Lutz, Katrina; Tabone, Ilaria; Humbert, Angelika; Braun, Matthias Holger (2024): Rapid drainages of supraglacial lakes in Northeast Greenland from 2016 - 2022 observed through Sentinel-2 imagery [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.973446 (DOI registration in progress)
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Abstract:
Supraglacial lakes form in surface depressions around the periphery of the Greenland Ice Sheet and can undergo rapid drainages in which part or all of the lake meltwater is lost within hours. The factors influencing the triggering of a rapid drainage are poorly understood, but it is known that large local tensile stress precedes the hydrofracturing of ice within the lake. The subsequent ice fracture allows the meltwater to drain from the surface to the glacier bed rock. Here, we documented the rapid drainage occurrences found over two major glaciers in Northeast Greenland (Zachariæ Isstrøm and Nioghalvfjerdsfjorden/79 N Glacier) over the 2016 to 2022 summer melt seasons (June to September) using Sentinel-2 imagery. The lake area within each surface depression was tracked over each melt season and a rapid drainage was identified when the lake area dropped suddenly within a certain number of days. These rapid drainages were manually checked for false positives. Here, the location and timing of the rapid drainages are recorded.
Keyword(s):
Supplement to:
Lutz, Katrina; Tabone, Ilaria; Humbert, Angelika; Braun, Matthias Holger (preprint): Multi-annual patterns of rapidly draining supraglacial lakes in Northeast Greenland. https://doi.org/10.5194/egusphere-2024-3056
Additional metadata:
Lutz, Katrina (2024): Shapefile containing the polygons of surface depressions in Northeast Greenland 2016-2022 [dataset]. SGL_sinks_ID.zip
Funding:
Bavarian State Ministry for Science and Art, grant/award no. IDP M3OCCA: International Doctorate Program "Measuring and Modelling Mountain glaciers and ice caps in a Changing ClimAte" (M³OCCA)
Federal Ministry of Education and Research (BMBF), grant/award no. 03F0855A: Greenland - Ice Sheet/Ocean Interaction (GROCE II): The future of the 79° North Glacier
Coverage:
Median Latitude: 79.193803 * Median Longitude: -24.550943 * South-bound Latitude: 78.351000 * West-bound Longitude: -31.342000 * North-bound Latitude: 81.080000 * East-bound Longitude: -20.618000
Minimum ELEVATION: 41.07 m a.s.l. * Maximum ELEVATION: 1357.02 m a.s.l.
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Date/time start | Date/time start | Lutz, Katrina | of observation | ||
| 2 | Date/time end | Date/time end | Lutz, Katrina | of observation | ||
| 3 | Identification | ID | Lutz, Katrina | Lake ID; ID of the surface depression | ||
| 4 | Lake surface area | Lake area | m2 | Lutz, Katrina | ||
| 5 | LONGITUDE | Longitude | Lutz, Katrina | Geocode – of the central point of the surface depression | ||
| 6 | LATITUDE | Latitude | Lutz, Katrina | Geocode – of the central point of the surface depression | ||
| 7 | ELEVATION | Elevation | m a.s.l. | Lutz, Katrina | Geocode – of the central point of the surface depression according to ArcticDEM | |
| 8 | Number | n | # | Lutz, Katrina | the number of melt seasons out of 7 in which water was present in the surface depression. No value means a lake never formed there in this 7 year period. | |
| 9 | Number | n | # | Lutz, Katrina | the number of melt seasons out of 7 in which the lake within the surface depression rapidly drained. No value means the lake never rapidly drained in this 7 year period. | |
| 10 | Day of the year | DOY | day | Lutz, Katrina | of the year 2016 when the surface depression rapidly drained | |
| 11 | Day of the year | DOY | day | Lutz, Katrina | of the year 2017 when the surface depression rapidly drained | |
| 12 | Day of the year | DOY | day | Lutz, Katrina | of the year 2018 when the surface depression rapidly drained | |
| 13 | Day of the year | DOY | day | Lutz, Katrina | of the year 2019 when the surface depression rapidly drained | |
| 14 | Day of the year | DOY | day | Lutz, Katrina | of the year 2020 when the surface depression rapidly drained | |
| 15 | Day of the year | DOY | day | Lutz, Katrina | of the year 2021 when the surface depression rapidly drained | |
| 16 | Day of the year | DOY | day | Lutz, Katrina | of the year 2022 when the surface depression rapidly drained |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
5603 data points
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