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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Spatial and temporal variations in biogenic volatile organic compound emissions for Africa south of the equator - art. no. 8505
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Spatial and temporal variations in biogenic volatile organic compound emissions for Africa south of the equator - art. no. 8505

机译：赤道以南非洲的生物挥发性有机化合物排放的时空变化-艺术。没有。 8505

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摘要

Improved vegetation distribution and emission data for Africa south of the equator were developed for the Southern African Regional Science Initiative ( SAFARI 2000) and were combined with biogenic volatile organic compound (BVOC) emission measurements to estimate BVOC emissions for the southern African region. The BVOCs are estimated to total 80 Tg C yr(-1) for the region, with isoprene and monoterpenes contributing 56 and 7 Tg C yr(-1), respectively. The large uncertainties, particularly in terms of basal emission capacity assignment, associated with these outputs are discussed. Woodlands are predicted to be the dominant vegetation type, covering 23% of southern Africa, and are the largest annual source of isoprene ( 20 Tg C), monoterpenes (3 Tg C), and other VOCs (4 Tg C). Mopane savannas and woodlands are predicted to contribute over 75% of all monoterpenes, primarily from light-dependent emission processes. Rain forests cover only 3.5% of the total area but have high annual emission rates (9.8 g C m(-2) yr(-1)). In the tropical regions with high rainfall, warm temperatures, and high plant productivity throughout the year, the seasonal variation in VOC emissions was small. In subtropical regions, dominated by highly seasonal savannas and grasslands, large variations were predicted, with emissions declining by up to 85% during dry winter periods (June-August) due to low leaf area index after leaf drop. [References: 64]
机译：为南部非洲区域科学计划（SAFARI 2000）开发了改进的赤道以南非洲植被分布和排放数据，并将其与生物挥发性有机化合物（BVOC）排放量测量结果相结合，以估算南部非洲地区的BVOC排放量。该区域的BVOC估计总计为80 Tg C yr（-1），其中异戊二烯和单萜分别贡献56 Tg C yr（-1）和7 Tg C yr（-1）。讨论了与这些产出相关的巨大不确定性，特别是在基础排放能力分配方面。林地被认为是主要的植被类型，覆盖南部非洲的23％，是异戊二烯（20 Tg C），单萜（3 Tg C）和其他VOC（4 Tg C）的最大年度来源。据预测，大草原的Mopane草原和林地将占所有单萜的75％以上，主要来自与光有关的发射过程。雨林仅占总面积的3.5％，但年排放率很高（9.8 g C m（-2）yr（-1））。在全年降雨量高，温度高，植物生产力高的热带地区，VOC排放量的季节性变化很小。在亚热带地区，以高度季节性的热带稀树草原和草原为主，预计会有很大的变化，由于叶片掉落后叶面积指数低，在干燥的冬季（6月至8月），排放量下降了85％。 [参考：64]

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