Home' Position : Position Feb Mar 2016 Contents upfront
2-4 March 2016: Smart Communities
Summit; Sunshine Coast, QLD.
22-24 March 2016: Australian
Government Data Summit; Canberra,
4-6 April 2016: APAS2016
Association of Public Authority
Surveyors Conference; Leura, NSW.
8-18 April 2016: 1Spatial FME World
Tour; Brisbane, Melbourne, Sydney.
12-14 April 2016: Locate16; Melbourne,
13-14 April 2016: International
Confernece and Exhibition on
Geospatial & Remote Sensing;
2-6 May 2016: FIG Working Week
2016; Christchurch, New Zealand.
16-17 May 2016: International
Symposium on Earth Observation for
One Belt and One Road; Beijing, China.
17-31 May 2016: Directions LIVE;
Melbourne, Adelaide, Perth, Sydney,
Brisbane, Townsville, Canberra. http://bit.
30-31 May 2016: Disaster
and Emergency Management
Conference; Gold Coast, QLD.
1 June 2016: Search and Rescue
Conference; Gold Coast, QLD.
7-8 July: 6th Digital Earth
Summit; Beijing, China.
24-26 July 2016: The 12D
International Users Conference;
Brisbane, QLD. http://bit.ly/1TmZI3A
19 August 2016: Spatial Information
Day; Adelaide, SA. http://bit.ly/1Mwo8SQ
12-16 September 2016: International
Congress for Mine Surveying;
10-14 October 2016: Intelligent
Transport Systems World
Congress; Melbourne, VIC.
28 November-2 December 2016:
Global Spatial Data Infrastructure
Conference; Taipei, Taiwan. http://bit.
2017: International Symposium on
Digital Earth; Sydney, NSW. Details to
Circulation of the Southern Ocean
The above image is just one oblique
snapshot of an impressively detailed
simulation of dense, cold water
at the bottom of the Southern Ocean
created by the ARC Centre of Excellence
for Climate System Science and the
National Computational Infrastructure
(NCI) VizLab. In the top left of the image
the distinctive Antarctic Peninsula is
depicted in white to signify land ice,
while Patagonia and the South American
continental shelf appear in grey on the
right hand side.
In between the two continents, the
surface ocean water we would imagine
to see is missing. This is because the
simulation from which this image is
derived peels back much of the surface
layer of the ocean to explore how
Antarctic bottom water---the coldest,
densest water in the world---behaves
and influences global ocean processes.
To visualise this movement, the water
is categorised into layers of constant
density known as isopycnals. The
isopycnal shown here in blue with
vertical exaggeration has a density of
1037.155 kg/m3. Areas appearing in grey
represent either landmass or areas of the
ocean floor covered with less dense water.
As the legend depicts, this dense water
is under constant movement and eddies
and currents (shown in green and yellow)
are constantly circulating this cold dense
water across the Southern, Pacific and
This simulation was created
using models based on results from
a collaboration of scientists and
engineers in Australia and USA. Ocean
observations such as ocean depth, water
temperature and ocean currents were
incorporated into models by the United
State's NOAA/GFDL, using roughly
5-10km horizontal grid spacing with 50
vertical cells in a column.
For the simulation, computations were
conducted on NCI's Raijin supercomputer
in Canberra, using 9,000 of its 57,472
parallel processing cores. Named after
the Shinto god of Thunder, Raijin is the
most powerful computer in the Southern
Hemisphere and is planned for use in
the daily updates for Australia's next
generation reference frame. Even with
Raijin, it took seven hours to process just
one second of the simulation.
The researchers claim that besides
showcasing the power of detailed
modelling and supercomputing, the
simulation also reveals much about
this little understood part of the world's
influence of the world's oceans and
atmosphere, including ocean ecology,
maritime operations, climate change and
sea level rise. ■
4 position February/March 2016
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