Navigation Links
New insights into cloud formation
Date:3/5/2012

Clouds have a profound effect on the climate, but we know surprisingly little about how they form. Erika Sundn, researcher at the University of Gothenburg, Sweden, has studied how extremely small cloud particles can dispose of excess energy. This knowledge is necessary to understand processes in the atmosphere that affect global climate change.

The models that have been built to describe climate change contain a major source of uncertainty, namely the effects of clouds. The UN Intergovernmental Panel on Climate Change points out in its climate report for 2007 that new knowledge is needed in this field. It is namely the case that clouds can act in two ways: they may be a mirror that reflects radiation from the sun back into space, and they may be a blanket that seals in the heat emitted by the Earth. Mapping the formation and dispersion of clouds may, therefore, be a key step in climate research.

"One important stage is understanding the fundamental properties of the particles involved", says Erika Sundn, doctoral student at the Department of Physics, University of Gothenburg.

Ammonia may play an important role

Erika has studied small particles known as "clusters", which contain between 3 and 300 molecules. One line of research has investigated how water clusters dissipate excess energy, and this will help to understand how water droplets grow and how they evaporate. These are the processes by which ice and liquid water are transformed into water vapour (gas).

Another line has investigated how the clusters are influenced by ammonia, which is an important component of the atmosphere.

"I investigated water clusters that contained a small fraction of ammonia, and compared these with pure water clusters. I was able to show that the ammonia contributed to the stability of the clusters, and prevented them evaporating so rapidly. It may be that ammonia plays an important role in the early stages of cloud formation", she says.

Temperatures of -100 degrees

It is not easy to measure the heat capacity of clusters, and an important part of her research has been to develop a method that can be used in future studies. Put simply, you could say that she has created water clusters in air, drawn them into a vacuum, and then examined them as they disintegrate. This method led her to an unexpected discovery.

"The temperature inside these clusters was around -100 C, so one would expect that their heat capacity would correspond to that of ice. Despite this, the heat capacity of medium-sized clusters was greater, intermediate between that of ice and liquid water. The importance of this for how clouds form will be the subject of further research", she says.

New insights into space clouds

Erika Sundn presents in her thesis also studies into the cooling rate and radiation of carbon particles, which may be a component of space clouds. It has long been uncertain whether molecules can exist in the empty space between the stars and planets, since the density of atoms is so low. The first negatively charged carbon molecules were discovered in 2006, however, after which work has continued surveying the molecules that are present in space clouds.

"First radiation from space is measured, and then it's a case of creating models that can explain the observations. We create in the lab charged molecules that may be present in these clouds, and investigate whether these molecules emit radiation and, if so, to what extent", she says.


'/>"/>

Contact: Erika Sundn
erikasunden@gmail.com
46-706-555-233
University of Gothenburg
Source:Eurekalert  

Related biology news :

1. New papers offer insights into process of malarial drug resistance
2. Mixing genomics and geography yields insights into life and environment
3. New insights into a leading poultry disease and its risks to human health
4. New paper offers key insights into how new species emerge
5. Mixed population provides insights into human genetic makeup
6. Addiction: Insights from Parkinsons disease
7. Lohafex provides new insights on plankton ecology
8. New insights into progressive hearing loss
9. First neuroimaging study examining motor execution in children with autism reveals new insights
10. Limping rat provides sciatica insights
11. Researchers gain genome-wide insights into patterns of the worlds human population structures
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New insights into cloud formation
(Date:11/29/2016)... BioDirection, a privately held medical device company ... detection of concussion and other traumatic brain injury (TBI), ... meeting with the U.S. Food and Drug Administration (FDA) ... During the meeting company representatives reviewed plans for clinical ... commencement of a planned pilot trial. ...
(Date:11/29/2016)... , November 29, 2016 Nearly one billion ... Continue Reading ... ... part of an efficient Identity Management. (PRNewsFoto/DERMALOG Identification Systems) ... DERMALOG is Germany's largest Multi-Biometric supplier: The ...
(Date:11/24/2016)... 23, 2016 Cercacor today introduced Ember TM ... trainers non-invasively measure hemoglobin, Oxygen Content, Oxygen ... Respiration Rate in approximately 30 seconds. Smaller than a ... immediate access to key data about their bodies to ... regimen. Hemoglobin carries oxygen to muscles. ...
Breaking Biology News(10 mins):
(Date:12/6/2016)... -- The American Botanical Council (ABC) recognizes wellness ... Arnica montana ) through ABC,s Adopt-an-Herb program. This ... database, a comprehensive, interactive online tool that provides ... on the uses and health effects of more ... wellness company with healing arts centers, skin and ...
(Date:12/6/2016)... ... December 06, 2016 , ... ... world’s largest privately-held contract pharmaceutical development and manufacturing organisation, today announced ... outsourcing company combining a leading CRO and the industry’s only Contract Commercial ...
(Date:12/6/2016)... ... ... Discovering new clues to natural treatments that could allow our bodies to ... And searching for keys to our immune systems by studying parasite-resistant fish. These are ... Edith and Peter O’Donnell Awards by The Academy of Medicine, Engineering and ...
(Date:12/6/2016)... Colorado (PRWEB) , ... December 06, 2016 , ... ... dynamic aqueous plasma technology platforms, announced today that the company has engaged in ... Research and Development Agreement (MRDA) with the CSU Office of the Vice President ...
Breaking Biology Technology: