Smedsrud, Lars Henrik; Halvorsen, Mari H; Stroeve, Julienne C; Zhang, Rong; Kloster, Kjell (2016): Fram Strait sea ice export variability over the last 80 years [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.868944, Supplement to: Smedsrud, LH et al. (2017): Fram Strait sea ice export variability and September Arctic sea ice extent over the last 80 years. The Cryosphere, 11(1), 65-79, https://doi.org/10.5194/tc-11-65-2017
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Abstract:
A new long-term data record of Fram Strait sea ice area export from 1935 to 2014 is developed using a combination of satellite radar images and station observations of surface pressure across Fram Strait. This data record shows that the long-term annual mean export is about 880?000 km**2, representing 10 % of the sea-ice-covered area inside the basin. The time series has large interannual and multi-decadal variability but no long-term trend. However, during the last decades, the amount of ice exported has increased, with several years having annual ice exports that exceeded 1 million km**2. This increase is a result of faster southward ice drift speeds due to stronger southward geostrophic winds, largely explained by increasing surface pressure over Greenland. Evaluating the trend onwards from 1979 reveals an increase in annual ice export of about +6 % per decade, with spring and summer showing larger changes in ice export (+11 % per decade) compared to autumn and winter (+2.6 % per decade). Increased ice export during winter will generally result in new ice growth and contributes to thinning inside the Arctic Basin. Increased ice export during summer or spring will, in contrast, contribute directly to open water further north and a reduced summer sea ice extent through the ice?albedo feedback. Relatively low spring and summer export from 1950 to 1970 is thus consistent with a higher mid-September sea ice extent for these years. Our results are not sensitive to long-term change in Fram Strait sea ice concentration. We find a general moderate influence between export anomalies and the following September sea ice extent, explaining 18?% of the variance between 1935 and 2014, but with higher values since 2004.
Coverage:
Median Latitude: 79.000000 * Median Longitude: -5.000000 * South-bound Latitude: 79.000000 * West-bound Longitude: -15.000000 * North-bound Latitude: 79.000000 * East-bound Longitude: 5.000000
Date/Time Start: 1935-01-01T00:00:00 * Date/Time End: 2014-01-01T00:00:00
Event(s):
Fram-Strait_Sea-ice * Latitude Start: 79.000000 * Longitude Start: -15.000000 * Latitude End: 79.000000 * Longitude End: 5.000000 * Location: Fram Strait
Comment:
In this study we rely on a combination of ice drift speeds estimated from Envisat Advanced Synthetic Aperture Radar (ASAR) WideSwath and Radarsat-2 ScanSAR (from 2012) images and monthly mean sea level pressure differences across Fram Strait to construct a long-term data record of FS ice export.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Smedsrud, Lars Henrik | Geocode | ||
| 2 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | January, mean | |
| 3 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | February, mean | |
| 4 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | March, mean | |
| 5 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | April, mean | |
| 6 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | May, mean | |
| 7 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | June, mean | |
| 8 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | July, mean | |
| 9 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | August, mean | |
| 10 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | September, mean | |
| 11 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | October, mean | |
| 12 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | November, mean | |
| 13 | Sea ice area, flux, at given time interval | Ice area flux | 103 km2 | Smedsrud, Lars Henrik | December, mean |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
960 data points