Weather: cloudy, calm, perfect for albedo drone measurements until around 10 am, then some higher clouds before it went foggy in the afternoon.  SSL not frozen. 

Heavy freezing rain started at 16:15. 

Still measuring snow heights with ruler and avalanche probe.

10:30-14:00:  PS149_36-1-snowpit_072

transect at MainTransect, (Michi, Matthias, Ruschle). This starts (zero of tape) where the old transect was 155m, the old extension starts is at 45 m of this updated transect (200 m in original MainTransect), which now went to 100m. Linxin and Gunnar measured 0 100 m with ARIEL. We extended the transect by 25 m, so we get the same coverage as at 2a, 2b, but without the first 155m, because most of it was either gone or ponded. We measured 125 m this time.

SnowImager SSA transect every 5m, see information above. 

Photogrammetry at 0,20,40,80,100, 125 m.

Details:

  • measurements in the footprint of albedo, except when in was in pond, then measured next to pond
  • measurements next to pond: 0,15,50, 75 (little island between ponds), 80 (top of pond island), 85 (little penninsula at the end of pond (see picture on the right))
  • SI turned of by accident, configuration error, changed USB stick and it worked again. Dummy picture AFTER 45 m, but not repetition of 45m. 


13:30-14:00:  PS149_36-1-snowpit_073

transect at Ttransect, (Michi, Matthias, Ruschle). 100m, perpendicular to Main Transect, at around 30m of Updated Main Transect. Measured in the footprint of albedo again, or in the footprint of HS camera (Max). Measurements toward ship side of the tape, photogrammetry to other side of tape

SnowImager SSA 100m transect every 5m, see information above. 

Details:

  • measurements in the footprint of albedo, except when in was in pond, then measured next to pond
  • measurements next to pond: 10,35 (on top of pond), 55,60,75,80,85m
  • Measurements at Hyperspectral image location at -1, 19, 41, 99m. (60, 80m were in pond).

Photogrammetry at 0,20,40,61,90 m.


14:30-16:00:  PS149_36-1-snowpit_074

snowpit at EndOfMainTransect (around 90m of updated transect (240 m of old MainTransectExtended)) (Matthias, Michi, Ruschle)

Measurements:

  •  SnowImager (surface at 3 locations (left, middle right) and  interface at 1 location (middle), but 2 sets of images, for SSA and density (grid)
  • snow height (every 0.3 m along 4.5 m, left and right of actual snowpit)
  • Density, Salinity, dO18
  • Temperature 
  • Sample for microCT of snow, SSA + interface 
  • Salinity and dO18 sample of interface and ice underneath.
  • Photogrammetry for surface roughness of surface


15:30-16:00:   PS149_36-1-snowpit_075

transect at EndOfMainTransect , away from Main transect, relatively close to extended transect (Michi, Matthias, Ruschle, Hannah)

20 m, every m: SSA (without density grid) starting at 0m, last measurement at 20 m. Density (with grid), offset 0.5 m to right of SSA, between the SSA measurements. Hannah measured 0-10m, then Ruschle. SI restarted after 10m, because it was on off (green light not blinking).

Photogrammetry for surface roughness at 0,5,15m.



Cool surface around m16 of transect 075.

Matthias measuring at the little peninsula at 85m of 072.

False bottom through a melt hole around 75m of MainTransect.