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首页> 外文期刊>Aerobiologia >Thermal convection over East Antarctica: Potential microorganism dispersal
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Thermal convection over East Antarctica: Potential microorganism dispersal

机译：南极东部的热对流：潜在的微生物扩散

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摘要

The Indian Antarctic station, Maitri is in the Schirmacher oasis of east Antarctica. The oasis is covered with snow/ ice; except for the local summer season when it gets deglaciated and exposes the small hilly region. During summer, minute microorganisms are observed near water bodies of this rocky terrain. In the year 1996 a monostatic acoustic sounder probed planetary boundary layer dynamics over this region. From the data it is observed that the thermal convection (both free and forced) persist for 5.63% of the time in the whole year. The occurrence of free convection predominates in the local summer season around midday, while sporadic cases of forced convection have been recorded during the autumn and winter seasons. The onset of convection is mainly at 0600 hrs to 1200 hrs, while the cessation period is limited within 1400 hrs to 1900 hrs. The cessation of convection is basically governed by the katabatic wind flow around the Schirmacher region and it indicates that the interior of Antarctica or the polar cap ice becomes cooler much faster than the rocky region of Schirmacher oasis. Examples taken from the literatures on atmospheric structure and their effects on dispersalof microorganisms and their distribution by the wind are discussed. The study of monostatic acoustic sounder for thermal convections/plumes may form input for the study of dispersal, survival, metabolic activities and dispersion model of microorganisms. The application of convection/plume to aerobiology can also lead to improvements in forecasting, monitoring and understanding the various mechanisms of organism dispersal.
机译：印度南极站Maitri位于南极东部的Schirmacher绿洲中。绿洲被雪/冰覆盖；除了当地的夏季融化并暴露出小山丘地区的夏季外。在夏季，在此多岩石的地形水体附近观察到了微小的微生物。在1996年，一台单静噪探测器探测了该地区的行星边界层动力学。从数据中可以观察到，全年热对流（自由对流和强迫对流）的持续时间为5.63％。自由对流的发生主要发生在当地夏季的正午左右，而在秋季和冬季则记录到零星的强迫对流事件。对流的开始主要在0600小时至1200小时，而停止时间被限制在1400小时至1900小时。对流的停止基本上由围绕Schirmacher区域的合成风来控制，这表明南极洲或极地冰盖的内部变得比Schirmacher绿洲的岩石区域凉快得多。讨论了从大气结构及其对微生物扩散及其在风中的分布影响的文献中获得的实例。用于热对流/羽流的单静态声测深器的研究可为研究微生物的扩散，存活，代谢活性和扩散模型提供输入。对流/气溶胶在航空生物学中的应用还可以改善对预测，监测和理解生物扩散机制的各种能力。

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