Nitrate utilization in surface waters of the Iceland Basin during spring and summer of 1989

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Sambrotto, R. N., Martin, J. H., Broenkow, W. W., Carlson, C., & Fitzwater, S. E. (1993). Nitrate utilization in surface waters of the Iceland Basin during spring and summer of 1989. Deep-Sea Research Part II, 40(1), 441-457.
Metadata
TitleNitrate utilization in surface waters of the Iceland Basin during spring and summer of 1989
AuthorsN. Sambrotto, H. Martin, W. Broenkow, C. Carlson, E. Fitzwater
AbstractOceanographic sampling at 59.5°N, 21°W over the spring and summer months of 1989 provided the basis to quantify the amount of new (nitrate) production and to evaluate the effect of selected environmental factors on new production. Surface water nitrate decreased linearly from 14μM in early April to ∼2.5 μM in August, and suggested that new production averaged 5.4 mmol NO 3 m -2 day -1, almost double the rate suggested by a similar analysis at Ocean Weather Sta. P. Equivalent carbon export in the northern Iceland Basin would be 63 g C m -2 over this period. During a week in early July, it appeared that regenerated production compensated for a sharp decrease in new production to maintain carbon productivity at a fairly consistent level despite a decrease in F-ratio from 0.46 to 0.20. New production was predominantly associated with particles over 5 μm, although a subsurface (35m) peak in 15NO 3 uptake may have been due to bacterial uptake. We suggest that light was the single-most dominant factor regulating nitrate uptake during this time. However the relationship between new production and light was non-linear in that the light efficiency of nitrate uptake varied significantly between stations in addition to variations in available light. © 1992.
JournalDeep-Sea Research Part II
Date1993
Volume40
Issue1-2
Start page441
End page457
ISSN09670645
Subjectsenvironmental factors, new production, nitrate consumption, surface waters, Atlantic, Iceland Basin
NoteCited By (since 1996):21, CODEN: DSROE

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