Vertical variations in the bio-optical properties of seawater in the northern South China Sea during summer 2008
Vertical variations in the bio-optical properties of seawater in the northern South China Sea during summer 2008
复制标题
2008年夏季南海北部海水生物光学特性的垂直变化
DOI：
10.1007/s13131-020-1535-y
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发表时间：
2020-04
影响因子：
1.4
通讯作者：
Wenxi Cao
中科院分区：
文献类型：
--
作者：
Guifen Wang;Wen Zhou;Zhantang Xu;Wenlong Xu;Yuezhong Yang;Wenxi Cao
利用吸收/衰减分光光度计研究了2008年夏季南海北部海水生物光学特性的垂直变化，包括固有光学特性（IOPs）和叶绿素a浓度（Chl）。建立了基于长波吸收线高度估算Chl分布的经验模型，相对均方根误差为37.03%。生物光学性质表现出较大的水平和垂直空间变异性。受沿岸上升流和珠江流量的影响，内陆架表层水体的IOPs和Chl均表现出较高的值，且随距离增加而减小。表层下最大的IOPs和Chl分布在大陆架中部和外大陆架区域，该层下的衰减系数值明显较高，且向底部迅速增加。在公海，IOPs和Chl均表现出一致的变率，次表层最大值通常位于34 ~ 84 m。浮游植物是决定生物光学特性垂直变化的主要因素之一，其垂直动力学受到物理强迫和光衰减效应的双重影响。次表层最大层的深度与海洋温跃层的波动和光带深度密切相关，这也影响了上层海洋的总综合生物量。在大陆架底部水域观测到的典型高衰减系数值反映了颗粒物质在底部边界层上的输送。我们的研究结果揭示了NSCS中生物光学剖面的巨大空间差异，以响应复杂的海洋生态动力学。从海洋研究的角度来看，高分辨率的光学测量显然优于传统的瓶子采样。
Vertical variability in the bio-optical properties of seawater in the northern South China Sea(NSCS)including inherent optical properties(IOPs)and chlorophyll a concentration(Chl)were studied on the basis of in situ data collected in summer 2008 using an absorption/attenuation spectrophotometer. An empirical model was developed to estimate Chl profiles based on the absorption line height at long wavelengths,with a relative root mean square error of 37.03%. Bio-optical properties exhibited large horizontal and vertical spatial variability. As influenced by coastal upwelling and the Zhujiang River(Pearl River)discharge,both IOPs and Chl exhibited high values in the surface waters of the inner shelf,which tended to decrease with distance offshore. Subsurface maximum layers of IOPs and Chl were observed in the middle and outer shelf regions,along with significantly higher values of attenuation coefficients beneath this layer that rapidly increased towards the bottom. In the open ocean,both IOPs and Chl exhibited consistent variability,with the subsurface maximum layer typically located at 34-84 m. Phytoplankton were found to be one of the major components in determining the vertical variability of bio-optical properties,with their vertical dynamics influenced by both physical forcing and light attenuation effects. The depth of the subsurface maximum layer was found to be closely related to the fluctuation of the oceanic thermocline and the depth of the euphotic zone,which also affected the total integrated biomass of the upper ocean. Typically high values of attenuation coefficients observed in the bottom waters of the continental shelf reflected the transport of particulate matter over the bottom boundary layer. Our results reveal large spatial differences in bio-optical profiles in response to complex marine ecodynamics in the NSCS. From the perspective of marine research,high-resolution optical measurements are clearly advantageous over conventional bottle sampling.
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影响因子：
11.4
作者：
通讯作者：
--
影响因子：
3.6
作者：
Morel, A;Maritorena, S
通讯作者：
Maritorena, S
影响因子：
3.6
作者：
MOREL, A
通讯作者：
MOREL, A
影响因子：
2.8
作者：
T. Dickey
通讯作者：
T. Dickey
影响因子：
4.5
作者：
Kadija Oubelkheir;H. Claustre;A. Sciandra;M. Babin
通讯作者：
Kadija Oubelkheir;H. Claustre;A. Sciandra;M. Babin