Determination of total N2 fixation rates in the ocean taking into account both the particulate and filtrate fractions

Konno U.; Tsunogai U.; Komatsu D. D.; Daita S.; Nakagawa F.; Tsuda A.; Matsui T.; Eum Y.-J.; Suzuki K.

Title	en Determination of total N2 fixation rates in the ocean taking into account both the particulate and filtrate fractions
Creator	en Konno, U. en Tsunogai, U. NRID 1000050313367 en Komatsu, D. D. en Daita, S. en Nakagawa, F. en Tsuda, A. en Matsui, T. en Eum, Y.-J. en Suzuki, K.
Accessrights	open access
Subject	NDC 450
Description	Abstract en Using the 15N2 tracer method and high-sensitivity δ15N analytical systems, we determined N2 fixation rates for ocean samples by dividing them into particulate (>0.7 μm) and filtrate (<0.7 μm) fractions. While N2 fixation in the filtrate fraction had been ignored in previous studies, we found a significant N2 fixation rates in the filtrate fraction in our study. The areal N2 fixation rates in the western North Pacific Ocean estimated from the particulate fraction varied from <1 to 160 μmol N m-2 d?1, and those rates estimated from the filtrate fraction ranged from <0.5 to 54 μmol N m-2 d?1. Thus, N2 fixation in the filtrate fraction accounts for on average 50% (ranging from <10% to 84%) of the total N2 fixation rates. If these results are confirmed generally in the ocean, the new total N2 fixation flux, which includes fixation in the filtrate fraction, possibly doubles the original estimates; therefore, the revised influx may reduce the imbalance in the global oceanic fixed nitrogen budget.
Publisher	en Copernicus Publications
Date	Issued2010-08-12
Language	eng
Resource Type	journal article
Version Type	VoR
Identifier	HDL http://hdl.handle.net/2115/44833
Relation	isIdenticalTo DOI https://doi.org/10.5194/bg-7-2369-2010
Journal	PISSN 1726-4170 EISSN 1726-4189 en Biogeosciences Volume Number7 Issue Number8 Page Start2369 Page End2377
File	fulltext bg-7-2369-2010.pdf 1.36 MB (application/pdf) Issued2010-08-12
Oaidate	2023-07-26