JpGU-AGU Joint Meeting 2017

講演情報

[JJ] 口頭発表

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-AS11] [JJ] 大気化学

2017年5月23日(火) 10:45 〜 12:15 A10 (東京ベイ幕張ホール)

コンビーナ:入江 仁士(千葉大学環境リモートセンシング研究センター)、町田 敏暢(国立環境研究所)、谷本 浩志(国立環境研究所)、岩本 洋子(広島大学 生物圏科学研究科)、座長:谷本 浩志(国立環境研究所)

11:45 〜 12:00

[AAS11-05] Emissions of CO2, CO, and CH4 from peat forest fires on Sumatra Island in non El-Niño year 2013

*奈良 英樹1谷本 浩志1遠嶋 康徳1向井 人史1野尻 幸宏1町田 敏暢1 (1.国立環境研究所 地球環境研究センター)

キーワード:温室効果気体、東南アジア、バイオマス燃焼

We observed substantial enhancements of atmospheric trace gases and aerosols (CO2, CH4, CO, PM2.5, PM10, and black carbon) in summer of 2013, with continuous instruments onboard the NIES voluntary observing ships sailing in the Southeast Asia region. The enhancements were observed off the east coast of the Malay Peninsula and in the straits of Malacca along the shipping route, associated with prominent enhancements in CO. The 6-year climatology (2008 – 2013) of the monthly mean CO mixing ratios in these areas shows the maximum in June, followed by moderate but relatively high values in following months of July and August. Our analysis combining in-situ measurements, satellite observations, and an air trajectory analysis showed that the observed enhancements were due mainly to the intensive biomass burnings that occurred in the central Sumatra. We examined the quantitative relationships between the observed CO2, CO, and CH4 during the CO enhancement events. Strong correlation was found between these gases, and the calculated emission ratios of CO/CO2 suggested large contribution of peat forest fires to the observed enhancements (CO/CO2 = 135 ppb/ppm). We determined the emission factors (EF) of CO2, CO, and CH4 from the peat forest fires using the emission ratios of CO/CO2 and CH4/CO2, showing the EFs of 1722, 132.0, and 6.27 (g/kg) for CO2, CO, and CH4, respectively. These EFs were compared with those calculated from the current emission inventory (GFED version 4S), which are 1671, 144.5, and 11.95 (g/kg) for CO2, CO, and CH4 respectively. These EFs were consistent with each other except CH4, suggesting that the EF used in GFED4S is overestimated for CH4 from peat fires.