Microwave Scanning Radiometer) data is available from multiple sources.
Sea ice concentrations are determined from AMSR-E
data using the ARTIST Sea Ice algorithm (see
http://www.seaice.de/) and the 89 GHz bands.
With some delay, higher quality data are available using ftp from
With some delay, higher quality data are available using ftp from ftp://ftp-projects.zmaw.de/seaice/AMSR-E_ASI_IceConc/
· Hemispheric ice concentration maps (both Southern and Northern) are available at 6250 m resolution while regional ice maps are available at 3125 m resolution.
· The Southern Ocean regional datasets at 3125 m resolution include: AntarcticPeninsula, McMurdo, Neumayer, Polarstern, RossSea, ScotiaSea, WeddellSea. The BWZ area is near the border of the two regions: AntarcticPeninsula and ScotiaSea and therefore both datasets had to be merged.
The following analysis used software from Wimsoft (http://wimsoft.com). More details are provided below.
The following operations were used to create the ice maps:
1. HDF files at 3125 m resolution of the AntarcticPeninsula and ScotiaSea regions were downloaded with the wget utility.
2. HDF datasets of the both regions were remapped to a common linear projection map and converted to byte with a command
wam_remap_lla list.txt E:\Projections\BWZ\bwz_linear_320x300_2nm_land.hdf
3. The remapped datasets were merged (composited) together with a command
wam_composite_2sensors E:\sat\ice\AMSR-E_Bremen\AntarcticPeninsula\bwz_2006\*.hdf E:\sat\ice\AMSR-E_Bremen\ScotiaSea\bwz_2006\*.hdf
4. A a standard grid and land mask was overlaid and the HDF files were converted to PNG with wam_series.
5. Finally, animated GIFs were created for various time periods (July-August for 2004 and 2005) with Babarosa GIF Animator. The animated GIFs are shown above.