The Model of Emissions of Gases and Aerosols from Nature version 2.1 (MEGAN2.1): an extended and updated framework for modeling biogenic emissions
The Model of Emissions of Gases and Aerosols from Nature version 2.1 (MEGAN2.1): an extended and updated framework for modeling biogenic emissions
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DOI：
10.5194/gmd-5-1471-2012
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发表时间：
2012-01-01
影响因子：
5.1
通讯作者：
Wang, X.
中科院分区：
文献类型：
--
作者：
Guenther, A. B.;Jiang, X.;Wang, X.
自然界气体和气溶胶排放模型2.1版（MEGAN2.1）是一个模型框架，用于估计陆地生态系统和大气之间的生物化合物通量，使用简单的机械算法来解释控制生物排放的主要已知过程。它是一个离线代码，也被耦合到陆地表面和大气化学模型。MEGAN2.1是对先前版本的更新，包括Guenther等人（2006年）针对异戊二烯排放量描述的MEGAN2.0和Sakulyanontvittaya等人（2008年）针对单萜和倍半萜排放量描述的MEGAN2.02。异戊二烯约占全球生物挥发性有机化合物（BVOC）排放总量的一半，使用MEGAN2.1估计为1 Pg（1000 Tg或1015 g）。甲醇、乙醇、乙醛、丙酮、α-蒎烯、β-蒎烯、t-β-罗勒烯、柠檬烯、乙烯和丙烯共同贡献了MEGAN 2.1估计排放量的另外30%。另外20种化合物（主要是萜类化合物）与MEGAN2.1估计的另外17%的总排放量有关，其余3%分布在>100种化合物中。41种单萜和32种倍半萜的排放量分别占估计的全球BVOC排放总量的15%和3%。热带树木覆盖了约18%的全球陆地表面，估计占萜类化合物排放量的80%，占其他挥发性有机化合物排放量的50%。其他树木的面积大致相同，但估计仅占总排放量的10%左右。使用MEGAN2.1估算的排放量在使用其他方法报告的估算值范围之内，报告值之间的大部分差异可归因于土地覆被和气象驱动变量。MEGAN2.1源代码和驱动变量的离线版本可从http://bai.acd.ucar.edu/MEGAN/获得，集成到社区土地模型第4版（CLM 4）中的版本可从www.example.com下载。http://www.cesm.ucar.edu/
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, alpha-pinene, beta-pinene, t-beta-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 similar to 80% of terpenoid emissions and similar to 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/.