Stable carbon isotopic composition of suspended particulate organic matter in the Prydz Bay and its adjacent areas

Ren Chunyan; Chen Min; Gao Zhongyong; Guo Laodong; Jia Renming; Liu Xiao; Qiu Yusheng; Zheng Minfang

doi:10.3969/j.issn.0253-4193.2015.12.008

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Ren Chunyan, Chen Min, Gao Zhongyong, Guo Laodong, Jia Renming, Liu Xiao, Qiu Yusheng, Zheng Minfang. Stable carbon isotopic composition of suspended particulate organic matter in the Prydz Bay and its adjacent areas[J]. Haiyang Xuebao, 2015, 37(12): 74-84. doi: 10.3969/j.issn.0253-4193.2015.12.008

Citation:

Ren Chunyan, Chen Min, Gao Zhongyong, Guo Laodong, Jia Renming, Liu Xiao, Qiu Yusheng, Zheng Minfang. Stable carbon isotopic composition of suspended particulate organic matter in the Prydz Bay and its adjacent areas[J]. Haiyang Xuebao, 2015, 37(12): 74-84. doi: 10.3969/j.issn.0253-4193.2015.12.008

Citation:

Ren Chunyan, Chen Min, Gao Zhongyong, Guo Laodong, Jia Renming, Liu Xiao, Qiu Yusheng, Zheng Minfang. Stable carbon isotopic composition of suspended particulate organic matter in the Prydz Bay and its adjacent areas[J]. Haiyang Xuebao, 2015, 37(12): 74-84. doi: 10.3969/j.issn.0253-4193.2015.12.008

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Stable carbon isotopic composition of suspended particulate organic matter in the Prydz Bay and its adjacent areas

doi: 10.3969/j.issn.0253-4193.2015.12.008

1.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
2.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
3.
Key Lab of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
4.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;School of Freshwater Sciences, University of Wisconsin-Milwaukee, WI 53204, USA

Received Date: 2015-09-30
Rev Recd Date: 2015-10-18

Abstract

Abstract

To better understand carbon and particle dynamics in the Prydz Bay and its adjacent areas,stable carbon isotopic composition in suspended particulate organic matter(POM) along with aqueous CO₂,nutrients and hydrographic data were measured to examine the spatial and vertical distributions of δ¹³C_POC and their controlling factors during the 29^th Chinese Antarctic Research Expedition. Furthermore,carbon isotope fractionation factor during the assimilation of dissolved inorganic carbon(DIC) by phytoplankton in the mixed layer was estimated. Our results showed that δ¹³C_POC ranged from-28.5‰ to-21.1‰ with an average of-24.6‰,showing an increase trend from the inner bay to open waters outside the Bay. Carbon isotope fractionation factor during phytoplankton DIC assimilation in the mixed layer was estimated to be 23.4‰ based on the relationship between δ¹³C_POC and 1/[CO_2(aq)],and was the major controlling factor for δ¹³C_POC values in the mixed layer in the Prydz Bay and its adjacent areas. Values of δ¹³C_POC increased in general with increasing depth in the study areas,ascribing to the isotope fractionation during POM remineralization.
- suspended particulate organic matter,
- δ¹³C_POC,
- isotope fractionation factor,
- Prydz Bay

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