The dynamic surface tension of atmospheric aerosol surfactants reveals new aspects of cloud activation.
The dynamic surface tension of atmospheric aerosol surfactants reveals new aspects of cloud activation.
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DOI：
10.1038/ncomms4335
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发表时间：
2014-02-25
影响因子：
16.6
通讯作者：
Jaffrezo, Jean-Luc
中科院分区：
文献类型：
--
作者：
Noziere, Barbara;Baduel, Christine;Jaffrezo, Jean-Luc
在地球大气层中，气溶胶粒子活化成云滴既是气候收支的一个关键过程，也是不确定性的一个主要来源。它的研究面临着重大的实验挑战，因为没有技术可以测量亚微米大气颗粒物的主要驱动参数，拉乌尔项和表面张力σ。此外，大气气溶胶中的表面活性剂组分直到最近才被分离出来。在这里，我们提出了第一个动态调查的总表面活性剂部分的大气气溶胶，证明吸附障碍，限制其梯度（分区）的颗粒，并应提高其成云效率相比，目前的模式。结果还表明，表面活性剂在亚微米大气颗粒物中的平衡时间应超出大多数在线仪器的检测范围。这种仪器和理论上的缺陷与大气和实验室观测结果是一致的，并且可能限制了到目前为止对云激活的理解。 从大气中的气溶胶粒子形成云滴是很难理解的实验和理论。在这里，作者测量了大气气溶胶的动态表面张力，并证明了以前被忽视的过程，可能会提高这种理解。
The activation of aerosol particles into cloud droplets in the Earth’s atmosphere is both a key process for the climate budget and a main source of uncertainty. Its investigation is facing major experimental challenges, as no technique can measure the main driving parameters, the Raoult’s term and surface tension, σ, for sub-micron atmospheric particles. In addition, the surfactant fraction of atmospheric aerosols could not be isolated until recently. Here we present the first dynamic investigation of the total surfactant fraction of atmospheric aerosols, evidencing adsorption barriers that limit their gradient (partitioning) in particles and should enhance their cloud-forming efficiency compared with current models. The results also show that the equilibration time of surfactants in sub-micron atmospheric particles should be beyond the detection of most on-line instruments. Such instrumental and theoretical shortcomings would be consistent with atmospheric and laboratory observations and could have limited the understanding of cloud activation until now. The formation of cloud droplets from aerosol particles in the atmosphere is difficult to comprehend experimentally and theoretically. Here, the authors measure the dynamic surface tension of atmospheric aerosols and evidence previously overlooked processes, likely to improve this understanding.
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