Space: Science & Technology / 2021 / Article / Fig 6

Review Article

Biosphere 2’s Lessons about Living on Earth and in Space

Figure 6

Graph showing the impact of various leak rates on the ability to detect the slow decline in atmospheric oxygen within Biosphere 2. Line A is the actual oxygen decline, and Line B is that detected in Biosphere 2 with a leak rate below 10%. Lines C to G are from simulations of what would have been detected by oxygen sensors if the leak rates were higher. Line E shows that at leak rates as low as 400% per year ((1.1% per day), the oxygen decline would not have been detected [5, 10].