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Journal of Tropical Oceanography >

2016 , Vol. 35 >Issue 1: 102 - 111

DOI: https://doi.org/10.11978/2015001

Marine Biology

Modeling the impact of N2-fixation on the ecosystem dynamics in the upstream Kuroshio

  • WANG Yanjun ,
  • DONG Yuan ,
  • CHEN Yinchao ,
  • ZHOU Weiwen ,
  • LI Qian
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  • 1. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
    2. HuiZhou University, Huizhou 51600, China

Received date: 2014-12-30

  Online published: 2016-02-02

Supported by

The Strategic Priority Research Program of the Chinese Academy of Science (XDA11020201-4)

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Abstract

An NPZD(nutrient, phytoplankton, zooplankton, detritus) model with incorporation of a diazotroph function group was used to simulate the temporal change of ecosystem in the upstream Kuroshio Current. The modeled nutrients, chlorophyll-a, and productivity showed good agreements with the observations. The impacts of N2-fixation on nutrient concentrations, plankton biomass, and detritus were assessed by comparisons of the modeled simulations with and without diazotrophs. Our results suggested that diazotrophs were most abundant in summer and fall when other phytoplankton were nitrogen limited. The mean growth of phytoplankton could increase by 64% with the input of new nitrogen from N2-fixation, leading to 30% increase of primary production, regenerated production, and new production, respectively. In summer, N2-fixation supported 50%~80% of the new production in the upper 50 m, but only 10%~50% in the depths of 50~200 m. This finding suggested that N2-fixation was an important source of new nitrogen for phytoplankton production above 50 m in the upstream Kuroshio, but new production below 50 m was largely contributed by the vertical nutrient fluxes from below.

Key words： NPZD model; Kuroshio; N2-fixation; ecosystem; new production

Cite this article

WANG Yanjun , DONG Yuan , CHEN Yinchao , ZHOU Weiwen , LI Qian . Modeling the impact of N2-fixation on the ecosystem dynamics in the upstream Kuroshio[J]. Journal of Tropical Oceanography, 2016 , 35(1) : 102 -111 . DOI: 10.11978/2015001

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