SGP/EBBR/E22 - AEM Home Signals Too High

The AEM home signals were too large at times during the indicated period;
it has been determined by the vendor that this is usually caused by electrical noise in 
the vicinity. When the 30 minute data shows a home 30 signal of 35 or more, the bowen 
ratio, and sensible and latent heat flux 
measurements are incorrect 

Removing the jumper between 4L and AG on the CR10 and adding a jumper to Multiplexer 2, 
Set 6, between L1 and L2 fixed the problem.  The
vendor intends to make this modification to all EBBR systems as they return
for re-calibration.

• temperature of the top humidity sensor chamber(thum_top)
• latent heat flux(e)
• bottom air temperature(tair_bot)
• top relative humidity(hum_top)
• corrected sensible heat flux(h)
• bottom vapor pressure(vp_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• bottom relative humidity(hum_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• temperature of the bottom humidity sensor chamber(thum_bot)

• bottom vapor pressure(vp_bot)
• temperature of the top humidity sensor chamber(thum_top)
• top vapor pressure(vp_top)
• top relative humidity(hum_top)
• bottom air temperature(tair_bot)
• bottom relative humidity(hum_bot)
• temperature of the bottom humidity sensor chamber(thum_bot)
• top air temperature(tair_top)

• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• bottom relative humidity(hum_bot)
• top vapor pressure(vp_top)
• temperature of the bottom humidity sensor chamber(thum_bot)
• bottom vapor pressure(vp_bot)
• top relative humidity(hum_top)
• latent heat flux(e)
• temperature of the top humidity sensor chamber(thum_top)
• top air temperature(tair_top)
• corrected sensible heat flux(h)

SGP/EBBR/E22 - Improved EBBR CR10 Program

Effective 20050330.1930, the EBBR.E20 CR10 program was revised to improve 
the quality of the primary measurements as follows:
   
1) An RMS procedure is used to determine max and min limits of acceptable
soil heat flow.  This is applied to the individual soil sets.  Measurements
outside the limits are rejected and the measurements within the limits are
used to calculate the average soil heat flow.
   
2) Max and min limits are used to determine incorrect values of net
radiation, sensible heat flux (h), latent heat flux (e), and automatic
exchange mechanism (AEM) signal.  If AEM signal is outside the limits, h 
and e are set to 999s.  If net radiation is outside the limits, h and e are 
set to 999s. If h or e are outside the limits, h and e are set to 999s.
   
Virtually no incorrect soil measurement will affect the primary 
measurements of h and e.
   
By setting h and e to 999s, it can be easily seen that the primary 
variables are incorrect; no other interpretation is possible.
   
Prior to 20050330, the improved CR10 program was NOT in effect.  DQRs have
been submitted for known instances of incorrect soil measurements which
affected the quality of the primary measurements of h and e.
   
Note: the DQR begin date is the begin date of the sgp30ebbrE20.b1 data
stream.  The earlier version of the CR10 program was also used on previous
EBBR datastream names (e.g. sgp30ebbrE20.a1).

• corrected sensible heat flux(h)
• average surface soil heat flow at the surface(ave_shf)
• latent heat flux(e)