Connect with us

Environment

In pictures: The secrets of Greenland’s ice sheet

Published

on

Diana Ibáñez López takes a look at Greenland’s ice sheets, the secrets they hold and how scientists have unlocked them over decades of research.

This article was originally published on Timeline. To download the Timeline app click here.

The Brief

Scientists were aghast when in 2006 a lake with 4,000 Olympic swimming pools’ worth of water disappeared into Greenland’s ice sheet in just two hours. In June 2015, after nearly a decade of research, they worked out why it happened: When the lake’s drainage system backs up, the ice sheet cracks all over briefly, evacuating the water to the sea. 

A preacher realized 250 years ago that Greenland’s ice was full of secrets — including the key to understanding Earth’s climate history. Ever since, researchers have been fascinated by how the ice sheet shifts, changes and melts.  

Three times the size of Texas and over 3 kilometers thick in places, the ice sheet contains enough water to raise the oceans by 6 meters. And as the world warms it is melting faster than ever before. How have researchers explored this Arctic expanse, and what have they discovered there?

1761—1762 – Missionary studies ice, inspires climatology

Old Nuuk, Greenland

Protestant missionary David Cranz became fascinated with ice when he spent a year preaching to Eskimo tribes. It’s not surprising: Greenland, the biggest island in the world, is almost entirely “glazed,” as Cranz put it.

Map of Greenland © US Geological Survey, 1976

Cranz wanted to know how the ice was formed and why it “dissolved” again. His observations of glaciers laid the groundwork for future surveys and early climatologists, who realized that this ancient ice was a logbook for Earth’s climate.

Twelve summers logged in a 19-centimeter section of ice.

1848—1852 – Scientist maps Greenland, discovers Inland Ice

Disko Bugt, Greenland

Disko Bugt, GreenlandDanish geologist Hinrich Rink tried to map all Greenland’s glaciers. He created the first record of the ice margin and gave the vast, unexplored interior a name: Indlandsisen — “Inland Ice.

Lithograph of the ice margin © Hinrich Rink, 1850

Rink’s work caused a splash, giving credence to the theory of Ice Ages at a time when most people attributed changes in the climate to the stars. He sparked a trend in glacier research, and even has one named after him.

The Rink glacier flows from the Inland Ice into Baffin Bay. © NASA

July 1875 – Timing the world’s fastest glacier

Ilulissat Icefjord, Greenland

Glaciers are known to move, a bit. Norwegian geologist Amund Helland wanted to know how fast, so he measured the glacier front near the west coast trading town Ilulissat. As it happens, this glacier drains into the world’s fastest ice stream, currently moving 19 meters a day.

Movement of the Sermeq Kujalleg glacier front

In 2004 the Ilulissat Icefjord was declared a UNESCO World Heritage site, but this doesn’t mean it won’t change. The glacier retreats in summer and grows in winter, but since it was first mapped in 1850, it has shrunk by about 40 kilometers.

Glacier front © Greenland Travel. CC

May 1888—May 1889 – Zoologist crosses ice sheet on skis, proves its existence

Puissortoq, Greenland

Fridtjof Nansen needed a break after handing in his Ph.D. on the nervous system of the hagfish, so he set off to ski across Greenland. Nansen’s trip was the first to cross the Inland Ice, proving that it extended from coast to coast without interruption.

Fridtjof Nansen in Arctic gear © Henry van der Weyde: National Library

After the crossing, the team, which included local Greenlanders, wintered at a coastal camp. There Nansen studied Inuit culture, inspiring later explorer-ethnographers such as Knud Rasmussen.

Nansen’s team

1935—1936 – Brits travel to Greenland to watch the weather

Kangerdlugssuak, Greenland

A yearlong expedition led by explorer Augustine Courtauld and geologist Lawrence Wager set out to take meteorological readings three times a day and keep track of rainfall. They found plenty to do besides: The team studied the ozone layer, the aurora, the earth’s magnetism…and went on long, rugged walks.

Crossing a ravine in the ice sheet © General Photographic Agency: Getty

The readings were transmitted back to the UK and included in the weather forecasts. This was also the period ofthe first aerial photography, which opened up the Inland Ice to detailed surveying.

Inland Ice photographed from a plane © Børge Fristrup

1948—1953 – French explorer ushers in modern glaciology

Eqip Sermia glacier, Greenland

French explorer Paul-Émile Victor also set out to take measurements. The task he set his team was huge: recording the profile of the underside of the Inland Ice, to work out just how massive the ice covering Greenland was.

Paul-Émile had crossed the Inland Ice in 1934.

Like Nansen’s, this expedition revolutionized Arctic travel, introducing parachutes and motorized convoys with tracks — equipment probably left over from World War II.

1964—1966 – First ice cores give a glimpse of the past

Inland Ice, Greenland

Ice cores are samples of exceptionally well-preserved sections of the ice sheet that have suffered no melt. The oldest, drilled out of Greenland ice, goes back 123,000 years.

Borehole © Joe Raedle: Getty

These giant ice-lollies capture Earth’s climate history, showing details such as snowfalls and temperatures in year-by-year layers.

Freshly harvested ice core © Jay Kyne, IDDO

1968—1976 – Ice-penetrating radar reveals another landscape

Inland Ice, Greenland

The task the French expedition took on with tanks, parachutes and sketches was completed by the US army using radar that could look through 3 kilometers of ice.

© Gordon Hamilton, via polarfield.com

This led to the creation of the first accurate topography beneath the Inland Ice. Radar scans have continued for decades, and in 2013 they revealed the world’s longest canyon hidden beneath the ice.

The 750-km long canyon serves as drainage for the ice sheet. © J. Bamber, University of Bristol

1993—2013 – Soil tests show when Greenland was last green

Idaho, US

An ice core from deep in the Inland Ice showed that the last time Greenland was completely ice-free was over 2.5 million years ago. This means that the heart of the world’s second-largest ice sheet has been in place since then, despite large variations in climate. It also gives us a better idea of how much warming Greenland can endure before its ice melts completely.

Ice core with soil sediment © Paul Bierman, University of Vermont

March 2002 – Satellite takes over from aerial photography, shows growth

800 kilometers above Earth

Envisat was launched to monitor the Earth’s atmosphere and measure changes in the oceans, land surface and ice. The data refined the map of Greenland’s ice sheet, showing 6 centimeters of growth per year on the Inland Ice. The coastal regions of the ice, however, continue to melt ever faster.

Envisat image of the coast of Greenland © ESA:AFP-Getty

July 8—12, 2012 – ‘Extreme surface melt’

Pasadena, CA, US

A NASA scientist saw, in satellite images, that about 40% of Greenland’s ice sheet thawed at the surface. He thought it must be data error, but two other observatories confirmed the melt. Four days later, the Inland Ice was 97% thawed.

July 8 (left) and July 12 (right). The melt zone is shown in red. © NASA

On average, half the surface ice melts in a summer. But this speed melt wasn’t entirely unnatural: ice core analysis shows melt events happen in Greenland every 150 years or so. The last one was in 1889, so this one was roughly on schedule.

Meltpond © NASA

March 2009—2016 – Operation IceBridge maps the ice sheet in 3D

Greenland

This ongoing NASA mission aims to survey all of the Earth’s polar ice from the air, then create a 3D model of both the Arctic and Antarctic ice sheets,  including all of their interior layers.

A 3D animation of the operation shows radar penetrating the ice. © NASA

NASA wants to know how the hidden landscape affects ice movement, in order to better understand the interplay between climate and melting.

Radar image of ice layers and bedrock © Theresa Stumpf, CReSIS

May 6—July 8, 2013 – Solar rover tests the ice

Summit Station, Greenland

Equipped with ice-penetrating radar, NASA’s GROVER rover has a mission similar to the 18th-century missionary who became fascinated with ice: to find out how the ice sheet was formed and predict when it might melt.

© NASA

GROVER is solar-powered, a good pollution-free option in the Arctic summer, where the sun never sets. The rover was based at Summit Station, a popular year-round research camp.

Camp at Summit Station © Joe Raedle:Getty

June 2015 – Disappearing lakes reveal ice sheet plumbing system

North Lake, Greenland

Lakes on the ice sheet have been draining mysteriously fast. First spotted in July 2006, when a 5-square-kilometer lake vanished in two hours, the science behind the phenomenon remained an enigma for years. Scientists feared the water could lubricate the ice sheet: If the whole thing slid into the ocean, it would raise the global sea level by 6 meters and cause catastrophic flooding.

© Joe Raedle:Getty

To se what was going on, researchers rigged the ice with GPS. As the lake filled up (and disappeared) again, they discovered a rapid draining system: When the ice sheet’s natural plumbing is at full capacity, water beneath the ice pushes a huge block up. It floats out of place, creating a hydrofracture — multiple cracks under the lake — through which the lake drains at speed.

North Lake regularly drains the equivalent of 4,000 Olympic swimming pools © Peter Prokosch, GRID-Arendal

The cracks close when the block settles back into place, and the lake returns to a normal plumbing rhythm through a single vertical river.

Photo: Neil and Kathy Carey via Flickr

Further reading:

Will carbon trading save the world?

Vast ice structures discovered beneath Greenland ice sheet

Huge canyon discovered under Greenland ice

Carbon prices should increase up to 200% to avoid tipping point, says study

Greenland ice melt and sea level rise ‘greatly underestimated’

Environment

Road Trip! How to Choose the Greenest Vehicle for Your Growing Family

Published

on

Greenest Vehicle
Licensed Image by Shutterstock - By Mascha Tace -- https://www.shutterstock.com/g/maschatace

When you have a growing family, it often feels like you’re in this weird bubble that exists outside of mainstream society. Whereas everyone else seemingly has stability, your family dynamic is continuously in flux. Having said that, is it even possible to buy an eco-friendly vehicle that’s also practical?

What to Look for in a Green, Family-Friendly Vehicle?

As a single person or young couple without kids, it’s pretty easy to buy a green vehicle. Almost every leading car brand has eco-friendly options these days and you can pick from any number of options. The only problem is that most of these models don’t work if you have kids.

Whether it’s a Prius or Smart car, most green vehicles are impractical for large families. You need to look for options that are spacious, reliable, and comfortable – both for passengers and the driver.

5 Good Options

As you do your research and look for different opportunities, it’s good to have an open mind. Here are some of the greenest options for growing families:

1. 2014 Chrysler Town and Country

Vans are not only popular for the room and comfort they offer growing families, but they’re also becoming known for their fuel efficiency. For example, the 2014 Chrysler Town and Country – which was one of CarMax’s most popular minivans of 2017 – has Flex Fuel compatibility and front wheel drive. With standard features like these, you can’t do much better at this price point.

2. 2017 Chrysler Pacifica

If you’re looking for a newer van and are willing to spend a bit more, you can go with Chrysler’s other model, the Pacifica. One of the coolest features of the 2017 model is the hybrid drivetrain. It allows you to go up to 30 miles on electric, before the vehicle automatically switches over to the V6 gasoline engine. For short trips and errands, there’s nothing more eco-friendly in the minivan category.

3. 2018 Volkswagen Atlas

Who says you have to buy a minivan when you have a family? Sure, the sliding doors are nice, but there are plenty of other options that are both green and spacious. The new Volkswagen Atlas is a great choice. It’s one of the most fuel-efficient third-row vehicles on the market. The four-cylinder model gets an estimated 26 mpg highway.

4. 2015 Hyundai Sonata Hybrid

While a minivan or SUV is ideal – and necessary if you have more than two kids – you can get away with a roomy sedan when you still have a small family. And while there are plenty of eco-friendly options in this category, the 2015 Hyundai Sonata Hybrid is arguably the biggest bang for your buck. It gets 38 mpg on the highway and is incredibly affordable.

5. 2017 Land Rover Range Rover Sport Diesel

If money isn’t an object and you’re able to spend any amount to get a good vehicle that’s both comfortable and eco-friendly, the 2017 Land Rover Range Rover Sport Diesel is your car. Not only does it get 28 mpg highway, but it can also be equipped with a third row of seats and a diesel engine. And did we mention that this car looks sleek?

Putting it All Together

You have a variety of options. Whether you want something new or used, would prefer an SUV or minivan, or want something cheap or luxurious, there are plenty of choices on the market. The key is to do your research, remain patient, and take your time. Don’t get too married to a particular transaction, or you’ll lose your leverage.

You’ll know when the right deal comes along, and you can make a smart choice that’s functional, cost-effective, and eco-friendly.

Continue Reading

Environment

How Climate Change Altered this Engineer’s Life

Published

on

how climate change affect our lives
Shutterstock Licensed Photo - By Rawpixel.com -- https://www.shutterstock.com/g/rawpixel

Living the life of an engineer likely sounds pretty glamorous: you are educated and highly regarded, typically have high paying gigs, and with the breadth of knowledge and array of fields of specialty, your possibility for jobs is usually immense.  But what if there was something else that needed your attention? Something bigger than just being an engineer, going to work every day and doing the same technical tasks typically associated with the profession?

For Kevin McCroary, that is exactly how it played out.  A successful engineer, gainfully employed in a prosperous job, a simple trip to the Philippines made him see that there was a bigger issue at hand than using his engineer training in a traditional profession.  This bigger issue was that of climate change.  And working as a volunteer for underprivileged children in the Philippines, he saw first-hand the extensive pollution and poverty that existed here and that impacted the livelihood of these kids and their families.

Upon returning home, from his trip to the Philippines he had a new perspective of the impact we as individuals and as humanity have on the earth, and more than that Kevin wanted to know more.  He started to do some research and study these human-environmental interactions, and shortly thereafter ended up in Greenland.  There, he spoke to a man who had lost his home in a tsunami, and, who, through consistent weather tracking could indeed confirm that the current weather trends were “strange:” there was undeniably a general warming tendency happening in the arctic, causing an array of negative effects.

The combination of these observations, as well as his own research, led Kevin to conclude that something had to be done.  With that in mind, he launched his project Legend Bracelet.  The mission is simple: create a reminder of the legacy we are leaving behind.  As individuals and as humanity, we are leaving behind an imprint on the earth, and the magnitude of it is something that needs to be brought to the forefront of public awareness.  The idea is to have a bracelet that can serve as a daily reminder of the impact on the earth that each of us can have every day, regardless of how big or small.  The bracelet has two capsules: the first is filled with sand or earth, and the second is empty.  As the owner, you are to fill the empty one with your own earth, carrying it with you as a reminder and symbol of your connection and commitment to helping look after our environment.

We are all impacted by climate change, and we all have a responsibility to help.  And it can start with something as simple as putting on a bracelet.  Support Kevin on his Kickstarter campaign for Legend Bracelet, tell others about it, or take action in your own way and play your part in slowing down the effects of climate change.  You may think “but I’m just one person!” You are indeed.  But so is he.  Every change starts with one.

Continue Reading
Advertisement

Facebook

Trending