CERN's CLOUD experiment shines new light on climate change

Oct 07, 2013
Credit: NASA

(Phys.org) —In a paper published today in the journal Nature, the CLOUD experiment at CERN reports a major advance towards solving a long-standing enigma in climate science: how do aerosols - tiny solid or liquid particles suspended in the air - form in the atmosphere, and which gases are responsible? This is a key question in understanding the climate, since aerosols cause a cooling effect by reflecting sunlight and by seeding cloud droplets.

The CLOUD researchers made two key discoveries. Firstly, they found that minute concentrations of amine vapours combine with sulphuric acid to form aerosol particles at rates similar to those observed in the atmosphere. Then, using a pion beam from the CERN Proton Synchrotron, they found that ionising radiation such as the that bombards the atmosphere from space has negligible influence on the formation rates of these particular .

"Thanks to CERN's expertise in materials, gas systems and ultra-high vacuum technologies," said CLOUD spokesperson Jasper Kirkby, "we were able to build a chamber with unprecedented cleanliness, allowing us to simulate the atmosphere and introduce minute amounts of various atmospheric vapours under carefully controlled conditions – in this case amines and sulphuric acid."

Amines are atmospheric vapours closely related to ammonia, and are emitted both from human activities such as animal husbandry, and from natural sources. Amines are responsible for odours emanating from the decomposition of organic matter that contains proteins. For example, the smell of rotten fish is due to trimethylamine. The CLOUD experiment's unique ultra-clean chamber allowed the collaboration to demonstrate that the extremely low concentrations of amines typically found in the atmosphere - a few parts per trillion by volume - are sufficient to combine with sulphuric acid to form highly stable at high rates.

The measured sensitivity of aerosol formation to amines came as a surprise, and points to a potentially significant cooling mechanism. Moreover, since amine scrubbing is likely to become an important technology for capturing carbon dioxide emissions from fossil-fuelled power plants, this effect is likely to rise in future.

The CLOUD result adds another significant measurement in understanding the climate. But it does not rule out a role for cosmic radiation, not does it offer a quick fix for global warming.

"This is the first time that atmospheric particle formation has been reproduced with complete knowledge of the participating molecules", said Kirkby. "However our measurements leave open the possibility that the formation of aerosols in the may also proceed with other vapours, for which the effect of cosmic rays may be different. This is an important step forward, but we still have a long way to go before we fully understand the processes of aerosol formation and their effects on clouds and climate."

Explore further: Danish experiment suggests unexpected magic by cosmic rays in cloud formation

More information: Molecular understanding of sulphuric acid–amine particle nucleation in the atmosphere, DOI: 10.1038/nature12663

Related Stories

Atmospheric aerosol climate caution

Oct 01, 2012

Carbon dioxide is not the only problem we must address if we are to understand and solve the problem of climate change. According to research published this month in the International Journal of Global Warming, we as yet ...

Recommended for you

Climate impacts of changing aerosol emissions since 1996

1 hour ago

The re-distribution of anthropogenic aerosol emissions from Europe and North America towards China and India between 1996 and 2010 has surprisingly warmed rather than cooled the global climate. This result reinforces the ...

Hurricane churns towards Bermuda, to impact US

18 hours ago

A strengthening Hurricane Cristobal had Bermuda in its sights Tuesday, US meteorologists said, warning of heavy rain, high winds and life-threatening rip currents in Florida and beyond.

TRMM and Aqua satellites gaze into Hurricane Cristobal

18 hours ago

NASA's TRMM and Aqua satellites have been providing views of the outside and inside of Hurricane Cristobal as it heads for Bermuda. The National Hurricane Center posted a Tropical Storm Watch for Bermuda ...

Satellite shows Hurricane Marie about to swallow Karina

18 hours ago

Massive Hurricane Marie appears like a giant fish about to swallow tiny Tropical Depression Karina on satellite imagery today from NOAA's GOES-West satellite. Karina, now a tropical depression is being swept ...

NASA sees huge Hurricane Marie slam Socorro Island

18 hours ago

NASA's Terra satellite passed over Hurricane Marie when its eye was just to the west of Socorro Island in the Eastern Pacific. Marie's eye may have been near the island, but the storm extended several hundreds ...

User comments : 0