Paul, Stephan; Willmes, Sascha; Heinemann, Günther (2015): Daily MODIS composites of thin-ice thickness and ice-surface temperatures for the Southern Weddell Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.848612, Supplement to: Paul, S et al. (2015): Long-term coastal-polynya dynamics in the Southern Weddell Sea from MODIS thermal-infrared imagery. The Cryosphere, 9(6), 2027-2041, https://doi.org/10.5194/tc-9-2027-2015
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Based upon high-resolution thermal-infrared Moderate-Resolution Imaging Spectroradiometer (MODIS) satellite imagery in combination with ERA-Interim atmospheric reanalysis data, we derived long-term polynya parameters such as polynya area, thin-ice thickness distribution and ice-production rates from daily cloud-cover corrected thin-ice thickness composites. Our study is based on a thirteen year investigation period (2002-2014) for the austral winter (1 April to 30 September) in the Antarctic Southern Weddell Sea. The focus lies on coastal polynyas which are important hot spots for new-ice formation, bottom-water formation and heat/moisture release into the atmosphere. MODIS has the capability to resolve even very narrow coastal polynyas. Its major disadvantage is the sensor limitation due to cloud cover. We make use of a newly developed and adapted spatial feature reconstruction scheme to account for cloud-covered areas. We find the sea-ice areas in front of Ronne and Brunt Ice Shelf to be the most active with an annual average polynya area of 3018 ± 1298 and 3516 ± 1420 km2 as well as an accumulated volume ice production of 31 ± 13 and 31 ± 12 km**3, respectively. For the remaining four regions, estimates amount to 421 ± 294 km**2 and 4 ± 3 km**3 (Antarctic Peninsula), 1148 ± 432 km**2 and 12 ± 5 km**3 (Iceberg A23A), 901 ± 703 km**2 and 10 ± 8 km**3 (Filchner Ice Shelf) as well as 499 ± 277 km**2 and 5 ± 2 km**3 (Coats Land). Our findings are discussed in comparison to recent studies based on coupled sea-ice/ocean models and passive-microwave satellite imagery, each investigating different parts of the Southern Weddell Sea.
Median Latitude: -73.500000 * Median Longitude: -42.500000 * South-bound Latitude: -78.000000 * West-bound Longitude: -65.000000 * North-bound Latitude: -69.000000 * East-bound Longitude: -20.000000
This data set contains daily MODIS composites from April to September for the time interval from 2002 to 2014. Thin-ice thickness data up to 0.2m are derived from the MOD/MYD29 ice-surface temperature product of the National Snow and Ice Data Center (NSIDC) using a simple surface-energy-balance and thermodynamic sea-ice model. This data is corrected for influence of cloud cover and available for the complete coast line of the Southern Weddell Sea. For details on the procedures, please consult the given reference. This study was funded by the Deutsche Forschungs Gemeinschaft in the framework of the priority program SPP1158 "Antarctic Research with comparative investigations in Arctic ice areas" by grant HE2740/12.
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