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Ocean Science An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/osd-4-245-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
 
27 Feb 2007
Review status
This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.
15N enrichment in the surface Particulate Organic Nitrogen of the north-eastern Arabian Sea from the middle to the waning phase of the winter monsoon: possible causes
S. Kumar1,2 and R. Ramesh1 1Planetary and Geosciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad- 380 009, India
2Environmental Sciences Research Centre, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada
Abstract. A temporal increase of ~5‰ in the average nitrogen isotopic composition (δ15NPON) of surface particulate organic nitrogen was observed in the open north-eastern Arabian Sea during January to late February-early March 2003, despite the presence of T. erithraeum (up to ~11%), a diazotroph that fixes atmospheric N2, in the latter period. Hydrographic conditions and residence time of nitrate in the water column suggested that this increase could be a combined effect of denitrification in the subsurface layer and inefficient utilization of nitrate entrained in the water column during January.

Citation: Kumar, S. and Ramesh, R.: 15N enrichment in the surface Particulate Organic Nitrogen of the north-eastern Arabian Sea from the middle to the waning phase of the winter monsoon: possible causes, Ocean Sci. Discuss., https://doi.org/10.5194/osd-4-245-2007, in review, 2007.
S. Kumar and R. Ramesh
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC S74: 'comments', Maren Voss, 04 Apr 2007 Printer-friendly Version 
 
RC S86: 'review manuscript osd-2007-0003', Anonymous Referee #2, 10 Apr 2007 Printer-friendly Version 
 
RC S90: 'review of Kumar and Ramesh', Anonymous Referee #3, 10 Apr 2007 Printer-friendly Version 
 
RC S99: 'Review', Anonymous Referee #1, 11 Apr 2007 Printer-friendly Version 
S. Kumar and R. Ramesh
S. Kumar and R. Ramesh

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