RESTRICTED only accessable in CEN/MPI network or via CliSAP login What does that mean?
Data access via file system: /data/icdc/ice_and_snow/arctic_lead_fraction_amsre
Coverage, spatial and temporal resolution
Period and temporal resolution:
- November 1, 2002, to April 30, 2011
- Daily for freezing season: November 1 to April 30
Coverage and spatial resolution:
- Northern hemisphere
- Spatial resolution: 6.25 km x 6.25 km, polar-stereographic grid from NSIDC, tangential plane at 70°N and 70°S, respectively
- Geographic longitude: -180°E to 180°E
- Geographic latitude: from about 41°N to 90°N, in the corners of the grid further equatorward
- Dimension: 1216 columns x 1792 rows
- Altitude: 0.0 m
The data set does not yet contain uncertainty estimates.
A number of comparisons with independent data (Envisat ASAR, MODIS, Cryosat-2) has been carried out. These show that about 50% of the leads present in MODIS imagery (500 m grid resolution) can be identified with the approach used here (6.25 km grid resolution). The minimum width down to which leads can be identified is about 3 km. Note that the leads need to be dominantly covered by thin ice; if too much open water is present the approach provides a less reliable result.
Because of the size of the searching window the approach cannot generally applied to identify larger thin ice areas or polynyas.
More details are found in the references.
Alfred Wegener Institute for Polar and Marine Research / Bremerhaven
email: lars.kaleschke (at) awi.de
ICDC / CEN / University of Hamburg
email: stefan.kern (at) uni-hamburg.de
Please cite as
"AMSR-E lead area fraction for the Arctic, [PERIOD], Integrated Climate Date Center (ICDC, icdc.cen.uni-hamburg.de/), University of Hamburg, Hamburg, Germany, [Month, Year]"
and the main publications Roehrs and Kaleschke (2012) and Roehrs et al. (2012) when using this data.