SGP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor 5 Incorrect Data

Soil heat flow sensor #5 periodically outputted incorrect values from
mid-August 1994 until mid-January 1995.  The output often indicated large
negative heat flow.  The sensor was replaced on January 23, 1995, even
though the previous week of data was correct.  The data affected (and thus
incorrect) includes:

15 minute: mv_hft5
30 minute: shf5, c_shf5, g5, ave_shf, e, h.

The dates and times (GMT) of incorrect values are listed below.  Only half
hour times are listed.

08/19/94  1700-2300
10/13/94  1800-2330
10/14/94  0000-1500
10/17/94  2030-2100
10/28/94  2030-2230
12/20/94  0630-2330
12/21/94  0000-2330
12/22/94  0000-2330
12/23/94  0000-0530
12/26/94  1700-2330
12/27/94  0000-0130, 1630
01/02/95  0600-2330
01/03/95  0000-2330
01/04/95  0000-2330
01/05/95  0000-1700, 2200-2330
01/06/95  0000-2330
01/07/95  0000-2330
01/08/95  0000-2330
01/09/95  0000-0230, 0900-2330
01/10/95  0000-2330
01/11/95  0000-2330
01/12/95  0000-2330
01/13/95  0000-2330
01/14/95  0000-0400, 0800-2330
01/15/95  0000-0300, 1200-2330
01/16/95  0000-1600

The latent and sensible heat fluxes can be recalculated by using only soil
heat flows 1 through 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)

• Surface latent heat flux(latent_heat_flux)
• Surface soil heat flux, average of fluxes 1-5(surface_soil_heat_flux_avg)
• Soil heat flow 5(soil_heat_flow_5)
• Soil heat flow 5, corrected for soil moisture(corr_soil_heat_flow_5)
• Surface soil heat flux 5(surface_soil_heat_flux_5)
• Surface sensible heat flux(sensible_heat_flux)

• Soil heat flow 5 (mV)(soil_heat_flow_5_mv)