The O 3 concentration in the marine boundary layer over the northern North Pacific Ocean was measured on a commercial vessel. No significant longitudinal gradient was seen over the area between 170°E and 135°W. A spring O 3 maximum and summer minimum were observed. A diurnal cycle of O 3 was found, with a high nighttime concentration and a low daytime concentration. Throughout the year an O 3 decrease was clearly observed just after sunrise, which is known as sunrise ozone destruction (SOD). SOD may act a…
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