日本地球惑星科学連合2015年大会

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セッション記号 A (大気水圏科学) » A-AS 大気科学・気象学・大気環境

[A-AS21] 大気化学

2015年5月27日(水) 18:15 〜 19:30 コンベンションホール (2F)

コンビーナ:*澤 庸介(気象研究所海洋・地球化学研究部)、竹川 暢之(首都大学東京 大学院理工学研究科)、金谷 有剛(独立行政法人海洋研究開発機構地球環境変動領域)、高橋 けんし(京都大学生存圏研究所)、谷本 浩志(国立環境研究所)

18:15 〜 19:30

[AAS21-P12] 北西太平洋上の大気中水素濃度観測

*坪井 一寛1松枝 秀和1澤 庸介1丹羽 洋介1高辻 慎也2藤原 宏章2出原 幸志郎2奥田 智紀2森 陽樹2 (1.気象研究所、2.気象庁)

キーワード:水素

Molecular hydrogen (H2) plays a significant role in global atmospheric chemistry due to its role in CH4 -CO-OH cycling and water vapor source in the stratosphere. The balance of H2 could change with the implementation of a new H2 energy carrier. Therefore, it is important to establish its global budget and atmospheric trend (WMO/GAW Report No.197, 2011).
We started atmospheric H2 measurement at Minamitorishima (MNM) from Nov. 2011. The measurement system using a GC-RGD (gas chromatographs equipped with a reduction gas detector) was installed for sirmulteneouse analyses of H2 and carbon monoxide at 3 stations of MNM, Yonagunijima (YON), and Ryori (RYO) operated by Japan Meteorological Agency (JMA). In this study, high-precision H2 standard gases are prepared to determine the atmospheric concentrations from the output signal of the GC/RGD.
The H2 concentrations at MNM varied seasonally from 490 ppb to 560 ppb with a yearly mean of about 520 ppb. The H2 variations often show distinct episodic events with enhanced concentrations on a synoptic scale in winter. This result indicates that H2 increases are caused by the long-range transport of Asian polluted air masses to the station, suggesting that H2 is a good tracer for identifying continental air masses in winter season. On the other hand, the H2 concentrations are higher and stable in summer season. This result indicates that the maritime air masses are dominated, and the influence of soil absorption was small.