据介绍，复杂生命的起源和陆地生态系统的演化，是地球自然史的基本方面。
研究人员提供了地球臭氧层长期稳定的证据。今天大气臭氧的破坏与海洋和大气碘的循环有着内在的联系。本研究在多条独立的地质证据线的支持下，通过碘质量平衡模型进行了检验，结果发现，在地球历史的大部分时间里，海洋碘含量普遍升高。
自约24亿年前氧气上升以来，海洋碘浓度升高，将导致大量无机碘排放到大气中，促进臭氧的催化破坏，并导致大气臭氧不稳定，臭氧水平周期性或持续降低。
在全球范围内，不稳定的低臭氧水平可能持续了大约20亿年，直到大约5亿年前的显生宙早期。研究结果强调，地球臭氧层的延迟稳定对生命，特别是陆地上的生命的进化速度和方向具有重要意义。
附：英文原文
Title: Evolution of the iodine cycle and the late stabilization of the Earth’s ozone layer
Author: Liu, Jingjun, Hardisty, Dalton S., Kasting, James F., Fakhraee, Mojtaba, Planavsky, Noah J.
Issue&Volume: 2025-1-6
Abstract: The origin of complex life and the evolution of terrestrial ecosystems are fundamental aspects of the natural history on Earth. Here, we present evidence for a protracted stabilization of the Earth’s ozone layer. The destruction of atmospheric ozone today is inherently linked to the cycling of marine and atmospheric iodine. Supported by multiple independent lines of geological evidence and examined through an iodine mass balance model, we find that elevated marine iodide content prevailed through most of Earth’s history. Since the rise of oxygen ~2.4 billion years ago, high marine iodide concentrations would have led to significant inorganic iodine emissions to the atmosphere, facilitating catalytic ozone destruction and resulting in atmospheric ozone instability with periodic or persistently lower ozone levels. At a global scale, unstable and low ozone levels likely persisted for about two billion years until the early Phanerozoic, roughly 0.5 billion years ago. The delayed stabilization of the Earth’s ozone layer holds significant implications for the tempo and direction of the evolution of life, in particular life on land.
DOI: 10.1073/pnas.2412898121
Source: https://www.pnas.org/doi/abs/10.1073/pnas.2412898121