Global temperature records set in
2015 – the hottest year so far – may become the new norm by 2025 if carbon
emissions continue to rise at the same rate. Human activities have already
locked in this new ‘normal’ for future temperatures but immediate climate action
could prevent record extreme seasons year after year. If we don’t reduce our
rate of emissions, the record hot summer of 2013 in Australia - when we saw
temperatures approaching 50 degrees Celsius in some areas – could be just
another average summer season by 2035. So, what is the idea of a new normal? Researchers
determined that a new normal occurred when at least half of the years following
an extreme year were cooler and half warmer. Only then can a new normal state
be declared. This process was also used to determine new normal conditions for
seasonal and regional changes to the climate. Using the ANU’s National
Computational Infrastructure supercomputer to run climate models, the
researchers explored when new normal states would appear under the
Intergovernmental Panel for Climate Change’s four emissions pathways. The results
revealed that while global average temperatures would inevitably enter a new
normal under all emissions scenarios, this was not the case at seasonal and
regional levels. Researchers found that with prompt action to reduce greenhouse
gases, a new normal might never occur in the 21st century at
regional levels during the southern hemisphere summer and northern hemisphere
winter.
Monday, 14 November 2016
Water Found On Metallic Asteroid
Scientists have detected the
presence of water on Psycho, a largest metallic asteroid in our solar system
and the target of a proposed NASA mission. New observations from the NASA
Infrared Telescope Facility in Hawaii show evidence of water or hydroxyl on its
surface. While the source of these molecules on Psycho remains a mystery,
Joshua Emery, from the University of Tennessee, said that water-rich minerals
detected on the asteroid might have been delivered by carbonaceous asteroids
that impacted Psyche in the distant past.
A Battery Made From Junkyard Metal
Researchers have developed a new
high-performance, grid-scale battery made from metal scrap and common household
chemicals. The battery, which is the size of a pill bottle, can withstand the
equivalent of 13 years of daily charging and discharging while retaining 90% of
its capacity. Researcher said that the battery was powerful and easy to build. Researchers
were inspired from an ancient technology called the Baghdad Battery, which dates
to the first century BC. It consisted of a terracotta pot, a copper sheet and
an iron rod along with some trace chemicals that could have been an
electrolyte. The team soaked metal in a jar with a solution of water and salt. They
then applied a voltage to induce a process called anodisation, which
restructures the nanoscopic composition of a metal. That exposes the metal’s
interior surface and makes it more receptive to storing and releasing energy. Researchers
placed a barrier between the two pieces of metal and submerged it in an
electrolyte solution made from water and potassium hydroxide. When connected by
wires to a device that generated a current, their contraption worked like a car
battery.
Ebola Virus Mutated To Better Infect Humans
The Ebola virus may have adapted to
better infect human cells, say scientists who identified mutations in the
deadly virus that developed during the recent epidemic in West Africa. More than
28,000 people have been infected with the virus and more than 11,000 people
died from the disease. To study whether the virus might have changed
genetically in response to infection of such large numbers of people, the
researchers used Ebola virus gnomic sequences to track virus mutations. They found
that mutations of the gene that encodes the Ebola virus glycol-protein
increased the virus’ ability to infect cells of humans and other primates. Ebola
virus circulated in an unknown animal reservoir and rarely crosses over into
people. When the virus does cross over, the effect has been devastating to
those people who are infected. Until recently, the human diseases outbreaks
have been short lived, and the virus has had little opportunity to adapt
genetically to the human host. By increasing infectivity in human cells, it is
possible that these mutations increased Ebola virus spread during the outbreak.
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