NOTE: The image below is NOT sea ice thickness, but ocean topography.
Radar data from the European satellite has been used to make a map of ocean circulation across the Arctic basin.
Cryosat’s primary mission is to measure sea-ice thickness, which has been in sharp decline in recent decades.
But its ability also to map the shape of the sea surface will tell scientists if Arctic currents are changing as a result of winds being allowed to blow more easily on ice-free waters.
“Nobody really knows how the Arctic is going to behave as the ice retreats, but we do anticipate that significant changes will occur,” said Dr Seymour Laxon, a Cryosat science team member from University College London, UK.
“This is just the first data, and it shows we now have the tool to monitor what is happening,” he told BBC News.
…
[Cryosat] carries one of the highest resolution synthetic aperture radars ever put in orbit.
The instrument sends down pulses of microwave energy which bounce off both the top of the Arctic sea-ice and the water in the cracks, or leads, which separate the floes.
By measuring the difference in height between these two surfaces, scientists will be able, using a relatively simple calculation, to work out the overall volume of the marine ice cover in the far north.
WUWT carried the story of the Cryosat launch and testing in several articles:
CryoSat-2 exceeding expectations
From the European Space Agency 070110 Participants at the Living Planet Symposium have been hearing about ESA’s most recently launched mission, CryoSat-2. In orbit for almost three months, the satellite is in excellent health with scientists very encouraged by the … Continue reading →
CryoSat passes first operational tests
From the European Space Agency, it looks like CryoSat-2 is working well. I’m sure we are all looking forward to seeing what the results are. ESA’s ice mission delivers first data 13 April 2010 ESA’s CryoSat-2 has delivered its first … Continue reading →
Successful launch for ESA’s CryoSat-2 ice satellite From the European Space Agency: 8 April 2010 ESA PR 07-2010. Europe’s first mission dedicated to studying the Earth’s ice was launched today from Kazakhstan. From its polar orbit, CryoSat-2 will send back … Continue reading →
Full story about the current data from BBC here
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![arctic_currents4_976_1[1]](http://wattsupwiththat.files.wordpress.com/2010/12/arctic_currents4_976_11.jpg?resize=640%2C530&quality=83)
![_48209615__46390440_cryosat466-1[1]](http://wattsupwiththat.files.wordpress.com/2010/12/48209615__46390440_cryosat466-11.gif?resize=466%2C300)
Alarmist crap. There has been no measurement until the last decade that I am aware of, and there have been several times in the last 100 years where there has been observably less ice (see pics of subs at the north pole).
News from Nunavit today on the CBC. Frobisher Bay is ice free. The Innuit can’t go out hunting over the ice. There is no ice.
Polar bears, being much lighter than Innuit, are having no trouble . They can walk across the memory of arctic ice.
Maybe the new ice age has to do with the cubes in the drinks at the Petrolium Club in Calgary.
There will always be ice in the winter. And it will fill the land-limited bowl. The winds, in terms of blowing ice around or apart, become important during the melt and summer season. I wish the media would get that distinction.
I wonder if they will actually send someone to check if their “relatively simple” calculation is working correctly.
It doesn’t seem like anything relatively simple to me. Neither the ice nor the water is flat, unlike their sweet diagram. Not every low point will be water either.
Still, I suppose the algorithm will be exactly imprecise, which means we can learn something from the anomalies. [ sigh ]
What do you want to bet that they will compare this to some other, older measurement, and decide “it’s worse than we thought”?
Radar pulse has been around for a while (serious use began in WWII). Most radar specialists have this one fairly well understood. I for one, am excited about this and will be following it like a hawk on a rabbit, dry on day-old bread, baby to nipple, fox to the hen house, stud to studette, a woman to a diamond, a snake to the grass, and a redheaded Irish lass to laced coffee on a witch tit cold morning.
Cryosat’s primary mission is to measure sea-ice thickness, which has been in sharp decline in recent decades.
Umm, Psst Guys, There has been zero trend in global sea ice extent in recent decades. This fact is not in dispute. Warmie predictions that the ice would melt were and are an epic fail. Trying to find ice that is “thinner then it was before” is not going to work for you as ya’ll pinned your hopes on extent. Al, and Phil and Keith and Micheal and James and perhaps Dr. Laxon all need to accept that they have a problem.
I understand that the Betty Ford clinic might be considering a new program to rehabilitate scientists who fall of the AGW wagon. I think they are calling it Hockey Stick Addiction Syndrome. Perhaps if Dr. Laxon and friends all go together they can get a group discount. You never know, if it works for Linsay Lohan… oops never mind.
@John McManus: Have you checked a weather map lately?
CryoSat 2 data will forever change our understanding of sea ice, and so the release of new data is an exciting time for those of us (professional and non) who want to know everything we can about sea ice dynamics. For the first time in history we’ll soon be able to get a reasonable measurement of actual arctic wide sea ice VOLUME as opposed to relying on models. That, in itself, is most exciting…
Dagnabit! Off the AGW wagon not of!!! *sigh*
Oh my god,
What the Hell is going on here,
The warming east of Greenland ( Hudson-Bay) is a result of the negative NAO/AO. In Europe it have some of the coldest day ever but it must mean that the warm is on another Place..
or look here:
http://www.esrl.noaa.gov/psd/map/images/fnl/sfctmpmer_01a.fnl.gif
Typical AO/NAO negativ Anomalys
greets from Germany
REPLY: scroll down on the main page, we already covered this – Anthony
““Nobody really knows how the Arctic is going to behave as the ice retreats, but we do anticipate that significant changes will occur,” said Dr Seymour Laxon”
Well Dr. Laxon you seem to be assuming that the sea ice is going to retreat when the past few years it has expanded. Maybe as a scientist you should wait till you have your data and let it tell you what is happening rather than decide what your data will show before you even collect it.
The satellite measures the thickness of ice floes by the difference in return time of radar pulses from the top of the ice and the adjacent sea surface. No problem. But how does it measure ice thickness 100s or 1000s of kilometers from any open water? I can imagine an algorithm for that, but can it *measure* ice thickness without nearby open water?
OK, so I’ll bite.
What means “Gravitational Level” ? And is that “Gravitation” adjusted for the earth’s rotation; seeing as how the earth does rotate, and that would affect local “gravity”.
Why do these graphs always raise more issues than answers ?
Actually, “fall of the AGW wagon” has a poetic ring to it, sort of like “die by the gun.”
But its ability also to map the shape of the sea surface will tell scientists if Arctic currents are changing as a result of winds being allowed to blow more easily on ice-free waters.
Allowed? Man is controlling the winds now? /head desk
Robert M. says:
“Umm, Psst Guys, There has been zero trend in global sea ice extent in recent decades.”
___
Umm…not so fast there Robert. A simple glance at the global sea ice chart tells you that you’re wrong:
http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/global.daily.ice.area.withtrend.jpg
Why are you wrong? Simply because the seasonal loss of sea ice in the N. Hemisphere has been greater than the seasonal gain of sea ice in the S. Hemisphere…i.e. a steeper down averaged against a less steep up equals a down…and so I’m sorry to be such a “downer” on your little conjecture, but the data tell the story.
Mmmm, tasty data; needs a little less spin though.
DesertYote says:
December 22, 2010 at 2:19 pm
Mmmm, tasty data; needs a little less spin though
______
Tasty Data? Spin Dough? When I was in ccllege and made Pizza for a living I was King of spinning the dough and never had one stick to the ceiling (on accident).
George Smith —
“Gravitational Level” is technically called “geoid”. It is the theoretical surface where the strength of gravity is constant. Since the Earth is not uniform, the geoid bulges up where it is denser and down where it is less dense. The actual shape can be quite complex. There are places in the US where the equipotential surface or geoid varies several meters over a few tens of kilometers. Satellites use a smoothed geoid with features no smaller than a few kilometers.
The geoid is harder to determine than “sea level”, but is more dependable because it doesn’t change with tides, winds, currents, etc., and is available in the middle of continents.
The Equivalence Principle tells us that all accelerations are equal in the sense that the source doesn’t matter, whether gravity from mass or motion caused by force. Since the geoid follows a constant acceleration value, the rotation of the Earth is factored in automatically.
Just in time to watch the ice increase again. I wonder how they will explain that?
So when can we expect to see some pretty graphs using this new data? Anything similar to The Cryosphere Today page out there yet? It will be interesting to see how it compares to PIPS and PIOMAS. It may put to rest the debate over which one is more accurate when actual measurements are available for comparison.
I agree R. Gates. The fact that we will now know, as opposed to just guessing (or believing), is exciting unto itself. While it may be a time for some to gloat at the opposition, let’s hope that measurements reveal a non-issue with sea ice. Not just because I am sceptical of AGW but because then we can focus on more pressing concerns like actual pollution, poverty and corruption.
MrC
The biased is spoiling the party.
Crysosat has no way of measuring snow depth. All they can do is use modeled snow depths. So their data is simply another model, Since Real data + model = model.
They will then be able to reach any conclusion they wish.
Every piece of new equipment is subject to new interpretation. In the absence of any reference point, the interpretation will be in the eye of the beholder. If a grant is at stake, the interpretation will be…you guessed it…dire, indeed.