日本地球惑星科学連合2018年大会

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[EJ] Evening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) 17:15 〜 18:30 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-P07] ベトナム・ハノイにおける小型計測器によるPM2.5の長期・多点測定

*岡本 渉1松見 豊1関口 和彦2藤野 毅2三小田 憲史2熊谷貴 美代3藤谷 雄二4Thuy Ly Bich 5Dung Nghiem Trung 5Thuy Nguyen Thi Thu 6Thuy Pham Chau 7梶井 克純8坂本 陽介8 (1.宇宙地球環境研究所 名古屋大学、2.埼玉大学、3.群馬県衛生環境研究所、4.国立環境研究所、5.ハノイ工科大学、6.タイグエン工科大学、7.ベトナム国立農業大学、8.京都大学)

キーワード:PM2.5測定、小型測定器、空気の良さ、大都市、東南アジア

A year round observation of PM2.5 mass concentrations was conducted in Hanoi University of Science and Technology (HUST) from July 2016 to now using newly developed highly sensitive sensors. And also from October 2017 to now, we have installed the PM2.5 sensors in Thai Nguyen University of Technology (TNUT) and Vietnam National University of Agriculture (VNUA). Hourly PM2.5 concentration data in HUST agreed well with corresponding data obtained with a beta attenuation monitor, located 3 km away. The monthly variation showed that PM2.5 levels were high in the dry season, particularly in December (median = 62 mg m−3) and low in the rainy season, particularly in June and July (medians = 19 mg m−3). PM2.5 haze episodes with levels higher than 100 mg m−3 were observed 13 times during the dry season (October 2016–March 2017). These episodes may link to meteorological conditions, because the daily PM2.5 and CO levels increased several days after a cold surge for most of the PM2.5 haze episodes. Two episode events were investigated further in higher temporal resolution. For both events, PM2.5 peaks appeared at midnight for some days after a cold surge, while CO levels often increased at rush hours. For first event, short peaks of PM2.5 (duration of about 1 h) with fast rates of increase of ~5 mg m−3 min-1 were observed. This highlights the importance of high temporal resolution of PM2.5 sensors in assessing of health effect. For second event, a broad peak (duration of one and half days) of PM2.5 with gradual increase was observed together with high CO levels. This research reveals for first time characteristics of PM2.5 haze episode in Hanoi that should be studied further to develop an effective air pollution management in this city. This study is supported by JSPS Kakenhi (17H04483).