Journal cover Journal topic
Ocean Science An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 2.864
IF2.864
IF 5-year value: 3.337
IF 5-year
3.337
CiteScore value: 4.5
CiteScore
4.5
SNIP value: 1.259
SNIP1.259
IPP value: 3.07
IPP3.07
SJR value: 1.326
SJR1.326
Scimago H <br class='widget-line-break'>index value: 52
Scimago H
index
52
h5-index value: 30
h5-index30
Preprints
https://doi.org/10.5194/os-2020-69
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2020-69
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  21 Jul 2020

21 Jul 2020

Review status
This preprint is currently under review for the journal OS.

High-resolution distributions of O2/Ar on the northern slope of the South China Sea and estimates of net community production

Chuan Qin1,2, Guiling Zhang1,2, Wenjing Zheng1, Yu Han1,3, and Sumei Liu1,2 Chuan Qin et al.
  • 1Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education/Institute for Advanced Ocean Study, Ocean University of China, 238 Songling Road, 266100 Qingdao, P. R. China
  • 2Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, P. R. China
  • 3Hainan Tropical Ocean University, Sanya 572022, P. R. China

Abstract. Net community production (NCP) is a proxy of carbon export from the surface ocean and can be estimated based on O2/Ar. In order to obtain the high-resolution distribution of NCP and improve our understanding of its regulating factors in the slope region of the Northern South China Sea (SCS), we conducted continuous measurements of dissolved O2, Ar, and CO2 by membrane inlet mass spectrometry during cruises in October 2014 and June 2015. An overall autotrophic condition was observed in the study region in both cruises with an average ∆(O2/Ar) of 1.1 % ± 0.9 % in October 2014 and 2.7 % ± 2.8 % in June 2015. NCP was on average 11.5 ± 8.7 mmol C m−2 d−1 in October 2014 and 11.6 ± 12.7 mmol C m−2 d−1 in June 2015. Correlations between dissolved inorganic nitrogen (DIN), ∆(O2/Ar), and NCP were observed in both cruises, indicating that NCP is subject to the nitrogen limitation in the study region. In June 2015, we observed a rapid response of the ecosystem to the episodic nutrient supply induced by eddies. Eddy-entrained shelf water injection, which supplied large amounts of terrigenous nitrogen to the study region, resulted in high productivity along a transect. In addition, upwelling brought large uncertainties to the estimation of NCP at the core region of the cold eddy (cyclone) in June 2015. The correlation between the volumetric NCP (NCPvol) and the mixed layer depth (MLD) indicated that light availability may have also been a factor in influencing NCP in the SCS.

Chuan Qin et al.

Interactive discussion

Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Login for Authors/Topic Editors] [Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Chuan Qin et al.

Chuan Qin et al.

Viewed

Total article views: 152 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
94 42 16 152 10 16 17
  • HTML: 94
  • PDF: 42
  • XML: 16
  • Total: 152
  • Supplement: 10
  • BibTeX: 16
  • EndNote: 17
Views and downloads (calculated since 21 Jul 2020)
Cumulative views and downloads (calculated since 21 Jul 2020)

Viewed (geographical distribution)

Total article views: 120 (including HTML, PDF, and XML) Thereof 120 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 19 Oct 2020
Publications Copernicus
Download
Short summary
We conducted an underway measurement of O2/Ar using membrane inlet mass spectrometry and estimated net community production (NCP) in the South China Sea (SCS) in both summer and autumn. We found that nutrient, especially nitrogen, is the dominant factor affecting primary production in the SCS. In the summer survey, we observed the rapid response of the ecosystem to the episodic nutrient supply induced by eddies. This is the first report on NCP estimation based on O2/Ar data in the SCS.
We conducted an underway measurement of O2/Ar using membrane inlet mass spectrometry and...
Citation