| Guo Shujin,Sun Jun. 2020. Concentrations and sinking rates of transparent exopolymer particles (TEPs) in a coastal sea: the Changjiang River (Yangtze River) Estuary. Acta Oceanologica Sinica, 39(10):58－69 |
| Concentrations and sinking rates of transparent exopolymer particles (TEPs) in a coastal sea: the Changjiang River (Yangtze River) Estuary |
| 长江口邻近海域透明胞外聚合颗粒物浓度和沉降速率研究 |
| Received:October 16, 2019 |
| DOI：10.1007/s13131-020-1660-7 |
| Key words:transparent exopolymer particles sinking rates Changjiang River (Yangtze River) Estuary coastal sea |
| 中文关键词: 透明胞外聚合颗粒物 沉降速率 长江口 近海 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | Guo Shujin | Jiaozhou Bay Marine Ecosystem Research Station, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China | | | Sun Jun | College of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan 430074, China | phytoplankton@163.com |
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| Abstract: |
| Transparent exopolymer particles (TEPs) are ubiquitous throughout the oceans, and their sedimentation is considered an efficient biological carbon sink pathway. To investigate the role of coastal TEPs in sinking carbon from the upper layer, samples were collected in the spring and summer of 2011 in the Changjiang River (Yangtze River) Estuary, a typical coastal water. The concentrations and sinking rates of TEPs were measured, and potential sedimentation flux of TEPs was estimated. TEPs concentrations ranged from 40.00 μg/L to 1 040.00 μg/L (mean=(209.70±240.93) μg/L) in spring and 56.67 μg/L to 1 423.33 μg/L (mean=(433.33±393.02) μg/L) in summer, and they were higher at bloom stations than at non-bloom stations during both cruises. A significant positive correlation between TEPs concentration and chlorophyll a (Chl a) concentration was detected, suggesting that phytoplankton was the primary source of TEPs in this area. TEPs sinking rates ranged from 0.08 m/d to 0.57 m/d with a mean of (0.28±0.14) m/d in spring and 0.10 m/d to 1.08 m/d with a mean of (0.34±0.31) m/d in summer. The potential sedimentation flux of TEP-C ranged from 4.95 mg/(m2·d) to 29.40 mg/(m2·d) with a mean of (14.66±8.83) mg/(m2·d) in spring and 6.80 mg/(m2·d) to 30.45 mg/(m2·d) with a mean of (15.71±8.73) mg/(m2·d) in summer, which was ~17.81% to 138.27% (mean=65.15%±31.75%) of sedimentation flux of phytoplankton cells in the study area. Due to the increase of TEPs concentrations and their sinking rates, sedimentation fluxes of TEPs at the bloom station were obviously higher than at the non-bloom station during both cruises. This study indicates that TEPs serve as a carbon sink in the Changjiang River Estuary, especially during bloom events, and their sedimentation should be taken into account when we study the carbon sedimentation in the coastal sea. |
| 中文摘要: |
| 透明胞外聚合颗粒物（Transparent exopolymer particles，TEPs）在海洋中分布广泛，其沉降被认为是海洋中生物碳沉降的途径之一。本研究于2011年春季和夏季调查了长江口邻近海域TEPs的浓度和沉降速率，并且估算了其碳沉降通量。研究发现，TEPs浓度春季介于40.00~1040.00 μg Xeq L-1，平均值为209.70±240.93 μg Xeq L-1；夏季介于56.67~1423.33 μg Xeq L-1，平均值为433.33±393.02 μg Xeq L-1。两个季节，TEPs在水华站位的浓度明显高于非水华站位。相关性分析表明，TEPs与水体叶绿素a浓度呈显著正相关性，表明在调查区浮游植物是TEPs的主要生产者。TEPs沉降速率在春季介于0.08~0.57 m d-1，平均值为0.28±0.14 m d-1；夏季介于0.10~1.08 m d-1，平均值为0.34±0.31 m d-1。经估算，TEPs碳沉降通量春季介于4.95~29.40 mg C m-2 d-1，平均值为14.66±8.83 mg C m-2 d-1；夏季介于6.80~30.45 mg C m-2 d-1，平均值为15.71±8.73 mg C m-2 d-1。TEPs的碳沉降通量可以占到浮游植物碳沉降通量的17.81%~138.27%。水华站位TEPs的碳沉降通量明显高于非水华站位，这是由于水华站位较高的TEPs浓度及沉降速率所致。本研究表明，TEPs的沉降在长江口邻近海域是碳沉降的有效途径，在相应的碳沉降相关研究中应该被考虑进来。 |
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