I was reading a Scientific American story, “Controversial Spewed Iron Experiment Succeeds as Carbon Sink” (by David Biello), when I came across this sentence:
“The problem for scientists is that oceanic waters tend to mix, which makes monitoring and delineating an experiment in the ocean challenging.”
I'm wondering what “delineate” means in this context. I think I grasp the general idea of this sentence, but it is the exact meaning of the word that has been troubling me.
Could someone kindly enlighten me on this?