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| Titel |
The Model of Emissions of Gases and Aerosols from Nature version 2.1 (MEGAN2.1): an extended and updated framework for modeling biogenic emissions |
| VerfasserIn |
A. B. Guenther, X. Jiang, C. L. Heald, T. Sakulyanontvittaya, T. Duhl, L. K. Emmons, X. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 6 ; Nr. 5, no. 6 (2012-11-26), S.1471-1492 |
| Datensatznummer |
250002952
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| Publikation (Nr.) |
 copernicus.org/gmd-5-1471-2012.pdf |
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| Zusammenfassung |
| The Model of Emissions of Gases and Aerosols from Nature version 2.1
(MEGAN2.1) is a modeling framework for estimating fluxes of biogenic
compounds between terrestrial ecosystems and the atmosphere using simple
mechanistic algorithms to account for the major known processes controlling
biogenic emissions. It is available as an offline code and has also been
coupled into land surface and atmospheric chemistry models. MEGAN2.1 is an
update from the previous versions including MEGAN2.0, which was described for
isoprene emissions by Guenther et al. (2006) and MEGAN2.02, which was
described for monoterpene and sesquiterpene emissions by Sakulyanontvittaya
et al. (2008). Isoprene comprises about half of the total global biogenic
volatile organic compound (BVOC) emission of 1 Pg (1000 Tg or 1015 g)
estimated using MEGAN2.1. Methanol, ethanol, acetaldehyde, acetone, α-pinene,
β-pinene, t-β-ocimene, limonene, ethene, and propene
together contribute another 30% of the MEGAN2.1 estimated emission. An
additional 20 compounds (mostly terpenoids) are associated with the MEGAN2.1
estimates of another 17% of the total emission with the remaining 3%
distributed among >100 compounds. Emissions of 41 monoterpenes and 32
sesquiterpenes together comprise about 15% and 3%, respectively, of the
estimated total global BVOC emission. Tropical trees cover about 18% of
the global land surface and are estimated to be responsible for ~80% of
terpenoid emissions and ~50% of other VOC emissions. Other trees cover
about the same area but are estimated to contribute only about 10% of
total emissions. The magnitude of the emissions estimated with MEGAN2.1 are
within the range of estimates reported using other approaches and much of the
differences between reported values can be attributed to land cover and
meteorological driving variables. The offline version of MEGAN2.1 source code
and driving variables is available from http://bai.acd.ucar.edu/MEGAN/
and the version integrated into the Community Land Model version 4 (CLM4) can
be downloaded from http://www.cesm.ucar.edu/. |
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