Spatial heterogeneity in photosynthesis-irradiance parameters of phytoplankton across a cyclonic eddy in the Antarctic Divergence zone along 140°E
Article first published online: 26 SEP 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 18, September 2007
How to Cite
2007), Spatial heterogeneity in photosynthesis-irradiance parameters of phytoplankton across a cyclonic eddy in the Antarctic Divergence zone along 140°E, Geophys. Res. Lett., 34, L18605, doi:10.1029/2007GL030736., , , and (
- Issue published online: 26 SEP 2007
- Article first published online: 26 SEP 2007
- Manuscript Accepted: 13 AUG 2007
- Manuscript Revised: 11 JUL 2007
- Manuscript Received: 30 MAY 2007
- P-E parameters;
- cyclonic eddy;
- Southern Ocean
 The latitudinal variation in the photosynthesis-irradiance (P-E) relationship of phytoplankton was investigated across a cyclonic eddy in the Antarctic Divergence zone along the 140°E longitude. Both the maximum photosynthetic rate (P*max) and maximum light utilization coefficient (α*) were lower at stations within the eddy as compared with those in the continental shelf-slope area and the offshore area. The low-density water mass of the eddy prevented the upward and horizontal supply of macronutrients and micronutrients, which likely resulted in a reduction of P*max and α*. In contrast, both P*max and α* were large and variable in the slope area, probably owing to a local stability resulting from the less-saline surface water. The present study indicates the possibility that longitudinal variations in the latitudinal pattern of meanders, eddies, seasonal sea-ice extent, and topographical conditions significantly influence the mesoscale variations in the P-E parameters and primary production in the Southern Ocean.