Wind-blown Antarctic sea ice helps drive ocean circulation
June 27, 2016 11:34 AM - The Earth Institute at Columbia University via EurekAlert!
Antarctic sea ice is constantly on the move as powerful winds blow it away from the coast and out toward the open ocean. A new study shows how that ice migration may be more important for the global ocean circulation than anyone realized.
A team of scientists used a computer model to synthesize millions of ocean and ice observations collected over six years near Antarctica, and estimated, for the first time, the influence of sea ice, glacier ice, precipitation and heating on ocean overturning circulation. Overturning circulation brings deep water and nutrients up to the surface, carries surface water down, and distributes heat and helps store carbon dioxide as it flows through the world's oceans, making it an important force in the global climate system. The scientists found that freshwater played the most powerful role in changing water density, which drives circulation, and that melting of wind-blown sea ice contributed 10 times more freshwater than melting of land-based glaciers did.
Warning from the past: Future global warming could be even warmer
June 24, 2016 07:05 AM - Niels Bohr Institute
Future global warming will not only depend on the amount of emissions from man-made greenhouse gasses, but will also depend on the sensitivity of the climate system and response to feedback mechanisms. By reconstructing past global warming and the carbon cycle on Earth 56 million years ago, researchers from the Niels Bohr Institute among others have used computer modelling to calculate the potential perspective for future global warming, which could be even warmer than previously thought. The results are published in the scientific journal, Geophysical Research Letters.
2 ways to limit the number of heat-related deaths from climate change
June 23, 2016 07:16 AM - Columbia University Mailman School of Public Health via EurekAlert!
By the 2080s, as many as 3,331 people could die every year from exposure to heat during the summer months in New York City. The high estimate by Columbia University scientists is based on a new model--the first to account for variability in future population size, greenhouse gas trajectories, and the extent to which residents adapt to heat through interventions like air conditioning and public cooling centers. Results appear online in the journal Environmental Health Perspectives.
94-million-year-old climate change event holds clues for future
June 22, 2016 05:10 PM - Florida State University via EurekAlert!
A major climate event millions of years ago that caused substantial change to the ocean's ecological systems may hold clues as to how the Earth will respond to future climate change, a Florida State University researcher said.
In a new study published in Earth and Planetary Science Letters, Assistant Professor of Geology Jeremy Owens explains that parts of the ocean became inhospitable for some organisms as the Earth's climate warmed 94 million years ago. As the Earth warmed, several natural elements -- what we think of as vitamins -- depleted, causing some organisms to die off or greatly decrease in numbers.
Chicago's urban farming produces fresh veggies all year, 24/7
June 22, 2016 10:29 AM - Maurice Picow
Hydroponics and new, high-tech urban agricultural techniques are now growing fresh food in the middle of Manhattan and other large metropolitan centers globally. People are catching onto the taste and business opportunities of urban agriculture: find it growing in Middle Eastern cities such as Cairo, Egypt too!
Urban farming in midwestern American cities like Chicago has had its limitations due to adverse winter weather conditions at least 9 months a year. New indoor farming techniques use vertical farming, special indoor LED lighting and hydroponic systems that pump soybean and kelp-infused water through a temperature and humidity-controlled system, nearly 24 hours a day, 365 days a year.
Carbon dioxide hits record highs in Southern hemisphere
June 21, 2016 01:30 PM - CNRS via ScienceDaily
Last month, the atmospheric concentration of carbon dioxide (CO2) as measured at Amsterdam Island, in the southern Indian Ocean, for the first time exceeded the symbolic value of 400 ppm, or 0.04%. The CO2 concentrations recorded at the Amsterdam Island research station are the lowest in the world (excluding seasonal cycles), due to the island's remoteness from anthropogenic sources. The 400 ppm threshold was already crossed in the Northern hemisphere during the 2012/2013 winter. In addition, the increase of CO2 in the atmosphere is speeding up, growing by more than 2 ppm annually over the past four years. The data has been collected for the past 35 years at the Amsterdam Island research station by the French national observation service ICOS-France at the Laboratoire des Sciences du Climat et de l'Environnement (LSCE, CNRS / CEA / UVSQ), with the support of the Institut Polaire Français Paul-Emile Victor (IPEV).
How China can ramp up wind power
June 21, 2016 11:38 AM - Massachusetts Institute of Technology via ScienceDaily
China has an opportunity to massively increase its use of wind power -- if it properly integrates wind into its existing power system, according to a new study. The research forecasts that wind power could provide 26 percent of China's projected electricity demand by 2030, up from 3 percent in 2015.
Such a change would be a substantial gain in the global transition to renewable energy, since China produces the most total greenhouse gas emissions of any country in the world.
Threats to habitat connectivity as sea waters inundate coastal areas
June 21, 2016 07:05 AM - Jim Melvin, Clemson University
By the year 2100, sea levels might rise as much as 2.5 meters above their current levels, which would seriously threaten coastal cities and other low-lying areas. In turn, this would force animals to migrate farther inland in search of higher ground. But accelerated urbanization, such as the rapidly expanding Piedmont area that stretches from Atlanta to eastern North Carolina, could cut off their escape routes and create climate-induced extinctions.
First Mammal Goes Extinct From Manmade Climate Change
June 17, 2016 07:23 AM - Kevin Mathews, Care2
We’ve reached a sad milestone: Climate change has claimed its first mammal species. Scientists have been warning us that a large percentage of species will face extinction thanks to manmade global warming, and the future is unfortunately here.
According to The Guardian, climate change’s first mammal victim was an adorable rodent known as the Bramble Cay melomys. Sometimes called a mosaic-tailed rat, the melomys was named after Bramble Cay, an Australian island close to Papua New Guinea, that was the only known home for the species.
What Would a Global Warming Increase of 1.5 Degrees Be Like?
June 16, 2016 10:02 AM - Fred Pearce via Yale Environment360.
How ambitious is the world? The Paris climate conference last December astounded many by pledging not just to keep warming “well below two degrees Celsius,” but also to "pursue efforts" to limit warming to 1.5 degrees C. That raised a hugely important question: What's the difference between a two-degree world and a 1.5-degree world?