Antarctic Ice Loss Big Enough To Cause Measurable Shift In Earth's Gravity
An anonymous reader writes: Contrary to what we were sometimes taught in high school physics, the Earth's gravity is not constant. It actually shows slight variations on different parts of the Earth's surface, and the variations correlate with the density of the material on that surface. The European Space Agency has been measuring gravity for four years, mapping these variations and recording the changes those variations have undergone. Its data indicates "a significant decrease [in gravity] in the region of Antarctica where land ice is melting fastest. Further analysis is, of course, planned so that the whole of Antarctica can be taken into account and "the clearest picture yet of the pace of global warming" can be determined on that continent.
...is some kind of joke. Right?
http://en.wikipedia.org/wiki/F...
http://en.wikipedia.org/wiki/F...
The Gutenberg Discontinuity, is the boundary, as detected by changes in seismic waves, between the Earth's lower mantle and the outer core about 1800 miles below the surface. It is also called the core-mantle boundary.
http://en.wikipedia.org/wiki/M...
I can't speak for all country, but in France you are taught 1) that gravity constant used varies and we get the values at equators, pole, (iirc 9.78 to 9.83 while we used 9.81) and our lattitude, altitude
2) but afterward to make it simpler we always assume it is a constant because we do not have the math tool to integrate with g(r,theta, rho) over complex surface.
At no point we were taught that gravity is a constant. What we were taught is to use it as constant in simplified problems. That is a difference. I would wagger it is the samer in the country of the submitter, only he missed the important semantic difference.
C. Sagan : A demon haunted world:
http://www.amazon.com/gp/product/0345409469/
visit randi.org
...I'll be .00000001 oz. lighter than without global warming. We're doomed!
I thought ice was less dense than water or most rock/soil. so if that was the case the loss of less dense ice for water or soil would increase the gravity no?
Wow. In complete denial of the FACT that Antarctic sea ice is at the HIGHEST LEVEL in decades, these Global warming cult members keep spreading the blatantly false propaganda. Now they are saying that if I don't drive a Prius, that the earths gravity will fail. ...and the gullible liberal Gore-sheep keep lapping it up like the good little useful idiots they are
Wow. In complete denial of the FACT that Antarctic sea ice is at the HIGHEST LEVEL in decades, these Global warming cult members keep spreading the blatantly false propaganda. Now they are saying that if I don't drive a Prius, that the earths gravity will fail. ...and the gullible liberal Gore-sheep keep lapping it up like the good little useful idiots they are
Sarah Palin?
The anti-science idiocy on Slashdot is really reaching new proportions.
Yes, melting ice results in measurable changes in gravity. Lots of things do. People use these techniques to detect oil fields, ground water, and lots of other things.
"Measurable Shift" could mean "Not noticeable by any living organism."
gr8 b8 m8, im ir8
i r8 8/8
The shift is very small.
Of course, the instruments measuring it can never ever be faulted ?
_ _ _ Go for the eyes Boo! GO FOR THE EYES!
the next big diet fad.
At the club in Mcmurdo Station....
"the clearest picture yet of the pace of global warming"
So the clearest picture of global warming is in area very small compared to the whole globe?
Get your hand off it.
... that the gravitational constant is not a constant!?!?!?
Ladies and gentlemen, the Gish Gallop.
In complete denial of the FACT that Antarctic sea ice is at the HIGHEST LEVEL in decades, these Global warming cult members keep spreading the blatantly false propaganda.
Does the expansion of sea ice mean that the total volume of sea and land ice has gone up? Does it even mean that the volume of sea ice has gone up or is it just being spread thin?
You have cherry-picked a single variable that has gone up and ignored the bigger picture, and then made the outrageous claim that it is the people who actually measure the total ice that are spreading false propaganda.
Answer one question: has the volume of land ice gone up or down? If the answer is down, why is it so unimportant for you to mention this inconvenient fact?
On second thoughts, we can ask an even easier question. Has the total volume of ice gone up or down? According to the article, the gravitational measurements show that it has gone down. Why are you in complete denial of this FACT?
What conclusions are we supposed to draw from that? Well, other than that you don't know the difference between "land" and "sea".
I'm getting tired of hearing about how all life on Earth will end in a few years unless we vote for just one political party and their pet doomsday cult.
I'm sorry that you are getting tired of this, but in this case you can rejoice! Because nowhere in the article did they state such an absurd line.
There is no point making up quotes to get offended by when you could just comment on the actual story at hand. Your entire post has absolutely nothing to do with measuring the gravitational changes of melting ice.
Here's wapo two weeks ago telling me Antarctic ice is increasing — because of AGW.
The pause is a skeptic fraud. The pause is real and caused by AGW.....
"We Have Always Been At War With Eastasia"
Fuck off with your head games.
I read just the other day that Antarctica has more ice than ever!
It is not necessarily as simple as that. For example the gravitation field near mountains is actually less that that further away from them. Mountains are areas of thicker continental crust and this displaces the denser underlying mantle meaning that there is actually less mass near mountains despite appearances to the contrary.
In this case it looks like the hots spots are right on the coast so is it possible that the ice has actually thickened and displaced more of the denser sea water? This might also cause a decrease in the gravitational field there. It would be nice if articles actually discussed some details of the science and some of the effects which researchers have considered.
Honestly, when the fuck are people going to be done banging the fucking global warming bell? We've gone from global warming to global climate change to global wow the ice caps are bigger than we remember from last 10 years. Give it a fucking rest already. The damn naturally occuring volcanoes give off more greenhouse gasses in a week than 50 years of modern innovation has ever produced. Honestly. Enough. Tired of it now. Can I vote against you all? Somehow? I want to. Seriously.
The cryosphere page at University of Illinois-Champagne shows that we are currently seeing more sea ice than the average, and the levels have been sharply rising the last few years.
It is the same effect: The ice on the land is melting and flowing into the sea where some of it re-freezes.
The area of ice is increasing, the mass of ice is decreasing.
Actually, yes. Remember to vote; I'm sure the coat-tail-campaigner can change things within their term - after all, they claimed they'd make a difference.
In complete denial of the FACT that Antarctic sea ice is at the HIGHEST LEVEL in decades, these Global warming cult members keep spreading the blatantly false propaganda.
This would be wrong. It has been known from the older GRACE satellites that Antarctic Ice has been losing mass from the ice sheet.
In Antarctica the mass loss increased from 104 Gt/yr in 2002–2006 to 246 Gt/yr in 2006–2009, i.e., an acceleration of 26 ± 14 Gt/yr2 in 2002–2009. (Increasing rates of ice mass loss from the Greenland and Antarctic ice sheets revealed by GRACE, I. Velicogna, Geophysical Research Letters, (2009))
You might be thinking of the Antarctic Sea Ice.
Now they are saying that if I don't drive a Prius, that the earths gravity will fail.
I don't think that that's what they're saying.
My reading of it is that they're saying that Antarctica and Greenland together are now losing 500 cubic kilometers of ice per year. They don't mention what will be the effect on that of you driving a prius, but I suspect not a lot.
This was measured using Gravity. I don't think that they say that gravity is failing.
The article barks at the wrong tree. The cryosphere page at University of Illinois-Champagne shows that we are currently seeing 1.3 million sq. km more sea ice than the average, and the levels have been sharply rising the last few years.
There is a fine balance between trying to increase awareness and being a downright propagandist. Unfortunately, this article doesn't help the cause. This is exactly the kind of thing that make people believe environmentalists are exaggerating and grasping at straws.
Wired: Stop. You are not helping.
Before you go on you really should learn the difference between ice sheets, ice shelves and sea ice. They are not the same thing. Talking about sea ice in response to this article about the West Antarctic Ice Sheet is a non-sequitur.
And then there's the pretense of not naming a specific political group. Hmm, I wonder who they heck it is referring to? The Amerian Conservative Party (2008), American Freedom Party (2010), Justice Pary (2011), Objectivist Party (2008), Pirate Party (2008), or Unity Party of America (2004)?
If the list seems biased to the right, it's because I decided to pick political groups that were started in the 21st century, and you have to go back to the 1980's to find anything left wing.
So who could it be? Starts with a D, ends with a C, has 10 letters including the vowels a,e,i, and o: D-m-cr-t-c Party. I'd like to buy a vowel, Pat.
Why is Snark Required?
I'm getting kinda tired of the Global Warming doomsday cult
Good marketing there, mate. The PR professionals of the denialist movement like to throw around words like "cult" or "religion" for the scientific movement that they are trying to attack.
Casting the scientific position as religious attacks it's greatest strength, that it is scientific, and therefore our best guess of truth.
While I don't ignore the fact that man can alter the weather to some degree.
Okay.
I'm getting tired of hearing about how all life on Earth will end in a few years unless we vote for just one political party and their pet doomsday cult.
The article is about ice loss on the Antarctic. It doesn't discuss who you should vote for. It doesn't even assume the reader is in any country or democratic precinct.
Apparently, the sun has nothing to do with climate.
The current warming is not due to the sun. This can be shown because the current warming is occurring more in winter and night, as you would expect from greenhouse warming which slows the rate of heat loss. The sun would warm more when it is shining.
It can also be shown by the cooling of the stratosphere, showing that less heat is reaching the stratosphere from below. The sun would increase the temperature of the whole atmosphere.
But also Solar activity does not correlate with the current warming.
Also, all global warming and ice age events for that last 100 million years were caused by present day American pollution but non-American pollution doesn't do anything....especially is it comes from China and India.
I think that this would be wrong.
Do you have a source?
So just remember, Al Gore has a carbon footprint 10000 times larger than you and is swimming in millions of oil dollars from the Middle East.
I believe that Al Gore is carbon neutral.
Maybe the real problem is that we didn't have significant historical data available for us to originally start claiming an arctic-melt-crisis when we did oh so many years ago, but we did anyways, and it now that the data doesn't line up it's incredibly unpopular for us to point out the obvious. Seriously, Bob - are you done making us look bad, or what?
Science reporting fail. Seriously. When you're wrong, or shit doesn't line up like you predicted, you point it out with a big, red marker. "We found unexpected deviation right fucking here, and we don't yet know why." Science is a community, and we learn as a community through collective experience. The argumentists in this emotional case are the ass hats that are still infuriatingly mad that their original predictions aren't still becoming reality. (To those people, I say: "Reality is allowed to change, that's the point, and you're actually not as smart as you thought-and-suggested that you were. Welcome to life.")
Quite honestly, the scientist in these researchers should be sparking the question "why", not the questions "what can I say to save face" or "why don't these fools agree with me"...
Hey, everyone! I found another American. You can tell by the fact that he doesn't know that gravity fluctuates.
Oi, American, read the Frenchie's expose on what he was taught in high school physics. You can catch up with what the rest of the world knows.
We broke the motherfucking planet! We broke themotetrfukcing Planet! zOMG!!!! And it's because we're teh suxxors! It's OUR FAULT!! !!!! :: runs around the room flapping my arms like a faggot ::
We're doomed, i say! Doomed!
Al Gore, save us!
Wow, another climate change article on what used to be a tech-oriented site but is now the "personal agenda with only minimally justification via tech" site. Color me surprised.
We have to tear down all buildings, as they're slanted now.
On the bright side, perhaps the tower of Pisa will one day be straight again.
If Pandora's box is destined to be opened, *I* want to be the one to open it.
The article says: "They (scientists) have found that the loss of ice from West Antarctica between 2009 and 2012 caused a dip in the gravity field over the region."
Loss of ice is mentioned as a well-known fact, no proof is given.
However, Antarctic ice surface is growing (http://news.slashdot.org/story/14/09/15/1158253/extent-of-antarctic-sea-ice-reaches-record-levels). The ice volume is probably more difficult to determine, so there are less scientific papers about volume, however, according to this model: http://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-13-00301.1?af=R&#.Uvnt2RsanUw.twitter Antarctic ice volume is increasing and not decreasing.
What if gravity changes have other reason than the loss of ice? In my opinion, the topic is very controversial, it is far from being as clear as article suggests...
Can any one tell me what is new in slashdot.org?....
Lost it when you said you believe Gore is "carbon neutral." Just because one buys carbon credits doesn't mean that all the carbon one released magically goes away! Hahahahaha. You are seriously a dumbass to swallow that shit.
Never trust the French. They give up too easily.
"Scientists are now armed with the most accurate gravity model ever produced."
Unfortunately "global warming" has become politicized to the extent that it's really hard to follow the science and technology being discussed. For me the original article is about measurement and our ability to detect minute changes in gravity. There is no "global threat" from the ebbs of gravity. But the scientists behind the satellite gravity monitoring probably figured that introducing the findings with "reveals" and relating the tools to "climate" would find a "hook" in the global warming debate. Not dismissing the debate, and this new ability to measure the ebbs and flows of gravity may well tell us something about "global warming". We just don't know what that would be yet, but the tool gets pulled into the shouting match.
Science is like "South Park". Science is not your Political Ally, no matter what you believe. http://www.huffingtonpost.com/... South Park
Gently reply
FWIW, Stephen Colbert recently said that he doesn't deny that the climate is changing. His opinion is that we shouldn't do anything about it.
So when everyone says I'm getting heavier, they really mean Antarctica melted a bit more?
sad thing is over the past 4 or 5 years, at least based on american media it looks like the french have more balls than we do at this point in time.
have you seen my sig? there are many others like it but none that are the same
Lost it when you said you believe Gore is "carbon neutral."
Thanks for reading the whole thing, but that wasn't the most important point. I hope you also noted how we know that it is the enhanced greenhouse effect and not the sun that is causing the current warming. Perhaps you even noticed that some of your language is the same as that developed by PR groups with a counter-scientific agenda to market.
Just because one buys carbon credits doesn't mean that all the carbon one released magically goes away!
No, it doesn't go away. But if you sequester the same amount of CO2 that you emit, then the net effect on the atmospheric concentration of CO2 is zero.
Hahahahaha. You are seriously a dumbass to swallow that shit.
...
It's not that they cherry picked(in this particular case). For once I'm willing to give the deniers some credit. Extent was the only meaningful objective metric we had about Antarctic ice until climate change research raised the question of thickness, and some very smart people went looking for ways to tell.
Extent's easy, you just take satellite images(okay, without space tech this would be impossible), apply some transforms to make them properly proportional, run a quick area approximation, and poof, you've got your number.
We've had that for decades. And we had no way to tell how thick it was until experiments like this one. So rather than cherrypicking, they were looking at the only numbers we had available, which is actually moderately reasonable.
It's worth nothing. He's a damn comedian.
So we have to prove we're not "chicken littles" or whatever these guys call us by pointing out the fairly obvious fact that sea ice melting doesn't mean the end of gravity as we know it. I mean, it's hard enough that we have to deal with those couple of non-scientists who are actually making unreasonable dire predictions(unlike the reasonable very very very concerning ones based on objective assessment), but we also have to deal with this completely imagined alarmism.
Possible 0.4mm global sea level rise. Very scary.
University of Colorado, Cooperative Institute for Research in Environmental Sciences and Department of Physics, University Campus Box 390, Boulder, CO 80309-0390, USA.
Science (Impact Factor: 31.2). 04/2006; 311(5768):1754-6. DOI: 10.1126/science.1123785
Source: PubMed
ABSTRACT Using measurements of time-variable gravity from the Gravity Recovery and Climate Experiment satellites, we determined mass variations of the Antarctic ice sheet during 2002-2005. We found that the mass of the ice sheet decreased significantly, at a rate of 152 +/- 80 cubic kilometers of ice per year, which is equivalent to 0.4 +/- 0.2 millimeters of global sea-level rise per year. Most of this mass loss came from the West Antarctic Ice Sheet.
Al Gore isn't sequestering anything. He's running a scam to increase his wealth.
Seriously, just like China's massive earthquake caused by their dams and reservoirs, the loss of land ice will very likely cause a major Antarctica earthquake. Upon happening, that will likely crack open a number of glaciers.
I prefer the "u" in honour as it seems to be missing these days.
land ice decreasing, while sea ice increasing.
I prefer the "u" in honour as it seems to be missing these days.
"Contrary to what we were sometimes taught in high school physics, the Earth's gravity is not constant."
I began my education in 1961. That's pretty far back, I guess. I learned a little about gravity before I left elementary school. Then, a bit more in junior high school. Junior high didn't teach me that gravity is constant on the earth's surface. I was exposed to the idea that gravity varies from one place to another, and we were taught that our weight might vary by a couple of pounds depending where we stood on the earth. Cool idea, we were moderately impressed. In high school, the idea was given to us again.
Now, I suppose that SOME schools might teach that gravity is a constant, independent of elevation, or anything else. I believe that most parents would want to keep their children far away from any such schools.
"Windows is like the faint smell of piss in a subway: it's there, and there's nothing you can do about it." - Charlie Br
Al Gore isn't sequestering anything.
No, he's buying offsets from companies that are sequestering.
He's running a scam to increase his wealth.
He made a lot of money from when he was working for Apple. And the movie was a bit of a blockbuster. He has made some savvy investments in green companies too, but he's also donated millions to the Alliance for Climate Protection.
This study doesn't show a thinning of the sea ice, but of the ice sheet. It would be tricky to measure the thickness of sea ice using gravity variations, because in only barely floats.
The reason the deniers are wrong about sea ice extent is because they're choosing to only look at the southern hemisphere, where there is nearly no sea ice. The global trend in sea ice is downwards. I think that that does count as cherry picking.
Once again, someone thinks they're smarter (and more rigorous) than the scientists who are actually doing the measuring, but is incapable of distinguishing the difference between *LAND* ice and *SEA* ice. As the land ice melts, an increase in sea ice is expected, because the melting land ice dumps *fresh* water into the adjacent oceans, thereby reducing the salt concentration, and raising the freezing point of said water.
Unfortunately for your presumption, the very *second* sentence of the paper you linked to ("However, observations of decadal trends in Antarctic ice thickness, and hence ice volume, do not currently exist.") pretty much kills your claim that "Antarctic ice volume is increasing". A few sentences later in the abstract of the paper, which discusses a proposed *model* to provide estimates of volume based on known factors, your claim is put to rest.
"The model suggests that overall Antarctic sea ice volume has increased by approximately 30 km3 yr-1 (0.4% yr-1) as an equal result of areal expansion (20 x 103 km2 yr-1 or 0.2% yr-1) and thickening (1.5 mm yr-1 or 0.2% yr-1). This ice volume increase is an order of magnitude smaller than the Arctic decrease, and about half the size of the increased freshwater supply from the Antarctic Ice Sheet."
Reading comprehension for the win!
Just to make the above statement more clear, your claimed Antarctic ice volume increase is a modeled *sea* ice volume increase roughly equivalent to roughly *half* of the *land* ice loss. (That's still a net loss equal to 50% of the measured land ice loss.) It's also an Antarctic sea ice volume increase equivalent to roughly 10% of the measured Arctic sea ice loss.
So, your vaunted "Antarctic ice increase" means that the ice loss to ice gain ratio is roughly 12:1. (12 times as much ice is lost as is gained through the increase in Antarctic sea ice.)
everyhwhere. Sorry but i was taught that the earth-axis shifts (depending on many things, not only melting ice-cream) and that as early as the 5th grade. Thank you germany for being good to my knowledge...I feel sorry for nowadays pupils though since their teachings have degraded to a level at which it is are compareable with the authors. So rise up! and fight for your knowledge!
Here is a graph of arctic melting relative to models. You will note that the Arctic has melted much faster than the models predicted. We've already seen melting that we didn't anticipate until 2050. So perhaps some introspection is in order, but not quite the way you are suggesting: http://icons.wxug.com/metgraph...
Apparently, the sun has nothing to do with climate.
Not sure I should engage with the "Science=cult" crowd, but... Of solar output affects surface temperatures, just not enough to counter the warming effect of CO2. Solar output has been dwindling since the 80's while global temperatures have been rising: http://woodfortrees.org/plot/p...
Oh, yeah, they're absolutely shit about intellectual honesty in the general course of events. I was just trying to helpfully clarify.
I can't speak on the first or third claims (nor can I recall ever hearing them) but I was recently researching various solvents for a particular application, some of which were CFCs, so I do have some information regarding those-
Although the Montreal Protocol limiting CFC use began to come into force in 1989, it is implemented gradually, and the last of the provisions won't come into effect until 2030. Then you have the fact that decades of damage will take decades of recovery; the recovery is estimated to be complete around 2050-2070. You're about half a century too early to start talking about "proven lies". Despite the timetable involved, as of 2010 the ozone layer had already began a measurable recovery.
Wikipedia is a good place to start researching these issues, particularly the article on the Montreal Protocol contains citations to primary sources on all the facts I have mentioned here. If the other two claims you take issue with aren't strawmen, I imagine you can find more information on those as well.
Doesn't "liquid" water have a higher density than "solid" water/ice (ice "floats" on water)... Wouldn't (theory) more water mean "more" density, i.e. more gravity... Maybe the liquid is dispersed easier/faster around globe (which would cause a locaized decrease in mass), but I would think it would be absorbed in the local strata/ecology which would add mass. Just a thought.
Its the Global Warming diet. Weight loss is guaranteed!
I'm afraid this is all a misunderstanding. The shift in gravity was your mom rolling over in bed. I'm just glad I got out of the way in time unlike the other eight guys.
To get off you have to bang the slut that bangs eight other guys at the same time? Ew, you must be the world's biggest loser, bro. She's problem a mom to a lot of your loser kids, too.
Bang your mom? Not me.
Did you ever wonder who is holding the camera? It is I.
Now they are saying that if I don't drive a Prius, that the earths gravity will fail
You appear to be getting your advice from used-car salesman. Or was that your parents trying to sell their Prius to you?
Now I don't have to lose as much weight as I thought. I feel lighter already. I can put my gym fees toward supporting global warming...
Because this is clearly inferior. Play with it a bit. Play spot the warming.
https://www.climate.gov/news-f...
Note:
1) 1998 - 2015
2) 1880 - 2015
3) 1978 - 1998
4) 1947 - 1957 - this is when all that sea ice grew.[1]
Odd is was so cold at a time of peak smog.[2]
[1]"In the early 1920s and 1930s, temperatures were high, similar to that of the present, and this affected the glacial melt. At the time many glaciers underwent a melt similar or even higher than what we have seen in the last ten years. When it became colder again in the 1950s and 1960s, glaciers actually started growing," says Dr. Kurt H. Kjær - in http://www.nature.com/ngeo/jou...
[2] http://en.wikipedia.org/wiki/G...
Need Mercedes parts ?
actually, it was global warming theory that predicted that sea ice would increase.
The entire continenet is losing mass.
It's simply several magnitudes larger on the western subcontinent beacuse of the weather patterns and ocean circulation (etc) that side is exposed to.
And again: WHAT MONEY?!? There is no money money rolling in.
I direct you to: http://arstechnica.com/science...
The guy who said the election was rigged won the presidency with the second-most votes.
Well, maybe if the other side stopped denying it even exists, they might be worth voting for. I dont "believe" (as much as one can "believe" in science) in global warming because it's "my party's platform" (and actually it's not my party, im registered indepenedent). I vote for that party party because their goals coincide with mine.
Did you know that if you drop a spoon into a sink of water, a drop can rise higher then the initial height of hte spoon ?
for many years, the parents of warming deniers said this was not true
Attention: it is actually quite easy to produce models where global warming = more wind = circular wind that isolate warm tropic air from antarctic = more antarctic sea ice (you may notice, looking a map of the world, that distribution of water and land is not the same at N and S poles)
Place your bet: Should we spend 1% of global GDP (~ 900 billion/year) on anti climate change or not ?
If you bet NOT, and are wrong, boy, are we gonna pay for it
1) It didnt happen because they reduced emissions and began filtering out the chemicals that would lead to the majority of it.
2) We banned CFC's, and the ozen hole is indeed shrinking. What, you thought after 50 years of use and just dumping it straight into the air, the effect would be instantaneous?
3) The Sahara HAS expanded. The tropics (the longitudinal bands that define them) are getting larger.
The only one being dishonest here is your ignorant self.
The guy who said the election was rigged won the presidency with the second-most votes.
just to be clear the definition of a "desert" has to do with its annual precipitation, not "how green it is".
The guy who said the election was rigged won the presidency with the second-most votes.
Most likely, people are confused by the fact that arctic sea ice extent is considered a measure of global warming. They expect to use the same metric in the antarctic, not understanding that it's the melting of land ice (and thus reduction of salinity) which causes the larger extent of sea ice in the antarctic.
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What will happen when a https://en.m.wikipedia.org/wiki/Heat_bomb is dropped on https://en.m.wikipedia.org/wiki/Antarctic_ice_shelves
Casteism