Atmospheric Nitrogen Deposition Controls Interannual Variability of Net Primary Production in the Bohai Sea

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY Journal of Geophysical Research-Oceans Pub Date : 2024-10-30 DOI:10.1029/2024JC021562
Yuan Yao, Guirui Yu, Lang Han, Zhi Chen, Tiejun Wang, Zhifeng Yan, Jilong Wang, Mingyu Sun
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Abstract

Increasing human activities and climate change have resulted in significant changes in net primary production (NPP) of the marginal sea in the past several decades. The Bohai Sea (BHS) is a shallow semi-enclosed marginal sea of North China, the knowledge of the relative impacts of human activities and climate change on the NPP in the BHS remains limited. This study primarily aimed to elucidate the interannual variability of NPP and its influencing factors in the BHS during the 2002–2021 period by synthesizing four widely-used global NPP models, namely the vertically generalized production model (VGPM), the Eppley-VGPM, the size-fractioned phytoplankton pigment absorption-based model (SABPM), and the carbon, absorption, and fluorescence euphotic-resolving model (CAFE). The multi-model average NPP showed significant interannual variation, with an increasing trend from 2002 to 2012 and a decreasing trend from 2012 to 2021. The concentration of DIN in the BHS was primarily affected by atmospheric nitrogen deposition. The structural equation model demonstrated that chlorophyll-a (Chl-a) concentration, influenced by DIN concentration, had an important effect on NPP. In brief, atmospheric nitrogen deposition impacted the DIN concentration and thus controlled the (Chl-a) concentration and NPP change in the BHS. Furthermore, atmospheric nitrogen deposition in the BHS have potential ecological impacts on the red tide features. These findings hold valuable implications for future marine resource planning and marine ecological management in the BHS.

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大气氮沉降控制渤海净初级生产力的年际变化
过去几十年来,人类活动的增加和气候变化导致边缘海的净初级生产力(NPP)发生了显著变化。渤海(BHS)是华北的一个浅海半封闭边缘海,人类活动和气候变化对渤海净初级生产力的相对影响的认识仍然有限。本研究的主要目的是综合四种广泛使用的全球 NPP 模型,即垂直广义生产模型(VGPM)、Eppley-VGPM、基于尺寸分馏的浮游植物色素吸收模型(SABPM)和碳、吸收和荧光极光解析模型(CAFE),阐明 2002-2021 年期间渤海海域 NPP 的年际变化及其影响因素。多模型平均 NPP 年际变化显著,2002-2012 年呈上升趋势,2012-2021 年呈下降趋势。BHS 中的 DIN 浓度主要受大气氮沉降的影响。结构方程模型表明,叶绿素-a(Chl-a)浓度受 DIN 浓度影响,对 NPP 有重要影响。简而言之,大气氮沉降影响了 DIN 浓度,从而控制了 BHS 的(Chl-a)浓度和 NPP 变化。此外,BHS 中的大气氮沉积对赤潮特征具有潜在的生态影响。这些发现对 BHS 未来的海洋资源规划和海洋生态管理具有重要意义。
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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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