I am interested in the total amount of sites within FLUXNET that is using open path technique and if possible also how many o

Provided by: Bob Cook, ORNL on 2/26/2009
We have instrument information about open-path and closed path sensors at 78 towers.

Of these, 59 towers have minimum air temperature below zero centigrade; these towers have the following instruments.

29 Open Path (LI-7500)
19 Closed Path (LI-820, LI-6251, LI-6262, LI-7000,)
11 Both types