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首页> 外文期刊>Ecology letters >'Ultraviolet spring' and the ecological consequences of catastrophic impacts
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'Ultraviolet spring' and the ecological consequences of catastrophic impacts

机译：“紫外线的春天”和灾难性影响的生态后果

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摘要

Asteroid and comet impacts cause ozone depletion. For the first time, we have quantified the photobiological characteristics of these events and speculate on some of the associated ecological consequences. Following the clearing of stratospheric dust after "impact winter", levels of damaging UVB radiation (280-315 nm) could increase by at least 100%, resulting in an "ultraviolet spring". Many of the taxa stressed by the cold and dark conditions of impact are the same that would be stressed by large increases in UVB radiation. Furthermore, depletion of dissolved organic carbon (DOC) by impact-induced acid rain would increase UVB penetrability into freshwater systems. Although an increase in VUB radiation is an attractive hypothesis for exacerbating the demise of land animals at the Cretaceous-Tertiary (K/T) boundary, e.g. dinosaurs, our calculations suggest the impact into rare sulphate-rich target rock may have prevented an ultraviolet spring in this case. If the K/T impact event had occurred in any other region of Earth, the stress to the biosphere would probably have been considerably greater.
机译：小行星和彗星的撞击会导致臭氧消耗。我们首次对这些事件的光生物学特征进行了量化，并推测了一些相关的生态后果。在“影响冬天”之后清除平流层的尘埃之后，破坏性的UVB辐射水平（280-315 nm）可能至少增加100％，从而产生“紫外线之春”。在寒冷和黑暗的条件下，受到影响的许多分类单元与UVB辐射的大量增加所强调的分类单元相同。此外，撞击引起的酸雨消耗溶解的有机碳（DOC）将增加UVB对淡水系统的渗透性。尽管VUB辐射的增加是一个引人注目的假说，可加剧白垩纪-第三纪（K / T）边界处陆地动物的灭绝。恐龙，我们的计算表明，在这种情况下，撞击到稀有富含硫酸盐的目标岩石中可能阻止了紫外线的侵袭。如果K / T撞击事件发生在地球的任何其他区域，则对生物圈的压力可能会更大。

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