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Title: Biogenic isoprene emission and its climate feedbacks
Author: Pacifico, Federica Maria
ISNI:       0000 0004 2737 0079
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2011
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Biogenic Isoprene Emission and its Climate Feedbacks Biogenic Volatile Organic Compounds (BVOCs) affect the lifetime of methane and modulate tropospheric ozone, both greenhouses gases. They are also a source of secondary organic aerosol, which affect cloud properties and the surface radiation budget. Isoprene has the largest emission flux of all the BVOCs. In this thesis I have reviewed the current knowledge of isoprene production, the environmental controls on production, the availability of isoprene flux measurements, the global isoprene budget and the isoprene feed backs with atmospheric chemistry and climate, focusing on issues that are relevant for the incorporation of isoprene emissions in a modelling framework. I have implemented and evaluated an isoprene emission scheme under current climate conditions. The isoprene emission model reproduces the main features of the diurnal cycle, daily variability and seasonal cycle of isoprene emissions. Simulated global annual emissions for present-day are in the range of past estimates. I have applied the isoprene emission model under Last Glacial Maximum (LGM) climate conditions to simulate the change in isoprene emissions and to quantify the impact of this change on atmospheric methane. My estimate of the impact of isoprene emissions on LGM methane atmospheric concentration indicates that isoprene is responsible for 108 ppb drop in methane. The estimated change in isoprene emissions alone is not sufficient to explain the drop in methane at the LGM, but isoprene emission is still a big controller of glacial methane. I have simulated biogenic isoprene emissions and its impact on atmospheric chemistry under pre- industrial, present-day and future climate conditions. The impact of biogenic isoprene emissions on the global ozone burden and methane lifetime is small and the impact of changes in isoprene emissions on atmospheric chemistry depends strongly on the state of climate and chemistry. To perform some complicated computer simulations I have relied on collaborations. In particular I have used pre-industrial and LGM climate data simulated by Tamsin Edwards (University of Bristol) to drive my isoprene model in Chapter 5. Gerd Folberth (Met Office Hadley Centre) has also helped me setting up the Global Climate Model simulations to investigate the impact of isoprene emissions on atmospheric chemistry under pre-industrial, present-day and future climate conditions (Chapter 6).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available