Description: | Soil heat flow sensor #5 frequently produced large negative (and incorrect)
values during the period above. The problem ended during a PM visit by
site operations. However, there is no documentation by Site Operations in
the instrumentation report or corrective maintenance report that Site
Operations personnel took action to correct the problem. Site Operations
also told me that they have no record of any changes or corrective
maintenance. Apparently, something fortuitous happened during the PM to
correct the problem. The start date and time of the problem cannot be
determined exactly, but it did begin during a period of missing data from
Feb. 14-25, 1997.
Values affected (and thus incorrect) include:
15 minute: mv_hft5
30 minute: shf5, c_shf5, g5, ave_shf, e, h.
The latent and sensible heat fluxes can be recalculated by using only soil
heat flows 1, 2, 3, and 4 to calculate the average soil heat flow,
ave_shf = (g1 + g2 + g3 + g4)/4
e = -(q + ave_shf)/(1 + bowen)
h = -(e + ave_shf + q) |