Journal
ATMOSPHERIC ENVIRONMENT
Volume 45, Issue 15, Pages 2593-2597Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2010.10.055
Keywords
Nitrogen dioxide; MAX-DOAS; Long-range transport
Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [20840052]
- Grants-in-Aid for Scientific Research [20840052, 22310004] Funding Source: KAKEN
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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 degrees N, 128.25 degrees 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. (C) 2011 Elsevier Ltd. All rights reserved.
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