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Book Review : “A Natural History of Time”

This excellent book must now be regarded as the preferred starting point for anyone wishing to understand the history of efforts to know the earth’s age. click for more...

 
7 New Books
Carbon Footprint of Nations website wins recognition

How much carbon does your country emit - and where does it come from? Norwegian University of Science and Technology (NTNU) Professor Edgar Hertwich and colleague Glen Peters wanted to know the answer to that question - and created a website to do so. click for more...

 
Some interesting pages on volcanos

The pages refer to research projects, some completed and some ongoing, and is for general interest. click for more...

 
 

Geoscience Information For Teachers (GIFT) workshops 2010

A short Report on the GIFT workshops organised this year by the EGU Committee on Education click for more...

 
 
Return to Home Page Issue #31 08 July 2010   
 
Nanoparticle formation by ozonolysis of inducible plant volatiles

The authors present the first laboratory experiments of aerosol formation from oxidation of volatile organic species emitted by living plants, a process which for half a century has been known to take place in the atmosphere. Cabbage plants were treated with methyl jasmonate in order to induce the production of monoterpenes and certain less-volatile sesqui- and homoterpenes. Ozone was introduced into the growth chamber in which the plants were placed, and the subsequent aerosol formation and growth of aerosols were monitored by measuring the particle size distributions continuously during the experiments. 

The observations show similar particle formation rates as in the atmosphere but much higher growth rates. The results indicate that the concentrations of nonvolatile oxidation products of plant released precursors needed to induce the nucleation are roughly an order-of-magnitude higher than their concentrations during atmospheric nucleation events. The results therefore suggest that if oxidized organics are involved in atmospheric nucleation events, their role is to participate in the growth of pre-existing molecular clusters rather than to form such clusters through homogeneous or ion-induced nucleation.

The full article is available online free of charge at
http://www.copernicus.org/EGU/acp/acp/5/1489/acp-5-1489.pdf

 

Joutsensaari J., M. Loivamäki, T. Vuorinen, P. Miettinen, A. -M. Nerg, J. K. Holopainen, A. Laaksonen, Nanoparticle formation by ozonolysis of inducible plant volatiles, Atmos. Chem. Phys., 5, 1489–1495, 2005.

 
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The role of tectonic uplift, climate, and vegetation in the long-term terrestrial phosphorous cycle

A model helps describe how, with limited uplift and atmospheric input, as in the case of the Amazon Basin, ecosystems must rely on mechanisms that enhance P-availability and retention. click for more...

 
Special Issue in NPG

on Nonlinear Processes in Oceanic and Atmospheric Flows click for more...

 
Overview of areal changes of the ice shelves on the Antarctic Peninsula over the past 50 years

a new dataset containing up-to-date and consistent area calculations for each of the twelve ice shelves on the AP over the past five decades click for more...

 
Ionospheric transients observed at mid-latitudes prior to earthquake activity in Central Italy

Acoustic gravity waves are suggested as one of the possible sources of transients observed in the ionosphere before the EQ shock click for more...

 
First images and orientation of fine structure from a 3-D seismic oceanography data set

Work demonstrates the viability of imaging oceanic fine structure in 3-D and obtaining quantitative information such as the spatial orientation of fronts and solitons from 3-D seismic images click for more...

 
A remote sensing technique for global monitoring of power plant CO2 emissions from space

and related applications click for more...

 
Pliocene Model Intercomparison Project (PlioMIP)

experimental design and boundary conditions click for more...

 
Brief Communication: Ikaite (CaCO3·6H2O) discovered in Arctic sea ice

finding demonstrates that the precipitation of calcium carbonate during the freezing of sea ice is not restricted to the Antarctic click for more...

 
Millennial and sub-millennial scale climatic variations

recorded in polar ice cores over the last glacial period click for more...

 
Estimating drizzle drop size and precipitation rate using two-colour lidar measurements

The method exploits the differential absorption of infrared light by liquid water at 905 nm and 1.5 ́m click for more...

 
The relationship between subsurface hydrology and dissolved carbon fluxes

for a sub-arctic catchment click for more...

 
 
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