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Article

Distribution and Driving Mechanism of N2O in Sea Ice and Its Underlying Seawater during Arctic Melt Season

1
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361000, China
2
Key Laboratory of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361000, China
3
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Bruno Charrière
Water 2022, 14(2), 145; https://doi.org/10.3390/w14020145
Received: 15 September 2021 / Revised: 20 December 2021 / Accepted: 4 January 2022 / Published: 7 January 2022
(This article belongs to the Special Issue Ice-Ocean-Atmosphere Exchanges in the Arctic Region and Its Impacts)
Nitrous oxide (N2O) is the third most important greenhouse gas in the atmosphere, and the ocean is an important source of N2O. As the Arctic Ocean is strongly affected by global warming, rapid ice melting can have a significant impact on the N2O pattern in the Arctic environment. To better understand this impact, N2O concentration in ice core and underlying seawater (USW) was measured during the seventh Chinese National Arctic Research Expedition (CHINARE2016). The results showed that the average N2O concentration in first-year ice (FYI) was 4.5 ± 1.0 nmol kg−1, and that in multi-year ice (MYI) was 4.8 ± 1.9 nmol kg−1. Under the influence of exchange among atmosphere-sea ice-seawater systems, brine dynamics and possible N2O generation processes at the bottom of sea ice, the FYI showed higher N2O concentrations at the bottom and surface, while lower N2O concentrations were seen inside sea ice. Due to the melting of sea ice and biogeochemical processes, USW presented as the sink of N2O, and the saturation varied from 47.2% to 102.2%. However, the observed N2O concentrations in USW were higher than that of T-N2OUSW due to the sea–air exchange, diffusion process, possible N2O generation mechanism, and the influence of precipitation, and a more detailed mechanism is needed to understand this process in the Arctic Ocean. View Full-Text
Keywords: nitrous oxide; Arctic Ocean; sea ice; underlying seawater; ice melting nitrous oxide; Arctic Ocean; sea ice; underlying seawater; ice melting
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MDPI and ACS Style

Liu, J.; Zhan, L.; Wang, Q.; Wu, M.; Ye, W.; Zhang, J.; Li, Y.; Wen, J.; Chen, L. Distribution and Driving Mechanism of N2O in Sea Ice and Its Underlying Seawater during Arctic Melt Season. Water 2022, 14, 145. https://doi.org/10.3390/w14020145

AMA Style

Liu J, Zhan L, Wang Q, Wu M, Ye W, Zhang J, Li Y, Wen J, Chen L. Distribution and Driving Mechanism of N2O in Sea Ice and Its Underlying Seawater during Arctic Melt Season. Water. 2022; 14(2):145. https://doi.org/10.3390/w14020145

Chicago/Turabian Style

Liu, Jian, Liyang Zhan, Qingkai Wang, Man Wu, Wangwang Ye, Jiexia Zhang, Yuhong Li, Jianwen Wen, and Liqi Chen. 2022. "Distribution and Driving Mechanism of N2O in Sea Ice and Its Underlying Seawater during Arctic Melt Season" Water 14, no. 2: 145. https://doi.org/10.3390/w14020145

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