Description: | Soil Temperature #2 was intermittently incorrect.
The cause is unknown.
The indicated measurements that are calculated using
soil temperature are also incorrect.
Soil moisture #2 (30 minute only) was also affected
because version 6 of the EBBR datalogger program
uses a multiplication of soil temperature and soil
moisture as part of the adjustment of soil moisture for
soil temperature. This was discovered to be a poor
technique soon after it was implemented, but E2 will
continue to use version 6 until a replacement EBBR
unit is available. When soil temperature #2 is large
negative, soil moisture #2 is often twice as large
as it should be.
EBBR unit changeout dates are listed on the EBBR
instrument web page. |
Suggestions: | Recalculate the average soil heat flow (ave_shf),
latent heat flux (e), and sensible heat flux (h)
using only soil sets 1, 3, 4, and 5, as follows:
ave_shf = (g1 + g3 + g4 + g5)/4
e = -(q + ave_shf)/(1 + Bowen)
h = -(q + e + ave_shf)
where q is net radiation and Bowen is the Bowen ratio. |