You gotta love it when the Earth gives back the love, especially today.

Those who have been following NSIDC and JAXA sea ice plots have noted that this has been an extraordinary year so far, with Arctic sea ice hitting the “normal” line on some datasets. Today the Earth gave back more for us.
As of today, JAXA shows that we have more ice than any time on this date for the past 8 years of Aqua satellite measurement for this AMSRE dataset. Yes, it isn’t much, but if this were September, and the sea ice minimum was down by this much compared to all other years, you can bet your sweet bippy we’d see it screamed in news headlines worldwide.
Of course some will argue that it “doesn’t matter” in the context of trend, or that it’s just a “weather” blip. Let us remind our friends of such blips the next time a heat wave or a storm is cited as proof of global warming.
What can be said about the short term trend in Arctic sea ice is that for the past two years, it has recovered from the historic low of 2007. It recovered in 2008, and more in 2009. If today’s Earth Day gift is any indication, it appears that it is on track now for a third year of recovery in 2010 as we’ve been saying at WUWT since fall of 2009.
I’d show NSIDC’s current Arctic Sea Ice graph also, but their website was down earlier today, and the current sea ice graph is not updated. But Steve Goddard has made some comparison overlays that are interesting.
He writes via email:
NSIDC’s web site is down today, but I overlaid DMI on top of the NSIDC graph and it should have hit the mean line today. Same story for JAXA. Images are below.
DMI uses 30% concentration, so their scale is lower than NSIDC and JAXA at 15%. I shifted the DMI data upwards and stretched vertically to visually match the NISDC data.

The second image is JAXA, DMI and NSIDC together. JAXA also needed to be shifted vertically as they apparently use a different algorithm for calculating extent than NSIDC. All three track each other fairly closely during the spring, DMI diverges from the others during the fall freeze up – probably because of the higher concentration requirements.

Blue is NSIDC. Green is JAXA. Black is DMI. The thick black line is the NSIDC mean. The dashed line is the 2007 historic low.
ADDED: Here is a wider view that shows that the three time series match closely over the interval of the NSIDC graph

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I think you’re still missing the point with the sea ice extent graph.
It’s not the extent you should be measuring, it’s the volume. Your graph showing that the Sea Ice extent has increased more in the antarctic is as meaningless as the one showing the sea ice extent has increased in the Arctic.
I made no mention of CO2 emissions or AGW, so I see no reason why you raise them. I was simply pointing out that the Artic Sea Ice isn’t the highest in 8 years so and that the title of this post [snip].
SteveE (07:52:58),
The entire basis of the global warming debate is whether an increase in human emitted CO2 will cause runaway global warming and climate catastrophe. If you agree that changes in Arctic ice extent are natural, recurring regional climate fluctuations, then we have no disagreement.
Also, ice volume has nothing to do with albedo. Albedo is a function of ice extent, not thickness. Disregarding the effect of changes in albedo ignores a major climate forcing.
Smokey (08:07:39) :
My point is that there is no evidence to support the claim that sea ice is back at the level was 8 years ago as the title of this post suggests.
I make no claim that this supports or disproves AGW. Just stating the facts.
As you said the planet doesn’t lie.
Smokey, what’s going on here?
Both R Gates and Anu came by with that graph and preached how the volume is what matters, that got hashed out, then the thread’s practically dead, and now this SteveE fellow comes by flogging the same graph and acting like he’s bringing up some brand new point that was never considered before!
Is there some plot afoot where the “other side” will keep bringing up old stuff like it deserves fresh new debate until skeptics give up in frustration and let it stand?
Late and maybe a bit OT, but…
Someone I used to know well, Amelia Russell, reached the North Pole, unsupported, yesterday.
http://northpolechallenge.co.uk/
She is, apparently, only the third woman ever to achieve this.
Catlin, eat your hearts out.
Cheers,
Neil
SteveE
What evidence then – if not this week’s sea average extent – WOULD you accept as showing conclusively that the admitted (NON-AGW influenced, wind-blown) ice loss in 2007 has been fully recovered from in summer 2008 AND more in the summer of 2009?
If NOT this week’s sea ice extent, what WOULD you accept to show that the artificial “average extent” based on 1970-era levels has been equaled?
(The planet does not lie. But we see routinely that politically-driven AGW advocates DO lie, exaggerate, and propagandize every (false and misleading) press release. And most AGW advocates and fellow travelers further write and promulgate/propagandize the biased “research” that passes through further biases in their prized so-called peer reviews.)
SteveE:
Many thousand arguments justify the world’s capitalist societies based on the claim that “AGW must be true because the Arctic Ice has been melting. ( Your several statements above expand this by claiming that increasing sea ice extent does not matter, only sea ice volume matters… )
Therefore, the AGW claims are : Catastrophic Global Warming is real because the temperature is increasing, and we can prove temperature is increasing because the Arctic Ice is melting. (Your argument: “.. because Arctic Ice is volume is decreasing …” must be made because sea ice extent is increasing back towards normal; though your argument still accepts the assumption that increasing temperature causes the original sea ice melt.)
We have measurements – shown every day in WUWT for 80 deg north – that Arctic temperatures have NOT increased since the 1950’s. Summer Arctic temperatures have remained constant despite 60 years of increasing CO2 levels.
So, how much Arctic ice “should have been” (could have been ?) melted by the claimed GISS change in global surface temperature of 1/2 of one degree, and when did this increase in temperature occur during the Arctic year?
(That is: If the change in temperature was in spring, fall, or winter, there would have been no melting. If in summer, his surface temperature that was to “increase ice melt” most emphatically did NOT occur – since we have daily Arctic temperature records for 80 deg Latitude showing “no change” at all.)
Therefore, you must show that a 1/2 of one degree change in global temperature IN WINTER caused the change in volume claimed in your graph.
According to AGW theory, there can be no other reason for the supposed change in ice volume other than an increase in temperature. According to AGW advocates, the loss of ice volume proves the change in temperature, so therefore you (the AGW extremists) must be able to calculate ice loss based on below freezing winter temperatures.
Dr. Roy Spencer will be interviewed tonight (Mon.) on Coast-to-Coast from 10pm to 2am Pacific time.
RACookPE1978 (11:33:19) :
I would accept evidence supporting that the volume of ice is the same instead of mearly the extent. Otherwise it just comes across as a politically-driven exaggerated and propagandized press release.
RACookPE1978 (11:47:24) :
I agree with you that the decrease in ice volume is most likely do to an increase in temperature, however does these measurements that shows Artic temperatures have not increased take measure the air temperature or the sea temperature? As the ice is floating in the ocean I would have thought this would have the largest effect on the volume of sea ice. Just a thought.
With reagrds to it being 1/2 a degree warmer during the winter I would have thought that this would mean that less ice would freeze in the same time period. How much I’m afraid I don’t know, however there is a nice graph showing the decrease in ice volume so perhaps a relationship can be derived off of that.
I would hardly call myself an AGW extremist for pointing out that the data supporting this thread is exaggerated to prove a point.
I have repeated said that that I make no claim that this supports or disproves AGW. All I suggests is that this data supports the hypothesis that temperatures are increasing.
hiya
I checked with this chart ( ice area )
http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/sea.ice.anomaly.timeseries.jpg
And it seems very likely that the 2010 April ice did set a 9 year ( not just 8 ) record after all.
So you might want to put the record back to 9 years.
Where the heck is the easy download ice-area or extent data for the last 30 years? Only jaxa make AMSR-E’s 8.5 years worth of data easy to get.