Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 3.174 IF 3.174
  • IF 5-year value: 3.841 IF 5-year 3.841
  • CiteScore value: 3.48 CiteScore 3.48
  • SNIP value: 1.078 SNIP 1.078
  • SJR value: 1.981 SJR 1.981
  • IPP value: 3.38 IPP 3.38
  • h5-index value: 42 h5-index 42
  • Scimago H index value: 58 Scimago H index 58
Discussion papers
https://doi.org/10.5194/cp-2015-167
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/cp-2015-167
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 14 Mar 2016

Research article | 14 Mar 2016

Review status
This discussion paper is a preprint. It has been under review for the journal Climate of the Past (CP). A final paper in CP is not foreseen.

Circulation and oxygenation of the glacial South China Sea

Shuh-Ji Kao1, Tzu-Ling Chiang2, Da-Wei Li1, Yi-Chia Hsin3, Li-Wei Zheng1, Jin-Yu Terence Yang1, Shih-Chieh Hsu3, Chau-Ron Wu2, and Minhan Dai1 Shuh-Ji Kao et al.
  • 1State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
  • 2Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan
  • 3Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan

Abstract. Degree of oxygenation in intermediate water modulates the downward transferring efficiency of primary productivity (PP) from surface water to deep water for carbon sequestration, consequently, the storage of nutrients versus the delivery and sedimentary burial fluxes of organic matter and associated biomarkers. To better decipher the PP history of the South China Sea (SCS), appreciation about the glacial-interglacial variation of the Luzon Strait (LS) throughflow, which determines the mean residence time and oxygenation of water mass in the SCS interior, is required. Based on a well-established physical model, we conducted a 3-D modeling exercise to quantify the effects of sea level drop and monsoon wind intensity on glacial circulation pattern, thus, to evaluate effects of productivity and circulation-induced oxygenation on the burial of organic matter. Under modern climatology wind conditions, a 135 m sea level drop results in a greater basin closeness and a ~ 23 % of reduction in the LS intermediate westward throughflow, consequently, an increase in the mean water residence time (from 19 to 23 year). However, when the wind intensity was doubled during glacial low, the throughflow restored largely to reach a similar residence time (18.4 years) as today regardless its closeness. Comparing with present day SCS, surface circulation pattern in glacial model exhibits (1) stronger upwellings at the west off Luzon Island and the east off Vietnam, and (2) an intensified southwestward jet current along the western boundary of the SCS basin. Superimposed hypothetically by stronger monsoon wind, the glacial SCS conditions facilitate greater primary productivity. Manganese, a redox sensitive indicator, in IMAGES core MD972142 at southeastern SCS revealed a relatively reducing environment in glacial periods. Considering the similarity in the mean water residence time between modern and glacial cases, the reducing environment of the glacial southeastern SCS was thus ascribed to a productivity-induced rather than ventilation-induced consequence.

Shuh-Ji Kao 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
Shuh-Ji Kao et al.
Shuh-Ji Kao et al.
Viewed  
Total article views: 841 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
416 381 44 841 8 45
  • HTML: 416
  • PDF: 381
  • XML: 44
  • Total: 841
  • BibTeX: 8
  • EndNote: 45
Views and downloads (calculated since 14 Mar 2016)
Cumulative views and downloads (calculated since 14 Mar 2016)
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 18 Jan 2019
Publications Copernicus
Download
Short summary
A 3-D model was run for the South China Sea to explore the effects of sea level drop and monsoon wind intensity on glacial patterns of circulation and ventilation. Winter northeasterly monsoon wind intensity governs the volume transport of Kuroshio intrusion through the Luzon Strait, subsequently, the water exchange rate and the mean residence time of water body of the SCS.
A 3-D model was run for the South China Sea to explore the effects of sea level drop and monsoon...
Citation
Share