Description: | Soil heat flux probes #4 had been indicating soil heat fluxes that were
higher than the other four probes. It was decided to replace it.
On November 24, 1993 Soil Heat Flux probe #4 was replaced, resulting in
outputs more similar to the other four probes. This PIF does not
invalidate previous measurements by the old probe #4, but only indicates
data that is bad as a result of the replacement procedure. This procedure
resulted in some bad data for the adjoining soil heat flux probes #3 and #5
also. Bad data for #3 includes the 1600 GMT half hour, and 5 and 15 minute
periods between 1530 and 1600 GMT. Bad data for #4 includes half hour
times of 1600 through 1900 GMT, with 5 and 15 minute data inbetween those times
being invalid as well. Bad data for #5 includes half hour times of 1630
and 1700 GMT, with 5 and 15 minute periods inbetween those times being
invalid as well. Corrupted 30 minute values of shf4, c_shf4, g4, ave_shf, h,
and e, and corrupted 15 minute values of mv_hft4 resulted. The quantities
shf4, c_shf4, g4, and mv_hft4 are bad data values and are not recoverable.
The other quantities can be recalculated using the remaining functioning
set(s) of soil sensors.
Use the following equations:
ave_shf = (gs summed)/n,
where n is the number of probes functioning
e = -(q + ave_shf)/(1 + bowen) where q is net radiation, and bowen is
Bowen Ratio
h = e * bowen |