NGEE Teller Top Notes

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Data QA

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 2016-2017 Lump

Season Starts: 11/3/2016 08:35

  • Winter 2021 re-analysis and discussion:
    • I'm still hung up on the precise start. If you look at the end of season zero offset, it meshes up with a season start of 10/26/16 18:00ish or 10/29/16 11:05ish. But from met and radiation data I think this might be rain / slush that melts but it's enough to smoosh down the vegetation briefly but it springs back up again. So, I guess I'm still going with 11/3 start.
    • Albedo suggests no snow (centered on midnight) 10/26 to 10/28. Temperature on these days is around +2 C. So, precipitation in tipping bucket is probably rain. It looks like a litle snow fell and melted though looking at the std deviation of snow depth and the lack of noise in the snow depth data for a couple hours starting 10/26/16 1:40.
    • albedo on the UTC late day of 10/27 & 10/28 @ 0:00 is back to no snow.
    • 10/29 0:00 0.39 albedo but probably top dome covered in rain/slush/snow as the tipping bucket records a bunch.
    • Net Radiation is also mostly positive over this interval. that changes after 10/31 0:00 where there seems to be clearing skies at night.
    • Then no more real precipitation of note until 11/3 after 8:00 UTC.
    • with respect to the snow depth signal over this say 10/26 to 11/2 0:00 interval it's noisy like exposed ground / the signal reflecting off grass rather than a snow surface. So, roughly I think any snow that fell in this interval melted.
    • After sun is up on 11/2/2016 the albedo is 0.72 so looks like good snow. Value never drops below 0.6 in next several days. So pretty good confidence on that.
    • However, still hard to pin down a start. WIth all that said, 11/2 to 11/4 is still a mess with grass / organics not completely buried. The tipping bucket shows no precip on 11/1 or 11/2 and then 9:00 (UTC) to 14:00 on 11/3 it's tipping. So maybe 11/2 albedo is skewed high by heavy clouds / frost. air temperatures are +2 to +4 C on 11/1 and 11/2 until late in day.
    • So, I guess 11/3/2016 08:35 is official start but there is still ground exposed at the sensor as compared to below the radiometer. And it sort of looks like snow starts at 8:35 then transitions to rain around 15:00. If you go by the highest confidence quality numbers then it looks like snow at 8:35 which melts over the day and then a bit more falls by end of day (as illustrated by the declining standard deviation of snow depth.
    • Then things are just kind of a push as to what is going on. Just minimal snow but likely snow covered until next event of note on 11/16/2016.
      • So, going at the start of the season following whatever the furthest away high confidence Q value snow depths probably wouldn't be the worst way to go.
  • November / December 2016 have data spikes in the high confidence Q values. I'm pretty sure this is due to the failure of the HMP155 air temperature which was the only AT active this first winter.
    • If you look at the Column B snow depth values, which are adjusted for temperature there is a mix of 2 decimal data and lots of decimal data (TT_Lump_2016-2017.ods). The bunch of decimal data is the infilled from Teller Bottom air temperatures (or data logger panel temperature I can't remember at the moment). Anyway, the spikes look to be in the bunches of data where the HMP155 seemed to be working but wasn't actually.
    • I've been seeing this in the spreadsheets periodically an interval in late winter, this time 3/12/17 2:00 to 2:55 where the data came in as text rather than date format. It only shows up scrolling by briefly but something to watch for in final outputs.

Season Ends: 05/15/2017 10:35

Snow Depth 2018-2019 Tripod

  • 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

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