Net community production in the South China Sea Basin estimated from in situ O2 measurements on an Argo profiling float

Yibin Huang; Bo Yang; Bingzhang Chen; Guoqiang Qiu; Haili Wang; Bangqin Huang

doi:10.1016/j.dsr.2017.11.002

Net community production in the South China Sea Basin estimated from in situ O₂ measurements on an Argo profiling float

Yibin Huang, Bo Yang^*, Bingzhang Chen, Guoqiang Qiu, Haili Wang, Bangqin Huang

^*Corresponding author for this work

Mathematics And Statistics

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

For the first time, the net community production (NCP) was estimated over a complete annual cycle in the basin of the South China Sea (SCS) using in situ oxygen measurements from an Argo profiling float and an oxygen mass balance model. The annual NCP from July 2014 to July 2015 was estimated to be 2.7 mol C m⁻² yr⁻¹ (calculated to the deepest winter mixed layer depth of 56 m), with the uncertainties ranging from 0.9 ~ 2.2 mol C m⁻² yr⁻¹. NCP estimates followed a monsoonal pattern with higher values in the cold season (November to April) when northeast monsoon prevailed and low values in the warm season (June to September) when this area was dominated by the southwest monsoon. Most of the net heterotrophic events occurred in the warm season. The magnitude and seasonal pattern derived from our results agree with previous export production studies based on discrete measurements. Comparison with satellite-derived NCP revealed that the results derived with NPP from Carbon-based Production Model (CbPM) were closer to the Argo measurements than the results derived with NPP from Vertically Generalized Production Model (VGPM) in magnitude; while the VGPM-based approach did a better job in reproducing the seasonal cycle of NCP in this area. This novel approach provides the possibilities to study the carbon cycle in the SCS with a much higher temporal and spatial resolution, as well as more insights for metabolic state in the oligotrophic subtropical gyres.

Original language	English
Pages (from-to)	54-61
Number of pages	8
Journal	Deep-Sea Research Part I: Oceanographic Research Papers
Volume	131
Early online date	21 Nov 2017
DOIs	https://doi.org/10.1016/j.dsr.2017.11.002
Publication status	Published - 31 Jan 2018

Funding

This study was jointly supported by the m wind speed along the track of Argo was obtained from the advanced scatterometer (ASCAT) data product ( National Key Research and Development Program of China (No. 2016YFA0601201 ), the National Key Scientific Research Project of China ( 2015CB954002 ), the Natural Science Foundation of China (No. 41330961 , 41576100 ), and the Special Fund of the State Oceanic Administration of the People's Republic of China (No. 530-03-02-02-03 ). B. Chen also acknowledges support from CREST (P.I. SLS) funded by the Japan Science and Technology (JST) Agency and a Grants-in-Aid for Scientific Research (KAKENHI) (Grant Number JP16K21701 ) funded by Japan Society for the Promotion of Science (JSPS). The Argo data used were obtained from State Key Laboratory of Marine Environmental Science, Xiamen University ( http://odc.xmu.edu.cn/BioArgo/Default.aspx ). Monthly net primary production data were taken from the remote sensing products ( http://www.science.oregonstate.edu/ocean.productivity/index.php ). Daily averaged 10 http://apdrc.soest.hawaii.edu/las/v6/ ). We thank Dr. Yuyuan Xie for comments and suggestions on this manuscript. We also thank Dr. Minhan Dai for providing his unpublished data for calibration of oxygen sensor.

Keywords

Argo float
net community production
satellite-derived net community production
South China Sea Basin
temporal variation

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10.1016/j.dsr.2017.11.002

Cite this

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title = "Net community production in the South China Sea Basin estimated from in situ O2 measurements on an Argo profiling float",

abstract = "For the first time, the net community production (NCP) was estimated over a complete annual cycle in the basin of the South China Sea (SCS) using in situ oxygen measurements from an Argo profiling float and an oxygen mass balance model. The annual NCP from July 2014 to July 2015 was estimated to be 2.7 mol C m−2 yr−1 (calculated to the deepest winter mixed layer depth of 56 m), with the uncertainties ranging from 0.9 \textasciitilde{} 2.2 mol C m−2 yr−1. NCP estimates followed a monsoonal pattern with higher values in the cold season (November to April) when northeast monsoon prevailed and low values in the warm season (June to September) when this area was dominated by the southwest monsoon. Most of the net heterotrophic events occurred in the warm season. The magnitude and seasonal pattern derived from our results agree with previous export production studies based on discrete measurements. Comparison with satellite-derived NCP revealed that the results derived with NPP from Carbon-based Production Model (CbPM) were closer to the Argo measurements than the results derived with NPP from Vertically Generalized Production Model (VGPM) in magnitude; while the VGPM-based approach did a better job in reproducing the seasonal cycle of NCP in this area. This novel approach provides the possibilities to study the carbon cycle in the SCS with a much higher temporal and spatial resolution, as well as more insights for metabolic state in the oligotrophic subtropical gyres.",

keywords = "Argo float, net community production, satellite-derived net community production, South China Sea Basin, temporal variation",

author = "Yibin Huang and Bo Yang and Bingzhang Chen and Guoqiang Qiu and Haili Wang and Bangqin Huang",

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AU - Wang, Haili

AU - Huang, Bangqin

PY - 2018/1/31

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N2 - For the first time, the net community production (NCP) was estimated over a complete annual cycle in the basin of the South China Sea (SCS) using in situ oxygen measurements from an Argo profiling float and an oxygen mass balance model. The annual NCP from July 2014 to July 2015 was estimated to be 2.7 mol C m−2 yr−1 (calculated to the deepest winter mixed layer depth of 56 m), with the uncertainties ranging from 0.9 ~ 2.2 mol C m−2 yr−1. NCP estimates followed a monsoonal pattern with higher values in the cold season (November to April) when northeast monsoon prevailed and low values in the warm season (June to September) when this area was dominated by the southwest monsoon. Most of the net heterotrophic events occurred in the warm season. The magnitude and seasonal pattern derived from our results agree with previous export production studies based on discrete measurements. Comparison with satellite-derived NCP revealed that the results derived with NPP from Carbon-based Production Model (CbPM) were closer to the Argo measurements than the results derived with NPP from Vertically Generalized Production Model (VGPM) in magnitude; while the VGPM-based approach did a better job in reproducing the seasonal cycle of NCP in this area. This novel approach provides the possibilities to study the carbon cycle in the SCS with a much higher temporal and spatial resolution, as well as more insights for metabolic state in the oligotrophic subtropical gyres.

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