Freund, Katharina; Bartsch, Annett (2020): Midwinter thaw events over Greenland derived from Seawinds QuikScat 2000-2008 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.911298
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Scatterometer data acquired in Ku-band from the QuikSCAT satellite have been used to identify midwinter melt events over Greenland. The focus was set on winter months (November-March) 2000 to 2008. Several approaches were examined for their capability of detecting thaw events.
In the first case the change of the backscatter coefficient sigma0 based on a three-day moving window was used. In the second case the difference between two consecutive days was used. Two types of parameterization have been investigated for both cases: a constant threshold of 1.5 dB (Approach I and III) and a location specific noise level (Approach II and IV). Thaw events were detected for all winters, however, the spatially largest extent was found during late November in 2005 in case of all approaches.
The dataset (csv files) includes the results from all four approaches. Grid spacing is 10km (pre-processed based on Bartsch et al. 2007). The following values are provided for each detected event: grid point ID (GP_NAME), latitude, longitude, date, depending on the approach a three day average difference or a day to day difference of sigma0 and if used (Approach II and IV) the location specific noise multiplied by three.
Shape files are provided for the three largest detected events in addition: 26.11.-30.11.2005, 17.11.-21.11.2007 and 01.-04.11.2008. No Data value is -9999. Algorithm details and overview maps are provided in Freund (2017).
Supplement to:
Freund, Katharina (2017): Time series analyses of Ku-band scatterometer data over Greenland for retrieval of spatial and temporal patterns of winter thaw events. Technische Universität Wien, Diplomarbeit, 68 pp, http://katalog.ub.tuwien.ac.at/AC14478682
Related to:
Bartsch, Annett (2010): Ten Years of SeaWinds on QuikSCAT for Snow Applications. Remote Sensing, 2(4), 1142-1156, https://doi.org/10.3390/rs2041142
Bartsch, Annett; Kidd, Richard A; Wagner, Wolfgang; Bartalis, Zoltan (2007): Temporal and spatial variability of the beginning and end of daily spring freeze/thaw cycles derived from scatterometer data. Remote Sensing of Environment, 106(3), 360-374, https://doi.org/10.1016/j.rse.2006.09.004
Coverage:
Median Latitude: 72.938296 * Median Longitude: -42.123755 * South-bound Latitude: 60.027300 * West-bound Longitude: -74.997800 * North-bound Latitude: 83.949300 * East-bound Longitude: -10.152600
Date/Time Start: 2000-01-04T00:00:00 * Date/Time End: 2009-03-31T00:00:00
Event(s):
Greenland_QuickScat * Latitude: 66.000000 * Longitude: -43.000000 * Method/Device: derived from Quick Scatterometer (QuikSCAT)
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
5 datasets
Download Data
Datasets listed in this publication series
- Freund, K; Bartsch, A (2020): Three largest midwinter thaw events over Greenland derived from Seawinds QuikScat 2000-2008 - Shape files. https://doi.org/10.1594/PANGAEA.911299
- Freund, K; Bartsch, A (2020): Approach I - three day moving average and constant threshold. https://doi.org/10.1594/PANGAEA.911292
- Freund, K; Bartsch, A (2020): Approach II - three day moving average and noise dependent threshold. https://doi.org/10.1594/PANGAEA.911294
- Freund, K; Bartsch, A (2020): Approach III - day to day difference and constant threshold. https://doi.org/10.1594/PANGAEA.911296
- Freund, K; Bartsch, A (2020): Approach IV - day to day difference and noise dependent threshold. https://doi.org/10.1594/PANGAEA.911297