Landsat 8 is the United States Geological Survey’s most recently launched satellite, and it holds the powerful Operational Land Imager (OLI.) The OLI is a powerful multi-spectral imager with a wide dynamic range.
The OLI does a great job of keeping an eye on Earth, and now its captured images of winds in Namibia picking dust up and carrying it out over the Atlantic Ocean.
One of the benefits of the Space Age is the way it has allowed human beings to see Earth in all of its complexity and splendor. In addition, it has allowed us to conduct studies of Earth’s surface and atmosphere from orbit, which helps us to see the impact we have on our the planet. It is with this purpose in mind that NASA’s Earth Observation Program has been monitoring the Arctic and Antarctic for many years.
For instance, Operation IceBridge has spent much of the past decade monitoring the Antarctic ice sheet for signs of cracks and flows. The purpose of this is to determine how and at what rate the ice sheet is changing due to Climate Change. Recently, NASA crews conducted a flight over the southern Antarctic Peninsula as part of Operation IceBridge ninth year, which resulted in some stunning pictures of the icy landscape.
The flight took place on November 4th, 2017, as part of IceBridge’s “Endurance West” mission to study sea ice. The path they chose follows the ground track of NASA’s Ice, Cloud, and land Elevation Satellite-2 (ICESat-2), an ice-mapping satellite that is scheduled for launch in late 2018. This path began at the northern tip of the Antarctic Peninsula and then moved southward across the Weddell Sea.
The images the crew took aboard their P3 research plane were captured by a Digital Mapping System, a downward-pointing camera that collects thousands of high-resolution photographs during a single flight. While traveling over the southern Antarctic Peninsula, they imaged a landscape that resembled rapids, where the motion of rivers becomes amplified as the water flows through steeper, narrower terrain.
In a similar fashion, as ice flows through narrower canyons and down steeper bedrock, more fractures appear at the surface. But of course, the rate at which this takes place is much slower, which can make discerning movement in the ice sheet rather difficult. The first image (shown above) shows ice flowing into the southern part of the George VI ice shelf, which is located in Palmer Land south of the Seward Mountains.
In this location, cracks are likely to be a regular feature that form as the ice flows over the bedrock. However, since the ice flow is relatively slow (even on the steeper part of the bedrock), the surface cracks are not as dramatic as in other regions. For example, the second image (shown below), which shows a heavily crevassed glacier that measures about 21 km (13 mi) long and 11 km (7 mi) wide.
The glacier appears to be flowing west from the Dyer Plateau to George VI Sound while the north side merges with the Meiklejohn Glacier. The third image (bottom) shows a heavily crevassed glacier north of Creswick Peaks that also flows west into George VI Sound. In short, the pictures confirm that ice on the southern end of the Antarctic Peninsula is flowing towards the ocean.
The purpose of IceBridge, which has been conducting regular measurements in the Antarctic Peninsula since 2009, has been to study just how fast and to what extent Climate Change has been impacting the region. While ice sheet loss is a well-documented phenomenon, scientists have known for some time that the most dramatic losses in Antarctica occur along its western side.
In addition, research has shown that the southern part of the peninsula is particularly vulnerable, as the glaciers and ice shelves there have become destabilized and are slowly feeding into the sea. And unlike sea ice, the land ice in this region has the potential to raise sea levels around the world. As Michael Studinger, the project manager for IceBridge, describes the operation:
“IceBridge exists because we need to understand how much ice the Greenland and Antarctic ice sheets will contribute to sea level rise over the next couple of decades. In order to do this, we need to measure how much the ice surface elevation is changing from year to year.”
Knowing how significant the impact of Climate Change will be is the first step in developing countermeasures. It also serves as a stark reminder that the problem exists, and that solutions need to be found before it is too late.
Yes, its been a snowy, icy winter in parts of the US, Canada and Europe and these satellite images look about as miserable as it’s felt for some of us. And no, those aren’t icicles hanging off the coast of Maine and Nova Scotia; those are called ‘cloud streets,’ which are long parallel bands of cumulus clouds that form when cold air blows over warmer waters (like the ocean) and a warmer air layer (temperature inversion) rests over the top of both.
But don’t let the recent cold weather and snow fool you. The Earth as a whole continues to warm, and NASA and NOAA announced today that their analysis puts 2014 as Earth’s warmest year since 1880. 2014 was the 38th straight year with above average global annual temperatures, and December 2014 was the hottest December on record. Additionally, 6 of the 12 months last year set heat records. Even though you might feel cold right now, the last time there was a monthly average global temperatures that set a record for cold was in 1916.
OK, now back to the regularly scheduled feeling sorry for ourselves for the recent cold, snowy weather… see more satellite images below.
Here’s a video from NASA about the latest findings on Earth’s changing climate: