Science
Scientists unearth when the first humans came to Alberta’s oilsands – Global News
New research may have answered a long-standing mystery by pinning a rough date on the earliest known humans in Canada’s oilsands region.
In a recently published paper, professor Robin Woywitka of Edmonton’s MacEwan University says a combination of archeology and geology has revealed that people were living around Fort McMurray, Alta., at least 11,000 years ago and perhaps as long ago as 13,000 years ago.
“People were in the Fort McMurray area very early,” Woywitka said.
“Fort McMurray has been a nexus for millennia. It’s attracted people forever.”
Scientists have long known the region has a lengthy human history. An archeological site known the Quarry of the Ancestors has yielded millions of artifacts since it was discovered there in the 1990s.
But putting dates to them has been tough.
Standard methods such as radiocarbon dating are out. The area’s acidic soils destroy the organic materials those techniques depend on.
Sometimes, scientists can use sedimentary layers in the earth to date artifacts. But this area has been so stable that there aren’t many places where sediment has been deposited.
So Woywitka and his colleagues tried something new.
They took satellite maps that revealed the surface topography with an accuracy to within a few square metres. They used that information to find sites where sedimentation was most likely to have happened and selected five of them — one of them in the Quarry of the Ancestors.
Sediments from those sites were dated using a technique called infrared stimulated luminescence.
That technique exploits the fact sand grains collect tiny radioactive particles in their pores. Those particles deteriorate at a known rate when exposed to light. So, the longer they’ve been buried, the more particles there will be.
Infrared light causes those particles to release energy. That can then be measured to reveal when the host sand grains were buried, along with the stone tools buried beside them.
In this case, the answer was 12,000 years, give or take a millennium.
“It has more uncertainty than radiocarbon dating, but it’s better than nothing,” Woywitka said.
The findings put those early people right at the start of when that part of the world became livable. The first inhabitants would have moved there within a few centuries after the catastrophic flood that drained glacial Lake Agassiz, a vast inland sea that once covered almost all of what is now Manitoba and half of present-day Ontario.
The date isn’t too long after humans first came to North America, which most archeologists believe happened about 16,000 years ago.
They would have found a landscape very far from the lush boreal forests and teeming wetlands that now cover much of northern Alberta.
“People are dealing with a much different environment than what we see today — open, dry, cold,” Woywitka said. “Probably tundra-y or grassland.”
They probably hunted bison, Woywitka said. Beyond that, there’s little that can be said.
“Whether they came from the north or south, we don’t know.”
Despite the proliferation of artifacts, scientists can’t fit them neatly into the cultural tool kits of other prehistoric people. The presence of materials from other parts of the continent suggest trading networks with other areas, but little is known.
One thing can be said.
Woywitka points out the flood that drained Agassiz exposed both the good toolmaking stone that drew people to the area as well as the oilsands, which have drawn thousands of modern-day inhabitants.
“People came 13,000 ago to get that stuff,” he said. “We go to Fort McMurray today for resources.”
© 2022 The Canadian Press
Keep an eye on the sky this week for a chance to see a planetary hangout.
Five planets — Mercury, Jupiter, Venus, Uranus and Mars — are scheduled to line up near the moon.
WHERE AND WHEN CAN YOU SEE THEM?
The best day to catch the whole group is Tuesday. You’ll want to look to the western horizon right after sunset, said NASA astronomer Bill Cooke.
The planets will stretch from the horizon line to around halfway up the night sky. But don’t be late: Mercury and Jupiter will quickly dip below the horizon around half an hour after sunset.
The five-planet spread can be seen anywhere on Earth, as long as you have clear skies and a west view.
“That’s the beauty of these planetary alignments. It doesn’t take much,” Cooke said.
DO I NEED BINOCULARS?
Maybe. Jupiter, Venus and Mars will all be pretty easy to see since they shine brightly, Cooke said. Venus will be one of the brightest things in the sky, and Mars will be hanging out near the moon with a reddish glow. Mercury and Uranus could be trickier to spot, since they will be dimmer. You’ll probably need to grab a pair of binoculars.
If you’re a “planet collector,” it’s a rare chance to spot Uranus, which usually isn’t visible, Cooke said. Look out for its green glow just above Venus.
DOES THIS HAPPEN OFTEN?
Different numbers and groups of planets line up in the sky from time to time. There was a five-planet lineup last summer and there’s another one in June, with a slightly different makeup.
This kind of alignment happens when the planets’ orbits line them up on one side of the sun from Earth’s perspective, Cooke said.
This visualization shows water features on New York’s Long Island – shown as bright pink splotches. Purple, yellow, green, and dark blue shades represent different land elevations, while the surrounding ocean is a lighter blue. The data was collected on Jan. 21, 2023, by SWOT’s KaRIn instrument. Credit: NASA/JPL-Caltech
The Surface Water and Ocean Topography mission offers the first taste of the detailed perspectives of Earth’s surface water that its cutting-edge instruments will be able to capture.
The international Surface Water and Ocean Topography (SWOT) mission – led by NASA and the French space agency Centre National d’Études Spatiales (CNES) – has sent back some of its first glimpses of water on the planet’s surface, showing ocean currents like the Gulf Stream in unprecedented detail. SWOT is also capturing views of freshwater features such as lakes, rivers, and other water bodies down to about 300 feet (100 meters) wide.
The satellite will measure the elevation of nearly all the water on Earth’s surface and provide one of the most comprehensive surveys yet of our planet’s surface water. SWOT’s measurements of freshwater bodies and the ocean will provide insights into how the ocean influences climate change and the water cycle; how a warming world affects water storage in lakes, rivers, and reservoirs; and how communities can better manage their water resources and prepare for floods and other disasters.
“SWOT’s advanced imagery will empower researchers and advance the way we manage fresh water and the effects of sea level rise across the globe,” said NASA Administrator Bill Nelson. “Water is one of our planet’s most important resources – and it’s proven to be vulnerable to the impacts of climate change. SWOT will provide critical information that communities can use to prepare for the impacts of a warming climate.”
A Whole New View
As seen in these early images, on Jan. 21, 2023, SWOT measured sea level in a part of the Gulf Stream off the coast of North Carolina and Virginia. The two antennas of SWOT’s Ka-band Radar Interferometer (KaRIn) instrument acquired data that was mapped as a pair of wide, colored strips spanning a total of 75 miles (120 kilometers) across. Red and orange areas in the images represent sea levels that are higher than the global average, while the shades of blue represent sea levels that are lower than average.
For comparison, the new data is shown alongside sea surface height data taken by space-based instruments called altimeters. The instruments – widely used to measure sea level – also bounce radar signals off of Earth’s surface to collect their measurements. But traditional altimeters are able to look only at a narrow beam of Earth directly beneath them, unlike KaRIn’s two wide-swath strips that observe sea level as a two-dimensional map.
The spatial resolution of SWOT ocean measurements is 10 times greater than the composite of sea surface height data gathered over the same area by seven other satellites: Sentinel-6 Michael Freilich, Jason-3, Sentinel-3A and 3B, Cryosat-2, Altika, and Hai Yang 2B. The composite image was created using information from the Copernicus Marine Service of ESA (European Space Agency) and shows the same day as the SWOT data.
KaRIn also measured the elevation of water features on Long Island – shown as bright pink splotches nestled within the landscape. (Purple, yellow, green, and blue shades represent different land elevations.)
“Our ability to measure freshwater resources on a global scale through satellite data is of prime importance as we seek to adjust to a changing climate,” said CNES Chairman and CEO Philippe Baptiste. “In this respect, the first views from SWOT give us a clearer picture than ever before. These data will prove highly valuable for the international scientific community in the fields of hydrology, oceanography, and coastal studies.”
This initial inland image is a tantalizing indication of how SWOT can measure details of smaller lakes, ponds, and rivers in ways that satellites could not before. Such data will be used to produce an extraordinary accounting of the freshwater on Earth’s surface in ways useful to researchers, policymakers, and water resource managers.
“The KaRIn instrument took years to develop and build, and it will collect information on bodies of water across the globe – data that will be freely and openly available to everybody who needs it,” said Parag Vaze, SWOT project manager at NASA’s Jet Propulsion Laboratory in Southern California.
More About the Mission
Launched on Dec. 16, 2022, from Vandenberg Space Force Base in central California, SWOT is now in a period of commissioning, calibration, and validation. Engineers are checking out the performance of the satellite’s systems and science instruments before the planned start of science operations in summer 2023.
The data for these first images was collected by SWOT’s KaRIn instrument, the scientific heart of the satellite. KaRIn has one antenna at each end of a boom that’s 33 feet (10 meters) long. This enables the instrument to look off to either side of a center line directly below the satellite as it bounces microwave signals off Earth’s surface. The returning radar signals arrive at each antenna slightly out of sync, or phase, from one another. When these signals are combined with other information about the antennas and the satellite’s altitude, scientists will be able to map the height of water on Earth’s surface with never-before-seen clarity. KaRIn encountered an issue earlier this year with one of its subsystems; engineers have now resolved the situation, and the instrument is up and running.
SWOT was jointly developed by NASA and CNES, with contributions from the Canadian Space Agency (CSA) and the UK Space Agency. JPL, which is managed for NASA by Caltech in Pasadena, California, leads the U.S. component of the project. For the flight system payload, NASA provided the KaRIn instrument, a GPS science receiver, a laser retroreflector, a two-beam microwave radiometer, and NASA instrument operations. CNES provided the Doppler Orbitography and Radioposition Integrated by Satellite (DORIS) system, the dual frequency Poseidon altimeter (developed by Thales Alenia Space), the KaRIn radio-frequency subsystem (together with Thales Alenia Space and with support from the UK Space Agency), the satellite platform, and ground operations. CSA provided the KaRIn high-power transmitter assembly. NASA provided the launch vehicle and the agency’s Launch Services Program, based at Kennedy Space Center, managed the associated launch services.
To learn more about SWOT, visit: https://swot.jpl.nasa.gov/
The Earth witnessed a powerful solar storm in nearly six years, causing auroras all over the US, the National Oceanic and Atmospheric Administration (NOAA) said. NOAA had earlier announced moderate G2 storm and G3 conditions between March 23 and 25, but updated it to G4. A severe G4 storm can affect the power grid system with possible widespread voltage control problems; and spacecraft operations with increased possibility of surface charging, and atmospheric drag risk on Low Earth Orbiting (LEO) satellites.
Commercial real estate is in trouble. Why you should be paying attention – CNN
Planets on parade: 5 will be lined up in night sky this week – Ottawa.CityNews.ca
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