The characteristics of aerosol methanesulfonic acid (MSA), non-sea-salt sulfate (nss-SO₄²⁻) and MSA/nss-SO₄²⁻ ratio, were measured at high-time resolution (1 h) over the East sea/sea of Japan (R1, 31° - 47°N, 121° - 145°E), western North Pacific Ocean (R2, 47° - 58°N, 145° - 176°E), subarctic western North Pacific (R3, 58° - 66°N, 176°E - 169°W) and Arctic Ocean (R4, 66° - 85°N, 150–174°W) during July–September 2018. The highest MSA levels were observed in R2, with an average of 0.22 ± 0.18 μg m⁻³. These levels were 3–10 times higher than in other regions, correlating with biological productivity. The concentration of nss-SO₄²⁻ decreased with distance from Eurasia. The MSA/nss-SO₄²⁻ ratios were 0.10 ± 0.27, 0.38 ± 0.43, 0.30 ± 0. 36 and 0.39 ± 0.48 over R1, R2, R3 and R4, respectively. Biological sources were larger contributors of nss-SO₄²⁻ in R2 while nss-SO₄²⁻ were affected more by continental anthropogenic sources in R1. Positive and negative relationships between the MSA/nss-SO₄²⁻ ratio and temperature were observed, indicating that temperature may have a different influence on the MSA/nss-SO₄²⁻ ratio. Four high level regions of MSA were observed over the R4, wind speed and temperature were critical factors that affected MSA levels over the R4. Significant depletion of chloride was observed and areas that were more affected by terrestrial sources had a greater chlorine depletion in this study, which means that the magnitude of the chlorine depletion followed the order R1 > R3 > R2 > R4.

在东海以高分辨率（1小时）测量了气溶胶甲磺酸（MSA），非海盐硫酸盐（nss-SO ₄ ^2-）和MSA / nss-SO ₄ ^{2-的特征。}日本/海（R1，31°-47°N，121°-145°E），北太平洋西部（R2，47°-58°N，145°-176°E），北极西太平洋（R3 ，2018年7月至9月的北冰洋，北纬58°-66°N，176°E-169°W和北冰洋（R4、66°-85°N，150–174°W）。在R2中观察到最高MSA水平，平均为0.22±0.18μgm ^-3。这些水平是其他地区的3-10倍，与生物生产力相关。nss-SO ₄ ^2-的浓度随距欧亚大陆的距离而降低。MSA / nss-SO ₄^相对于R1，R2，R3和R4，2-比率分别为0.10±0.27、0.38±0.43、0.30±0。36和0.39±0.48。在R2中，生物来源是nss-SO ₄ ^2−的较大贡献者，而在R1中，nss-SO ₄ ²⁻受大陆人为来源的影响更大。观察到MSA / nss-SO ₄ ^2-与温度之间的正负关系，表明温度可能对MSA / nss-SO ₄ ^2-具有不同的影响比。在R4上观察到四个MSA高水平区域，风速和温度是影响R4上MSA水平的关键因素。在这项研究中，观察到氯的显着耗竭，受陆源影响更大的区域的耗氯量更大，这意味着耗氯量的大小遵循R1> R3> R2> R4的顺序。