Acosta Navarro J C, Smolander S, Struthers H, Zorita E, Ekman A M L, Kaplan J O, Guenther A, Arneth A, Riipinen I
Department of Applied Environmental Science and Bolin Centre for Climate Research, Stockholm University Stockholm, Sweden.
Department of Physics, University of Helsinki Helsinki, Finland.
J Geophys Res Atmos. 2014 Jun 16;119(11):6867-6885. doi: 10.1002/2013JD021238. Epub 2014 Jun 9.
We investigated the millennial variability (1000 A.D.-2000 A.D.) of global biogenic volatile organic compound (BVOC) emissions by using two independent numerical models: The Model of Emissions of Gases and Aerosols from Nature (MEGAN), for isoprene, monoterpene, and sesquiterpene, and Lund-Potsdam-Jena-General Ecosystem Simulator (LPJ-GUESS), for isoprene and monoterpenes. We found the millennial trends of global isoprene emissions to be mostly affected by land cover and atmospheric carbon dioxide changes, whereas monoterpene and sesquiterpene emission trends were dominated by temperature change. Isoprene emissions declined substantially in regions with large and rapid land cover change. In addition, isoprene emission sensitivity to drought proved to have significant short-term global effects. By the end of the past millennium MEGAN isoprene emissions were 634 TgC yr (13% and 19% less than during 1750-1850 and 1000-1200, respectively), and LPJ-GUESS emissions were 323 TgC yr(15% and 20% less than during 1750-1850 and 1000-1200, respectively). Monoterpene emissions were 89 TgC yr(10% and 6% higher than during 1750-1850 and 1000-1200, respectively) in MEGAN, and 24 TgC yr (2% higher and 5% less than during 1750-1850 and 1000-1200, respectively) in LPJ-GUESS. MEGAN sesquiterpene emissions were 36 TgC yr(10% and 4% higher than during 1750-1850 and 1000-1200, respectively). Although both models capture similar emission trends, the magnitude of the emissions are different. This highlights the importance of building better constraints on VOC emissions from terrestrial vegetation.
我们使用两个独立的数值模型，研究了公元1000年至2000年全球生物源挥发性有机化合物（BVOC）排放的千年变化：用于异戊二烯、单萜和倍半萜的自然气体和气溶胶排放模型（MEGAN），以及用于异戊二烯和单萜的隆德-波茨坦-耶拿通用生态系统模拟器（LPJ-GUESS）。我们发现，全球异戊二烯排放的千年趋势主要受土地覆盖和大气二氧化碳变化的影响，而单萜和倍半萜的排放趋势则主要受温度变化的影响。在土地覆盖变化大且迅速的地区，异戊二烯排放大幅下降。此外，事实证明，异戊二烯排放对干旱的敏感性具有显著的短期全球影响。到上一个千年末，MEGAN的异戊二烯排放量为634 TgC/年（分别比1750 - 1850年和1000 - 1200年少13%和19%），LPJ-GUESS的排放量为323 TgC/年（分别比1750 - 1850年和1000 - 1200年少15%和20%）。MEGAN中的单萜排放量为89 TgC/年（分别比1750 - 1850年和1000 - 1200年高10%和6%），LPJ-GUESS中的单萜排放量为24 TgC/年（分别比1750 - 1850年高2%，比1000 - 1200年少5%）。MEGAN的倍半萜排放量为36 TgC/年（分别比1750 - 1850年和1000 - 1200年高10%和4%）。尽管两个模型捕捉到了相似的排放趋势，但排放量的大小不同。这凸显了对陆地植被挥发性有机化合物排放建立更好约束的重要性。
