Greenland glaciers, which were once covered with snow and ice, are starting to look increasingly barren. A new crop of NASA satellite images captures the stark transformation of glaciers that feed into the Sermilik Fjord, comparing the area's formerly ice-covered surface from 50 years ago to today's decidedly rockier appearance today.
- ‘Extraordinary thinning’ of ice sheets revealed deep inside Antarctica.
- Highlander Mine - Season 1 - Episode 9!
- Melting Glaciers - Glacier National Park (U.S. National Park Service).
- Visualizing the Change;
- a Dark Tale.
There are scores of examples of change just in this one area. According to NASA, the differences in color between the two images indicate that the surface of the glacier has melted. The process, they say 'concentrates dust and rock particles and leads to a darker recrystallized ice sheet surface.
Images taken of Helheim also appear to show warm water accumulating on the glacier's top surface. NASA says an unusual spike in temperatures is to blame for the phenomena. As previously reported, Greenland lost a mind-bending 11 billion tons of ice in just one day -- a disconcerting feat recorded by scientists last month. The melt of Greenland's ice sheet is one of the more visible signs of man-made climate change spurred by the burning of fossil fuels, and has contributed to a rapid sea level rise which puts many coastal areas at risk.
Greenland has been the epicenter of glacial melt, with billions of tons of ice pouring into the ocean which threaten to raise sea levels across the globe. If the entire Greenland ice sheet melted, it could add 20 feet or more to global sea level, experts warn.
Alerts In Effect
Sutherland, an oceanographer at the University of Oregon. Unstable tidewater glaciers such as the one the team measured flow into the sea relatively quickly and calve, or spit off icebergs, often. Although these glaciers tower above the ocean, most of the melting action happens beneath the waterline. Rising temperatures increase surface melting; scientists expect more meltwater will trickle down as the climate warms, exacerbating this process and ultimately threatening coastal cities around the world.
Sea Levels Might Rise Because of This Unstable Glacier | Time
Getting accurate readings of glacier melt is critical to predicting future sea-level rise with any meaningful precision. The sonar data revealed seasonal differences, with higher melt rates in August than in May, as well as changes in where melt occurred.
- The Nature of People;
- Read More From TIME;
- How would sea level change if glaciers melted?.
- GLIMS Glacier Database?
- The Keepers Journal: Book V of The Larkin Legacy.
- Glaciers and climate change | National Snow and Ice Data Center.
In May rates were higher on the top of the glacier; in August they were higher along the bottom, deep below the waterline. As the summer sun beat down, more meltwater flowed beneath the glacier and into the ocean, pushing the relatively warm seawater against the submerged face of the glacier and melting it.
Warm Water Is Melting Glaciers 100 Times Faster Than We Thought
This process causes the glacier to become top-heavy and thus more likely to calve. It is a vicious cycle: as more ice cleaves into the sea, there is less friction to keep the glacier from sliding farther into the water—and it therefore melts faster. Sutherland and his colleagues also noticed variations across the face of the glacier, which suggested melt rates were higher than they had expected in places besides where the meltwater flows into the ocean.
Melting Glaciers. Grinnell Glacier and Morton J.
Item is in your Cart
Elrod, K. Ross Toole Archives, In , the park had 35 named glaciers large enough to be considered active. By , only 26 named glaciers remained. The average area reduction was 39 percent, though some lost as much as 85 percent.
This trend of glacier retreat is expected to continue as temperatures rise. Glaciers shrink when summer melting outpaces winter snow.
The Ice Is Melting Even Faster Than They Thought
Despite occasional big winters or frigid months, the glaciers are melting as long term average temperatures increase. In the past century, human activities have emitted a significant amount of carbon dioxide, which is causing the Earth to heat up—and glaciers to melt.
Geological Survey. Elrod photographing Chaney Glacier in They found many images to work with from early photographers such as Morton Elrod, T. Hileman, Ted Marble, F. Matthes, and others who scoured the park to publicize its beauty and earn their livings. The USGS scientists then hiked the historic images into the field to rephotograph them from the exact same vantage point. Historically and today, photographing the glaciers can only occur in a narrow window in late August and early September after the previous winter's snow has melted from the ice and before the first snows of autumn.
It is only in the late summer season that the glaciers can be clearly seen. Jackson Glacier and Although melting glaciers are the most visible indicators of climate change in the mountains, the entire mountain ecosystem is responding. Using both repeat photography and tree-ring studies, scientists have documented that trees are growing faster, becoming taller and filling in the spaces in between trees.
Young seedlings have established and are surviving in areas where deep snowpack and harsh weather conditions had previously excluded them. How do you think this vegetation change will impact wildlife? Blackfoot and Jackson Glacier and Stebinger, GNP Archives, Jackson Glacier was once part of Blackfoot Glacier, one of the largest glaciers in the park.
By the expanse of Blackfoot Glacier had receded and separated into two distinct basins, giving rise to the separate names of Jackson and Blackfoot glaciers. Along with the glacial recession evident from this pair, can you pick out another big change? Boulder Glacier and Jerry DeSanto, K.
Related Glaciers Are Melting!, The
Copyright 2019 - All Right Reserved