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Number-size distribution of aerosol particles and new particle formation events in tropical and subtropical Pacific Oceans

机译：热带和亚热带太平洋海洋中气溶胶颗粒的数量分布和新的颗粒形成事件

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Number size distributions of aerosol particles with diameters of 10-500 nm in the marine boundary layer were observed continually onboard the R/V Hakuho Maru over the equatorial and subtropical North Pacific and South Pacific during December 2011 March 2012. Number-size distributions over each area were parameterized using a sum of up to three lognormal functions. Bi-modal size distributions with peak diameters at 30-80 nm (Aitken mode) and 100-200 nm (accumulation mode) were observed frequently. Larger peak diameters of Aitken and accumulation modes were observed over the eastern equator, where 5-day backward trajectories showed that the air masses had derived from high chlorophyll oceanic regions without precipitation. Smaller peak diameters and low concentrations were often observed over the North Pacific. The trajectories show that such air mass originated from oceanic regions with less chlorophyll, exhibiting high precipitation frequency. New particle formation (NPF) events have often been observed over the mid-latitude eastern South Pacific with a low condensation sink (CS) and some dimethyl sulfide, although none was observed over the equator, where CS was higher. The lesser CS condition at NPF events was mostly correlated with local precipitation or precipitation along the trajectories within I day. These results suggest that differences of the number size distribution and occasions of NPF events among sea areas most closely accord with precipitation along the trajectories. (C) 2016 The Authors. Published by Elsevier Ltd.
机译：2011年12月，在赤道和亚热带北太平洋和南太平洋的Rakus Maru R / V上连续观察到海洋边界层中直径为10-500 nm的气溶胶颗粒的数量分布。每个分布的数量分布使用最多三个对数正态函数的总和来对区域进行参数化。经常观察到峰直径在30-80 nm（Aitken模式）和100-200 nm（累积模式）的双峰大小分布。在东部赤道上观察到较大的艾特肯峰和积累模式的峰值，那里的5天后退轨迹表明，空气质量来自高叶绿素的海洋区域，没有降水。在北太平洋，通常观察到较小的峰直径和低浓度。轨迹表明，这种空气质量来自叶绿素较少的海洋区域，表现出较高的降水频率。在南太平洋中纬度东部东部经常观察到新的颗粒形成（NPF）事件，其凝结槽（CS）较低，并且含有二甲基硫醚，尽管在CS较高的赤道上未观察到。 NPF事件中较小的CS条件主要与1天之内的局部降水或沿轨道的降水有关。这些结果表明，海域中NPF事件的数量大小分布和发生时间的差异与沿轨道的降水最接近。 （C）2016作者。由Elsevier Ltd.发布

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