Seasonal dynamics and export of biogenic silica in the upper water column of a large marginal sea, the northern South China Sea
Seasonal dynamics and export of biogenic silica in the upper water column of a large marginal sea, the northern South China Sea
复制标题
南海北部大型边缘海上层水体生物硅的季节动态和输出
DOI：
10.1016/j.pocean.2020.102421
复制
发表时间：
2020-08
影响因子：
4.1
通讯作者：
Minhan Dai
中科院分区：
文献类型：
--
作者：
Zhimian Cao;Danna Wang;Zhouling Zhang;Kuanbo Zhou;Xin Liu;Lei Wang;Bangqin Huang;Pinghe Cai;Minhan Dai
生物硅(BSI)主要来源于海洋硅藻，是海洋硅循环的主要组成部分。它通过光合作用和世界海洋许多地区，特别是海洋边缘的所谓“压舱物”效应，通过硅酸盐泵与全球碳循环联系在一起。本文基于从太平洋最大的边缘海--南海中国海北部的上层水柱采集的大量数据，研究了南海表层沉积物的分布和输出。总体而言，从陆架到盆地，BSI浓度在所有季节都是下降的。夏季在近岸表层水域观测到的最高值与遥远的河流羽流中的硅藻水华有关。在季节上，BSI浓度在秋季和冬季总体上高于春季和夏季，这是由于旱季营养物质垂直供应增加支持了硅藻生产力的提高。褐藻黄质的空间和季节变化模式较好地反映了褐藻黄质的空间和季节变化规律，说明了硅藻在控制NSCS上层生物多样性动态中的主导作用。由Th-234/U-238不平衡确定的BSI出口通量主要受BSI现存量的调节，平均而言，陆架上的BSI出口通量高于盆地，枯水期高于丰水期。此外，BSI的高出口有助于促进货架上颗粒有机碳(POC)的出口，而不同区域之间的POC常备存量具有可比性。因此，硅酸盐泵由上层水柱中的硅藻驱动，在富营养化条件下更有效地发挥作用。与以往用泥沙捕集器测量的颗粒沉降通量的比较表明，BSI和POC的相关性随着水深的增加而增加，并变得更加显著。这为BSI在将POC转移到NSCS盆地深水中所起的压载作用提供了直接证据，尽管在这种贫营养环境中，硅藻对真光层POC积累的贡献很小。
Biogenic silica (BSi), primarily derived from marine diatoms, is a major component of the oceanic silicon cycle. It links with the global carbon cycle through the silicate pump via photosynthesis and the so-called “ballast” effect in many areas of the world’s oceans, particularly in ocean margins. Here we examined the distribution and export of BSi based on a large data set collected from the upper water column of the northern South China Sea (NSCS), the largest marginal sea of the Pacific Ocean. Generally, BSi concentrations decreased from the shelf to the basin in all seasons. The highest value was observed in nearshore surface waters in summer, associated with a diatom bloom in the far-reaches of river plumes. Seasonally, BSi concentrations were overall higher in autumn and winter than in spring and summer, due to elevated diatom productivity supported by an increased vertical supply of nutrients in dry seasons. Patterns of BSi spatial and seasonal variability were well represented by those of the pigment fucoxanthin, demonstrating the dominant role of diatoms in controlling BSi dynamics in the upper NSCS. Mainly regulated by BSi standing stock, BSi export flux from the euphotic zone, determined using thorium-234/uranium-238 disequilibrium, was on average higher on the shelf than in the basin, and in the dry than wet season. Furthermore, the high BSi export helped to promote the export of particulate organic carbon (POC) on the shelf, while the POC standing stock was comparable between different regions of the NSCS. Thus, the silicate pump, driven by diatoms in the upper water column, functioned more efficiently under eutrophic conditions. A comparison with prior measurements of particle sinking fluxes using sediment traps showed that the correlation of BSi and POC increased and became more significant with increasing water depth. This provides direct evidence of the pronounced ballast effect of BSi in transferring POC into deep waters of the NSCS basin, even though the contribution of diatoms to POC accumulation in the euphotic zone was minor in this oligotrophic environment.
登录
查看更多内容
影响因子：
5.2
作者：
R. Sanders;P. Morris;A. Poulton;M. Stinchcombe;A. Charalampopoulou;M. Lucas;S. Thomalla
通讯作者：
R. Sanders;P. Morris;A. Poulton;M. Stinchcombe;A. Charalampopoulou;M. Lucas;S. Thomalla
南海溶解有机碳及其与西太平洋的交换
DOI：
10.1016/j.dsr2.2015.06.013
发表时间：
2015-12
影响因子：
3
作者：
Wu Kai;Dai Minhan;Chen Junhui;Meng Feifei;Li Xiaolin;Liu Zhiyu;Du Chuanjun;Gan Jianping
通讯作者：
Gan Jianping
南海北部光合参数与浮游植物群落结构的关系
影响因子：
3.6
作者：
Yuyuan Xie;Bangqin Huang;Lizhen Lin;Edward A. Laws;Lei Wang;Shaoling Shang;Tinglu Zhang;Minhan Dai
通讯作者：
Minhan Dai
2003/2004年冬季南海北部暖涡处的浮游植物群落
DOI：
10.1016/j.dsr2.2010.04.005
发表时间：
2010-10-01
影响因子：
3
作者：
Huang, Bangqin;Hu, Jun;Wang, Dongxiao
通讯作者：
Wang, Dongxiao
影响因子：
4.1
作者：
Wupeng Xiao;Lei Wang;E. Laws;Yuyuan Xie;Jixin Chen;Xin Liu;Bingzhang Chen;Bangqin Huang
通讯作者：
Wupeng Xiao;Lei Wang;E. Laws;Yuyuan Xie;Jixin Chen;Xin Liu;Bingzhang Chen;Bangqin Huang