Spatial variability of surface-sediment porewater pH and related water-column characteristics in deep waters of the northern South China Sea
Spatial variability of surface-sediment porewater pH and related water-column characteristics in deep waters of the northern South China Sea
复制标题
南海北部深水区表层沉积物孔隙水pH值空间变异及相关水柱特征
DOI：
10.1016/j.pocean.2016.10.006
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发表时间：
2016-12
影响因子：
4.1
通讯作者：
Legendre Louis
中科院分区：
文献类型：
--
作者：
Shao Changgao;Sui Yi;Tang Danling;Legendre Louis
本文分析了南海中国北部1192个沉积物柱样的表层-沉积物孔隙水(即水-沉积物界面下2-3 cm)的pH、CaCO_3和有机碳(OC)的浓度，深度为137m-3702m，这在文献中首次分析了大型洋盆上深水表层-沉积物pH的大尺度空间变异性。数据显示，pH值在空间上有很大的变化。海南岛南部的pH值最低(<；7.3)，该地区受夏季上升流和珠江、红河淡水径流的影响。另有两个地区出现了中等低pH值(一般为7.3-7.5)：海底峡谷，部分沉积物来自珠江，对应于上一次冰期的古三角洲前缘；台湾岛西南部，那里的水域受到黑潮入侵流(KIC)北支和台湾河径流的影响。表层沉积物的pH值最高(⩾为7.5，最高可达8.3)位于第四个区域，该区域对应于KIC的西支，那里的沉积物被底流强烈侵蚀。表层沉积物孔隙水的pH值与水深、底层水温和CaCO3浓度呈显著的线性相关(p<；在整个采样区为0.05)。这项研究表明，表层沉积物孔隙水的pH值对上覆水柱的特征很敏感，并表明随着表层海洋温度和pH值的变化逐渐达到更深的水域，它将对全球变暖做出反应。
This study analyzes the pH of surface-sediment porewater (i.e. 2–3 cm below the water-sediment interface), and concentrations of CaCO3and organic carbon (OC) in 1192 sediment cores from the northern South China Sea, in water depths ranging from 137 to 3702 m. This is the first study in the literature to analyze the large-scale spatial variability of deep-water surface-sediment pH over a large ocean basin. The data showed strong spatial variations in pH. The lowest pH values (<7.3) were observed south of Hainan Island, an area that is affected by summer upwelling and freshwater runoff from the Pearl and Red Rivers. Moderately low pH values (generally 7.3–7.5) occurred in two other areas: a submarine canyon, where sediments originated partly from the Pearl River and correspond to a paleo-delta front during the last glacial period; and southwest of Taiwan Island, where waters are affected by the northern branch of the Kuroshio intrusion current (KIC) and runoff from Taiwan rivers. The surface sediments with the highest pH (⩾7.5, and up to 8.3) were located in a fourth area, which corresponded to the western branch of the KIC where sediments have been intensively eroded by bottom currents. The pH of surface-sediment porewater was significantly linearly related to water depth, bottom-water temperature, and CaCO3concentration (p< 0.05 for the whole sampling area). This study shows that the pH of surface-sediment porewater can be sensitive to characteristics of the overlying water column, and suggests that it will respond to global warming as changes in surface-ocean temperature and pH progressively reach deeper waters.
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DOI：
10.1098/rsta.1990.0054
发表时间：
1990-06-19
影响因子：
5
作者：
EMERSON, SR;ARCHER, D
通讯作者：
ARCHER, D
影响因子：
11.3
作者：
R. Blake;E. Shute;M. M. Greenwood-M.;G. H. Spencer;W. Ingledew
通讯作者：
R. Blake;E. Shute;M. M. Greenwood-M.;G. H. Spencer;W. Ingledew
影响因子：
5.2
作者：
B. Hales;S. Emerson
通讯作者：
B. Hales;S. Emerson
影响因子：
4.5
作者：
S. Ben-Yaakov
通讯作者：
S. Ben-Yaakov
影响因子：
3.6
作者：
Gan, Jianping;Li, H.;Haidvogel, D. B.
通讯作者：
Haidvogel, D. B.