Eruption of Bardarbunga volcano in Iceland and its impact on SO2 concentrations in Europe

The six month long eruption of the Bardarbunga volcano (31 August 2014?27 February 2015 ) was the largest in Iceland since the devastating Laki eruption of 1783-84, producing around 1.6 km3 of lava, covering an area equivalent to Manhattan Island.

The eruption caused total Sulphur dioxide (SO2) emissions of nearly 12m tonnes, which exceeded the total SO2 emitted in Europe in 2011. In Iceland, concentration of SO2 exceeded the 350 µg m-3 hourly average health limit over much of the country for days to weeks. However, the effects of the volcano were not confined to Iceland - many parts of Europe also saw high SO2 levels.

Researchers were initially concerned that the SO2 emissions would be much higher, which would have caused serious health problems throughout Iceland and perhaps Europe.

Where does water from rain and snow melt actually go?

More than a quarter of the rain and snow that falls on continents reaches the oceans as runoff. Now a new study helps show where the rest goes: two-thirds of the remaining water is released by plants, more than a quarter lands on leaves and evaporates and what’s left evaporates from soil and from lakes, rivers and streams.

Warming impacting bird populations in Hawai'i

Hawai‘i, the name alone elicits images of rhythmic traditional dancing, breathtaking azure sea coasts and scenes of vibrant birds flitting through lush jungle canopy. Unfortunately, the future of many native Hawaiian birds looks grim as diseases carried by mosquitoes are due to expand into higher elevation safe zones.

A new study published in Global Change Biology, by researchers at the U.S. Geological Survey and the University of Wisconsin-Madison, assesses how global climate change will affect future malaria risk to native Hawaiian bird populations in the coming century.

Does past sea level rise portend future rise from warming?

You may have seen claims in recent weeks that historic records show a global temperature rise could give us sea levels 20 feet higher than the norm. How accurate are these claims, and why is it important that we take this issue seriously?

The reports are a result of a University of Florida study that was recently published in the journal Science. The researchers, including lead author Andrea Dutton, wanted to investigate how historically Greenland and Antarctic ice sheets have reacted to global temperature rises and therefore get a glimpse of how current climate change might impact our sea levels.

The role of oceanic plankton in cloud formation

Nobody knows what our skies looked like before fossil fuel burning began; today, about half the cloud droplets in Northern Hemisphere skies formed around particles of pollution. Cloudy skies help regulate our planet’s climate and yet the answers to many fundamental questions about cloud formation remain hazy.

Satellites use chlorophyll’s green color to detect biological activity in the oceans. The lighter-green swirls are a massive December 2010 plankton bloom following ocean currents off Patagonia, at the southern tip of South America.NASA

How clouds get their brightness

How clouds form and how they help set the temperature of the earth are two of the big remaining questions in climate research. Now, a study of clouds over the world's remotest ocean shows that ocean life is responsible for up to half the cloud droplets that pop in and out of existence during summer.

Oceans slowed global temperature rise

A new study of ocean temperature measurements shows that in recent years, extra heat from greenhouse gases has been trapped in the subsurface waters of the Pacific and Indian oceans, thus accounting for the slowdown in the global surface temperature increase observed during the past decade, researchers say.

Welcome three new National Monuments

Using his authority under the Antiquities Act of 1906, President Obama announced last week that he was creating three new national monuments. The President designated scenic mountains in California as Berryessa Snow Mountain National Monument, pristine wilderness landscapes in Nevada as Basin and Range National Monument, and a fossil-rich site in Texas as Waco Mammoth National Monument.

Together, the new monuments protect more than one million acres of public lands. National monuments are similar to national parks, except that they can be created from any land owned or controlled by the federal government via a presidential proclamation. With these new designations, Obama will have used the Antiquities Act to establish or expand 19 national monuments in the United States in total. Altogether, he has protected more than 260 million acres of public lands and waters.

Acidic Arctic Ocean Threatens Food Web

One byproduct of rising carbon-dioxide levels is increasing ocean acidity — a phenomenon that scientists have termed an existential threat to marine life. The waters of the Arctic and the far-north Pacific are particularly prone to acidification as a result of several natural factors, so scientists regard the region as the proverbial canary in the coal mine for the rest of the world's oceans. A new study shows that within just fifteen years these waters may be too acidic for a range of marine animals to build and maintain their shells year round. 

France estimates the economic costs of air pollution

The French Senate has called for new efforts to tackle air pollution, arguing it inflates healthcare costs, reduces economic productivity and agricultural yields, and has put Paris in the EU's bad books.

A Committee of Inquiry in the French Senate has described air pollution as an "economic aberration". The committee's proposals to reduce the phenomenon, which costs France over €100 billion every year, include raising the tax on diesel and taxing emissions of the worst polluting substances.

In the report entitled "Air pollution: the cost of inaction", published on Wednesday 15 July, the Senate committee estimated the annual cost of air Pollution in France at €101.3 billion.