1National Centre for Atmospheric Science, NCAS, UK
2Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
3Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK
4School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, M13 3PL, UK
5ESRL, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305-3328, USA
6School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
7Centre for Ecology and Hydrology, Penicuik, EH26 OQB, UK
8Department of Chemistry, University of York, Heslington, UK
9Department of Chemistry, University of Edinburgh, Edinburgh, UK
*now at: KIT, Institute of Meteorology and Climate Research-Atmospheric Environmental Research, Kreuzeckbahn Str. 19, 82467 Garmisch-Partenkirchen, Germany
**now at: Deparment of Environmental Science, Policy and Management, University of California, Berkerley, CA 94720, USA
Received: 19 Dec 2012 – Discussion started: 20 Mar 2013
Abstract. In this study, a high resolution version of the Cambridge p-TOMCAT chemical transport model is used, along with measurement data from the 2008 NERC-funded Oxidant and Particle Photochemical Processes (OP3) project, to examine the potential impact of the expansion of oil palm in Borneo on atmospheric composition. Several model emission scenarios are run for the OP3 measurement period, incorporating emissions from both global datasets and local flux measurements. Using the OP3 observed isoprene fluxes and OH recycling chemistry in p-TOMCAT substantially improves the comparison between modelled and observed isoprene and OH concentrations relative to using MEGAN isoprene emissions without OH recycling. However, a similar improvement was also achieved without using HOx recycling, by fixing boundary layer isoprene concentrations over Borneo to follow the OP3 observations. An extreme hypothetical future scenario, in which all of Borneo is converted to oil palm plantation, assessed the sensitivity of the model to changes in isoprene and NOx emissions associated with land-use change. This scenario suggested a 70% upper limit on surface ozone increases resulting from land-use change on Borneo, excluding the impact of future changes in emissions elsewhere. Although the largest changes in this scenario occurred directly over Borneo, the model also calculated notable regional changes of O3, OH and other species downwind of Borneo and in the free troposphere.
Revised: 25 Jul 2013 – Accepted: 26 Jul 2013 – Published: 16 Sep 2013
Warwick, N. J., Archibald, A. T., Ashworth, K., Dorsey, J., Edwards, P. M., Heard, D. E., Langford, B., Lee, J., Misztal, P. K., Whalley, L. K., and Pyle, J. A.: A global model study of the impact of land-use change in Borneo on atmospheric composition, Atmos. Chem. Phys., 13, 9183-9194, doi:10.5194/acp-13-9183-2013, 2013.