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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Photophoretic levitation of engineered aerosols for geoengineering
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Photophoretic levitation of engineered aerosols for geoengineering

机译：用于地球工程的工程气溶胶的光悬浮

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摘要

Aerosols could be injected into the upper atmosphere to engineer the climate by scattering incident sunlight so as to produce a cooling tendency that may mitigate the risks posed by the accumulation of greenhouse gases. Analysis of climate engineering has focused on sulfate aerosols. Here I examine the possibility that engineered nanoparticles could exploit photophoretic forces, enabling more control over particle distribution and lifetime than is possible with sulfates, perhaps allowing climate engineering to be accomplished with fewer side effects. The use of electrostatic or magnetic mate* rials enables a class of photophoretic forces not found in nature. Photophoretic levitation could loft particles above the stratosphere, reducing their capacity to interfere with ozone chemistry; and, by increasing particle lifetimes, it would reduce the need for continual replenishment of the aerosol. Moreover, particles might be engineered to drift poleward enabling albedo modification to be tailored to counter polar warming while minimizing the impact on equatorial climates.
机译：可以将气溶胶注入到高层大气中，通过散射入射的阳光来控制气候，从而产生降温的趋势，从而可以减轻温室气体积累带来的风险。气候工程分析的重点是硫酸盐气溶胶。在这里，我检查了工程化的纳米颗粒可以利用电泳力，与硫酸盐相比能够更好地控制颗粒分布和寿命的可能性，也许可以实现气候工程而副作用更少。静电或磁性材料的使用可实现自然界中不存在的一类光致电泳力。电泳悬浮可能使粒子飞越平流层上方，从而降低其干扰臭氧化学的能力；并且，通过延长颗粒的寿命，可以减少对气雾剂的持续补充。此外，可以将粒子设计为向极极漂移，从而可以对反照率进行修改，以应对极地变暖，同时最大程度地减少对赤道气候的影响。

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