Distribution and source of particulate organic carbon in the Arctic Laptev Sea during late summer and early fall

Xia Yi; Hu Limin; Huang Yuanhui; Bai Yazhi; Ye Jun; Fan Di; Meng Xianwei; Shi Xuefa

doi:10.12284/hyxb2022102

Volume 44 Issue 7

Jul. 2022

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Article Navigation > Haiyang Xuebao > 2022 > 44(7): 58-70

Xia Yi，Hu Limin，Huang Yuanhui, et al. Distribution and source of particulate organic carbon in the Arctic Laptev Sea during late summer and early fall[J]. Haiyang Xuebao，2022, 44(7)：58–70 doi: 10.12284/hyxb2022102

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Distribution and source of particulate organic carbon in the Arctic Laptev Sea during late summer and early fall

doi: 10.12284/hyxb2022102

Xia Yi^1
,,
Hu Limin^{2, 3
,
,},
Huang Yuanhui^{1, 3},
Bai Yazhi^{1, 3},
Ye Jun^{2, 3},
Fan Di⁴,
Meng Xianwei^{1, 3},
Shi Xuefa^{1, 3}

1.
Key Laboratory of Marine Geology and Mineralization, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Key Laboratory of Seabed Science and Exploration Technology, Ministry of Education, School of Marine Geosciences, Ocean University of China, Qingdao 266100, China
3.
Marine Geological Process and Environmental Function Laboratory, Pilot National Laboratory of Marine Science and Technology (Qingdao), Qingdao 266237, China
4.
Marine Isotope and Geological Dating Platform , Pilot National Laboratory of Marine Science and Technology (Qingdao), Qingdao 266237, China

Received Date: 2021-09-14
Rev Recd Date: 2021-12-10

Available Online: 2022-07-01

Publish Date: 2022-07-01

Abstract

Abstract

With the intensification of global warming, the source sink process of carbon in the Arctic shelf-edge sea is becoming more and more important in the study of global carbon cycle. As a typical continental shelf marginal sea in the Arctic Ocean, the source, transportation and burial of sedimentary organic carbon in this area are unique under the influence of rivers, sea ice, marine primary productivity and coastal erosion. Based on the sampling of suspended particulate matter (SPM) and hydrological data obtained from the second Sino-Russian Arctic joint expedition during late summer and early fall in 2018, we foucus on the distribution characteristics, sources and influencing factors of particulate organic carbon (POC) in the Laptev Sea. The results show that POC ranges from 35.27 μg/L to 1 185.58 μg/L, with an average of 172.65 μg/L. Under the effect of river input, coastal erosion and marine primary productivity, the distribution of surface POC shows a decreased trend from near shore towards offshore; the bottom POC is mainly controlled by sediments resuspension, and the high content of POC appears in the east of Lena River Delta. There was a significant positive correlation between SPM concentration and POC concentration, indicating its direct impact on the occurrence of POC; a more positive relation is found among the bottom layer samples, which may indicate the varied origin of POC in different layers. The value of δ¹³C_POC in study area value is between −31.03‰ and −25.79‰, and the value of δ¹³C in surface layers is obviously depleted compared with the bottom layer, which is even lower than the end-member of the surrounding terrestrial contributor, suggesting that these POC is not derived from land-based origin. The utilization of the terrestrial POC degraded dissolved inorganic carbon by offshore phytoplankton maybe responsible for this depletion of δ¹³C offshore, which could also be an important process on the supply and source apportionment of POC in this Arctic coastal area.
- Arctic; Laptev Sea,
- particulate organic carbon,
- total suspended solids,
- source,
- terrigenous input

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References(76)

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