You are listed in the end credits and at the following link since Youtube wouldn't let me put all the credits in the description field: http://bit.ly/18E6S9p The credits are also accessible by clicking on the credit link when it appears in the video during the credits at the end.
@allanox, as I recall, it was a pretty clear day, though not as cold as it often gets up there. (Because I could use my hands to operate the recorder ;-) I think that there was snow on the ground, and it's possible that the humidity was average or high, because when it's really cold up there the humidity is low.
i have not heard that sound for many years. as a boy, i used to play along a rural railroad line that paralleled a small creek. at times, other small creeks would join in from the other side, running through 3-foot culverts. in those days, i was small enough to walk inside. it was fun yelling and listening to the reverberation. especially the time i screwed up enough courage to do that when the train ran overhead. but many times, i hear this reverberating, musical running water. thanks for the flashback.