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.

タイトル	en Determination of total N2 fixation rates in the ocean taking into account both the particulate and filtrate fractions
作成者	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.
アクセス権	open access
主題	NDC 450
内容注記	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.
出版者	en Copernicus Publications
日付	Issued2010-08-12
言語	eng
資源タイプ	journal article
出版タイプ	VoR
資源識別子	HDL http://hdl.handle.net/2115/44833
関連	isIdenticalTo DOI https://doi.org/10.5194/bg-7-2369-2010
収録誌情報	PISSN 1726-4170 EISSN 1726-4189 en Biogeosciences 巻7 号8 開始ページ2369 終了ページ2377
ファイル	fulltext bg-7-2369-2010.pdf 1.36 MB (application/pdf) Issued2010-08-12
コンテンツ更新日時	2023-07-26