Korea Polar Research Institute , 26 Songdomirae-ro, Yeonsu-gu , Incheon 21990 , South Korea.
Institut de Ciències del Mar, CSIC , Pg. Marítim de la Barceloneta 37-49 , 08003 , Barcelona , Catalonia , Spain.
Environ Sci Technol. 2019 Aug 6;53(15):8621-8630. doi: 10.1021/acs.est.9b03399. Epub 2019 Jul 26.
The sources of primary and secondary aerosols in the Arctic are still poorly known. A number of surface seawater samples-with varying degrees of Arctic riverine and sea ice influences-were used in a sea spray generation chamber to test them for their potential to produce sea spray aerosols (SSA) and cloud condensation nuclei (CCN). Our interdisciplinary data showed that both sea salt and organic matter (OM) significantly influenced the SSA production. The number concentration of SSA in the coastal samples was negatively correlated with salinity and positively correlated with a number of OM tracers, including dissolved and chromophoric organic carbon (DOC, CDOM), marine microgels and chlorophyll (Chl-) but not for viral and bacterial abundances; indicating that OM of riverine origin enhances primary aerosol production. When all samples were considered, transparent exopolymer particles (TEP) were found to be the best indicator correlating positively with the ratio number concentration of SSA/salinity. CCN efficiency was not observed to differ between the SSA from the various samples, despite differences in organic characteristics. It is suggested that the large amount of freshwater from river runoff have a substantial impact on primary aerosols production mechanisms, possibly affecting the cloud radiative forcing.
北极地区一次和二次气溶胶的来源仍知之甚少。在一个海水喷雾产生室中使用了一些具有不同程度的北极河流和海冰影响的海水样本，以测试它们产生海水喷雾气溶胶（SSA）和云凝结核（CCN）的潜力。我们的跨学科数据表明，海盐和有机物（OM）都显著影响了 SSA 的产生。沿海样本中的 SSA 数浓度与盐度呈负相关，与多种 OM 示踪剂（包括溶解和有色有机物（DOC、CDOM）、海洋微凝胶和叶绿素（Chl-））呈正相关，但与病毒和细菌丰度无关；这表明河流来源的有机物增强了一次气溶胶的产生。当考虑所有样本时，发现透明的胞外聚合物颗粒（TEP）是与 SSA/盐度比浓度呈正相关的最佳示踪剂。尽管有机特性存在差异，但不同样本的 SSA 的 CCN 效率并没有观察到差异。据认为，大量的河水径流量对一次气溶胶的产生机制有重大影响，可能会影响云的辐射强迫。
