Temporal and spatial variability of CZCS-derived phytoplankton pigment concentrations off the western Iberian Peninsula

A total of 722 Coastal Zone Color Scanner (CZCS) images obtained during 1979-1985 were used to investigatethe variability of surface phytoplankton in the Portugal Current System off western Iberia. Seasonal fluctuations of pigment biomass are clearly identified with amplitudes and phases varying from the shelf offshore and also with latitude. Interannual fluctuations are also present. The spatial distribution of phytoplankton varies strongly with topographic constraints and dynamical factors, such as the topography of the shelf and upper slope, pronounced coastline features, stratification due to the heating-cooling seasonal cycle and to river runoff, fronts, coastal upwelling, mesoscale filaments and jet-like structures, and surface currents. Surface pigment biomass is generally higher in the north, mainly in relation to the Galicia Front, and on the shelf, especially in winter (due to stratification and nutrient enrichment induced by river outflow) and in summer (as a result of coastal upwelling). Waven...

[1]  Guerreiro,et al.  Climatological space and time-variation of the portuguese coastal upwelling , 1982 .

[2]  Annick Bricaud,et al.  Satellite-derived phytoplankton pigment structures in the Portuguese upwelling area , 1992 .

[3]  B. Sturm,et al.  CZCS data analysis in turbid coastal water , 1984 .

[4]  F. Huang,et al.  Comparison of the seasonal and interannual variability of phytoplankton pigment concentrations in the Peru and California Current systems , 1994 .

[5]  P. Strub,et al.  Seasonal and nonseasonal variability of satellite‐derived surface pigment concentration in the California Current , 1990 .

[6]  A. Morel,et al.  Pigment distribution and primary production in the western Mediterranean as derived and modeled from coastal zone color scanner observations , 1991 .

[7]  S. Chao,et al.  Wind‐driven upwelling in the vicinity of Cape Finisterre, Spain , 1986 .

[8]  A. Morel,et al.  Surface pigments, algal biomass profiles, and potential production of the euphotic layer: Relationships reinvestigated in view of remote‐sensing applications , 1989 .

[9]  T. Viehoff.  Mesoscale variability of sea surface temperature in the North Atlantic , 1989 .

[10]  J. André.  Ocean color remote-sensing and the subsurface vertical structure of phytoplankton pigments , 1992 .

[11]  K. Denman,et al.  Time scales of pattern evolution from cross‐spectrum analysis of advanced very high resolution radiometer and coastal zone color scanner imagery , 1994 .

[12]  D. Chelton,et al.  Advances in passive remote sensing of the ocean , 1991 .

[13]  A. Morel.  Optical modeling of the upper ocean in relation to its biogenous matter content (case I waters) , 1988 .

[14]  Problems in the meso-scale interpretation of satellite chlorophyll data , 1993 .

[15]  N. Lomb.  Least-squares frequency analysis of unequally spaced data , 1976 .

[16]  J. Michaelsen,et al.  Variability of pigment biomass in the California Current System as determined by satellite imagery: 2. Temporal variability , 1988 .

[17]  R. Frouin,et al.  Observations of a poleward surface current off the coasts of Portugal and Spain during winter , 1990 .

[18]  Warren S. Wooster,et al.  SEASONAL UPWELLING CYCLE ALONG THE EASTERN BOUNDARY OF THE NORTH ATLANTIC. , 1976 .