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Influence of sea-salt on aerosol radiative properties in the Southern Ocean marine boundary layer

机译：海盐对南大洋海洋边界层气溶胶辐射特性的影响

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There has been considerable debate about the relative importance of sea-salt and sulphate from non-sea-salt sources in determining aerosol radiative effects in the marine boundary layer. In the marine boundary layer, the most numerous aerosols are volatile sulphate particles smaller than about 0.08 μm (ref. 1) and most of the aerosol mass is in a few sea-salt particles larger than 1 μm. Yet intermediate-size aerosols between about 0.08 and 1 μm diameter are the most relevant to the radiative forcing of climate because they efficiently scatter solar radiation and also serve as cloud nuclei. Indeed, Charlson et al.3 hypothesized that oceanic production of sulphate aerosols from the oxidation of dimethyl sulphide could be a powerful feedback in the climate system. It is generally assumed that marine aerosols smaller than about 1 μm are non-sea-salt sulphate, but a recent review cites indirect evidence that many aerosols in the sub-micrometre range contain at least some sea-salt. Here we present direct observational evidence from a remote Southern Ocean region that almost all aerosols larger than 0.13 μm in the marine boundary layer contained sea-salt. These sea-salt aerosols had important radiative effects: they were responsible for the majority of aerosol-scattered light, and comprised a significant fraction of the inferred cloud nuclei.
机译：来自非海盐源的海盐和硫酸盐在确定海洋边界层中的气溶胶辐射效应方面的相对重要性引起了广泛的争论。在海洋边界层中，数量最多的气溶胶是小于约0.08μm的挥发性硫酸盐颗粒（参考文献1），并且大部分气溶胶存在于少数几个大于1μm的海盐颗粒中。然而，直径介于约0.08和1μm之间的中等大小的气溶胶与气候的辐射强迫最相关，因为它们有效地散射了太阳辐射并还充当了云核。的确，Charlson等人3假设，二甲基硫醚的氧化作用在海洋产生的硫酸盐气溶胶可能是气候系统的有力反馈。通常认为小于1μm的海洋气溶胶是非海盐硫酸盐，但是最近的综述引用了间接证据，表明亚微米范围内的许多气溶胶至少包含一些海盐。在这里，我们提供了来自遥远的南大洋地区的直接观测证据，即海洋边界层中几乎所有大于0.13μm的气溶胶都含有海盐。这些海盐气溶胶具有重要的辐射效应：它们是大多数气溶胶散射光的原因，并且占推断云核的很大一部分。

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