| 基于水-汽平衡器的离轴积分腔输出光谱法(ICOS)走航观测海水中溶解CH4 |
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| 引用本文： | 李玉红,詹力扬,张介霞,陈立奇.基于水-汽平衡器的离轴积分腔输出光谱法(ICOS)走航观测海水中溶解CH4[J].海洋学报(英文版),2015,34(6):34-41. |
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| 作者姓名： | 李玉红 詹力扬 张介霞 陈立奇 |
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| 作者单位： | 国家海洋局海洋-大气化学与全球变化重点实验室, 福建 厦门 361005;国家海洋局第三海洋研究所, 福建 厦门 361005,国家海洋局海洋-大气化学与全球变化重点实验室, 福建 厦门 361005;国家海洋局第三海洋研究所, 福建 厦门 361005,国家海洋局海洋-大气化学与全球变化重点实验室, 福建 厦门 361005;国家海洋局第三海洋研究所, 福建 厦门 361005,国家海洋局海洋-大气化学与全球变化重点实验室, 福建 厦门 361005;国家海洋局第三海洋研究所, 福建 厦门 361005 |
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| 基金项目： | The Scientific Research Foundation of Third Institute of Oceangraphy under contract No. 2013004; the National Natural Science Foundation of China (NSFC) under contract Nos 40906102 and 41230529; the CHINARE under contract Nos 2012-2013 (01-04-02), (01-02-01) and (03-04-02). |
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| 摘 要： | A new off-axis integrated cavity output spectroscopy(ICOS) is coupled to Weiss equilibrator for continuous highresolution 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 3.980×10–6, 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. Key words: methane, equilibrator, off-axis integrated cavity output spectroscopy(ICOS), South Yellow Sea
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| 关 键 词： | 溶解CH4 水-汽平衡器 离轴积分腔输出光谱法(ICOS) 南黄海 |
| 收稿时间： | 2014/5/30 0:00:00 |
| 修稿时间： | 2014/9/14 0:00:00 |
Equilibrator-based measurements of dissolved methane in the surface ocean using an integrated cavity output laser absorption spectrometer |
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| LI Yuhong,ZHAN Liyang,ZHANG Jiexia and CHEN Liqi.Equilibrator-based measurements of dissolved methane in the surface ocean using an integrated cavity output laser absorption spectrometer[J].Acta Oceanologica Sinica,2015,34(6):34-41. |
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| Authors: | LI Yuhong ZHAN Liyang ZHANG Jiexia and CHEN Liqi |
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| Institution: | Key Laboratory of Global Change and Marine-Atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China |
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| Abstract: | A new off-axis integrated cavity output spectroscopy (ICOS) is coupled to Weiss equilibrator for continuous highresolution 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 3.980×10-6, 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. |
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| Keywords: | methane equilibrator off-axis integrated cavity output spectroscopy (ICOS) South Yellow Sea |
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