类日恒星和M-矮星周围温带行星上的水生生物圈特征
Characteristics of aquatic biospheres on temperate planets around Sun-like stars and M-dwarfs
摘要：
依赖于产氧光合作用的水生生物圈预计将在具有大规模海洋的类地行星上发挥重要作用，有机化合物的生物合成）。我们调查的性质，水生生物圈包括类地生物群的可居住的岩石行星轨道类太阳恒星和晚型M-矮星，如TRAPPIST-1。特别是，我们估计这些特性如何演变与可用通量的光合有效辐射（PAR）和环境海洋温度（$T_W$），后者构成了一个关键的环境变量。我们发现，许多显着的性质，如光合作用区的深度和净初级生产力（即，有效固碳率）对PAR通量和$T_W$敏感，当PAR通量降低或$T_W$增加时，有效固碳率均显著下降。最后，我们探索我们的分析的影响，太阳类恒星和M-矮星周围的系外行星。
英文摘要：
Aquatic biospheres reliant on oxygenic photosynthesis are expected to play an important role on Earth-like planets endowed with large-scale oceans insofar as carbon fixation (i.e., biosynthesis of organic compounds) is concerned. We investigate the properties of aquatic biospheres comprising Earth-like biota for habitable rocky planets orbiting Sun-like stars and late-type M-dwarfs such as TRAPPIST-1. In particular, we estimate how these characteristics evolve with the available flux of photosynthetically active radiation (PAR) and the ambient ocean temperature ($T_W$), the latter of which constitutes a key environmental variable. We show that many salient properties, such as the depth of the photosynthesis zone and the net primary productivity (i.e., the effective rate of carbon fixation), are sensitive to PAR flux and $T_W$ and decline substantially when the former is decreased or the latter is increased. We conclude by exploring the implications of our analysis for exoplanets around Sun-like stars and M-dwarfs.
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