Measurements of Gaseous Peroxides in the Oceanic Lower Atmosphere

The observations were carried out at Cape Hedo Atmosphere and Aerosol Monitoring Station (CHAAMS, 26∞87 ¢ N, 128∞26¢ E, Fig. 2). Okinawa Main Island often receives air masses from China, Korea, and Japan, as well as from the Pacific Ocean. In addition, we can sometimes observe air masses transported from South East Asia. Around the station there is no significant local emission source. The nearest big city is Nago, which is located 50 km southwest with a population of 60,000. The capital of Okinawa prefecture, Naha (population 310,000), is one hundred km southwest of Nago. These cities are far from the station but sometimes we could observe the effects of local emission from these cities, depending on the wind direction. Intensive measurements were made on Feb. 4–5, 2008 (spring), June 10–14, 2008 Introduction