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| Titel |
Probabilistic estimation of future emissions of isoprene and surface oxidant chemistry associated with land-use change in response to growing food needs |
| VerfasserIn |
C. J. Hardacre, P. I. Palmer, K. Baumanns, M. Rounsevell, D. Murray-Rust |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 11 ; Nr. 13, no. 11 (2013-06-03), S.5451-5472 |
| Datensatznummer |
250018682
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| Publikation (Nr.) |
 copernicus.org/acp-13-5451-2013.pdf |
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| Zusammenfassung |
| We quantify the impact of land-use change, determined by our growing demand for food and biofuel
production, on isoprene emissions and subsequent atmospheric oxidant chemistry in 2015 and 2030,
relative to 1990, ignoring compound climate change effects over that period. We estimate isoprene
emissions from an ensemble (n = 1000) of land-use change realizations from 1990–2050, broadly
guided by the IPCC AR4/SRES scenarios A1 and B1. We also superimpose land-use change required to
address projected biofuel usage using two scenarios: (1) assuming that world governments make no
changes to biofuel policy after 2009, and (2) assuming that world governments develop biofuel
policy with the aim of keeping equivalent atmospheric CO2 at 450 ppm. We present the
median and interquartile range (IQR) statistics of the ensemble and show that land-use change
between −1.50 × 1012 m2 to +6.06 × 1012 m2 was found to
drive changes in the global isoprene burden of −3.5 to +2.8 Tg yr−1 in 2015 and
−7.7 to +6.4 Tg yr−1 in 2030. We use land-use change realizations corresponding
to the median and IQR of these emission estimates to drive the GEOS-Chem global 3-D chemistry
transport model to investigate the perturbation to global and regional surface concentrations of
isoprene, nitrogen oxides (NO+NO2), and the atmospheric concentration and deposition of
ozone (O3). We show that across subcontinental regions the monthly surface O3
increases by 0.1–0.8 ppb, relative to a zero land-use change calculation, driven by increases
(decreases) in surface isoprene in high (low) NOx environments. At the local scale
(4° × 5°) we find that surface O3 increases by 5–12 ppb over
temperate North America, China and boreal Eurasia, driven by large increases in isoprene emissions
from short-rotation coppice crop cultivation for biofuel production. |
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