"In a time of universal deceit telling the truth is a revolutionary act." -George Orwell

Posts Tagged ‘Greenland ice Sheet’

Sea Level Rise Is Accelerating Faster Than Projections: Drinking Water Supply Threatened In South Florida

In Uncategorized on March 2, 2015 at 7:51 pm
Map of the Miami area, where colors indicate the depth to the water table. A lot of area is covered by 0-4 feet, including all of Miami Beach.

Map of the Miami area, where colors indicate the depth to the water table. A lot of area is covered by 0-4 feet, including all of Miami Beach. Keren Bolter, Florida Atlantic University

Oldspeak: “Given that as Guy McPherson so eloquently stated “In the past 30 years, we haven’t done SHIT about climate change. NOTHING.”; this news is pretty unsurprising. When you consider, the international body that is influencing climate policy is working from data that is often years old and doing nothing but kicking the can down the road, as though that were an option, news like this will become more common, and more devastating to human industrial civilization. Meanwhile, playgrounds and condos and malls are being built in coastal areas right now, as though they won’t be under water in a few years. The popular opinion of abrupt climate change seems at this time to be as New Jersey’s Bloviator-In-Chief Chris Christie bellowed “We’re stronger than the storm.”
Leisure cruise and global shipping routes are being plotted through the soon to be ice free arctic. As though there will be a life sustaining climate and sufficient resources to support an ever growing industrial civilization. Major countries are staking claims to fossil fuel resources under the ice. As though the disappearance of the ice and drilling in the sea bed won’t cause unknown disruptions, melting and off-gassing of the methane clathrates in the sea bed that will lead to catastrophic warming and extinction at any time. We’re living and breathing denial and it’s terminal. Our time is short. In that time lets be present to what is going on in the world today.” -OSJ

By Neel V. Patel @ Wired:

You don’t have to look 85 years into the future to see what a sinking world looks like—you only need to look as far as Miami.

Climate scientists have been warning the world about sea level rise for years, pleading with governments to cut back on carbon lest all our coastal cities go the way of Venice. In 2014, the Intergovernmental Panel on Climate Change released its fifth Assessment Report, predicting that oceans would rise more than 3 feet by 2100. Those projections make for some alarming visions of the future—cities water-logged, monuments submerged, islands created.

But the flooding is already happening in Florida. At the University of Miami’s Department of Atmospheric Sciences, Brian McNoldy and other researchers have been accumulating sea level data from Virginia Key (a small island just south of Miami Beach) since 1996. Over those nineteen years, sea levels around the Miami coast have already gone up 3.7 inches. In a post updated yesterday, McNoldy highlights three big problems that follow from those numbers—and they should worry all of us.

First: Sea level rise is accelerating—perhaps faster than the IPCC has projected. When McNoldy tracked the average daily high water mark, when flooding events are most likely to occur, he saw it increase over time—but he also saw the rate of that increase go up. The last five years saw an average increase of 1.27 inches of water per year. If that rate holds steady for the next 50 years (and if McNoldy is right, it will only get worse), high tide levels in Miami would go up over five feet.

Second: Predictions about day-to-day tide levels are less accurate than ever, threatening the city’s ability to plan for weather events. Tidal predictions are made through what’s called “astronomical factors”—essentially the moon’s orbit around the earth. But these don’t take into account factors like weather or sea level rise—so as climate change exacerbates sea level rise, tidal predictions will be more and more unreliable. While water levels in May 1996 typically were close to predicted values, McNoldy observed that the same values in May 2014 were consistently higher than predicted. That kind of discrepancy can’t be caused by weather alone.

Third: Besides creating higher risks of flooding, sea level rise is creating an unexpected danger: saltwater intrusion into aquifers used to extract freshwater. Almost 90 percent of south Florida’s drinking water is supplied by porous limestone aquifers. As sea levels rise, the saltwater exerts more pressure on the fresh water in the aquifer, and fresh water is pushed off further from the coast. Already, some cities have shut down wells because of saltwater contamination.

Based on what scientists can glean from sea level data from the past 20,000 years, McNoldy estimates that the world could still have up to 100 feet of sea level rise to go. He believes even if humans were to slow down or stop the man-made factors contributing to climate change, “we’re already pretty well committed to significant sea level rise. We would be more prudent to consider how to adapt to those conditions.”

World’s Largest Ice Sheets Melting At Fastest Rates In Recorded History

In Uncategorized on August 29, 2014 at 7:31 pm

Oldspeak: “Our planetary thermostats are melting. This trend is irreversible. And with sociopathic corporocratic governments jockeying for position and engaging in all varieties of proxy and direct resource wars to secure and exploit any and all remaining fossil fuels; we can expect warming and melting to increase.  The more ice melts, the more climate refugees are created. The more coastal cities and islands go underwater. The more and more catastrophic damage will be done by ever more powerful and extreme weather events. The more life extinguishing, climate altering greenhouse gasses are released. Sooner rather than later, the conditions necessary for sustaining life will be no more.  We are bearing witness to earths 6th and quickest developing mass extinction. Enjoy the show! Tick, tick, tick, tick, tick, tick, tick, tick…” -OSJ

By John Queally @ Common Dreams:

The world’s two largest ice sheets in Greenland and Antarctica are melting at the fastest rates ever recorded, according to a new study based on detailed satellite imagery.

Presented by scientists at the Germany-based Alfred Wegener Institute, the new research was conducted with the help of sophisticated mapping technology and the use of an ESA satellite (called CryoSat-2) which used radar technology to generate highly accurate elevation measurements of the ice sheets.

What the detailed look at the ice shows is devastating.

“The volume loss in Greenland has doubled since the [year 2000],” explained AWI glaciologist and co-author of the report Prof. Dr. Angelika Humbert. “The loss of the West Antarctic Ice Sheet has in the same time span increased by a factor of three. Combined the two ice sheets are thinning at a rate of 500 cubic kilometres per year. That is the highest speed observed since altimetry satellite records began about 20 years ago.”

Speaking with the BBC, Humbert went further, stating: “The contribution of both ice sheets together to sea level rise has doubled since 2009,” she said. “To us, that’s an incredible number.”

The Huffington Post reports:

The glacier melting the fastest among those measured was the Jakobshavn Glacier in Greenland and the Pine Island Glacier in West Antarctica. The Jakobshavn Glacier is descending into the ocean at a rate of 46 meters — or half a football field — each day. Last year, a chunk of ice twice the size of Detroit broke off the tip of the Pine Island Glacier.

Robert Bindschadler of NASA’s Goddard Space Flight Center recently contributed to a similar study for the Potsdam Institute for Climate Impact Research. “Rising sea level is widely regarded as a current and ongoing result of climate change that directly affects hundreds of millions of coastal dwellers around the world and indirectly affects billions more that share its financial costs,” he said in a press release. By 2100, ice melt from Antarctica alone could add up to 37 centimeters, or more than 14 inches, to global sea levels.

Another study published in the journal Science this month shows that in the last 20 years, human-caused climate change has become the primary driver of glacial melt.

 

 

 

 

“More Like The Whole Enchilada”: Arctic Stratospheric Warming Event Pushes Entire Polar Vortex Down To Middle/Lower U.S.

In Uncategorized on January 7, 2014 at 8:17 pm

Oldspeak: “At the peak of the Arctic outbreak, temperatures may be between 20°F and 40°F below average in large parts of the continental U.S., with dangerous wind chills affecting cities like Minneapolis, Chicago, Cleveland, St. Louis, Washington, D.C., New York, and Boston. The U.S. will have the dubious distinction of experiencing the largest cold temperature anomalies of any land area in the Northern Hemisphere during the height of the biting cold… The cause of the Arctic outbreak can be traced to northeastern Canada and Greenland, where an area of high pressure and relatively mild temperatures is set to block the eastward progression of weather systems, like an offensive lineman protecting the quarterback from the other team…  The atmospheric blocking is forcing a section of the polar vortex to break off and move south, into the U.S. The polar vortex is an area of cold low pressure that typically circulates around the Arctic during the winter, spreading tentacles of cold southward into Europe, Asia, and North America at times. Except this time, it’s not a small section of the vortex, but what one forecaster, Ryan Maue of WeatherBELL Analytics, called “more like the whole enchiladaAndrew Freeman

More than half the US population is under a wind chill warning as a blast of freezing Arctic air sweeps south and east across the country, bringing the coldest temperatures for decadesThe US saw colder temperatures than Almaty, Kazakhstan, where it was -22C (8F), Mongolia at -23C (-8F) and Irkutsk, in Siberia, at -33C (-27F)… The National Weather Service has issued life-threatening wind chill warnings for temperatures as low as -51C (-60F) in western and central Dakota and officials in Indiana – hit by high winds and more than a foot (30cm) of snow – urged residents to stay indoors. –Duncan Barkes

“When America is colder than fucking Siberia, something is terribly, terribly wrong.  Entire weather patterns are being drastically altered on a regular basis. The temperature dropped 50 degrees in 3 HOURS yesterday in New York.  Last year the polar vortex, that’s always supposed to stay in or near the arctic, was cleaved in two and moved south as a result of arctic warming via loss of sea ice. This year, the whole fucking thing moved south in one direction at once. As the climate warms the irreversible feedback loops currently in progress will accelerate. Weather will become less and less predictable and more and more extreme. Meanwhile, at the same time record cold grips North America, record heat is wilting Australia. This is the new normal. The era of stable climate has passed.” -OSJ

Related Story

Polar Vortex: 187 Million Hit By Big Freeze

By James S @ Daily Kos:

If the planet is warming — how can it be so damn cold out there, in the winter?

Well the connections are complex, but they are not unfathomable (to science and physics literates.)
‘Polar vortex’ to blast frigid air over much of US

by Carson Walker, Associated Press; boston.com — Jan 3, 2014

SIOUX FALLS, S.D. (AP) — The weather warnings are dire: Life threatening wind chills. Historic cold outbreak.Winter is normally cold, but starting Sunday tundra-like temperatures are poised to deliver a rare and potentially dangerous sledgehammer blow to much of the Midwest, driving temperatures so far below zero that records will shatter.

One reason?  A “polar vortex,” as one meteorologist calls it, which will send cold air piled up at the North Pole down to the U.S., funneling it as far south as the Gulf Coast.
[…]

Here’s what our current mid-latitude Jet Stream looks likes:

Weather ModelGlobal Jet Stream Wind and 250 mb Pressure (animated loop)


larger

Notice how it has those big ‘loopy waves’  (aka high-amplitude Rossby Waves).  It is the big swoop southward that is ushering in the current frigid polar air.
Arctic Outbreak:  When the North Pole Came to Ohio

by Andrew Freedman, climatecentral.org — Jan 2, 2014

[…]
At the peak of the Arctic outbreak, temperatures may be between 20°F and 40°F below average in large parts of the continental U.S., with dangerous wind chills affecting cities like Minneapolis, Chicago, Cleveland, St. Louis, Washington, D.C., New York, and Boston. The U.S. will have the dubious distinction of experiencing the largest cold temperature anomalies of any land area in the Northern Hemisphere during the height of the biting cold.
[…]The cause of the Arctic outbreak can be traced to northeastern Canada and Greenland, where an area of high pressure and relatively mild temperatures is set to block the eastward progression of weather systems, like an offensive lineman protecting the quarterback from the other team.

The atmospheric blocking is forcing a section of the polar vortex to break off and move south, into the U.S. The polar vortex is an area of cold low pressure that typically circulates around the Arctic during the winter, spreading tentacles of cold southward into Europe, Asia, and North America at times. Except this time, it’s not a small section of the vortex, but what one forecaster, Ryan Maue of WeatherBELL Analytics, called “more like the whole enchilada” in a Twitter conversation on Thursday.
[…]

Computer model projection showing the location of the polar vortex (outlined in orange) and areas of below average temperatures (green and blue) and above average temperatures (orange and red), as indicated by the height of atmospheric pressure levels. The annotations show the cold temperature anomaly in the U.S. and mild anomalies across the Arctic. Credit: WeatherBELL Analytics.

The Arctic Vortex is supposed to stay in the Arctic.  It is supposed to form a tight circle, racing around the pole. It is not supposed to branch out and send frigid polar air to the temperate mid-latitudes.  At least not on a ‘regular basis’.

But then again, unusual stratospheric warming in the Arctic, is not supposed to be breaking that Polar Vortex up into smaller pieces, either.

Just because it’s out of sight, doesn’t mean it should be out of mind.

 

[Note:  most of what follows is analysis of last winter’s arctic events — which are looking remarkably similar to this winter’s arctic events.]


Who says all that record-breaking Arctic Ice Melt really doesn’t matter?

Certainly not well informed meteorologists, because they say it kind of does
Stratospheric Phenomenon Is Bringing Frigid Cold to U.S

by Andrew Freedman, climatecentral.org — Jan 21, 2013

[…]
Sudden stratospheric warming events take place in about half of all Northern Hemisphere winters, and they have been occurring with increasing frequency during the past decade, possibly related to the loss of Arctic sea ice due to global warming. Arctic sea ice declined to its smallest extent on record in September 2012.
[…]Sudden stratospheric warming events occur when large atmospheric waves, known as Rossby waves, extend beyond the troposphere where most weather occurs, and into the stratosphere. This vertical transport of energy can set a complex process into motion that leads to the breakdown of the high altitude cold low pressure area that typically spins above the North Pole during the winter, which is known as the polar vortex.

The polar vortex plays a major role in determining how much Arctic air spills southward toward the mid-latitudes. When there is a strong polar vortex, cold air tends to stay bottled up in the Arctic. However, when the vortex weakens or is disrupted, like a spinning top that suddenly starts wobbling, it can cause polar air masses to surge south, while the Arctic experiences milder-than-average temperatures.
[…]

Ok, what’s a Rossby Wave and how does global warming effect them?  (If you have a low threshold for watching videos, this is the best one of the bunch, imo.)
Jennifer Francis – Understanding the Jetstream (and Rossby Waves)

link to clip

Published on Feb 26, 2013 — by rustneversleeps3

A short review of how the jetstream and Rossby waves work, and some emerging indications that the dynamics may be changing in a warming world.

So, what’s a Polar Vortex, and what happens when it get displaced, by one of those unusually TALL bubbles of relatively warm atmosphere, surging northward?
Polar Vortex

link to clip

Published on Jan 18, 2013 — WTHI-TV
Here’s an meteorological map analysis of various Arctic Vortex splits, what causes them, and what they lead to (… record cold in the Mid-Latitudes).
Stratospheric Warming by The SI Weather

link to clip

Uploaded on Dec 16, 2011 — TheSIWeather
Here’s one meteorological speaker, who’s a bit eccentric, but does seem to have a good grasp on Stratospheric Warming events — going Polar, anyways.
Extreme Event  (Vortex Formation and Displacement)

link to clip

Published on Jan 18, 2013 — TurtleIslandNewsDaily.info

Sudden Stratospheric Warming Split the Polar Vortex in Two.the polar vortex was intact at 50 millibars(height in m) on January 1 to 3.

the polar vortex had broken in two (50millibar heights in m) on January 10 to 13

Finally, here’s a good old-fashioned science satellite composite (it’s a very short clip), that shows what happens when the Polar Vortex, gets nudged into going for ‘a power walk’.
GMAOGEOS-5 Stratospheric Sudden warming Event

link to clip

Published on Mar 4, 2013 —  Harold Saive

http://gmao.gsfc.nasa.gov/…http://gmao.gsfc.nasa.gov/…

And finally here’s an updated 2014 Winter forecast, once again ‘blaming that Polar Vortex’ for ‘deciding’ to go meandering somewhere — that we’d rather not see it go.
WRGX; wtvy.com — January 4, 2014

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Valid 12Z Sat Jan 04 2014 – 12Z Mon Jan 06 2014[…]
Forecast models remain consistent in carrying the polar vortex into the northern tier of the U.S. while carrying it eastward in time.

Many locations may see their temperature readings drop to near record values.
[…]

Incredibly, it may feel as cold as -50 to -60 on Sunday night over sections of the north-central states with the frigid air remaining in place into early next week.

As the vortex shifts eastward, the polar air will begin to affect the Great Lakes and Ohio Valley with temperatures plummeting rapidly.

While the air mass will modify, temperatures will remain downright cold with the forecast high in Chicago, IL being only -11 on Monday.

A strong frontal boundary surging eastward ahead of the polar air mass will become rather active as it intercepts increasing amounts of low-level moisture.
[…]

If only those record-melting Arctic ice packs would stay in place and not keep warming up their supposed-to-be Arctic neighborhoods by exposing all that open sea water — then maybe that Arctic Vortex might not have to ‘go wobbling around like a wildly spinning top — losing its fast-track momentum‘ … at such an ever increasing rate.

But then again, Who needs stable Jet Streams anyways?

Certainly not farmers, not foresters, not ranchers;  Certainly not suburban folks who hate all these crazy arctic deep freezes …  the ones who ask, “Why in the world, is it so damn cold, anyways?”

Now hopefully, you can tell them.

Earth’s Poles Are Shifting Due To Climate Change

In Uncategorized on December 17, 2013 at 6:49 pm

Tugged by our greenhouse gases <i>(Image: Andrew C. Revkin/eyevine)</i>Oldspeak: “Ice melting and sea level change can explain 90 per cent of the [eastward shift]. The driving force for the sudden change is climate change.” -Jinali Chen

“Tick, tick, tick, tick, tick, tick…..” -OSJ

By Anil Ananthaswamy @ New Scientist:

Climate change is causing the North Pole’s location to drift, owing to subtle changes in Earth’s rotation that result from the melting of glaciers and ice sheets. The finding suggests that monitoring the position of the pole could become a new tool for tracking global warming.

Computer simulations had suggested that the melting of ice sheets and the consequent rise in sea level could affect the distribution of mass on the Earth’s surface. This would in turn cause the Earth’s axis to shift, an effect that has been confirmed by measurements of the positions of the poles.

Now, Jianli Chen of the University of Texas at Austin and colleagues have shown that melting due to our greenhouse-gas emissions is making its own contribution to the shift.

The wobble in Earth’s axis of rotation is a combination of two major components, each with its own cause. One is called the Chandler wobble and is thought to arise because the Earth is not rigid. Another is the annual wobble, related to Earth’s orbit around the sun.

Additional wobble

Remove these wobbles, and you are left with an additional signal. Since observations began in 1899, the North Pole has been drifting southwards 10 centimetres per year along longitude 70° west – a line running through eastern Canada.

This drift is due to the changes in the distribution of Earth’s mass as the crust slowly rebounds after the end of the last ice age. But Chen’s team found something surprising. In 2005, this southward drift changed abruptly. The pole began moving eastwards and continues to do so, a shift that has amounted to about 1.2 metres since 2005.

To work out why the pole changed direction, Chen’s team used data from NASA’s GRACE satellite, which measures changes in Earth’s gravity field over time. The data allowed them to calculate the redistribution of mass on Earth’s surface due to the melting of the Greenland and Antarctic ice sheets and mountain glaciers, and the resulting rise in sea level. It correlated perfectly with the observed changes in the mean pole position (MPP).

“Ice melting and sea level change can explain 90 per cent of the [eastward shift],” says Chen. “The driving force for the sudden change is climate change.”

Greenland thaw

Chen’s team calculated that the biggest contribution is coming from the melting of the Greenland ice sheet, which is losing about 250 gigatonnes of ice each year. Another big factor is the melting of mountain glaciers, which contributes about 194 gigatonnes per year. The contribution from Antarctica adds up to 180 gigatonnes per year, but there is considerable uncertainty here because changes in the gravity field due to Earth’s crust rebounding are less well understood over Antarctica than elsewhere.

Since the MPP can be accurately measured using multiple independent techniques, its position and drift can be used to gauge the extent of ice sheet melting, especially in between the end of the ageing GRACE mission and the launch of the next generation of gravity-field-measuring satellites, says Chen.

Jean Dickey of NASA’s Jet Propulsion Laboratory in Pasadena, California, who was not associated with the study, agrees. “It’s a way to monitor climate change by continuing to measure the deviation [of the MPP] from what we have seen in the past,” she says.

Chen presented his findings this week at the annual meeting of the American Geophysical Union in San Francisco.