Equilibrator-based measurements of dissolved methane in the surface ocean using an integrated cavity output laser absorption spectrometer
作者单位：Key Laboratory of Global Change and Marine-Atmospheric Chemistry State Oceanic Administration Third Institute of Oceanography State Oceanic Administration
会议名称：《福建省海洋学会2016年学术年会》
会议日期：2016年
学科分类：08[工学] 0816[工学-测绘科学与技术]
关 键 词：methane,equilibrator off-axis integrated cavity output spectroscopy(ICOS) the South Yellow Sea
摘 要：A new off-axis integrated cavity output spectroscopy(ICOS) is coupled to Weiss equilibrator for continuous high-resolution dissolved methane measurement in the surface *** time constant for the equilibrator in freshwater at room temperature is determined via dis-equilibration and re-equilibration *** constant for methane is about 40 *** 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 *** 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 *** 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 ***,all the surface waters are oversaturated,air-to-sea fluxes range from 98.59 to 5 485.35μmol/(m·d)(average value 1 169.74=1=1 398.46 μmol/(m·d)),indicating a source region for methane to the atmosphere.