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arXiv 1405.4576astro-ph.EPnlin.AOphysics.bio-phphysics.geo-ph
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有人居住行星的宜居带

The Habitable Zone of Inhabited Planets

Jorge I. Zuluaga, Juan F. Salazar, Pablo Cuartas-Restrepo, German Poveda

摘要:

在本文中,我们讨论和说明的假设,生命大大改变了行星环境的状态,因此,修改的HZ估计为一个无人居住的星球的限制。这一假设导致了有人居住行星的宜居带(以下简称InHZ)的引入,这里定义为生命与其非生物环境之间复杂的相互作用能够产生合理的平衡态的区域,这些平衡状态具有生命本身存在和持久存在的必要物理条件。我们支持我们的假设,一个InHZ的三个理论论据,多个证据来自观测的地球系统,一些概念性的实验和说明性的数值模拟。从概念上讲,InHZ和非生物HZ(AHZ)之间的区别取决于生命作为一种新兴物理现象的独特和强大的特性,而不是依赖于地球上的特定生命形式。我们的目标是为InHZ模型的发展提供概念基础,该模型将持续的生命-环境相互作用结合起来。虽然以前的作者已经探讨了生命对可居住性的影响,但在研究开发为什么在确定HZ限制时应该系统地包括生命的原因方面存在差距。我们在这里不提供明确的限制,但我们通过简单的数值模型(作为一个寓言的有人居住的星球)的AHZ的限制可以修改,包括合理的生物群和环境之间的相互作用。这些例子也旨在提出这样一个问题,即如果在这些简单的动力学系统中存在生命,可以修改HZ的极限,那么如果生命被包括在AHZ的既定模型中,这些极限将如何改变。

英文摘要:

In this paper we discuss and illustrate the hypothesis that life substantially alters the state of a planetary environment and therefore, modifies the limits of the HZ as estimated for an uninhabited planet. This hypothesis lead to the introduction of the Habitable Zone for Inhabited planets (hereafter InHZ), defined here as the region where the complex interaction between life and its abiotic environment is able to produce plausible equilibrium states with the necessary physical conditions for the existence and persistence of life itself. We support our hypothesis of an InHZ with three theoretical arguments, multiple evidences coming from observations of the Earth system, several conceptual experiments and illustrative numerical simulations. Conceptually the diference between the InHZ and the Abiotic HZ (AHZ) depends on unique and robust properties of life as an emergent physical phenomenon and not necesarily on the particular life forms bearing in the planet. Our aim here is to provide conceptual basis for the development of InHZ models incorporating consistently life-environment interactions. Although previous authors have explored the effects of life on habitability there is a gap in research developing the reasons why life should be systematically included at determining the HZ limits. We do not provide here definitive limits to the InHZ but we show through simple numerical models (as a parable of an inhabited planet) how the limits of the AHZ could be modified by including plausible interactions between biota and its environment. These examples aim also at posing the question that if limits of the HZ could be modified by the presence of life in those simple dynamical systems how will those limits change if life is included in established models of the AHZ.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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