Glaciologists have been closely monitoring ice shelves in Antarctica for signs of cracks and chasms that indicate breakups. The loss of ice around the Earth’s polar regions is one of many consequences of climate change, which is leading to rising ocean levels and various feedback mechanisms. Recently, the ESA’s Copernicus Sentinel-1 satellite witnessed a giant iceberg breaking off from Antarctica’s Brunt Ice Shelf on February 26th.
The Copernicus Sentinel mission consists of two polar-orbiting satellites that rely on C-band synthetic aperture radar imaging to conduct Earth observations in all weather conditions. In recent years, it has been monitoring the Brunt Ice Shelf for signs of cracks and chasms. According to the images it recently captured, an iceberg larger than New York City broke free and began floating out to sea.
Continue reading “Another Big Iceberg Just Broke off from Antarctica”
The words “snow” and “Hawai’i” are not often mentioned in the same paragraph – or even on the same vacation. But snow does fall in Hawai’i almost every year, and 2021 has seen a deep cold front drop snow on the summits of Mauna Loa and Mauna Kea on the Big Island at least three times in the past few weeks – as well as on Haleakala on Maui. This means there are currently in snowcaps on Hawai’i’s three tallest mountains.
Continue reading “Three Storms Have Dumped Snow on Mauna Loa and Mauna Kea”
Those lucky few who have the incredible opportunity to see the Earth from space often report the view gives them a sense of awe, unity and clarity. This perspective-altering experience has come to be known as the Overview Effect, from a book by the same name published 1987 by space philosopher Frank White.
Continue reading “This is the View You Get Staring out of the Space Station’s Cupola Module”
Satellite engineers know what every photographer knows: get close to your subject to get better pictures. Not just visible light pictures, but all across the spectrum. The lower altitude also improves things like radar, lidar, communications, and gps.
But when your subject is Earth, and Earth is surrounded by an atmosphere, getting closer is a delicate dance with physics. The closer a satellite gets to Earth, the more atmospheric drag it encounters. And that can mean an unscheduled plummet to destruction for Earth-Observing (EO) satellites.
Continue reading “Earth Observation Satellites Could be Flown Much Lower than Current Altitudes and Do Better Science”
One under-appreciated space asset is the photography skills of the Russian cosmonauts on board the International Space Station. They are extremely skillful photographers who don’t get the same recognition as their astronaut counterparts in their Earth observation skills. In particular, they have taken some stunning high-oblique shots of objects close to the horizon, with almost an 3-D effect.
Continue reading “Mount Everest, Seen from Space!”
One day, my Grade Nine science class got way more interesting.
Suddenly, volcanoes weren’t just something in textbooks. Though I was in neighbouring British Columbia when Mt. St. Helens erupted, there was still a layer of ash on our cars and everything else. For a teenager with a burgeoning interest in science, it was awesome.
Continue reading “40 Years Ago, Mount St. Helens Blew its Top Off”
Rejoice! If you’ve missed your daily fix of seeing views of our rotating Earth from space, NOAA announced that its Deep Space Climate Observatory (DSCOVR) is now back in action. The deep space satellite, which produces incredible full-disk images of our Blue Marble, has been offline since June 27, 2019 because of a problem with the spacecraft’s attitude control system. But NOAA and NASA engineers developed and uploaded a software patch to restore DSCOVR’s operations.
Continue reading “Phew, Earth-Watching DSCOVR is Operational Again”
A surtseyan eruption is a volcanic eruption in shallow water. It’s named after the island Surtsey, off the coast of iceland. In 2015, a surtseyan eruption in the Tongan Archipelago created the island Hunga Tonga-Hunga Ha‘apai. Despite the odds, that island is still there almost five years later.
Continue reading “A Brand New Island in the Pacific has Survived 5 Years”
As global warming ramps up, expect to see Greenland in the news a lot. That’s because its ice sheet is under threat of melting. But that’s not the only reason. The other reason is fire.
Continue reading “There’s A Fire in Greenland… Again. It’s 10 Degrees Hotter Than Normal”
The rate at which Greenland is losing its ice is accelerating. This unsurprising conclusion comes from a new study based on 25 years of satellite data from the European Space Agency. The new study was published in Earth and Planetary Science Letters.
Continue reading “Ice loss in Greenland is Accelerating”