Three-dimensional Analysis of Haze by PM<sub>2.5</sub> and Other Pollutants Based on Ground- and Elevated-level Monitoring in Central Tokyo: Example in Early Part of December 2015

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  • 都心上空と地上の大気質観測によるPM<sub>2.5</sub>等の高濃度時の立体解析―2015年12月上旬の事例―
  • 学生・若手研究者の論文特集 都心上空と地上の大気質観測によるPM₂.₅等の高濃度時の立体解析 : 2015年12月上旬の事例
  • ガクセイ ・ ワカテ ケンキュウシャ ノ ロンブン トクシュウ トシン ジョウクウ ト チジョウ ノ タイキシツ カンソク ニ ヨル PM ₂.₅ トウ ノ コウノウドジ ノ リッタイ カイセキ : 2015ネン 12ガツ ジョウジュン ノ ジレイ

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Abstract

<p>We have been monitoring the air pollutants at the Tokyo Skytree (TST) in order to understand the air quality over central Tokyo. Focusing on the haze event on the 9th and 10th December 2015, we analyzed the causes of the event and differences in the air quality between the ground and upper levels. In the afternoon on Dec. 9, as a result, higher concentrations of SO2 were observed at 320 m AGL on Tokyo Skytree (H320) than near the ground surface (H10). It is likely that a boundary layer was formed from 18:00, and H320 had been influenced by large-point sources and ships. In the night of Dec. 10 when the PM2.5 concentrations went over 90 μg/m3 around central Tokyo, an inversion layer was formed associated with a local front (the so-called the Boso front line). This polluted air mass seemed to be centered at the southeastern part of the 23 wards of Tokyo and distributed below 200 m AGL from 22:00 to 23:00. We also found that the number concentration ratios (NH320/NH10) of smaller particles measured at H320 to H10 increased earlier than those of the larger particles.</p>

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