Title Effects of climate-induced changes in isoprene emissions after the eruption of Mount Pinatubo
Author Telford, P.J.; Lathière, J.; Abraham, N.L.; Archibald, A.T.; Braesicke, P.; Johnson, C.E.; Morgenstern, O.; O'Connor, F.M.; Pike, R.C.; Wild, O.; Young, P.J.; Beerling, D.J.; Hewitt, C.N.; Pyle, J.A.
Author Affil Telford, P.J., University of Cambridge, Centre for Atmospheric Science, Cambridge, United Kingdom. Other: University of Sheffield, United Kingdom; Lancaster University, United Kingdom; Met Office, United Kingdom
Source Atmospheric Chemistry and Physics, 10(15), p.7117-7125, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2010
Notes In English. Published in Atmospheric Chemistry and Physics Discussions: 11 March 2010, http://www.atmos-chem-phys- discuss.net/10/6871/2010/acpd-10-6871- 2010.html ; accessed in June, 2011. 50 refs. GeoRef Acc. No: 310031
Index Terms precipitation (meteorology); biomass; climatic change; humidity; hydrocarbons; ice; moisture; soils; soil temperature; solar radiation; statistical analysis; temperature; Philippine Islands--Mount Pinatubo; aliphatic hydrocarbons; alkanes; Asia; atmospheric precipitation; atmospheric transport; biochemistry; carbon dioxide; climate change; climate effects; El Nino Southern Oscillation; eruptions; Far East; greenhouse gases; hydroxides; isoprenoids; Luzon; methane; Mount Pinatubo; organic compounds; oxidation; oxides; Philippine Islands; photochemistry; photolysis; sea ice; sea- surface temperature; spatial distribution; time series analysis; transport; troposphere; volcanism
Abstract In the 1990s the rates of increase of greenhouse gas concentrations, most notably of methane, were observed to change, for reasons that have yet to be fully determined. This period included the eruption of Mt. Pinatubo and an El Nino warm event, both of which affect biogeochemical processes, by changes in temperature, precipitation and radiation. We examine the impact of these changes in climate on global isoprene emissions and the effect these climate dependent emissions have on the hydroxy radical, OH, the dominant sink for methane. We model a reduction of isoprene emissions in the early 1990s, with a maximum decrease of 40 Tg(C)/yr in late 1992 and early 1993, a change of 9%. This reduction is caused by the cooler, drier conditions following the eruption of Mt. Pinatubo. Isoprene emissions are reduced both directly, by changes in temperature and a soil moisture dependent suppression factor, and indirectly, through reductions in the total biomass. The reduction in isoprene emissions causes increases of tropospheric OH which lead to an increased sink for methane of up to 5 Tg(CH4)/year, comparable to estimated source changes over the time period studied. There remain many uncertainties in the emission and oxidation of isoprene which may affect the exact size of this effect, but its magnitude is large enough that it should remain important.
URL http://www.atmos-chem-phys.net/10/7117/2010/acp-10-7117-2010.pdf
Publication Type journal article
Record ID 65006821