Picture of wind turbine against blue sky

Open Access research with a real impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

The Energy Systems Research Unit (ESRU) within Strathclyde's Department of Mechanical and Aerospace Engineering is producing Open Access research that can help society deploy and optimise renewable energy systems, such as wind turbine technology.

Explore wind turbine research in Strathprints

Explore all of Strathclyde's Open Access research content

Carbon isotope ratios for chloromethane of biological origin: Potential tool in determining biological emissions

Harper, D.B. and Kalin, R.M. and Hamilton, John T.G. and Lamb, C. (2001) Carbon isotope ratios for chloromethane of biological origin: Potential tool in determining biological emissions. Environmental Science and Technology, 35 (18). pp. 3616-3619.

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

Chloromethane (CH3Cl) with a global atmospheric burden of 5.3 million t is the most abundant halocarbon in the atmosphere. However, the origin of ca. 50% of the estimated annual global input of 4 million t of the gas to the atmosphere has yet to be determined. As the oceanic contribution to the global CH3Cl flux is now tightly constrained, an important terrestrial source is either underestimated or unrecognized. It has recently been proposed that higher plants may represent a CH3Cl source of sufficient magnitude to resolve the global budget imbalance. A potentially useful tool in validating CH3Cl emission flux estimates is comparison of the carbon isotope ratio of atmospheric CH3Cl with those of CH3Cl originating from various sources. Here we report the first measurements of delta C-13 for CH3Cl produced biologically. The CH3Cl released by the higher plant species Batis maritima and Solanum tuberosum was dramatically depleted in C-13 with respect to plant tissue (Delta C-13 = -36.8 parts per thousand and -34.5 parts per thousand, respectively); CH3Cl released by the fungus Phellinus pomaceus also showed significant C-13 depletion with respect to the wood growth substrate (Delta C-13 = -17.9 parts per thousand). When reliable delta C-13 values for the other major sources of atmospheric CH3Cl become available, the distinctive isotopic signature of plant-derived CH3Cl should help constrain the contribution to the atmospheric burden from this source.