日本地球惑星科学連合2018年大会

講演情報

[EJ] ポスター発表

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-AS06] 大気化学

2018年5月23日(水) 13:45 〜 15:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:岩本 洋子(広島大学 生物圏科学研究科)、中山 智喜(長崎大学 大学院水産・環境科学総合研究科)、豊田 栄(東京工業大学物質理工学院、共同)、江口 菜穂(Kyushu University)

[AAS06-P03] Working standard gas saving system for in-situ CO2 and CH4 measurements and calculation method for concentrations and uncertainty.

*Motoki Sasakawa1Noritsugu Tsuda2Toshinobu Machida1Mikhail Arshinov3Davidov Denis3Alexandrov Fofonov3 (1.NIES National Institute of Environmental Studies、2.Global Environmental Forum、3.Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch, Russia)

キーワード:Carbon dioxide, Methane, Siberia, in-situ measurement, CRDS

Continuous measurements of CO2 and CH4 concentration have been carried out using a tower network in Siberia (JR-STATION: Japan-Russia Siberian Tall Tower Inland Observation Network) to study the spatial and temporal variations of CO2 and CH4 and estimate the distribution of the flux over this vast area (Sasakawa et al., 2010, 2012, 2013) where only a few atmospheric investigations had been made. Transport of working standard gases to remote sites is a significant issue. Thus, to reduce the consumption of the gases, Watai et al. (2010) developed a system that utilizes in-situ air as sub-working standard gas to track the baseline drift of an NDIR. The calibrations using the working standard gases were carried out twice a day. Watai et al. (2010) installed the system at the first tower site in West Siberia (Berezorechka). We modified the working gas saving system and further added a CH4 sensor (Suto et al., 2010), then expanded the tower network. We evaluated the uncertainty of the concentrations obtained from this modified system. From the year of 2015, we installed a Cavity Ring-Down Spectroscopy (CRDS; Picarro inc.) at Karasevoe, Demyanskoe, and Noyabrsk. We thus validate the recent data with the data by the CRDSs.

References
Sasakawa, M. et al., Tellus 62B, 403-416, 2010.
Sasakawa, M. et al., Tellus 64B, doi:10.3402/tellusb.v64i0.17514, 2012.
Sasakawa, M. et al., J. Geophys. Res. 118, 1-10, doi:10.1002/jgrd.50755, 2013.
Suto, H. et al., J. Atmos. Ocean. Tech. 27, 1175-1184, 2010.
Watai, T. et al., Atmos. Ocean. Tech. 27, 843-855, 2010.