Journal
ATMOSPHERIC ENVIRONMENT
Volume 246, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2020.118064
Keywords
BVOC mixing ratio; Ecosystem; Monoterpenoid; Sesquiterpene; Isoprene; Kenya
Funding
- University of Helsinki
- Finnish Meteorological Institute
- Mazingire Center of the International Livestock Research Institute (ILRI)
- China Scholarship Council [201806040217]
- Academy of Finland [318645, 316151, 275608, 307331]
- National Council for Science and Technology, Kenya [NACOSTI/P/20/3385]
- Academy of Finland (AKA) [275608, 316151, 316151, 275608] Funding Source: Academy of Finland (AKA)
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The study examined the mixing ratios of BVOCs in various ecosystems in southern Kenya, revealing different proportions of isoprene and monoterpenoids in the total mixing ratios across forests, agricultural areas, bushlands, and grasslands. Monoterpenoids, especially in certain landscapes, were found to have a significant impact on the total BVOC mixing ratios.
Biogenic volatile organic compounds (BVOCs) have an important impact on atmospheric chemistry. Mixing ratio of BVOCs in different ecosystems have been measured and discussed in detail in recent decades. However, field measurements from tropical Africa remain scarce. In this study, we present the mixing ratio of BVOCs, including isoprene, monoterpenoids, sesquiterpenes, bornylacetate, and 2-methyl-3-buten-2-ol from typical forests, bushlands, grasslands and agricultural ecosystems in Taita Taveta County, southern Kenya. The measurements were conducted in April 2019 during the end of the dry season. The total BVOC mixing ratios in forest, agricultural, bushland and grassland ecosystems were 913 +/- 183 pptv, 1094 +/- 179 pptv, 751 +/- 47 pptv and 886 +/- 95 pptv, respectively. Isoprene represented 76%, 86%, 91% and 85%, respectively, of total mixing ratios. Monoterpenoids represented in 23%, 14%, 8% and 14% of total mixing ratios, respectively. Monoterpenoid have strong effect on the total BVOC mixing ratios, especially at the certain landscape (i.e. wattletree, pine and cypress forest, and dry grassland). The monoterpenoids were dominated by alpha-pinene, limonene and beta-pinene in all of the ecosystems. Linalool was found in a relative high mixing ratio from all lowland samples, which was likely responding to the lower soil moisture.
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