کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4439881 | 1311036 | 2011 | 5 صفحه PDF | دانلود رایگان |
Since March 2007, continuous NO2 profile observations have been performed using ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) at Cape Hedo (26.87°N, 128.25°E) on Okinawa Island, Japan. NO2 observations show particularly low values of less than 0.3 ppbv at 0–1 km in most cases during the northern summer, whereas higher concentrations of more than 1 ppbv were occasionally observed during winter and spring. Trajectory analysis using meteorological analysis data showed that the high NO2 concentrations were caused mainly by rapid air-mass transport in the marine boundary layer, with strong westerly winds bringing the air mass from coastal China to the study site within ∼24 h. Such rapid transport is a major cause of NO2 variations at Cape Hedo, even though the region is located approximately 700 km from China.
► NO2 profile observations have been performed by MAX-DOAS at Cape Hedo, Japan.
► Higher NO2 concentrations were occasionally observed during winter and spring.
► The high concentrations were caused by rapid air-mass transport from coastal China.
Journal: Atmospheric Environment - Volume 45, Issue 15, May 2011, Pages 2593–2597