SGP/EBBR - EBBR E19 Changeout, Data Missing/Incorrect

During changeout of the EBBR system at E19, data was missing for the
time period, except for 1815-1830 GMT, when the data was incorrect.

• bottom vapor pressure(vp_bot)
• Time offset of tweaks from base_time(time_offset)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• Dummy altitude for Zeb(alt)
• top air temperature(tair_top)
• base time(base_time)
• lon(lon)
• Temperature of the top humidity chamber(thum_top)
• net radiation(q)
• Home signal(home)
• Temperature of bottom humidity sensor chamber(thum_bot)
• Bottom humidity(hum_bot)
• bottom air temperature(tair_bot)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• Retrieved pressure profile(pres)
• scalar wind speed(wind_s)
• top vapor pressure(vp_top)
• Top humidity(hum_top)
• lat(lat)
• Reference Thermistor Temperature(tref)

• lat(lat)
• Right air temperature(tair_r)
• Reference temperature(rr_tref)
• Soil temperature 5(rr_ts5)
• scalar wind speed(wind_s)
• Soil temperature 4(rr_ts4)
• Wind direction (relative to true north)(mv_wind_d)
• Soil moisture 1(r_sm1)
• Home signal(mv_home)
• Soil moisture 3(r_sm3)
• Soil moisture 2(r_sm2)
• Soil heat flow 1(mv_hft1)
• Soil heat flow 2(mv_hft2)
• Left air temperature(tair_l)
• Left relative humidity(mv_hum_l)
• Battery(bat)
• Soil heat flow 4(mv_hft4)
• Right relative humidity(mv_hum_r)
• Soil heat flow 5(mv_hft5)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Soil moisture 4(r_sm4)
• Soil heat flow 3(mv_hft3)
• Soil temperature 1(rr_ts1)
• Soil temperature 2(rr_ts2)
• Time offset of tweaks from base_time(time_offset)
• lon(lon)
• Soil moisture 5(r_sm5)
• Signature(signature)
• Dummy altitude for Zeb(alt)
• Soil temperature 3(rr_ts3)
• base time(base_time)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Atmospheric pressure(mv_pres)
• Net radiation(mv_q)

• 0-5 cm integrated soil temperature, site 3(ts3)
• vector wind speed(res_ws)
• Dummy altitude for Zeb(alt)
• 5 cm soil heat flow, site 1(shf1)
• soil heat flow, site 2(g2)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• soil heat flow, site 1(g1)
• 5 cm soil heat flow, site 4(shf4)
• net radiation(q)
• Exchange mechanism position indicator (0 to 15 min)(home_15)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• Reference Thermistor Temperature(tref)
• volumetric soil moisture, site 3(sm3)
• 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
• 5 cm soil heat flow, site 5(shf5)
• average surface soil heat flow(ave_shf)
• top vapor pressure(vp_top)
• volumetric soil moisture, site 4(sm4)
• Soil heat capacity 3(cs3)
• 0-5 cm change in soil heat storage with time, site 2(ces2)
• lon(lon)
• Retrieved pressure profile(pres)
• Soil heat capacity 5(cs5)
• Temperature of the top humidity chamber(thum_top)
• 0-5 cm change in soil heat storage with time, site 3(ces3)
• 5 cm soil heat flow, site 2(shf2)
• 0-5 cm integrated soil temperature, site 4(ts4)
• base time(base_time)
• Soil heat capacity 2(cs2)
• 0-5 cm integrated soil temperature, site 2(ts2)
• 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
• soil heat flow, site 4(g4)
• 0-5 cm integrated soil temperature, site 2(ts1)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• volumetric soil moisture, site 2(sm2)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
• Time offset of tweaks from base_time(time_offset)
• Soil heat capacity 1(cs1)
• 0-5 cm change in soil heat storage with time, site 4(ces4)
• 0-5 cm integrated soil temperature, site 5(ts5)
• latent heat flux(e)
• 0-5 cm change in soil heat storage with time, site 2(ces1)
• Soil heat capacity 4(cs4)
• h(h)
• bottom vapor pressure(vp_bot)
• wind direction (relative to true north)(wind_d)
• soil heat flow, site 3(g3)
• Temperature of bottom humidity sensor chamber(thum_bot)
• Top humidity(hum_top)
• volumetric soil moisture, site 5(sm5)
• Bottom humidity(hum_bot)
• lat(lat)
• soil heat flow, site 5(g5)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• 5 cm soil heat flow, site 3(shf3)
• scalar wind speed(wind_s)
• top air temperature(tair_top)
• bottom air temperature(tair_bot)
• volumetric soil moisture, site 1(sm1)
• 0-5 cm change in soil heat storage with time, site 5(ces5)

SGP/EBBR - EBBR E19 Wind Speed Incorrect

The anemometer cups were frozen stalled during the period.

The following values were therefore incorrect:

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws

• vector wind speed(res_ws)
• scalar wind speed(wind_s)

• scalar wind speed(wind_s)

• scalar wind speed(wind_s)
• vector wind speed(res_ws)

SGP/EBBR - EBBR E19 Net Radiation Incorrect

The net radiometer top dome was broken and water had entered.  Net 
radiation values are therefore incorrect during the period.

The affected data are:

5 minute:  q
15 minute: mv_q
30 minute: q, h, e

• net radiation(q)

• Net radiation(mv_q)

• latent heat flux(e)
• h(h)
• net radiation(q)

SGP/EBBR/E19 - Reprocess: E19 EBBR Soil heat Flow Probe #5 Upsidedown

Soil heat flow probe #5 was installed upsidedown at the initial
installation of the EBBR system.  The data from it had the wrong sign.
Site operations personnel reversed its orientation in the soil on August
14, 1997, thereby correcting the problem.

Values affected (and thus incorrect) include:

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

The latent and sensible heat fluxes can be recalculated by reversing the
sign of cshf5, adding it to ces5 and recomputing the average soil heat flow,

ave_shf = (g1 + g2 + g3 + g4 + g5)/5

e = -(q + ave_shf)/(1 + bowen)

h = -(e + ave_shf + q).

• Soil heat flow 5(mv_hft5)

• latent heat flux(e)
• 5 cm soil heat flow, site 5(shf5)
• soil heat flow, site 5(g5)
• average surface soil heat flow(ave_shf)
• h(h)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)

SGP/EBBR/E19 - Battery Voltage Drop

EBBR battery voltage at E19, El Reno, OK declined to lower than acceptable
levels after long periods of clouds after initial installation.  The low
voltage condition worsened as Autumn progressed.  In November 1997 the
battery tested okay, but would not hold sufficient capacity at night or
during extended periods of clouds to keep the voltage high enough for the
EBBR to work properly.  At my request, the battery was replaced with a brand
new battery on 31 December 1997.  The new battery is presently maintaining
voltage level at night.

The voltage dropped to 10 volts or less many days before the battery change.
Voltages less than 10.3 volts affected a wide range of measured values, but
at different times.  When the voltage was much below 10 volts the home
signal became very large (several volts), a quirk of the AEM circuitry.
At various times, latent and sensible heat fluxes, soil temperature, air
temperature, relative humidity, vapor pressure, wind direction, soil heat
flux plate output, home signal, and atmospheric pressure (at least) were not
reported correctly by the CR10 datalogger.  At least the sensible and latent
heat fluxes should be considered to be incorrect when the battery voltage is
less than 10.3 volts.  The battery voltage is found in the 15 minute data.

• Bottom humidity(hum_bot)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• top air temperature(tair_top)
• Retrieved pressure profile(pres)
• Temperature of the top humidity chamber(thum_top)
• top vapor pressure(vp_top)
• Top humidity(hum_top)
• Home signal(home)
• Temperature of bottom humidity sensor chamber(thum_bot)

• Battery(bat)
• Right relative humidity(mv_hum_r)
• Right air temperature(tair_r)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Soil temperature 1(rr_ts1)
• Soil temperature 5(rr_ts5)
• Soil temperature 2(rr_ts2)
• Soil temperature 4(rr_ts4)
• Wind direction (relative to true north)(mv_wind_d)
• Soil temperature 3(rr_ts3)
• Home signal(mv_home)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Atmospheric pressure(mv_pres)
• Left air temperature(tair_l)
• Left relative humidity(mv_hum_l)

• 0-5 cm integrated soil temperature, site 3(ts3)
• vector wind speed(res_ws)
• 0-5 cm integrated soil temperature, site 5(ts5)
• latent heat flux(e)
• h(h)
• bottom vapor pressure(vp_bot)
• wind direction (relative to true north)(wind_d)
• 5 cm soil heat flow, site 1(shf1)
• Temperature of bottom humidity sensor chamber(thum_bot)
• 5 cm soil heat flow, site 4(shf4)
• Top humidity(hum_top)
• Exchange mechanism position indicator (0 to 15 min)(home_15)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• Bottom humidity(hum_bot)
• 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
• 5 cm soil heat flow, site 5(shf5)
• top vapor pressure(vp_top)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• 5 cm soil heat flow, site 3(shf3)
• Retrieved pressure profile(pres)
• Temperature of the top humidity chamber(thum_top)
• top air temperature(tair_top)
• 5 cm soil heat flow, site 2(shf2)
• 0-5 cm integrated soil temperature, site 4(ts4)
• 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
• 0-5 cm integrated soil temperature, site 2(ts2)
• 0-5 cm integrated soil temperature, site 2(ts1)
• bottom air temperature(tair_bot)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)

SGP/EBBR/E19 - 3-Month Check

During EBBR 3 month checks the Automatic Exchange Mechanism is disabled
(reflected by home signals near zero) so that the two aspirator units can be
placed at the same height.  The measurements during these periods 
do not produce correct outputs of bowen ratio (bowen), sensible heat flux
(h), or latent heat flux (e), nor do the air temperature and relative 
humidity measurements indicate correct gradients.  Checks performed before 
or after the AEM is disabled also lead to some incorrect data.  Incorrect 5,
15 minute and half hour data occurs for the period indicated.

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

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

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

SGP/EBBR/E19 - Six-Month Checks

During EBBR 6 month checks (formally called 3 month checks) the Automatic 
Exchange Mechanism is disabled (reflected by home signals near zero) so that
the two aspirator units can be placed at the same height.  The measurements
during these periods do not produce correct outputs of bowen ratio (bowen), 
sensible heat flux (h), or latent heat flux (e), nor do the air temperature
and relative humidity measurements indicate correct gradients.  Checks 
performed just before or after the AEM is disabled also lead to some 
incorrect data.  Incorrect 5, 15 minute and half hour data occurs for the 
period indicated.

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

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

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

SGP/EBBR/E19 - Wind Direction Data Incorrect (revised)

The wind direction sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  res_ws, wind_d, sigma_wd
15 minute: mv_wind_d
30 minute: res_ws, wind_d, sigma_wd

• null(Raw data stream - documentation not supported)

• 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)

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

SGP/EBBR/E19 - Wind Speed Data Incorrect

The wind speed sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws,

• null(Raw data stream - documentation not supported)

• vector wind speed(res_ws)
• scalar wind speed(wind_s)

• scalar wind speed(wind_s)

• scalar wind speed(wind_s)
• vector wind speed(res_ws)

SGP/EBBR/E19 - Wind Speed Data Incorrect

The wind speed sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws,

• null(Raw data stream - documentation not supported)

• vector wind speed(res_ws)
• scalar wind speed(wind_s)

• scalar wind speed(wind_s)

• scalar wind speed(wind_s)
• vector wind speed(res_ws)

SGP/EBBR/E19 - Net Radiation Incorrect

Water in the net radiometer dome made the net radiation data incorrect.
Comparison with surrounding EBBR sites should allow for an approximate
correction of the net radiation data.

• net radiation(q)

• Net radiation(mv_q)

• net radiation(q)

SGP/EBBR/E19 - Incorrect Tref, Tair Data, Bowen Ratio, latent and sensible heat fluxes

All Tref and Tair temperatures, plus bowen ratio, latent heat flux,
and sensible heat flux values are incorrect for this period.  This problem
was caused by mistakenly removing the Tref sensor.

• top air temperature(tair_top)
• Reference Thermistor Temperature(tref)
• bottom air temperature(tair_bot)

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

• latent heat flux(e)
• top air temperature(tair_top)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Reference Thermistor Temperature(tref)

SGP/EBBR/E19 - Temperature of Left Humidity Probe Incorrect

A poorly seated lead caused the temperature reading from the left humidity
probe to be incorrect. This also affects the calculated vapor pressures,the
Bowen ratio, and the sensible and latent heat fluxes.

The affected values are:

5 minute:  thum_top, thum_bot, vp_top, vp_bot
15 minute: rr_thum_l
30 minute: thum_top, thum_bot, vp_top, vp_bot, bowen, e, h

• top vapor pressure(vp_top)
• bottom vapor pressure(vp_bot)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• Temperature of left humidity sensor chamber(rr_thum_l)

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