SGP/EBBR/E20 - Wind Direction Stuck at 100 Degrees

The wind direction sensor was stuck at about 100 degrees.  This did
not affect the primary measurements (net radiation, soil heat flow, sensible heat flux, 
latent heat flux).

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

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

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

SGP/EBBR/E20 - AEM Failure

The AEM hung inbetween positions; home signals were zero.

The AEM fuse kept blowing, most likely because of worn
rails or sleeves.  This condition may reoccur.

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

• Right air temperature(tair_r)
• Left air temperature(tair_l)

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

SGP/EBBR/E20 - Soil Heat Flow #3 and Soil Temperature #3 Incorrect

• 0-5 cm change in soil heat storage with time, site 3(ces3)
• 0-5 cm integrated soil temperature, site 3(ts3)
• average surface soil heat flow(ave_shf)
• 5 cm soil heat flow, site 3(shf3)
• latent heat flux(e)
• soil heat flow, site 3(g3)
• h(h)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)

• Soil heat flow 3(mv_hft3)
• Soil temperature 3(rr_ts3)

SGP/EBBR/E20  - All Soil Measurements Incorrect

All soil measurements were incorrect during the replacement of soil heat flow #3 and soil 
temperature #3.

• 5 cm soil heat flow, site 2(shf2)
• soil heat flow, site 1(g1)
• 5 cm soil heat flow, site 3(shf3)
• 0-5 cm change in soil heat storage with time, site 4(ces4)
• 0-5 cm integrated soil temperature, site 2(ts1)
• volumetric soil moisture, site 5(sm5)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
• 0-5 cm change in soil heat storage with time, site 2(ces2)
• 0-5 cm integrated soil temperature, site 2(ts2)
• volumetric soil moisture, site 4(sm4)
• 0-5 cm change in soil heat storage with time, site 5(ces5)
• soil heat flow, site 5(g5)
• latent heat flux(e)
• h(h)
• Soil heat capacity 3(cs3)
• 5 cm soil heat flow, site 5(shf5)
• average surface soil heat flow(ave_shf)
• soil heat flow, site 4(g4)
• 0-5 cm change in soil heat storage with time, site 2(ces1)
• Soil heat capacity 1(cs1)
• soil heat flow, site 2(g2)
• volumetric soil moisture, site 2(sm2)
• Soil heat capacity 4(cs4)
• 5 cm soil heat flow, site 4(shf4)
• 0-5 cm change in soil heat storage with time, site 3(ces3)
• 0-5 cm integrated soil temperature, site 3(ts3)
• volumetric soil moisture, site 3(sm3)
• 5 cm soil heat flow, site 1(shf1)
• 0-5 cm integrated soil temperature, site 4(ts4)
• soil heat flow, site 3(g3)
• 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
• Soil heat capacity 5(cs5)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• 0-5 cm integrated soil temperature, site 5(ts5)
• 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
• Soil heat capacity 2(cs2)
• volumetric soil moisture, site 1(sm1)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)

• Soil heat flow 4(mv_hft4)
• Soil temperature 2(rr_ts2)
• Soil heat flow 5(mv_hft5)
• Soil moisture 3(r_sm3)
• Soil moisture 4(r_sm4)
• Soil moisture 5(r_sm5)
• Soil heat flow 1(mv_hft1)
• Soil heat flow 2(mv_hft2)
• Soil temperature 3(rr_ts3)
• Soil temperature 5(rr_ts5)
• Soil temperature 4(rr_ts4)
• Soil heat flow 3(mv_hft3)
• Soil temperature 1(rr_ts1)
• Soil moisture 2(r_sm2)
• Soil moisture 1(r_sm1)

SGP/EBBR/E20 - 6 Month Checks

Many measurements were incorrect while the AEM was positioned with both aspirators at the 
same height for comparison checks.

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

• Left relative humidity(mv_hum_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Left air temperature(tair_l)
• Right air temperature(tair_r)
• Right relative humidity(mv_hum_r)

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

SGP/EBBR/E20 - Improved EBBR CR10 Program

Effective 20050330.1900, 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).

• average surface soil heat flow(ave_shf)
• latent heat flux(e)
• h(h)

SGP/EBBR/E20 - metadata corrections

On 20050723, a series of metadata corrections and additions were completed.  These 
metadata changes apply to all EBBR.E20 data collected by ARM back to the installation of the 
instrument in April 1993. Please see the current metadata for correct information.  These 
changes do not
affect data values or quality.	

The changes are summarized below:
1) Update of "sensor location" information
2) Addition of installation dates for the systems
3) Correction of soil moisture units (from "by volume" to "gravimetric")

• base time(base_time)

• base time(base_time)

• base time(base_time)