Physical-biological coupling of N-2 fixation in the northwestern South China Sea coastal upwelling during summer

Zhang, Run
Chen, Min
Yang, Qing
Lin, Yuanshao
Mao, Huabin
Qiu, Yusheng
Tong, Jinlu
Lv, E.
Yang, Zhi
Yang, Weifeng
Cao, Jianping

Publication date

January 2015

Abstract

Here, we present the first combined results of N-2 fixation rates (N-15(2) assay), dissolved iron (dFe,<0.2 m), and primary production (PP) (C-14 assay) in the northwestern South China Sea (NWSCS) coastal upwelling region during summer. Surface N-2 fixation rate ranged between 0.1 nmol N L-1 d(-1) and 5.6 nmol N L-1 d(-1) (average 1.0 nmol N L-1 d(-1), n=50) under nonbloom conditions. At a Trichodesmium bloom station, N-2 fixation rate was approximate to 3 orders of magnitude higher. Depth-integrated N-2 fixation rate ranged between 7.5 mol N m(-2) d(-1)and 163.1 mol N m(-2) d(-1) (average 46.4 mol N m(-2) d(-1)). Our results indicate that N-2 fixation is unlikely limited by Fe availability in the NWSCS continental waters, instead, the coas...

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Physical-biological coupling of N-2 fixation in the northwestern South China Sea coastal upwelling during summer

Abstract

Extracted data

Physical-biological coupling of N-2 fixation in the northwestern South China Sea coastal upwelling during summer

Abstract

Extracted data

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