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Differences in nitrous oxide distribution patterns between the Bering Sea basin and Indian Sector of the Southern Ocean

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Abstract

Nitrous oxide (N2O) distribution patterns in the Bering Sea basin (BSB) and Indian Sector of the Southern Ocean (ISSO) were described and compared. In both sites, the waters were divided into four layers: surface layer, subsurface layer, N2O maximum layer, and deep water. Simulations were made to find out the most important factors that regulate the N2O distribution patterns in different layers of both sites. The results showed that in the surface water, N2O was more understaturated in the ISSO than the BSB. This phenomenon in the surface water of ISSO may result from ice melt water intrusion and northeastward transport of the Antarctic surface water. Results of the rough estimation of air-sea fluxes during the expedition were (−0.34±0.07)–(−0.64±0.13) μmol/(m2·d) and (−1.47±0.42)–(−1.77±0.51) μmol/(m2·d) for the BSB and the ISSO, respectively. Strongly stratified surface layer and temperature minimum layer restricted exchange across the thermocline. The N2O maximum existed in higher concentration and deeper in the BSB than the ISSO, but their contribution to the upper layer by eddy diffusions was negligible. In deep waters, a concentration difference of 5 nmol/L N2O between these two sites was found, which suggested that N2O production occurred during thermohaline circulation. N2O may be a useful tracer to study important large-scale hydrographic processes.

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Authors and Affiliations

  1. College of Ocean and Earth Science, Xiamen University, Xiamen, 361005, China

    Liqi Chen & Jiexia Zhang

  2. Key Laboratory of Global Change and Marine-Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005, China

    Liqi Chen, Jiexia Zhang, Liyang Zhan, Yuhong Li & Heng Sun

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  1. Liqi Chen
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Correspondence to Liqi Chen.

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Foundation item: The National Natural Science Foundation of China (NSFC) under contract Nos 40906102 and 41230529; the CHINARE under contract Nos 2012–2015 (-01-04-02), 2012-2015 (01-02-01) and 2012-2015 (03-04-02); the CAA International Cooperation Projects under contract Nos IC201201 and IC201308.

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Chen, L., Zhang, J., Zhan, L. et al. Differences in nitrous oxide distribution patterns between the Bering Sea basin and Indian Sector of the Southern Ocean. Acta Oceanol. Sin. 33, 9–19 (2014). https://doi.org/10.1007/s13131-014-0484-8

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  • DOI: https://doi.org/10.1007/s13131-014-0484-8

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