Birch and conifer pollen are efficient atmospheric ice nuclei
Birch and conifer pollen are efficient atmospheric ice nuclei
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桦树和针叶树花粉是有效的大气冰核
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
H. Grothe
中科院分区：
文献类型：
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作者：
B. Pummer;H. Bauer;J. Bernardi;S. Bleicher;H. Grothe
摘要生物气溶胶（细菌、花粉、孢子等）的冰核化过程是一个越来越感兴趣的话题，因为它们对冰云形成的影响，从而对辐射强迫，全球气候的一个重要参数，还没有完全理解。在这里，我们表明，5个花粉的不同种强烈不同的冰核的行为。实验室实验的平均冻结温度范围为240 ~ 255 K。由于最有效的冰核（银、欧洲赤松和普通杜松花粉）的分布范围可达北方林线，它们的冰核活性可能是冰核保护机制。更有趣的是，已经证明，与花粉接触后又从花粉体中分离出来的水，其成核效果与花粉粒本身一样好。因此，冰核必须是位于花粉表面的易悬浮的大分子。一旦被提取出来，它们可以比重花粉粒在大气中分布得更远，从而增加花粉对冰云形成的影响，即使是在对流层上部。我们的实验
Abstract The ice nucleation of bioaerosols (bacteria, pollen, spores, etc.) is a topic of grow-ing interest, since their impact on ice cloud formation and thus on radiative forcing, animportant parameter in global climate, is not yet fully understood. Here we show that 5 pollen of different species strongly differ in their ice nucleation behaviour. The aver-age freezing temperatures in laboratory experiments range from 240K to 255K. Asthe most efficient nuclei (silver birch, Scots pine and common juniper pollen) have adistribution area up to the Northern timberline, their ice nucleation activity may be acryoprotective mechanism. Far more intriguingly, it has turned out that water, which 10 has been in contact with pollen and then been separated from the bodies, nucleates asgood as the pollen grains themselves. So the ice nuclei have to be easily-suspendablemacromolecules located on the pollen surface. Once extracted, they can be distributedfurther through the atmosphere than the heavy pollen grains and so augment the im-pact of pollen on ice cloud formation even in the upper Troposphere. Our experiments
影响因子：
3.3
作者：
Murray, B. J.;Broadley, S. L.;Murray, E. J.
通讯作者：
Murray, E. J.