Temporal Change of Export Production at Xisha of the Northern South China Sea
文献类型：期刊论文
| 作者 | Li, Qian P.; Chen, Yinchao; Wu, Zhengchao |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
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| 出版日期 | 2018 |
| 卷号 | 123期号:12页码:9305 |
| 关键词 | biological pump export production time series physical and biogeochemical modeling northwestern South China Sea |
| ISSN号 | 2169-9275 |
| DOI | 10.1029/2017JC013619 |
| 英文摘要 | Physical-biological interaction within the upper ocean influences fixed organic carbon with various efficiencies leading to spatial and temporal change of carbon export in the ocean, which is important for global biogeochemical dynamics but is inadequately understood in the northern South China Sea (NSCS). Here the temporal variations of primary and export production are investigated using a 1-D physical-biogeochemical coupling model at a pelagic station of Xisha (XS) in the NSCS. At this station, the model reproduces the satellite sea surface observations, the depth-integrated primary production, and the sinking flux of particulate organic carbon at 500m from a moored sediment trap. By synthesizing these results, we investigate the long-term dynamics of the biological pump with the focus on export production. We compared our results at XS with that at A Long-Term Oligotrophic Habitat Assessment (ALOHA) in the North Pacific subtropical gyre. While the surface export at XS is greater than ALOHA, the stronger subsurface remineralization at XS has resulted in a similar week biological pump as ALOHA. The high surface export and subsurface flux attenuation at XS are caused by its physical dynamics that support a stronger upward nitrate flux than ALOHA. We also find a time lag of about 20days between primary production and export production at XS, which has led to the large variability of export ratios in the subsurface layers. Further analyses suggest that the temporal variations of primary and export productions are largely driven by the change of turbulent mixing and Ekman pumping that control the vertical nutrient fluxes into the upper ocean. Plain Language Summary Sinking flux of particles from the sea surface to the ocean interior is critical for ocean biogeochemical dynamics. Spatial and temporal variations of particle fluxes, driven by physical-biological interaction in the ocean, can affect the efficiency of the biological pump and hence the ocean carbon cycle. The Xisha (XS) area, located between the northwestern shelf and the deep basin of the northern South China Sea, is relatively less studied compared to other regions of the northern South China Sea. Climate variability here could be controlled by the East Asian Monsoon on seasonal timescales and by the tropical Pacific El Nino-Southern Oscillation (ENSO) on interannual timescales. However, the mechanisms driving the long-term changes of sinking organic particles and their associated biogeochemical fluxes in the XS remain less addressed. This paper describes a model-data synthesis study of the export production at a pelagic time series station of XS. We find a generally weak biological pump at the XS site with a high surface export and a high subsurface remineralization. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/17793]  |
| 专题 | 南海海洋研究所_热带海洋环境国家重点实验室(LTO) |
| 作者单位 | 1.[Chen, Yinchao 2.Li, Qian P.] Univ Chinese Acad Sci, Sch Earth Sci, Beijing, Peoples R China 3.[Chen, Yinchao 4.Li, Qian P.] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China 5.Wu, Zhengchao |
| 推荐引用方式 GB/T 7714 | Li, Qian P.,Chen, Yinchao,Wu, Zhengchao. Temporal Change of Export Production at Xisha of the Northern South China Sea[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2018,123(12):9305, 9319. |
| APA | Li, Qian P.,Chen, Yinchao,&Wu, Zhengchao.(2018).Temporal Change of Export Production at Xisha of the Northern South China Sea.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,123(12),9305. |
| MLA | Li, Qian P.,et al."Temporal Change of Export Production at Xisha of the Northern South China Sea".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 123.12(2018):9305. |
入库方式： OAI收割
来源：南海海洋研究所
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