NDLI: Phytoplankton distribution and nitrogen dynamics in the Southwest Indian subtropical gyre and Southern Ocean Waters

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Phytoplankton distribution and nitrogen dynamics in the Southwest Indian subtropical gyre and Southern Ocean Waters

Content Provider	Scilit
Author	Thomalla, S. J. Waldron, H. N. Lucas, M. I. Read, J. F. Ansorge, I. J. Pakhomov, E.
Copyright Year	2010
Description	During the 1999 Marion Island Oceanographic Survey (MIOS 4) in late austral summer, a northbound and reciprocal southbound transect were taken along the Southwest Indian and Madagascar Ridge, between the Prince Edward Islands and 31° S. The sections crossed a number of major fronts and smaller mesoscale features and covered a wide productivity spectrum from subtropical to subantarctic waters. Associated with the physical survey were measurements of size fractionated chlorophyll, nutrients and nitrogen (NO3, NH4 and urea) uptake rates. Subtropical waters were characterised by low concentrations (81%) and very low f-ratios (0.15) still dominated, despite sufficient NO3 availability. The results from this study favour Si limitation, light-limited deep mixing and likely Fe deficiency as the dominant mechanisms controlling significant new production by micro-phytoplankton. Increased concentrations of micro-phytoplankton cells and and rates of new production did however occur at oceanic frontal regions (58.6% and 11.22%, respectively), and in the region of the Prince Edward archipelago (61.4% and 14.16%, respectively). Here water column stabilization and local Fe-enrichment are thought to stimulate phytoplankton growth rates, especially of diatoms. Open ocean regions such as these provide important areas for local but significant POC export and biological CO2 draw-down in an overall HNLC Southern Ocean.
Ending Page	127
Page Count	15
Starting Page	113
DOI	10.5194/osd-7-1347-2010
Alternate Webpage(s)	https://open.uct.ac.za/bitstream/11427/6451/1/thesis_sci_2001_thomalla_sj.pdf
Issue Number	1
Volume Number	7
Language	English
Publisher	Copernicus GmbH
Publisher Date	2010-07-23
Access Restriction	Open
Subject Keyword	Phytoplankton Cells Edward Islands Reciprocal Southbound Stimulate Phytoplankton
Content Type	Text
Resource Type	Article

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