Palmer Paul I, Barkley Michael P, Kurosu Thomas P, Lewis Alastair C, Saxton Julie E, Chance Kelly, Gatti Luciana V
School of GeoSciences, University of Edinburgh, Edinburgh, UK.
Philos Trans A Math Phys Eng Sci. 2007 Jul 15;365(1856):1741-51. doi: 10.1098/rsta.2007.2042.
Space-borne column measurements of formaldehyde (HCHO), a high-yield oxidation product of volatile organic compounds (VOCs), represent important constraints for quantifying net regional fluxes of VOCs. Here, we interpret observed distributions of HCHO columns from the Global Ozone Monitoring Experiment (GOME) over tropical South America during 1997-2001. We present the first comparison of year-long in situ isoprene concentrations and fire-free GOME HCHO columns over a tropical ecosystem. GOME HCHO columns and in situ isoprene concentrations are elevated in the wet and dry seasons, with the highest values in the dry season. Previous analysis of the in situ data highlighted the possible role of drought in determining the elevated concentrations during the dry season, inferring the potential of HCHO columns to provide regional-scale constraints for estimating the role of drought on isoprene emissions. The agreement between the observed annual cycles of GOME HCHO columns and Along-Track Scanning Radiometer firecount data over the Amazon basin (correlations typically greater than 0.75 for a particular year) illustrates the potential of HCHO column to provide quantitative information about biomass burning emissions.
作为挥发性有机化合物（VOCs）的高产量氧化产物，甲醛（HCHO）的星载柱浓度测量对于量化VOCs的区域净通量具有重要的约束作用。在此，我们解读了1997年至2001年期间全球臭氧监测实验（GOME）在南美洲热带地区观测到的HCHO柱浓度分布情况。我们首次比较了热带生态系统中长达一年的原位异戊二烯浓度和无火灾情况下的GOME HCHO柱浓度。GOME HCHO柱浓度和原位异戊二烯浓度在湿季和干季均有所升高，其中干季的值最高。先前对原位数据的分析强调了干旱在决定干季浓度升高方面可能发挥的作用，推断出HCHO柱浓度有潜力为估算干旱对异戊二烯排放的作用提供区域尺度的约束。GOME HCHO柱浓度的观测年周期与亚马逊河流域沿轨扫描辐射计火灾计数数据之间的一致性（特定年份的相关性通常大于0.75）说明了HCHO柱浓度有潜力提供有关生物质燃烧排放的定量信息。
