Ice-free tropical waterbelt for Snowball Earth events questioned by uncertain clouds

Ice-free tropical waterbelt for Snowball Earth events questioned by uncertain clouds
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雪球地球事件的无冰热带水带受到不确定云层的质疑

DOI:
10.1038/s41561-022-00950-1
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发表时间:
2022
期刊:
影响因子:
18.3
通讯作者:
P. Joaquim
P. Joaquim
中科院分区:
地球科学1区
文献类型:
--
作者:
J. Hörner;A. Voigt;P. Joaquim

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在新元古代(1,000 -541 Ma)期间,活跃的热带冰川达到海平面的地质证据表明,全球海洋完全被冰覆盖,这是发展硬雪球地球假说的关键观测结果。这些条件很难与复杂的海洋生物通过雪球地球冰川的生存相协调,这导致了另一种水带情景,其中大规模的避难所以热带海洋中狭窄的无冰地带的形式存在。在这里,我们评估是否在低纬度地区无雪暗海冰的水带的情况下,是合理的使用模拟从两个气候模型运行的各种云处理结合能量平衡模型。我们的模拟表明,水带状态不是一个强大的和自然出现的新元古代气候特征。强烈的短波反射的混合相云,除了一个低覆盖率的裸海冰,需要地质相关的水带状态。由于混合相云及其与辐射的相互作用存在很大的不确定性,我们的结果强烈质疑了水带情景可以解释新元古代地质的想法。因此,新元古代的生命可能面临着一个坚硬的雪球地球的恶劣条件。
Geological evidence of active tropical glaciers reaching sea level during the Neoproterozoic (1,000–541 Ma), suggesting a global ocean completely covered in ice, was the key observation in the development of the hard Snowball Earth hypothesis. These conditions are hard to reconcile with the survival of complex marine life through Snowball Earth glaciations, which led to alternative waterbelt scenarios where a large-scale refugium was present in the form of a narrow ice-free strip in the tropical ocean. Here we assess whether a waterbelt scenario maintained by snow-free dark sea ice at low latitudes is plausible using simulations from two climate models run with a variety of cloud treatments in combination with an energy-balance model. Our simulations show that waterbelt states are not a robust and naturally emerging feature of Neoproterozoic climate. Intense shortwave reflection by mixed-phase clouds, in addition to a low albedo of bare sea ice, is needed for geologically relevant waterbelt states. Given the large uncertainty in mixed-phase clouds and their interaction with radiation, our results strongly question the idea that waterbelt scenarios can explain the Neoproterozoic geology. Hence, Neoproterozoic life has probably faced the harsh conditions of a hard Snowball Earth.
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发表时间: 2017-06-15
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影响因子: 4.6
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发表时间: 2015
期刊:
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作者:
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