Hannula, Henna-Reetta; Pirazzini, Roberta; Brus, David; Arponen, Teijo: UAV-based broadband albedo of Arctic Ocean sea ice surface during MOSAiC leg 5, Aug-Sep 2020 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.974281 (dataset in review)
Abstract:
Broadband surface albedo over Arctic Ocean sea ice was measured using an unmanned aerial vehicle (UAV) system called Spectra during Leg 5 of the MOSAiC expedition in August–September 2020. A series of horizontal transects and vertical profiles were flown at altitudes of approximately 5 m, 10 m, and 30 m on seven separate days between August 29 and September 12. The primary goal of these measurements was to characterize the evolution of surface broadband albedo during the onset of autumn freezing and to investigate the spatial variability of albedo across the heterogeneous Arctic sea ice cover at multiple spatial scales.
This dataset includes broadband downwelling and upwelling shortwave irradiance measurements recorded by upward- and downward-facing pyranometers at 5-second intervals. Both raw data and calibrated radiative flux values are provided. The pyranometers were mounted on three-axis stabilizing gimbals, which also recorded x, y, and z acceleration and inclination at 1-second intervals. Each pyranometer's temperature was logged every 5 seconds. Additionally, detailed UAV attitude and positional data were recorded by the autopilot system at 100–200 millisecond intervals. To supplement positional tracking, a secondary GPS unit mounted on the main body of the Spectra UAV offered redundant measurements of position and velocity.
Data recording began when a custom measurement script was manually initiated and continued until the script was terminated or the system was powered off. Prior to each flight, instruments recorded for at least 30 minutes to allow sensor stabilization and thermal equilibration with the ambient temperature. UAV autopilot logs are available for periods when the UAV was armed.
Metadata for all measurement activities, along with a description of the available data files, is provided in a dedicated Excel spreadsheet. In addition, a summary .txt file compiles information from the various data files. This summary includes indicative classifications of measurement subtypes - such as UAV hovering over approximately the same location, horizontal transect flights, stationary on ice, pre-flight preparations, or landing phases. Quality flags (/) have been added to indicate data values falling outside the physical measurement range. These flags are applied to both raw and calibrated pyranometer irradiance values, pyranometer temperatures, and broadband albedo measurements.
The shortwave irradiance values in the original data files are based on sensitivity coefficients obtained during an outdoor calibration conducted prior to the expedition. In contrast, the accompanying .txt file uses updated sensitivity values derived from a more recent outdoor calibration performed after the expedition.
Related to:
Hannula, Henna-Reetta; Brus, David; Pirazzini, Roberta: Unmanned aerial vehicle RGB-orthomosaics of Arctic Ocean sea ice surface during MOSAiC leg 5, Aug-Sep 2020 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.973995
Hannula, Henna-Reetta; et al. (in prep.): Arctic Sea ice surface albedo during the ice freeze-up season: Observations at different scales.
Hannula, Henna-Reetta; Pirazzini, Roberta; Brus, David (2022): UAV aerial photographs of Arctic Ocean sea ice surface during MOSAiC leg 5, Aug-Sep 2020 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.945980
Documentation:
Project(s):
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AFMOSAiC-1_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS122_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate / MOSAiC
European Space Agency (ESA), grant/award no. 4000139872/22/I-DT-lr: UAV observations of BRDF and albedo over sea ice and snow (UAV-OBASiS)
Finnish Cultural Foundation, grant/award no. 00230092: UAV observations of BRDF and albedo over sea ice and snow
Horizon 2020 (H2020), grant/award no. 101003590: Modelling the Polar regions in a global context (PolarRES)
Horizon 2020 (H2020), grant/award no. 730965: Arctic Research Icebreaker Consortium: A strategy for meeting the needs for marine-based research in the Arctic (ARICE)
Research Council of Finland, grant/award no. 364939: Consistent representation of Antarctic and Arctic snow and sea-ice mass and energy budgets from point to model grid cell scales (IceScales)
Coverage:
Median Latitude: 88.550026 * Median Longitude: 109.939331 * South-bound Latitude: 88.105336 * West-bound Longitude: 101.245389 * North-bound Latitude: 88.770639 * East-bound Longitude: 120.909454
Date/Time Start: 2020-08-29T00:00:00 * Date/Time End: 2020-09-12T00:00:00
Minimum Elevation: -4307.7 m * Maximum Elevation: -4255.7 m
Event(s):
PS122/5_59-478 * Latitude: 88.105336 * Longitude: 109.579424 * Date/Time: 2020-08-29T09:25:00 * Elevation: -4307.7 m * O2A Registry URI: https://registry.o2a-data.de/items/7366 * Location: Arctic Ocean * Campaign: PS122/5 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Unmanned aerial vehicle (UAV)
PS122/5_60-70 * Latitude: 88.339165 * Longitude: 115.003904 * Date/Time: 2020-09-01T04:41:00 * Elevation: -4261.8 m * O2A Registry URI: https://registry.o2a-data.de/items/7366 * Location: Arctic Ocean * Campaign: PS122/5 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Unmanned aerial vehicle (UAV)
PS122/5_60-244 * Latitude: 88.290319 * Longitude: 114.146238 * Date/Time: 2020-08-31T08:58:00 * Elevation: -4276.1 m * O2A Registry URI: https://registry.o2a-data.de/items/7366 * Location: Arctic Ocean * Campaign: PS122/5 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Unmanned aerial vehicle (UAV)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Hannula, Henna-Reetta | |||
| 2 | DATE/TIME | Date/Time | Hannula, Henna-Reetta | Geocode – Date | ||
| 3 | Location | Location | Hannula, Henna-Reetta | Label | ||
| 4 | Location | Location | Hannula, Henna-Reetta | Place | ||
| 5 | Date/Time local | Date/Time local | Hannula, Henna-Reetta | Time, local, start | ||
| 6 | Date/Time local | Date/Time local | Hannula, Henna-Reetta | Time, local, end | ||
| 7 | LATITUDE | Latitude | Hannula, Henna-Reetta | Geocode – start | ||
| 8 | LONGITUDE | Longitude | Hannula, Henna-Reetta | Geocode – start | ||
| 9 | LATITUDE | Latitude | Hannula, Henna-Reetta | Geocode – end | ||
| 10 | LONGITUDE | Longitude | Hannula, Henna-Reetta | Geocode – end | ||
| 11 | Number of satellites | Sat | # | Hannula, Henna-Reetta | gps satellites connected | |
| 12 | Height | Height | Hannula, Henna-Reetta | Flight height (m) | ||
| 13 | Comment | Comment | Hannula, Henna-Reetta | Flight comments | ||
| 14 | Flight number | Flight | Hannula, Henna-Reetta | |||
| 15 | Comment | Comment | Hannula, Henna-Reetta | BatteryNo | ||
| 16 | Text file | TEXT | Hannula, Henna-Reetta | see documentation | CM4 dataframe combined from several input files | |
| 17 | Text file | TEXT | Hannula, Henna-Reetta | see documentation | Data logged from lower (downward looking) CM4 pyranometer, Kipp&Zonen CM4 (Serial n. 140056) | |
| 18 | Text file | TEXT | Hannula, Henna-Reetta | see documentation | Pyranometer's temperature from lower (downward looking) CM4 Pt100 thermistor | |
| 19 | Text file | TEXT | Hannula, Henna-Reetta | see documentation | Data logged from upper (upward looking) CM4 pyranometer, Kipp&Zonen CM4 (Serial n. 140056) | |
| 20 | Text file | TEXT | Hannula, Henna-Reetta | see documentation | Pyranometer's temperature from upper (upward looking) CM4 Pt100 thermistor | |
| 21 | Text file | TEXT | Hannula, Henna-Reetta | see documentation | Acceleration and tilt of the lower (downward looking) gimbal | |
| 22 | Text file | TEXT | Hannula, Henna-Reetta | see documentation | Acceleration and tilt of the upper (upward looking) gimbal | |
| 23 | Text file | TEXT | Hannula, Henna-Reetta | see documentation | Output signal from the renundant Beitian GPS unit installed in the main body of the SPECTRA drone | |
| 24 | Text file | TEXT | Hannula, Henna-Reetta | see documentation | Binary log file from Pixhawk autopilot | |
| 25 | Comment | Comment | Hannula, Henna-Reetta | bin file |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Basic curation (CurationLevelB)
Size:
503 data points