related to the {N}orth {A}tlantic {O}scillation), the {M}adden-{J}ulian oscillation, and {K}elvin waves in the subequatorial zone. {F}or each {WT}, warm (cold) minimum ({TN}) and maximum ({TX}) daily temperature anomalies tend to be systematically located east of cyclonic (anticyclonic) low-level circulation anomalies associated with the {WT} patterns. {B}y modulating the greenhouse effect, the water vapor anomalies exert a major influence, leading to warm (cold) {TX} and {TN} anomalies associated with moister (drier) air, through advection from the tropical {A}tlantic or equatorial latitudes (the {S}ahara or northern latitudes) toward tropical {N}orth {A}frica. {WT}s are also useful for monitoring interannual variability of {TX}/{TN} anomalies mostly north of 10 degrees {N} in {F}ebruary-{M}arch, even if they greatly underestimate the long-term warming trend. {M}ost {WT}s significantly raise or lower the probability of regional-scale heat peaks, defined as the crossing of the 90th percentile of daily {TX} or {TN}.},
  keywords = {{AFRIQUE} {DU} {NORD} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{J}ournal of {A}pplied {M}eteorology and {C}limatology},
  volume = {57},
  numero = {5},
  pages = {1171--1195},
  ISSN = {1558-8424},
  year = {2018},
  DOI = {10.1175/jamc-d-17-0105.1},
  URL = {https://www.documentation.ird.fr/hor/fdi:010073082},
}