Characteristics of dimethylsulfide, ozone, aerosols, and cloud condensation nuclei in air masses over the northwestern Pacific Ocean
Characteristics of dimethylsulfide, ozone, aerosols, and cloud condensation nuclei in air masses over the northwestern Pacific Ocean
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西北太平洋气团中二甲硫醚、臭氧、气溶胶和云凝结核的特征
DOI：
10.1029/1998jd100108
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发表时间：
1999
影响因子：
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通讯作者：
Hiroshi L. Tanaka
中科院分区：
文献类型：
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作者：
Ippei Nagao;K. Matsumoto;Hiroshi L. Tanaka
1994年12月至1996年10月，在西北太平洋的小笠原母岛对几种微量气体和气溶胶进行了长期测量。大陆对硫化合物、臭氧（O3）和云凝核（CCN）浓度的影响是根据等熵轨迹分析将气团分为七类的基础上估计的。 5月至10月，来自北太平洋中部的气团占主导地位，硫化合物和CCN的浓度被视为清洁海洋空气。从该气团中甲磺酸与非海盐硫酸盐（NSS）的摩尔比以及二甲基硫醚（DMS）和CCN之间的正相关性的结果可以得出结论，DMS对NSS和CCN的产生有很大贡献。另一方面，11 月至次年 3 月，大陆和人为物质最好通过主要大陆气团输送到西北太平洋。亚洲大陆流出物浓度的增加估计为 O3 2.8 倍、SO2 3.9 倍、0.5% 过饱和度（0.5% CCN）激活的 CCN 3.5 倍、1.0% CCN 4.7 倍、NSS 5.5 倍。此外，CCN过饱和光谱还受到大陆物质的影响，导致云滴数浓度增强2倍。每个气团的 DMS 和 O3 的日变化显示出白天最小值和夜间最大值的模式，这种模式通常出现在偏远的海洋中，尽管每个气团的幅度不同。因此，可以得出结论，即使在大陆气团中，一氧化氮（NOx）对白天O3产生的影响和硝酸盐（NO3）自由基对DMS夜间氧化的影响也很小。
Long-term measurements of several trace gases and aerosols were carried out from December 1994 to October 1996 at Ogasawara Hahajima Island over the northwestern Pacific Ocean. The continental impact on the concentrations of sulfur compounds, ozone (O3), and cloud condensation nuclei (CCN) was estimated on the basis of the classification of air mass into seven types by isentropic trajectory analysis. From May to October, the air mass originating from the central North Pacific Ocean is predominant and regarded as the clean marine air for the concentrations of sulfur compounds and CCN. From the results of the molar ratio of methane sulfonic acid to non-sea-salt sulfate (NSS) and the positive correlation between dimethylsulfide (DMS) and CCN in this air mass it can be concluded that DMS largely contributes to the production of NSS and CCN. On the other hand, continental and anthropogenic substances are preferably transported to the northwestern Pacific Ocean by the predominant continental air mass from November to March. The enhancement of concentrations by the outflow from the Asian continent are estimated by a factor of 2.8 for O3, 3.9 for SO2, 3.5 for CCN activated at 0.5% supersaturation (0.5% CCN), 4.7 for 1.0% CCN, and 5.5 for NSS. Moreover, the CCN supersaturation spectra are also affected by the continental substances resulting in factor 2 of enhancement of cloud droplet number concentration. The diurnal variations of DMS and O3 for each air mass show a pattern of daytime minimum and nighttime maximum, which are typically found in remote ocean, even though those amplitudes are different for each air mass. Consequently, it can be concluded that the influence of nitric oxides (NOx) for the daytime O3 production and nitrate (NO3) radical for the nighttime oxidation of DMS are small even in the continental air mass.
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