@article{PAR00000401,
  title = {{P}roduction regimes in the northeast {A}tlantic : a study based on {S}ea-viewing {W}ide {F}ield-of-view {S}ensor ({S}ea{W}i{FS}) chlorophyll and ocean general circulation model mixed layer depth [art. no. {C}07{S}10]},
  author = {{L}{\'e}vy, {M}. and {L}ehahn, {Y}. and {A}ndr{\'e}, {J}ean-{M}ichel and {M}emery, {L}. and {L}oisel, {H}. and {H}eifetz, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {[1] {A} 5 year time series of {S}ea-viewing {W}ide {F}ield-of-view {S}ensor ({S}ea{W}i{FS}) ocean color images ({SCHL}) is compared with mixed layer depths ({MLD}) and atmospheric forcings from the {C}lipper model of the {N}orth {A}tlantic ( 1998 - 2002). {T}his comparison is done over the region 16 degrees - 22 degrees {W}, 30 degrees - 50 degrees {N}, where subpolar mode waters are formed and which overlaps the region of the 2001 {P}rogramme {O}cean {M}ultidisciplinaire {M}eso {E}chelle ({POMME}) experiment at sea. {T}hree production regimes are identified on the basis of the seasonal cycling of {SCHL} and {MLD}: the well-known subpolar and subtropical regimes and a midlatitude regime. {T}he midlatitude regime is characterized by a single broad bloom weaker than the subpolar spring bloom and stronger than the subtropical fall bloom, which starts in fall as an entrainment bloom and peaks in spring as a restratification bloom. {T}his specific regime is found between 35 degrees {N} and 40 degrees {N} (+/- 2 degrees) in the northeast {A}tlantic. {I}t corresponds to winter {MLD}s between {Z}e ( the depth of the euphotic layer) and 2{Z}e, i.e., it lays between the region where the winter {MLD} is greater than {S}verdrup's critical depth ( subpolar regime) and the region where the mixing is never deeper than the well-lit layer ( subtropical regime). {T}he very specific characteristics of the midlatitude regime strengthen the biological carbon pump since production is active in winter within the waters to be subducted. {T}he midlatitude regime also may provide an explanation for the unexpectedly low f ratios sometimes observed during the bloom in the region ( {N}orth {A}tlantic {B}loom {E}xperiment, {POMME}). {A} large interannual variability is observed for the three regimes in terms of the timing and the intensity of the blooms and of the geographical boundaries of the regimes. {T}hese variabilities appear to be mainly driven by the synoptic and the low-frequency atmospheric variabilities. {I}t is also shown that in addition to the northward propagation of the subpolar spring bloom from 41 degrees {N} ( +/- 1.3 degrees) to 50 degrees {N}, the ( fall) entrainment bloom propagates southward over the whole latitudinal range (35 degrees - 50 degrees {N}).},
  keywords = {{ATLANTIQUE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch {O}ceans},
  volume = {110},
  numero = {{C}7},
  pages = {{NIL}_85--{NIL}_103},
  ISSN = {0148-0227},
  year = {2005},
  DOI = {10.1029/2004{JC}002771},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00000401},
}