NGEE Teller Top Notes

Data QA

• https://docs.google.com/spreadsheets/d/1ogCWyAmechT0oiUTxEl3KzThwVwx5LK7cjOV9SVK4oM/edit#gid=0
• August 2021 Summary:
  • Replaced AT/RH in June
  • All other met data looks good
  • Thermal conductivity in pit

Extra Notes

• For data grouping routine there is something off with the pit temperatures... more specifically one set is reported as 'Avg' so I must not have correct headers.
• Just a historical note that the Top snow stand on the lump had been bent over sometime prior to Ken H visit in fall 2020... I sorta think this happened in the winter of 2019-2020 but need to circle back to that to confirm.
  • Ken visit: 10/31/20 @ 19:40 is final data in Snow.dat.

Main

NGEE

Latest

• Met Data QA'd through last visit (9/2018)
• Radiation Data QA'd through last visit (9/2018)
• Partway through processing soil.

Met 2017

• HMP155 August 2017
  • failure looks legit... not a data gap.
• HMP155 Cuts out on 10/25 8:00
  • replaced AT portion with new AT thermistor.
  • DP & RH left NAN
• HMP155 replaced on March 2018 visit
• Rain corrected through most recent download.
• Wind Speed / Direction
  • Propeller replaced 6/28/2017
  • No Rime fall 2017

Met 2018

• Wind
  • all rime conditions corrected for through 3/2018 in QC spreadsheet.
• Rain NAN through snowmelt
• Radiometer leveled and desiccant replaced 6/12/2018
• Radiometer leveled again 9/24/2018
• Tipping bucket leveled 6/12/2018 & 9/24/2018
• AT/RH corrected through 3/30/2018 20:00 after sensor destroyed over winter season.

Radiation 2017

• There is a gap 10/2/2017 0:00 to 10/2/2017 22:00
  • I think this is when we removed the sensor from the field to change the desiccant.
    • as in, the screws were stripped and so we drilled and retapped back in town.

Radiation 2018

• All good through March visit.
  • There is a weird thing in 2018 where the lower SW has values higher than the upper SW. I assume this is due to snow/ frost up top. Perhaps related to how close the snow surface is to the sensor this year resulting in a lower wind speed later in the winter.

Soil 2017

• 2017 heat flux plates prior to fall were being measured on wrong channel.
• 2017-03-12 02:00:00 Upper heat flux plate has a value that isn't ever flipped by the qc program.
• 2017-03-12 02:00:00 Lower heat flux plate has a value that isn't ever flipped by the qc program.
• Easy Perl one liners to accomplish this:

perl -pi -e 's/"2017-03-12 02:00:00",149.2/"2017-03-12 02:00:00",6999.00/g;' $TT_SOIL_DIR/outputs/SoilPit_HeatFlux_Lower.csv
perl -pi -e 's/"2017-03-12 02:00:00",140.8/"2017-03-12 02:00:00",6999.00/g;' $TT_SOIL_DIR/outputs/SoilPit_HeatFlux_Upper.csv

• 2017 Soil pit soil moisture -- all corrected
• 2017 Soil heat flux plates also all corrected
• with Vlad determined only good VATP are 2/5/25/50/60/100
• Soil Temperature: VATP
  • I think I have everything corrected though I don't entirely believe the 100cm probe.
• 8/16/2017 from Lily's field book page 50:
  • VATP was heaved 9.5cm above standing water table. I pushed it back down

Soil 2018

• 2018 soil pit soil moisture -- all corrected through most recent visit (3/2018)

Soil 2021

• I've decided the top site experiences high heat fluxes in spring / summer and it seems likely the output is overranging the measurement thresholds set in the program.

Snow

Snow Depth 2018-2019

• Winter 2021 re-analysis:
  • For tripod depth shifted the start of the season earlier compared to what was originally in archive. Took a look at tipping bucket data and thought snow arrived sooner.

• • I don't know what the shift is on 4/4/19 00:50 (UTC) values go from consistent 148.8cm to 144.5.
    • I think this was somehow related to a station visit. Magnaprobe data ends at top 4/3/19 16:52... tz most likely akstd
  • For end of data set in June 2019, standing water is present so the end of season value isn't zero-ish. Final val is 5.0cm
    • I'm sure I must have knocked some rime ice off or something but pretty odd.
    • to verify the time & place I popped open the 2019 end of winter kmz that I made once upon a time.

Start of Season

• 2018-10-24 16:15

Air temperature is around +1C at this time step. Precipitation falls into the tipping bucket but I think it is slush / snow. The snow depth goes from 0 to 6.3cm over three hours and the readings are erratic with respect to quality number. Albedo is 0.23 during the day on 10/23 and increases to 0.96 on 10/24. Longwave values are within 3 Watts suggesting warm clouds / low cloud cover etc.

Snow 2018

• Snow temperature profile
  • Weird shift (looks like mux wonky 1/22 to 1/28/2018)

Partial Data Downloads

Site Downloads / visits:

• Lily / Bob 6/28/2017
• Lily 8/16/2017
• Lily 8/20/2017
• Bob 6/12/2018

Info for metadata and file level metadata

Instrumentation and Heights

• AT/RH @ 2.2m
  • Vaisala HMP155
  • https://www.campbellsci.com/hmp155a
  • Temperature Range: -80 to +60 Celsius
  • Temperature Accuracy: (0.226 - 0.0028 x temperature)°C (-80° to +20°C)
  • Humidity Range: 0 to 100 % Relative Humidity
  • Humidity Accuracy: ±(1.2 + 0.012 × reading) % RH (at -40° to -20°C); ±(1.0 + 0.008 × reading) % RH (at -20° to +40°C)
• WS/WD @ 4.12m
  • RM Young 01503
  • https://www.campbellsci.com/05103-l
  • Range: 0 to 100 m/s
  • Accuracy: +-0.3m/s
  • Startup threshold: 1.0 m/s
  • Wind Direction measurement band: 0 to 355 degrees
  • Accuracy: +-3 degrees
• Snow Depth @ Tripod
  • Campbell Scientific SR50A
  • https://www.campbellsci.com/sr50a
  • Resolution: 0.25mm
  • Accuracy: +-1.0 cm
• Snow Depth @ Lump
  • Campbell Scientific SR50A
  • https://www.campbellsci.com/sr50a
  • Resolution: 0.25mm
  • Accuracy: +-1.0 cm
• Net Radiation @ 1.5m
  • Kipp & Zonen CNR4
  • https://www.campbellsci.com/cnr4
  • Shortwave Measurement Range- 305 to 2800 nm
  • Shortwave Uncertainty in total daily - < 5% (The uncertainty values are for a 95% confidence level.)
  • Longwave Measurement Range - 4500 to 42,000 nm
  • Longwave Uncertainty in total daily- < 10% (The uncertainty values are for a 95% confidence level.)
• Skin Temperature @ 1.9m:
  • Apogee Instruments SI-111
  • https://www.campbellsci.com/si-111
  • Operating Range: -55 to +80 C
  • Accuracy: ±0.2°C (-10° to +65°C) & ±0.5°C (-40° to +70°C)
  • Field of View: 22° half angle
• Summer Precipitation
  • Texas Instruments TE525MM Metric model
  • https://www.campbellsci.com/te525mm-l
  • Accuracy: 1.0% up to 50 mm/hr
• Soil Moisture
  • Stevens Hydrasense II
  • https://amarillo.nserl.purdue.edu/ceap/metadata/Stevens_Hydra_soil.pdf
  • Range Dielectric Constant: 1 = Air to 78 = Distilled Water
  • Accuracy Dielectric Constant: ±1.5% or 0.2 whichever is greater
  • Soil Moisture Range: Completely Dry to completely saturated
  • Soil Moisture Accuracy: ±0.03 water fraction by volume in typical soil
  • Conductivity Range: 0.01 to 1.5 Siemens per meter
  • Conductivity Accuracy: ±2.0% or 0.005 S/m whichever is greater
  • Temperature Range: -10 to +65 Degrees Celsius
  • Temperature Accuracy: ±0.1 Degrees Celsius
• Soil Heat Flux
  • https://www.campbellsci.com/hfp01
  • Sensitivity: 50 μV W-1 m-2 (nominal)
  • Accuracy: Within -15% to +5% in most common soils (12 hour totals)
• Snow Temperature
  • Thermistor - US Sensor PS302J2
  • https://www.littelfuse.com/~/media/electronics/datasheets/leaded_thermistors/littelfuse_leaded_thermistors_interchangeable_thermistors_standard_precision_ps_datasheet.pdf.pdf
  • Range: -80 to +75 Degrees Celsius
  • Accuracy: ±0.1 Degrees Celsius
• Backup Air Temperature
  • Thermistor - US Sensor PS302J2
  • https://www.littelfuse.com/~/media/electronics/datasheets/leaded_thermistors/littelfuse_leaded_thermistors_interchangeable_thermistors_standard_precision_ps_datasheet.pdf.pdf
  • Range: -80 to +75 Degrees Celsius
  • Accuracy: ±0.1 Degrees Celsius
• Soil Temperature
  • Thermistor - US Sensor PS103J2
  • https://www.littelfuse.com/~/media/electronics/datasheets/leaded_thermistors/littelfuse_leaded_thermistors_interchangeable_thermistors_standard_precision_ps_datasheet.pdf.pdf
  • Range: -80 to +75 Degrees Celsius
  • Accuracy: ±0.1 Degrees Celsius
• Soil thermal conductivity
  • East30 Sensors Thermal Conductivity
  • Thermal Conductivity Accuracy: ±5% (Except at soil temperature range about -1.5 to 0.0 Degrees Celsius)
  • https://www.east30sensors.com/thermalconductivity
  • Temperature Accuracy: ±0.1 Degrees Celsius