Biological micro-particles in rain water
Biological micro-particles in rain water
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DOI：
10.1029/95gl03785
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发表时间：
1996-01-15
影响因子：
5.2
通讯作者：
Morita, M
中科院分区：
文献类型：
--
作者：
Casareto, BE;Suzuki, Y;Morita, M
本工作首次报道了日本静冈静冈和筑波两个地点雨水中生物微粒的形态和化学鉴定。使用配有能量色散X射线分析仪的电子显微镜检查直径大于0.2 μ m的颗粒。雨水中的生物颗粒被发现是细菌和树叶碎片，其中大多数颗粒与矿物质有关。在所有生物颗粒中观察到X射线光谱中的磷和钾峰，其特征在于细菌或叶子的化学成分。雨水中的这些颗粒占总不溶性颗粒的23%至34%，浓度为1.6 x 10（4）至2.4 x 10（4）cm（-3）的雨水。这一发现表明，这些生物颗粒被有效地捕获在云水和/或降水中，它们可能在云凝结和/或冰成核中发挥作用。
This work constitutes the first report on the morphology and chemical identification of biological microparticles in rain water at two sites (Shizuoka and Tsukuba) from Japan, Micro-particles in rain water were deposited directly onto electron microscopic grids using ultracentrifugation. Particles with diameters more than 0.2 mu m were examined using an electron microscope equipped with an energy-dispersive X-ray analyzer. Biological particles in rain water were found to be bacteria and leaf debris, and most of those particles were associated with minerals. Peaks of phosphorus and potasium in the X-ray spectra, which are characterized as chemical components of bacteria or leaves, were observed in all the biological particles. These particles in rain water were present in number percentages of 23 to 34% of the total insoluble particles, with concentrations of 1.6 x 10(4) to 2.4 x 10(4) cm(-3) of rain water. This finding suggests that these biological particles are captured effectively in cloud water and/or precipitation, and that they may play a role in cloud condensation and/or ice nucleation.