| Description: | Soil heat flow sensor #2 periodically outputted incorrect values during the
period indicated. The output often indicated large negative heat flow.
Problems with good connections of the sensor leads have caused this problem
in the past. However, no maintenance was performed before the problem
ceased on 15 July 1996. No data is available for 20-27 and 29 July, so it is
not known if the problem occurred during that time.
The data affected (and thus incorrect) includes:
15 minute: mv_hft2
30 minute: shf2, c_shf2, g2, ave_shf, e, h.
The dates and times (GMT) of incorrect values are listed below. Only half
hour times are listed.
06/19/96 0230, 0800-1000
06/30/96 0230-1530, 2130-2330
07/01/96 0100-0830
07/02/96 0400, 0500-1500
07/03/96 0130-0400, 1430-1530
07/04/96 0200-0230
07/05/96 0030, 0230
The latent and sensible heat fluxes can be recalculated by using only soil
heat flows 1 and 3 through 5 to calculate the average soil heat flow,
ave_shf = (g1 + g3 + g4 + g5)/4
e = -(q + ave_shf)/(1 + bowen)
h = -(e + ave_shf + q) |