SGP/EBBR/E8 - AEM Not Exchanging

The AEM hung in one position frequently and sometimes for many days during this period

While the AEM was not switching, the sensible and latent heat fluxes and gradient 
measurements were incorrect.

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

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

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

SGP/EBBR/E8 - Flux and Gradient Measurements Suspect

The flux and gradient measurements were often incorrect when the AEM did not function 
properly.  The user needs to inspect the data (particularly the home signals) to determine 
when the AEM was and was not working.

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

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

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

SGP/EBBR/E8 - Wind Speed Sensor Frozen Stopped

Freezing rain froze the wind speed sensor to a stopped condition.

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

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

• scalar wind speed(wind_s)

SGP/EBBR/E8 - Fluxes Incorrect; Left Humidity Near Zero

The left humidity was intermittently incorrect, therefore the sensible and latent heat 
fluxes were also.

• top vapor pressure(vp_top)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• latent heat flux(e)
• Top humidity(hum_top)
• h(h)
• Bottom humidity(hum_bot)
• bottom vapor pressure(vp_bot)

• Bottom humidity(hum_bot)
• bottom vapor pressure(vp_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)

• Left relative humidity(mv_hum_l)

SGP/EBBR/E8 - Sensible and Latent Heat Flux Suspect

The left humidity sensor produced large spikes frequently.  This resulted in incorrect 
measurements of vapor pressure gradient and thus calculations of sensible and latent heat 
flux.

• top vapor pressure(vp_top)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• latent heat flux(e)
• Top humidity(hum_top)
• h(h)
• Bottom humidity(hum_bot)
• bottom vapor pressure(vp_bot)

• Bottom humidity(hum_bot)
• bottom vapor pressure(vp_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)

• Left relative humidity(mv_hum_l)

SGP/EBBR/E8 - Sensible and Latent Heat Fluxes and Net Radiation Incorrect

The net radiometer top dome was broken and water had gotten into it.

Sensible and latent heat fluxes and net radiation were therefore incorrect.

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

• net radiation(q)

• Net radiation(mv_q)

SGP/EBBR/E8 - Failed Temp/RH sensor

The right Temperature-Humidity sensor failed. The measured temperature gradients were 
incorrect and thus the sensible and latent heat fluxes were incorrect for this extended 
period.

The sensor was replaced March 6.

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

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

• Temperature of right humidity sensor chamber(rr_thum_r)

SGP/EBBR/E8 - Wind Direction Incorrect

The wind direction flatlined at times at 135 degrees (an indication of failed electronics) 
and at other times trended correctly with the co-located SMOS but differed from it by 15 
to 100 degrees.

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

• 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)