SGP/EBBR/E22 - Reprocess: Soil Heat Flow Sensor 4 Incorrect Data

Soil heat flow sensor #4 periodically output incorrect values during the 
period indicated.  The output often indicated large negative heat flow.  The
sensor was replaced on March 19, 1996, which corrected the problem.  The data 
affected (and thus incorrect) includes:

15 minute: mv_hft4
30 minute: shf4, c_shf4, g4, ave_shf, e, h.

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

01/31/96  1500 (shf4 only)
02/10/96  0230-1300, 1400-1600
02/11/96  0100-0900, 1030-1400, 1730-2330
02/12/96  0000-0100, 1200-1230, 1600-1830
02/13/96  0130-0230, 1430, 1600-1700
02/14/96  0130-0230
02/23/96  0330-0530, 1200-2330
02/24/96  0000-0200
02/29/96  0000
03/03/96  0130-0200, 1500-1830
03/04/96  0100-0230, 0400-1530
03/05/96  1200-1430, 1630-1830
03/06/96  0200-2330
03/07/96  0000-0430, 2030-2130, 2330
03/08/96  0330-1730
03/10/96  0400-1130
03/12/96  0400-1130, 1430-1600
03/13/96  0830-1130
03/15/96  0400-2200
03/16/96  0400-0830, 1030-1200, 1500-1700
03/17/96  0630, 0730-2030
03/18/96  0300-1730
03/19/96  0130-2330
03/20/96  0000-1430, 1700-1830
03/21/96  0230
03/22/96  0400, 1600-1700
03/23/96  0400-1930
03/24/96  2200-2330
03/25/96  0000-1500
03/27/96  1800-2000

The latent and sensible heat fluxes can be recalculated by using only soil
heat flows 1, 2, 3, and 5 to calculate the average soil heat flow,

ave_shf = (g1 + g2 + g3 + g5)/4
e = -(q + ave_shf)/(1 + bowen)
h = -(e + ave_shf + q)

• Soil heat flow 4 (mV)(soil_heat_flow_4_mv)

• Surface soil heat flux 4(surface_soil_heat_flux_4)
• Surface sensible heat flux(sensible_heat_flux)
• Soil heat flow 4, corrected for soil moisture(corr_soil_heat_flow_4)
• Soil heat flow 4(soil_heat_flow_4)
• Surface soil heat flux, average of fluxes 1-5(surface_soil_heat_flux_avg)
• Surface latent heat flux(latent_heat_flux)