SGP/EBBR/E9 - Temperature Portion of T/RH Probe

The Temperature portion of the right T/RH probe indicated too high a 
temperature for nearly 11 months.  I twice placed work requests to have the 
probe replaced, but no spares were available.  Spares recently became 
available and I placed a new work request to have the probe changed.  The 
replacement occurred on 18 June 1997; this fixed the problem.  The main 
results of the high temperatures were probe top and bottom temperatures
(used only for the calculation of vapor pressure) and vapor pressures that 
were too large.  Furthermore, this caused latent heat flux to be reported 
to be too large, and therefore sensible heat flux was reported to be too 
small.  Recalculation of the fluxes using thermocouple temperatures to 
calculate vapor pressure would be quite time consuming and would have to
assume that the thermocouple temperature and probe temperature were nearly 
the same.

The EBBR procedures have been changed to include comparison of the 
thermocouple and probe temperatures to make it easier for the site 
operators to detect this condition.

The data affected (and thus incorrect) includes:

15 minute: rr_thum_r 
30 minute: thum_top, thum_bot, vp_top, vp_bot, e, h, bowen.

• Battery(bat)
• Dummy altitude for Zeb(alt)
• Soil heat flow 3(mv_hft3)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Soil heat flow 4(mv_hft4)
• Soil heat flow 5(mv_hft5)
• lon(lon)
• Soil heat flow 1(mv_hft1)
• Soil heat flow 2(mv_hft2)
• base time(base_time)
• lat(lat)

• bottom vapor pressure(vp_bot)
• latent heat flux(e)
• Temperature of the top humidity chamber(thum_top)
• h(h)
• top vapor pressure(vp_top)
• Temperature of bottom humidity sensor chamber(thum_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)

SGP/EBBR/E9 - Wind Direction Sensor Malfunction

During numerous intermittent times during the period listed, the wind direction
sensor at E9, Ashton, KS malfunctioned, putting out a value of 135.  The
sensor was replaced on 30 September 1997, at 1550 GMT.  All wind direction data
with values of 135 during the period listed should be considered incorrect.
The affected data are:

 5 minute: res_ws, wind_d, sigma_d

15 minute: mv_wind_d

30 minute: res_ws, wind_d, sigma_d

• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• standard deviation of wind direction (sigma theta)(sigma_wd)

• Wind direction (relative to true north)(mv_wind_d)

• vector wind speed(res_ws)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• wind direction (relative to true north)(wind_d)