Andrew Yee[_1_]
March 24th 08, 03:39 AM
ESA News
http://www.esa.int
14 March 2008
Earth from Space: Splitting iceberg
Envisat captures the break up of the massive A53A iceberg located just east
of the South Georgia Island (visible at image bottom) in the southern
Atlantic Ocean.
A huge fissure was spotted running south to north through the berg on 1
March by C-CORE, the Canadian ice-tracking service, while studying satellite
images collected from Envisat's Advanced Synthetic Aperture Radar (ASAR)
instrument using the Polar View monitoring programme.
The radar image indicated the berg was unstable and likely to split. Just
days afterwards on 4 March, Envisat's Medium Resolution Imaging Spectrometer
(MERIS) sensor captured the break. Both bergs are estimated to measure
around 30 km in length. As a reference, South Georgia Island is
approximately 180-km long.
The break up of A53A, which calved off the Larsen Ice Shelf in late April
2005, occurred in relatively warm waters, making it highly likely that
numerous smaller icebergs and ice islands will calve off the two icebergs.
Several different processes can cause an iceberg to form, or 'calve',
including deterioration from high temperatures or the sun's radiation,
action from winds and waves or a collision with another iceberg.
Since 2006, ESA has supported Polar View, a satellite remote-sensing
programme funded through the Global Monitoring for Environment and Security
(GMES) Service Element (GSE) that focuses on the Arctic and the Antarctic.
GMES responds to Europe's needs for geo-spatial information services by
bringing together the capacity of Europe to collect and manage data and
information on the environment and civil security, for the benefit of
European citizens.
ASAR is able to produce high-quality images of icebergs and ice sheets and
is capable of differentiating between different types of ice because it is
able to see through clouds and local darkness -- conditions often found in
polar areas.
[NOTE: Images and weblinks supporting this release are available at
http://www.esa.int/esaCP/SEMIZLM5NDF_index_1.html ]
http://www.esa.int
14 March 2008
Earth from Space: Splitting iceberg
Envisat captures the break up of the massive A53A iceberg located just east
of the South Georgia Island (visible at image bottom) in the southern
Atlantic Ocean.
A huge fissure was spotted running south to north through the berg on 1
March by C-CORE, the Canadian ice-tracking service, while studying satellite
images collected from Envisat's Advanced Synthetic Aperture Radar (ASAR)
instrument using the Polar View monitoring programme.
The radar image indicated the berg was unstable and likely to split. Just
days afterwards on 4 March, Envisat's Medium Resolution Imaging Spectrometer
(MERIS) sensor captured the break. Both bergs are estimated to measure
around 30 km in length. As a reference, South Georgia Island is
approximately 180-km long.
The break up of A53A, which calved off the Larsen Ice Shelf in late April
2005, occurred in relatively warm waters, making it highly likely that
numerous smaller icebergs and ice islands will calve off the two icebergs.
Several different processes can cause an iceberg to form, or 'calve',
including deterioration from high temperatures or the sun's radiation,
action from winds and waves or a collision with another iceberg.
Since 2006, ESA has supported Polar View, a satellite remote-sensing
programme funded through the Global Monitoring for Environment and Security
(GMES) Service Element (GSE) that focuses on the Arctic and the Antarctic.
GMES responds to Europe's needs for geo-spatial information services by
bringing together the capacity of Europe to collect and manage data and
information on the environment and civil security, for the benefit of
European citizens.
ASAR is able to produce high-quality images of icebergs and ice sheets and
is capable of differentiating between different types of ice because it is
able to see through clouds and local darkness -- conditions often found in
polar areas.
[NOTE: Images and weblinks supporting this release are available at
http://www.esa.int/esaCP/SEMIZLM5NDF_index_1.html ]