@article{fdi:010042627, title = {{S}easonal and intraseasonal surface chlorophyll-a variability along the northwest {A}frican coast - art. no. {C}05007}, author = {{L}athuiliere, {C}. and {E}chevin, {V}incent and {L}{\'e}vy, {M}.}, editor = {}, language = {{ENG}}, abstract = {{F}ive years of {S}ea{W}i{FS} ocean color data are used to characterize the variability of surface chlorophyll ({SCHL}) over seasonal and intraseasonal timescales along the northwest {A}frican coast (between 10 degrees {N} and 33 degrees {N}). {T}his variability is interpreted in regards of remotely sensed wind stress and sea surface temperature and of climatological surface nitrate concentration. {T}hree regions with fairly different behaviors are identified: the region of the subtropical gyre (24 degrees {N}-33 degrees {N}) is characterized by a weak seasonality and chlorophyll confined at the coast. {T}he inter-gyre region off {C}ape {B}lanc (19 degrees {N}-24 degrees {N}) is characterized by a weak seasonality and a persistent large offshore extension of chlorophyll. {T}he region of the recirculation gyre (10 degrees {N}-19 degrees {N}) is characterized by a strong seasonality and a large offshore extension of chlorophyll from {F}ebruary to {M}ay followed by an abrupt chlorophyll drop that propagates northward from {M}ay to {J}une. {T}he seasonal variability is well explained by the seasonal variability in wind-forcing. {N}utrient limitation is the key factor that explains the weak offshore extension of chlorophyll in the {N}orth. {T}he chlorophyll drop in the {S}outh is attributed to the weakening of the wind-forcing and the simultaneous advection of warm water from the {S}outh by a coastal and seasonal branch of the {N}orth {E}quatorial {C}ounter {C}urrent ({NECC}). {I}ntraseasonal variability is present in all regions. {T}he cases of good correlation between the intraseasonal variability of the chlorophyll and of the wind-forcing are found to be associated with weak chlorophyll offshore extension and large nutrient limitation.}, keywords = {{ATLANTIQUE} ; {AFRIQUE}}, booktitle = {}, journal = {{J}ournal of {G}eophysical {R}esearch {O}ceans}, volume = {113}, numero = {{C}5}, pages = {{NIL}_27--{NIL}_38}, ISSN = {0148-0227}, year = {2008}, DOI = {10.1029/2007{JC}004433}, URL = {https://www.documentation.ird.fr/hor/fdi:010042627}, }