Equilibrator-based measurements of dissolved methane in the surface ocean using an integrated cavity output laser absorption spectrometer

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• 作者：Yuhong Li ; Liyang Zhan ; Jiexia Zhang ; Liqi Chen
• 关键词：methane ; equilibrator ; off ; axis integrated cavity output spectroscopy (ICOS) ; South Yellow Sea
• 刊名：Acta Oceanologica Sinica
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：34
• 期：6
• 页码：34-41
• 全文大小：1,225 KB
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• 作者单位：Yuhong Li (1) (2)
  Liyang Zhan (1) (2)
  Jiexia Zhang (1) (2)
  Liqi Chen (1) (2)
  
  1. Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen, 361005, China
  2. Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005, China
  
• 刊物主题：Oceanography; Climatology; Ecology; Engineering Fluid Dynamics; Marine & Freshwater Sciences; Environmental Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1869-1099

文摘

A new off-axis integrated cavity output spectroscopy (ICOS) is coupled to Weiss equilibrator for continuous high-resolution dissolved methane measurement in the surface ocean. The time constant for the equilibrator in freshwater at room temperature is determined via dis-equilibration and re-equilibration experiments. The constant for methane is about 40 min. The system is calibrated using a standard gas of 3.980×10?, and the precision of the ICOS for methane is 0.07%. This system is equipped onboard to measure the spatial distribution in methane concentrations of South Yellow Sea (SYS) along the cruise track from Shanghai to Qingdao. Result shows that the methane concentration varies from 2.79 to 36.36 nmol/L, reveals a significant pattern of methane source in SYS, and a distinct decreasing trend from south to north. The peak value occurs at the coast area outside mouth of the Changjiang River, likely to be affected by the Changjiang diluted water mass dissolving a large amount of rich in methane. Moreover, all the surface waters are oversaturated, air-to-sea fluxes range from 98.59 to 5 485.35 μmol/(m2·d) (average value (1 169.74±1 398.46) μmol/(m2·d)), indicating a source region for methane to the atmosphere.