GEM-2 quicklook total thickness measurements from the 2019-2020 MOSAiC expedition
Hendricks, Stefan; Itkin, Polona; Ricker, Robert; Webster, Melinda; von Albedyll, Luisa; Rohde, Jan; Raphael, Ian; Jaggi, Matthias; Arndt, Stefanie
Hendricks, Stefan; Itkin, Polona; Ricker, Robert; Webster, Melinda; von Albedyll, Luisa; Rohde, Jan; Raphael, Ian; Jaggi, Matthias; Arndt, Stefanie (2022): GEM-2 quicklook total thickness measurements from the 2019-2020 MOSAiC expedition [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.943666

ELEVATION START: -4356.9 m
ELEVATION END: -4357.2 m
O2A Registry URI https://registry.o2a-data.de/items/3716
CAMPAIGN: PS122/1 (MOSAiC20192020)
BASIS: Polarstern
METHOD/DEVICE: Broadband electromagnetic sensor (BES)
COMMENT: Transect Survey 2019-10-24

Start of Event: PS122/1_4-2
ELEVATION START: -4356.9 m
O2A Registry URI https://registry.o2a-data.de/items/3716
CAMPAIGN: PS122/1 (MOSAiC20192020)
BASIS: Polarstern
METHOD/DEVICE: Broadband electromagnetic sensor (BES)
COMMENT: Transect Survey 2019-10-24

End of Event: PS122/1_4-2
ELEVATION END: -4357.2 m
O2A Registry URI https://registry.o2a-data.de/items/3716
CAMPAIGN: PS122/1 (MOSAiC20192020)
BASIS: Polarstern
METHOD/DEVICE: Broadband electromagnetic sensor (BES)
COMMENT: Transect Survey 2019-10-24

ELEVATION START: -4357.1 m
ELEVATION END: -4357.0 m
COMMENT: Transect Calibration 2019-10-24

Start of Event: PS122/1_4-3
COMMENT: Transect Calibration 2019-10-24

End of Event: PS122/1_4-3
COMMENT: Transect Calibration 2019-10-24

ELEVATION: -4394.4 m
COMMENT: Transect survey (both loops) 2019-10-31

Start of Event: PS122/1_5-26

End of Event: PS122/1_5-26

COMMENT: Transect - Survey 20191107

COMMENT: Transect calibration 2019/11/07

COMMENT: Transect survey 2019/11/14

COMMENT: Calibration after transect

COMMENT: first out of two calibration over thinner ice

COMMENT: Second out of two calibration over thicker ice

COMMENT: transect id: 20191205; Break in between two transect loops

LOCATION: Arctic Ocean

COMMENT: One time transect of the Snow1

ELEVATION: -4415.6 m

COMMENT: some short stuff and recon towards KD landing site

COMMENT: runway recon

COMMENT: Alli's ridge

COMMENT: ridge transect 20200305

COMMENT: SLoop 20200305

COMMENT: NLoop 20200305

COMMENT: Calibration 20200305

COMMENT: 20200320 NLoop aborted due to floe break up - drift measurement and calibration missing

COMMENT: NLoop: 20200326

COMMENT: Lead survey for Polarstern parking position

COMMENT: 20200326 calibration

COMMENT: 20200403: NLoop

COMMENT: 20200403: RS Site Transect

COMMENT: 20200403: Calibration

COMMENT: 20200410: Alli's ridge (left, center, right)

COMMENT: 20200410: David's ridge

COMMENT: 20200416: calibration

COMMENT: 20200424: Eco ridge

COMMENT: 20200426: SLoop

COMMENT: 20200430: RS site transect

COMMENT: "Gridded 150x200m magna & gem transect at ice station ~30nm south of CO. Stopped due to ice pressure, opportunistic measurements; Transect started; Transect end"

COMMENT: "Alli's Ridge Transects; Started center transect; Ended center transect; Started right transect; Ended right transect; Started left transect; Ended left transect"

COMMENT: "GEM556 Calibration; Started calibration; Ended calibration"

COMMENT: "GEM and Magna transect along first part of new transect loop, from LOG area to Alli's Ridge; Transect start; Transect end"

COMMENT: "Transect to Alli's Ridge from LOG area; Transect start; Transect end"

COMMENT: "'Floe 4' Survey; Transect start; Transect end"

COMMENT: "GEM 556 ladder step calibration; Started calibration; Ended calibration"

COMMENT: "Full transect at new floe; Started transect; Transect ended"

COMMENT: "Transect at new MOSAiC Floe; Began transect; Ended transect"

COMMENT: "Transect at new MOSAiC Floe; Began transect; Transect end"

COMMENT: "Transect at new MOSAiC floe; Began transect; Transect end"

COMMENT: "Transect at new MOSAiC Floe; Transect start; Transect end"

COMMENT: "GEM2 survey along the Leg 4 Transect Loop with stopovers at Lemon Drop and Root Beer Barrel albedo lines. GEM2 measurements were made by Julia Regnery. Melinda was on Magnaprobe, Harold took notes, Delphin bear-guarded. Conditions were breezy, slightly misty, and fun; Began transect; Ended transect"

COMMENT: "GEM transect at new MOSAiC Floe; Began transect; Ended transect"

COMMENT: "Transect at new MOSAiC Floe; Ended transect; Transect begin"

COMMENT: "Transects at Alli's Ridge for ridge consolidation; Transect start; Transect end"

COMMENT: "GEM Calibration; Began calibration; Ended calibration"

COMMENT: "Alli's ridge 20200713_02; Began transects; Ended transects"

COMMENT: Transect part I up to Alli's ridge

COMMENT: comparison to thickness measurements from drilled holes

COMMENT: GEM, Magna-Probe, Ariel, from Polarstern towards Alli's ridge

COMMENT: "GEM 512 calibration; Calibration ended; Started calibration"

ELEVATION: -2802.8 m
COMMENT: "Three mass balance transects at Alli's Ridge; Began transects; Ended transects"

COMMENT: "Mass balance transects at ROV optics grid; Began transect; Ended transect"

COMMENT: "at Alli's ridge, the transect was continued with the gem 512; second half see GEM512 PS122/4-48-180"

COMMENT: point measurements for comparison with ARIEL

COMMENT: drill hole transect

COMMENT: with ARIEL, only half of loop + new route crossing floe

COMMENT: 2nd part of transect loop, first part see GEM-556 PS122/4_4-48_61

COMMENT: Survey of Root Beer Barrel albedo line.

COMMENT: Survey of Lemon Drop albedo line.

COMMENT: "Two transects at Alli's Ridge; middle, then right. Couldn't finish the third because of foggy conditions; stopped due to foggy conditions"

COMMENT: First GEM survey on floe 2.0. This line follows the group leader excursion on the floe. ; short measurement for drift correction; GEM measurement starting behind ridge at 1st meeting point for floe layout discussion; end of zig-zag transect crossing MET city location; longer stop at potential ocean city site; at finally selected ocean city MSS site; back close to starting point; stop at ROV site 380m from Polarstern. Survey of the ROV area.; end of survey. NOMAD handheld computer stopped working. AT ROV site; starting new survey file at ROV site; at Polarstern, end of survey line (the survey file was only closed at 16:04); drift calibration file for a few seconds; calibration with ladder. The site was close to a melt pond, not ideal. drillings: 133cm, 142cm, 140cm, 140cm ladder calibration, each measurement is one line in the file: ground 16:13:00 24.5cm 16:13:59 49.5cm 16:14:38 73.5cm 16:15:13 99cm 16:15:48 122.5cm 16:17:19 147cm 16:17:52 171cm 16:18:25 closed survey file at 18:18:51

COMMENT: GEM2 512 calibration

COMMENT: Transect of the port side of the Ship and therefore not on the main floe.

COMMENT: GEM2 Transect on the main floe.

COMMENT: Transect through the ridge in front of Polarstern.

COMMENT: GEM2 Transect Off-site starboard side at 3 o'clock from ship. (not on the main floe/CO)

COMMENT: Ridge survey.

COMMENT: GEM2 survey over the Remote Sensing transect and the Kinder-Grid.; Drift measurement before transect start. ; Drift measurement before transect end. ; GEM2 survey over Remote Sensing transect start.; GEM2 survey over Remote Sensing transect end. ; GEM2 survey over Kinder-grid start.; GEM2 survey over Kinder-Grid end. ; Drift measurement after transect start. ; Drift measurement after transect end.

COMMENT: calibration record file: 76-d-03Se-0f0_GEM.gbf

COMMENT: GEM2 transect on the port side of Polarstern (main floe/CO is on starboard side) - drift recording before profile: 77-d-03Se-0e1_GEM.gbf - survey file: 78-d-03Se-0fc_GEM.gbf - drift recording after profile: 80-d-03Se-13f_GEM.gbf

COMMENT: GEM2 transect of the Remote Sensing transect, Kinder Grid, and Radar Transect. Drift correction file: 91 (no second file at the end) RS transect file: 92 Kinder Grid file: 93 Radar transect file: 94 line 1 of radar transect is line 0 in GEM data. line 2 of radar transect is line 1 in GEM data. line 3 of radar transect is line 2 in GEM data.; start drift measurement. ; drift measurement end. ; start Remote Sensind transect. ; Remote Sensing Transect end; Kinder Grid start; Kinder Grid End; Radar Transect start; Radar Transect end.

COMMENT: GEM2 transect of the portside of the Ship. Drift file before transect: 95 Survey file: 96 Drift file after survey: 97; drift measurement start; drift measurement end. ; Survey start. ; Survey end. ; drift measurement start. ; Drift measurement end.

COMMENT: Kinder grid survey, ARIEL survey (RS transect), and KuKa band radar survey (Radar transect). file 85-d-07Se-05a_GEM: drift before radar transect file 86-d-07Se-0e1_GEM: radar transect file 87-d-07Se-201_GEM : RS transect file 88-d-07Se-104_GEM: Kinder Grid; drift start; drift end; radar transect start; radar transect end; RS Transect start.; RS Transect End.; Kinder Grid start; Kinder Grid end.

COMMENT: Off-site, 12:00 to 2:00 of Polarstern, beyond ROV site. File 89-d-09Se-090_GEM: survey logger froze during survey file 90-d-09Se-104_GEM: second part of survey; Survey start; survey end.

COMMENT: GEM2 survey on the Remote Sensing Transect. File 104: Drift before survey File 105: survey no drift after survey (polar bear in CO).

COMMENT: GEM2 calibration, done near ROV Site. Heigth is measured from underside ski to top of snow. in YAML file the snow thickness is added to the five ice thickness measurements.

COMMENT: Radar Transect.

COMMENT: GEM2 calibration on the Remote Sensing site shortly before leaving the floe.

COMMENT: GEM2 survey on the Remote Sensing Site after deinstallation of the remote sensing instruments.

COMMENT: GEM2 ridge survey. File 110-d-18Se-090_GEM.gbf: drift file 111-d-18Se-0a0_GEM.gbf: survey file 113-d-18Se-120_GEM.gbf: drift

COMMENT: GEM2 transect on Kinder Grid. File 114-d-18Se-17c_GEM.gbf: drift file 115-d-18Se-190_GEM.gbf: survey file 116-d-18Se-06e_GEM.gbf: drift; drift start; drift end; survey start; survey end

COMMENT: MOSAiC Leg 5 - 24. September 2020 Ice Station during transit to Svalbard. two transects were performed: 1: long transect, - gem2 and Magna Probe, - from ship out 3 o'clock, 300m, - afterwards towards front 0.7km out, crossing the bow, then back to port side. - max distance from ship ~1.6km 2: short transect - Ariel Radiometer, Infrared Camera, Flux Sled - form ship out direction 3 o'clock, ~300m File 119-d-24Se-03c_GEM.gbf: Drift before survey file 120-d-24Se-066_GEM.gbf: long survey part one file 121-d-24Se-000_GEM.gbf: long survey part tow after lunchbreak file 122-d-24Se-050_GEM.gbf: short survey file 123-d-24Se-118_GEM.gbf: drift after survey ; drift measurement start; drift measurement end; long transect start; long transect end; short transect start; short transect end; Drift measurement start; Drift measurement end

COMMENT: GEM2 calibration after the long transect and short transect during ice station. File: 124-d-24Se-168_GEM.gbf; calibration start; calibration end

COMMENT: MOSAiC Leg5 - 26. September 2020 Transect during Ice Station two transects were performed: long transect: - GEM2 and Magna Probe across the floe. short transect - Ariel radiometer and Atmos Flux Sled, 3 o'clock away from the ship - GEM2 and Magna Probe along the same track File 125-d-26Se-04e_GEM.gbf: drift before transect file 126-d-26Se-072_GEM.gbf: part one of two of the long transect file 127-d-26Se-157_GEM.gbf: part two of the long transect after lunch break file 128-d-26Se-0e8_GEM.gbf: Drift measurement file 129-d-26Se-100_GEM.gbf: short transect file 130-d-26Se-0a2_GEM.gbf: drift measurement; Drift measurement start; Drift measurement end; long transect start; long transect end; short transect start; short transect end; drift measurement start

COMMENT: MOSAiC Leg 5 - 26. September 2020 GEM2 calibration after transect during ice station. file: 131-d-26Se-0ea_GEM.gbf thickness measurements snow ice freeboard 0.13m 0.45m 0.04m 0.095m 0.455m 0.045m 0.18m 0.43m 0.025m 0.135m 0.62m 0.02m 0.135m 0.44m 0.04m heights from bottom of GEM2 ski to top of snow cover line left right 0 0m 0m 1 0.155m 0.095m 2 0.345m 0.405m 3 0.605m 0.66m 4 0.86m 0.91m 5 1.115m 1.17m 6 1.37m 1.425m 7 1.625m 1.685m; calibration start; calibration end

COMMENT: GEM2 transect during ice station. Two transects were performed: - long transect around the floe - short transect along the transect of the radiomenter Ariel and the Flux Sled. file 132-d-30Se-156_GEM: drift file 133-d-30Se-156_GEM.gbf: survey long transect file 135-d-30Se-273_GEM.gbf: survey short transect file 136-d-30Se-1bc_GEM.gbf: drift; Start Drift measurement; end Drift measurement; Start long transect; end long transect; start short transect; end short transect; start drift measurement; end drift measurement

COMMENT: calibration of GEM2 ; Calibration start; end calibration