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The spatial and temporal development of the spring bloom during the JGOFS North Atlantic Bloom Experiment, 1989


The spatial and temporal development of the spring bloom during the JGOFS North Atlantic Bloom Experiment, 1989



Journal of the Marine Biological Association of the United Kingdom 73(2): 253-282



ISSN/ISBN: 0025-3154

DOI: 10.1017/s0025315400032847

The south to north development of the spring bloom in the North Atlantic Ocean was observed during four cruises from April to August 1989. Transects with towed undulating instrumentation packages and CTD profiles on station were made between 42 degree N and 54 degree N, along 17 degree W and 20 degree W in April and between 47 degree N and 60 degree N along 20 degree N in May, June and July/August, giving vertical sections of temperature and chlorophyll concentration derived from in vivo fluorescence. These sections show the relationship between the onset of seasonal stratification and the initiation of the spring bloom. Supporting data from microscopic analysis of the major phytoplankton species show that the seasonal succession commenced with diatoms, followed in turn by coccolithophores, flagellates and dinoflagellates. During the development of summer stratification the mesoscale distribution of chlorophyll was strongly determined by the depth of the mixed layer, but once stratification had been firmly established higher chlorophyll values tended to be found within the warmer eddies (meanders). One possible explanation of this result is that phytoplankton growth is higher in the warmer eddies.

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Accession: 009626860

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