SGP/SIRS/E2 - Ice storm

Data missing due to ice storm.

• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(up_short_hemisp_max)
• Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Maxima(down_short_hemisp_max)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Ventilated Pyranometer,
  Standard Deviation(up_short_hemisp_std)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(down_short_diffuse_hemisp_max)
• Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
  Standard Deviation(up_long_hemisp_std)
• Battery voltage(vBatt)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
• Instantaneous Upwelling Pyrgeometer Dome Thermistor Temperature, Pyrgeometer(inst_up_long_dome_temp)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer(up_long_hemisp)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
  Deviation(down_long_hemisp_shaded_std)
• east longitude for all the input platforms.(lon)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
  Deviation(down_short_hemisp_std)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Ventilated Pyranometer(up_short_hemisp)
• Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
  Pyrgeometer(inst_down_long_shaded_case_temp)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
• Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Ventilated Pyranometer,
  Minima(up_short_hemisp_min)
• Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
  Pyrgeometer(inst_down_long_shaded_dome_temp)
• Instantaneous Upwelling Pyrgeometer Case Thermistor Temperature, Pyrgeometer(inst_up_long_case_temp)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer(down_short_hemisp)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
  Minima(up_long_hemisp_min)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Standard Deviation(down_short_diffuse_hemisp_std)
• altitude above sea levelaltunits(alt)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Minima(down_short_hemisp_min)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Minima(down_short_diffuse_hemisp_min)
• north latitude for all the input platforms.(lat)
• Time offset from base_time(base_time)
• Time offset of tweaks from base_time(time_offset)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer,
  Maxima(up_long_hemisp_max)

• Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
  Pyrgeometer(inst_down_long_shaded_case_resist)
• Time offset of tweaks from base_time(time_offset)
• Time offset from base_time(base_time)
• Instantaneous Upwelling Shortwave Irradiance, Inverted Pyranometer Thermopile
  Voltage(inst_up_short_hemisp)
• Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
  Voltage(inst_direct_normal)
• Instantaneous Upwelling Pyrgeometer Dome Thermistor Resistance, Pyrgeometer(inst_up_long_dome_resist)
• Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)
• Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
  Thermopile Voltage(inst_diffuse)
• Instantaneous Upwelling Pyrgeometer Case Thermistor Resistance, Pyrgeometer(inst_up_long_case_resist)
• Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
  Pyrgeometer(inst_down_long_shaded_dome_resist)
• Instantaneous Upwelling Pyrgeometer Thermopile Voltage, Pyrgeometer(inst_up_long_hemisp_tp)
• Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
  Voltage(inst_global)
• north latitude for all the input platforms.(lat)
• east longitude for all the input platforms.(lon)
• altitude above sea levelaltunits(alt)

SGP/SIRS/E2 - Tracker mis-alignment

The solar tracker was not working correctly at this site from 2/3/2005 to 2/5/2005 
2359GMT.  After this time tracker mounted instruments appear to have been responding correctly.  
There was no maintenance intervention that rectified the tracking problem. This has 
happened in the past with the SGP SciTec trackers.

• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Maxima(down_short_diffuse_hemisp_max)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Minima(down_short_hemisp_min)
• Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Maxima(down_short_hemisp_max)
• Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Minima(down_short_diffuse_hemisp_min)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
• Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
  Standard Deviation(down_short_diffuse_hemisp_std)

• Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
  Voltage(inst_direct_normal)
• Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
  Thermopile Voltage(inst_diffuse)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

SGP/EBBR/E2  - Wind Speed Frozen Stopped By Ice Storm

An ice storm froze the wind speed sensor to a stopped condition.

The wind speed and residual wind speed measurements are incorrect.

This sensor failure does not affect the sensible and latent heat fluxes.

• scalar wind speed(wind_s)

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

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

SGP/EBBR/E2  - Wind Direction Frozen Stopped By Ice Storm

The wind direction sensor was frozen stopped by ice from a storm.  
The wind direction, sigma_wd, and residual wind speed measurements 
are incorrect.

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

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

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

SGP/EBBR/E2  - Wind Speed Frozen Stopped By Ice

An ice storm froze the wind speed sensor to a stopped condition.

The wind speed and residual wind speed measurements are incorrect.

This sensor failure does not affect the sensible and latent heat fluxes.

• scalar wind speed(wind_s)

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

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

SGP/EBBR/E2  - Wind Direction Frozen Stopped By Ice

The wind direction sensor was frozen stopped by ice from a storm.  
The wind direction, sigma_wd, and residual wind speed measurements 
are incorrect.

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

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

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

SGP/SIRS/E2 - Reprocess: Incorrect DIR calibration coefficients

During the DIR/UIR instrument changeout on 2/10/2005 the new datalogger program contained 
incorrect calibration coefficients for the DIR instrument. Technicians corrected the 
program on 3/10/2005.

Users may wish to attempt to reprocess the data by applying the following method. Note, 
this may result in additional errors due to the averaging of the 20s data.

Use 20s data (available averaged in 60s b1 file) to reconstruct downwelling
IR (DIR) data from the PIR instrument.  Use case and dome temperatures as supplied in 
variables:
   inst_down_long_dome_temp[K]
   inst_down_long_case_temp[K]
Back out thermopile(tp) output in mV from the tp in W/m2 as described:
   tp[mV] = (down_long_netir[W/m2]/WrongK1[W/(m2*uV)])/1000
where WrongK1 is the K1 term applied to the DIR during the DQR period.  Use the following 
coefficients to recreate the dataset following the described method in the SIRS handbook 
Sec 7.1.2 available at http://www.arm.gov/instruments/instrument.php?id=33 

The coefficients to be used are as follows:
   WrongK1 = .2251
   K0 = -26.00
   K1 = .2680
   K2 = 1.056
   K3 = -2.476
   Kr = 7.044E-4

• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
  Deviation(down_long_hemisp_shaded_std)
• Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
  Pyrgeometer(inst_down_long_shaded_case_temp)
• Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
• Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
  Pyrgeometer(inst_down_long_shaded_dome_temp)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
  Pyrgeometer(inst_down_long_shaded_dome_resist)
• Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)
• Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
  Pyrgeometer(inst_down_long_shaded_case_resist)

SGP/EBBR/E2 - Net Radiation Incorrect; Latent and Sensible Heat Fluxes Incorrect

The top dome of the net radiometer was broken and water entered, causing incorrect net 
radiation measurements.  This resulted in incorrect sensible and latent heat fluxes.

• corrected sensible heat flux(h)
• latent heat flux(e)
• specific humidity(q)

• Net radiation(mv_q)

• specific humidity(q)

SGP/EBBR/E2 - metadata corrections

On 20050723, a series of metadata corrections and additions were completed.  These 
metadata changes apply to all EBBR.E2 data collected by ARM back to the installation of the 
instrument in May 1997. 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")

• Time offset from base_time(base_time)

• Time offset from base_time(base_time)

• Time offset from base_time(base_time)

SGP/EBBR/E2 - Sensible and Latent Heat Fluxes Incorrect

The sensible and latent heat fluxes and the gradient measurements were incorrect during 
this period because the AEM did not switch positions properly.

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

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

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

SGP/EBBR/E2 - Wind Speed Sensor Frozen Stopped

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

• scalar wind speed(wind_s)

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

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

SGP/SIRS/E2 - Reprocess: Longwave Calibration error

Modified pyrgeometer calibration procedures were implemented beginning in December 2003.  
These modified procedures introduced a calibration bias in the longwave data.  The 
previous procedures were re-implemented at all sites between December 2005 and February 2006 to 
restore proper calibrations.                                                             
                The data collected while the incorrect procedures were in place are 
being reprocessing to remove the calibration bias.  Note, this also affected standard 
deviation, maximum and minimum data fields.

• Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer(up_long_hemisp)
• Upwelling Longwave Hemispheric Net Infrared(up_long_netir)
• Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)