Its interesting they're not talking about the shape of the curve. That likely means its not strongly indicative either way. If its "water hitting rocks" then

Its interesting they're not talking about the shape of the curve. That likely means its not strongly indicative either way. If its "water hitting rocks" then you'd expect a curve with a linear to declining rate during the rise. If its microbial action then you'd expect a curve showing characteristics of reproducing microbes, like an increasing growth rate within "reasonable" biological reproduction limits. We can measure way outside reasonable biological reproduction limits. One problem with "water hitting rocks" is mars has a lot of rocks and less water every year so why they're still outgassing today is a bit mysterious.