Pick of the pics and Climate Change: News and Comments
Let’s Hear a Big Cheer for CryoSat-2
An early result from ESA’s CryoSat-2 mission detects a “scoop”, or drop, near the edge of Antarctica’s Ross Ice Shelf, probably due to melting at the base of the 400-metre thick slab of floating ice. There are also clear indications of the variable thickness of sea ice in the adjacent ocean. The vertical scale appears to be very different over the shelf and over the sea.
No branch of climate physics has been more befuddled by propaganda than the monitoring of the Earth’s cryosphere. Ordinary melting at glacier snouts that has happened every spring for thousands of years is nowadays captured by TV cameras and presented as evidence of runaway global warming. Dutiful journalists report reductions in Arctic sea ice but ignore increases in Antarctic sea ice. And scientists argue about how thick the sea ice is.
Thank goodness that the European Space Agency’s CryoSat-2 satellite is at last commissioning in orbit. Duncan Wingham of University College London, leader of the project, released the Ross Ice Shelf image yesterday at ESA’s Living Planet Symposium in Bergen.
The mission had a difficult history, with the original CryoSat being lost on launch in 2004, and CryoSat-2 going into an incorrect orbit in April of this year. But now we can expect much more accurate radar measurements of ice altitude over land and ice shelves, and of “freeboard” in the case of sea ice, which is a measure of its thickness. Perhaps we’ll soon begin to get the hard facts about “polar melting”. They’re long overdue.
For another take on “polar melting”, see my history of the Greenland ice sheet at http://calderup.wordpress.com/2010/05/06/warming-of-greenland/