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Suspended particulate organic carbon and its carbon isotopic composition in the surface water around the Antarctic Peninsula during summer 2017–2018

Published online by Cambridge University Press:  12 May 2023

Yunpeng Lin ,
Yunhai Li Open the ORCID record for Yunhai Li [Opens in a new window] ,
Yuanhui Huang ,
Zhihua Chen ,
Liang Wang ,
Dongyi Li  and
Shuqin Tao
Yunpeng Lin
Affiliation:
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
Yunhai Li*
Affiliation:
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China
Yuanhui Huang
Affiliation:
Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China Key Laboratory of Marine Geology and Metallogeny, Ministry of Natural Resources, Qingdao, 266061, China
Zhihua Chen
Affiliation:
Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China Key Laboratory of Marine Geology and Metallogeny, Ministry of Natural Resources, Qingdao, 266061, China
Liang Wang
Affiliation:
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
Dongyi Li
Affiliation:
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
Shuqin Tao
Affiliation:
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, China
*
liyunhai@tio.org.cn
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Abstract

The concentration of suspended particulate organic carbon (POC) and its carbon isotopic composition (δ13CPOC) were analysed in this study with the aim of exploring the sources and factors influencing levels of POC in the surface water around the Antarctic Peninsula. The scanning electron microscopy results suggest that diatom particles formed the main component of suspended particulate matter, indicating that POC was mainly from in situ primary production. The high concentrations of chlorophyll a and POC in sea water mainly occurred in nearshore and sea-ice edge regions, which might be controlled by nutrient and reactive iron inputs stemming from sea-ice melting. The δ13CPOC in the study area is significantly lower than that in low-latitude waters, with a range of -31.8‰ to -22.8‰ (mean -28.9‰), which was controlled by the high CO2 concentration in the Southern Ocean and might be influenced by phytoplankton growth rates and assemblages. This study helps us to understand material cycling in the Antarctic region under the conditions of global climate change.

Keywords

δ13CPOCenergy-dispersive spectrometerPOCsea icesuspended particulate matter
Type
Earth Sciences
Information
Antarctic Science , Volume 35 , Issue 3 , June 2023 , pp. 194 - 208
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of Antarctic Science Ltd

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