Non‐sea‐salt sulfate, methanesulfonate, and nitrate aerosol concentrations and size distributions at Cape Grim, Tasmania
Non‐sea‐salt sulfate, methanesulfonate, and nitrate aerosol concentrations and size distributions at Cape Grim, Tasmania
复制标题
塔斯马尼亚角格里姆的非海盐硫酸盐、甲磺酸盐和硝酸盐气溶胶浓度和尺寸分布
DOI：
10.1029/1999jd900283
复制
发表时间：
1999
影响因子：
--
通讯作者：
J. Gras
中科院分区：
文献类型：
--
作者：
M. Andreae;W. Elbert;Yong Cai;T. Andreae;J. Gras
我们收集了每周气溶胶样品，使用大容量的撞击器在20个月（1988-1990年）的时间内，在角格里姆基线站的塔斯马尼亚岛，澳大利亚西北海岸。分析样品中的可溶性离子成分，包括硫酸盐、甲磺酸盐（MS−）、铵、硝酸盐和主要的海盐离子。海盐成分只有轻微的季节性变化，而非海盐（nss）离子都有明显的夏季最大值。显着的年际变化之间的nss离子浓度在两个夏季的调查。Nss硫酸盐和MS−存在于细和粗气溶胶组分中，后者可能与海盐颗粒有关。在冬季期间，粗粒级中的硫酸盐比细粒级中的硫酸盐多。这些观测结果与霾和云滴中液相氧化对硫酸盐气溶胶产生的重要作用是一致的。的硫和氮的物种在格里姆角的季节性行为和它们之间的相互关系表明，DMS氧化是在夏季的主要硫源，而非生物硫源作出显着的贡献，本赛季以外的硫酸盐。氯化萘和云凝结核浓度与硫酸盐、MS−和风速之间的相关性表明，二甲基硫氧化以及较小程度上的海雾形成对氯化萘和云凝结核的数量有贡献。海盐成分的季节性弱，明显的季节性行为在两个硫物种和云凝结核之间的对比支持生物DMS排放的核心作用，在该地区的云凝结核的前体，至少在生物生产季节。
We collected weekly aerosol samples using high-volume impactors over a period of 20 months (1988–1990) at the Cape Grim baseline station on the northwestern coast of Tasmania, Australia. The samples were analyzed for soluble ionic constituents, including sulfate, methanesulfonate (MS−), ammonium, nitrate, and the major sea-salt ions. The sea-salt component showed only a slight seasonal variation, whereas the non-sea-salt (nss) ions all had pronounced summer maxima. Significant interannual variability was seen between the nss ion concentrations measured during the two summers investigated. Nss sulfate and MS− were present both in the fine and coarse aerosol fractions, in the latter presumably associated with sea-salt particles. During the winter period, there was more nss sulfate in the coarse fraction than in the fine fraction. These observations are consistent with an important role of liquid-phase oxidation in haze and cloud droplets for the production of nss sulfate aerosol. The seasonal behavior of the sulfur and nitrogen species at Cape Grim and their mutual correlations suggest that DMS oxidation is the dominant sulfur source during summer, while nonbiogenic sulfur sources make significant contributions to nss sulfate outside of this season. Correlations of CN and CCN concentrations with nss sulfate, MS−, and wind speed suggest that DMS oxidation and, to a lesser extent, seaspray formation contributes to CN and CCN populations. The contrast between the weak seasonality of the sea-salt component and the pronounced seasonal behavior in both sulfur species and CCN supports the central role of biogenic DMS emissions as precursors of CCN in this region, at least in the biologically productive season.