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The sun rises two days early in Greenland

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GliderGuider Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Feb-02-11 08:34 AM
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The sun rises two days early in Greenland
The sun rises two days early in Greenland, sparking fears that climate change is accelerating

The sun over Greenland has risen two days early, baffling scientists and sparking fears that Arctic icecaps are melting faster than previously thought.

Experts say the sun should have risen over the Arctic nation's most westerly town, Ilulissat, yesterday, ending a month-and-a-half of winter darkness. But for the first time in history light began creeping over the horizon at around 1pm on Tuesday - 48 hours ahead of the usual date of 13 January.

The mysterious sunrise has confused scientists, although it is believed the most likely explanation is that it is down to the lower height of melting icecaps allowing the sun's light to penetrate through earlier.

This theory, based on the gradual decline of Greenland's ice sheet, is backed by recent climate studies.
A report by the World Meteorology Organisation shows that temperatures in Greenland have risen around 3C above average over the last year.
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joneschick Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Feb-02-11 09:04 AM
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1. does Puxatawney Phil know this?
:hi:
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FSogol Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Feb-02-11 09:07 AM
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2. What's Joshua up to now?
:shrug:
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BeFree Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Feb-02-11 09:11 AM
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3. Poles tilting?
Nah, poles don't tilt Or do they?

OMG what if the poles are tilting?
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joshcryer Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Feb-02-11 02:34 PM
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4. Isn't the land also upwelling here, too?
It could be a combination of the two effects. Ice melting, less weight on the crust, land upwelling.

It is alarming that this happened effectively in a year time frame, however.
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FreedomRain Donating Member (164 posts) Send PM | Profile | Ignore Thu Feb-03-11 04:30 AM
Response to Reply #4
6. most likely explanation
less weight on the continent due to glacier ice melting could easily allow the land to rise. Id think GPS would be able to yea or nay on that pretty instantly though
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petronius Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Feb-03-11 02:28 AM
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5. Perhaps a false sunrise due to refraction?
I think I'd want to see some geometric calculations before jumping straight to the lowered-horizon explanation - that requires potentially a lot of ice mass being moved in just a year...
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Nihil Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Feb-03-11 06:42 AM
Response to Reply #5
7. Seconded.
> I think I'd want to see some geometric calculations before jumping straight to
> the lowered-horizon explanation - that requires potentially a lot of ice mass
> being moved in just a year...

Lowered horizon from ice mass would require a huge revision to ice-loss estimates.
Isostatic rebound is a much slower process (and would have a more measurable effect
on high-tide levels).

> Perhaps a false sunrise due to refraction?

I suspect that the impact of increased freshwater outflow and increased surface
temperature will be affecting the local low-level atmospheric behaviour in ways
that they simply haven't encountered in the timescale that the "first day of sun"
records have been kept. Not so much a "false sunrise" but a "true sunrise for
the new conditions"?

:shrug:
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