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Distribution patterns of nitrous oxide during the summer season in the Prydz Bay, eastern Southern Ocean 认领 引用 被引量：1
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作者 Jiexia Zhang Damian LArévalo-Martínez +6 位作者 Liyang Zhan Liqi Chen Jun Zhao Wangwang Ye Man Wu Yuhong Li Jian Liu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2025年第4期90-100,共11页
The global ocean is a major source of the climate-relevant atmospheric trace gas nitrous oxide(N2O).However,an accurate assessment of the global oceanic emissions of N2O is hampered by missing data on dissolved ... The global ocean is a major source of the climate-relevant atmospheric trace gas nitrous oxide(N2O).However,an accurate assessment of the global oceanic emissions of N2O is hampered by missing data on dissolved N2O from large regions such as the Southern Ocean.To address this deficit,N2O was measured in the Prydz Bay in February 2015 during the 31st Chinese National Antarctic Research Expedition.N2O concentrations(saturation)in the surface layer were generally low(undersaturation with respect to atmospheric equilibrium)and ranged from 13.3 nmol/L to 16.1 nmol/L(83%–102%)at the time of sampling.A comparison of our observations with archived data revealed that no discernible trend in N2O concentrations in the surface waters of Prydz Bay could be detected for the period between 2006 and 2015.Temperature and salinity changes driven by meltwater input were the predominant controls on N2O concentrations in surface waters.At depth,the distribution of N2O concentrations was dominated by production via nitrification in offshore deep waters and vertical convection in the shelf waters,where concentrations were lower and gradients were less steep.Our results suggest a rather unusual pattern of N2O distribution in the Prydz Bay(low N2O in shelf waters compared with the open ocean),providing important insights into the coastal dynamics of N2O in high-latitude polar regions. 展开更多
关键词 nitrous oxide(N2O) greenhouse gases sea-to-air flux Prydz Bay Southern Ocean
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Significant spatiotemporal pattern of nitrous oxide emission and its influencing factors from a shallow eutropic lake in Inner Mongolia,China 认领 引用
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作者 Guohua Li Sheng Zhang +8 位作者 Xiaohong Shi Shengnan Zhao Liyang Zhan Xueru Pan Fan Zhang Haifeng Yu Yue Sun Lauri Arvola Jussi Huotari 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第3期488-499,共12页
Eutrophic shallow lakes are generally considered as a contributor to the emission of nitrous oxide(N2O),while regional and global estimates have remained imprecise.This due to a lack of data and insufficient unders... Eutrophic shallow lakes are generally considered as a contributor to the emission of nitrous oxide(N2O),while regional and global estimates have remained imprecise.This due to a lack of data and insufficient understanding of the multiple contributing factors.This study characterized the spatiotemporal variability in N2O concentrations and N2O diffusive fluxes and the contributing factors in LakeWuliangsuhai,a typical shallow eutrophic and seasonally frozen lake in Inner Mongolia with cold and arid climate.Dissolved N2O concentrations of the lake exhibited a range of 4.5 to 101.2 nmol/L,displaying significant spatiotemporal variations.The lowest and highest concentrations were measured in summer and winter,respectively.The spatial distribution of N2Ofluxwas consistent with that of N2O concentrations.Additionally,the hotspots of N2O emissions were detected within close to the main inflow of lake.The wide spatial and temporal variation in N2O emissions indicate the complexity and its relative importance of factors influencing emissions.N2O emissions in different lake zones and seasons were regulated by diverse factors.Factors influencing the spatial and temporal distribution of N2O concentrations and fluxes were identified as WT,WD,DO,Chl-a,SD and COD.Interestingly,the same factor demonstrated opposing effects on N2O emission in various seasons or zones.This research improves our understanding of N2O emissions in shallow eutrophic lakes in cold and arid areas. 展开更多
关键词 Nitrous oxide Spatial and temporal variation Controlling factors Shallow lakes
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