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Articles by V Martinez Vicente
Total Records ( 2 ) for V Martinez Vicente
  T. J Smyth , J. R Fishwick , L AL Moosawi , D. G Cummings , C Harris , V Kitidis , A Rees , V Martinez Vicente and E. M. S. Woodward
 

The marine laboratories in Plymouth have sampled at two principle sites in the Western English Channel for over a century in open-shelf (station E1; 50° 02'N, 4° 22'W) and coastal (station L4; 50° 15'N, 4° 13'W) waters. These stations are seasonally stratified from late-April until September, and the variable biological response is regulated by subtle variations in temperature, light, nutrients and meteorology. Station L4 is characterized by summer nutrient depletion, although intense summer precipitation, increasing riverine input to the system, results in pulses of increased nitrate concentration and surface freshening. The winter nutrient concentrations at E1 are consistent with an open-shelf site. Both stations have a spring and autumn phytoplankton bloom; at station E1, the autumn bloom tends to dominate in terms of chlorophyll concentration. The last two decades have seen a warming of around 0.6°C per decade, and this is superimposed on several periods of warming and cooling over the past century. In general, over the Western English Channel domain, the end of the 20th century was around 0.5°C warmer than the first half of the century. The warming magnitude and trend is consistent with other stations across the north-west European Shelf and occurred during a period of reduced wind stress and increased levels of insolation (+20%); these are both correlated with the larger scale climatic forcing of the North Atlantic Oscillation.

  V Martinez Vicente , P. E Land , G. H Tilstone , C Widdicombe and J. R. Fishwick
 

The seasonality of the mass specific scattering and backscattering by different components of the suspended particulate matter (SPM) was investigated at a coastal station in the Western English Channel. This study considered different components of the SPM, including inorganic and organic suspended matter, chlorophyll a and six phytoplankton groups. The data set comprised a 9-year time series of observations at station L4. Scattering variability was best explained by the particulate organic matter content, with significant differences between spring–summer and autumn–winter. Particulate backscattering variability was best explained by the inorganic fraction, with no clear seasonal variation. The temporal variations of the spectral slopes of these optical properties were related to the particle composition and size distribution slope.

 
 
 
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