Stable carbon and nitrogen isotopes as tracers of sources of suspended particulate organic matter in the Daya Bay in summer

Mou Xinyue; Chen Min; Zhang Kun; Zeng Jian; Yang Weifeng; Zhang Run; Zheng Minfang; Qiu Yusheng

doi:10.3969/j.issn.0253-4193.2017.02.004

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Mou Xinyue, Chen Min, Zhang Kun, Zeng Jian, Yang Weifeng, Zhang Run, Zheng Minfang, Qiu Yusheng. Stable carbon and nitrogen isotopes as tracers of sources of suspended particulate organic matter in the Daya Bay in summer[J]. Haiyang Xuebao, 2017, 39(2): 39-52. doi: 10.3969/j.issn.0253-4193.2017.02.004

Citation:

Mou Xinyue, Chen Min, Zhang Kun, Zeng Jian, Yang Weifeng, Zhang Run, Zheng Minfang, Qiu Yusheng. Stable carbon and nitrogen isotopes as tracers of sources of suspended particulate organic matter in the Daya Bay in summer[J]. Haiyang Xuebao, 2017, 39(2): 39-52. doi: 10.3969/j.issn.0253-4193.2017.02.004

Citation:

Mou Xinyue, Chen Min, Zhang Kun, Zeng Jian, Yang Weifeng, Zhang Run, Zheng Minfang, Qiu Yusheng. Stable carbon and nitrogen isotopes as tracers of sources of suspended particulate organic matter in the Daya Bay in summer[J]. Haiyang Xuebao, 2017, 39(2): 39-52. doi: 10.3969/j.issn.0253-4193.2017.02.004

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Stable carbon and nitrogen isotopes as tracers of sources of suspended particulate organic matter in the Daya Bay in summer

doi: 10.3969/j.issn.0253-4193.2017.02.004

College of Ocean Earth Sciences, Xiamen University, Xiamen 361102, China

Received Date: 2016-08-17
Rev Recd Date: 2016-09-28

Abstract

Abstract

Stable carbon and nitrogen isotopes were used to distinguish sources of suspended particulate organic matter in the Daya Bay in summer 2015. Our results showed that the values of δ¹³C_POC and δ¹⁵N_PN ranged from -25.7‰ to -17.4‰ and from -6.3 to 10.4‰, with averages of -20.2‰ and 8.2‰, respectively. The spatial variation of δ¹³C_POC and δ¹⁵N_PN reflected the effect of different sources of organic matter. The high POC, PN, δ¹³C_POC and δ¹⁵N_PN were observed around Xizhou Island, indicating a phytoplankton bloom. The high POC, PN, δ¹⁵N_PN, but low δ¹³C_POC occurred around the Fanhe Habour in the northeastern bay, pointing to the contribution of riverine/estuarine organic matter. Meanwhile, the low values of δ¹³C_POC and δ¹⁵N_PN were observed in the north coastal areas, reflecting the input of terrigenous organic matter and anthropogenic wastes. Based on the mass balance of δ¹³C_POC and δ¹⁵N_PN, the contribution of autochthonous, terrigenous and riverine/estuarine organic matter were estimated as 70%, 13% and 17% respectively. The particulate organic matter in the Daya Bay in summer was dominated by marine autochthonous source. The contents of autochthonous organic matter showed a decrease from the inner to the mouth of the bay, corresponding to the decrease of primary productivity. The riverine/estuarine organic matter showed high contents in the northeastern bay. However, distribution of terrigenous organic matter showed different patterns in the surface and bottom layers. The low contents of terrigenous organic matter in surface waters were observed in the central bay, while they increased from the inner to the mouth of the bay in the bottom. The spatial distribution of terrigenous organic matter in the Daya Bay was regulated by the offshore distance, the Pearl river diluted water and the coastal upwelling along the eastern part of Guangdong province.
- particulate organic matter,
- carbon isotope,
- nitrogen isotope,
- Daya Bay

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