Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Discussion papers
https://doi.org/10.5194/bg-2019-58
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-58
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 11 Mar 2019

Submitted as: research article | 11 Mar 2019

Review status
This discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The manuscript was not accepted for further review after discussion.

Seasonal Sinking rates of Transparent Exopolymer Particles (TEP) concentrations with associated Carbon flux in adjacent Bohai Seaand Yellow Sea

M. Shahanul Islam1,2,3, Jun Sun2,3, Xiaoqian Li2,3, and Xiaoyun Leng2,3 M. Shahanul Islam et al.
  • 1College of Food Engineering and Biotechnology, Tianjin University of Science and Technology University, Tianjin 300457, China
  • 2Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin University of Science and Technology, Tianjin 300457, China
  • 3Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin 300457, China

Abstract. To study the seasonal transparent exopolymer particles (TEP) distributions, sedimentation and its impacts on carbon cycle in north Chinese seas, a total of total 56 stations TEP samples and its sinking rate measurements by SETCOL method via water sampling cruise during autumn (2014), summer (2015) and winter (2015) in the Bohai Sea (BS), North Yellow Sea (NYS) and South Yellow Sea (SYS) at three different depths were carried out. Temperature, phytoplankton, chlorophyll-a (Chl-a) and salinity with five nutrients, phosphate (DIP), silicate (DSi), dissolved inorganic nitrate (DIN) (including nitrite, nitrate and ammonium) were also collected and measured for correlation analysis to visualize the seasonal effects on TEP concentrations (CTEP) and its sinking. Average of total CTEP (2.13 μg Xeq L−1) was higher in NYS (3.32 μg Xeq L−1) costal currents with highest average CTEP during winter (6.17 μg Xeq L−1) specially in NYS (7.00 μg Xeq L−1) through coastal current mixing zone. Average of total sinking rates (1.03 mD−1) was higher in SYS (1.09 mD−1) through mid-water layer than other seas, especially in autumn (1.13 mD−1) with higher seasonal average sinking rates at summer (1.04 mD−1). Carbon associated with TEP (TEP-C) was averagely distributed (1.47 μg C L−1) at subsurface layer of study areas. Seasonal highest distribution of TEP-C was 4.44 μg C L−1 during winter, mostly in NYS. Dominant phytoplankton species Paralia sulcata, Thalassisira excentrica and Rhizosolenia styliformis maintained average correspondences with CTEP which may indicate the influences of them on TEP concentration. Congregating oceanic stations in other groups, coastal stations were averagely clustered together in multivariate analysis. Average canonical correspondence analysis showed close relation of CTEP with Chl-a during autumn and with nutrient during winter.

M. Shahanul Islam et al.
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
M. Shahanul Islam et al.
M. Shahanul Islam et al.
Viewed  
Total article views: 350 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
278 68 4 350 1 4
  • HTML: 278
  • PDF: 68
  • XML: 4
  • Total: 350
  • BibTeX: 1
  • EndNote: 4
Views and downloads (calculated since 11 Mar 2019)
Cumulative views and downloads (calculated since 11 Mar 2019)
Viewed (geographical distribution)  
Total article views: 223 (including HTML, PDF, and XML) Thereof 222 with geography defined and 1 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 20 Oct 2019
Publications Copernicus
Download
Short summary
This manuscript expressed several seasonal datasets on TEP and its sinking rates through descriptive comparison with previous work. This paper will provide a clear scenario for further research to the interested scientist about oceanic carbon pool associated with TEP. The manuscript were designed after discussing of TEP assemblage and its sinking variations through different depths with seasonal (autumn, summer & winter) fluctuations in two dynamic seas of China (Bohai Sea & Yellow Sea).
This manuscript expressed several seasonal datasets on TEP and its sinking rates through...
Citation