Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China; School of Resource and Environment, Yunnan University, Yunnan 650000, China.
School of Information Science, Yunnan University of Finance and Economics, Yunnan 650000, China.
Sci Total Environ. 2018 Feb 1;613-614:168-175. doi: 10.1016/j.scitotenv.2017.08.210. Epub 2017 Sep 14.
Formaldehyde (HCHO) provides a proxy to reveal the isoprene and biogenic volatile organic compounds emission which plays important roles in atmospheric chemical process and climate change. The ground-based observation with zenith-sky DOAS is carried out in order to validate the HCHO columns from OMI. It has a good correlation of 0.71678 between the HCHO columns from two sources. Then we use the OMI HCHO columns from January 2006 to December 2015 to indicate the interannual variation and spatial distribution in Xishuangbanna. The HCHO concentration peaks appeared in March or April for each year significantly corresponding to the intensive fire counts at the same time, which illustrate that the high HCHO columns are strongly influenced by the biomass burning in spring. Temperature and precipitation are also the important influence factors in the seasonal variation when there is nearly no biomass burning. The spatial patterns over the past ten years strengthen the deduction from the temporal variation and show the relationship with land cover and land use, elevation and population density. It is concluded that the biogenic activity plays a role in controlling the background level of HCHO in Xishuangbanna, while biomass burning is the main driving force of high HCHO concentration. And forests are greater contributor to HCHO rather than rubber trees which cover over 20% of the land in the region. Moreover, uncertainties from HCHO slant column retrieval and AMFs calculation are discussed in detail.
甲醛（HCHO）提供了一个代理，以揭示异戊二烯和生物挥发性有机化合物的排放，这些排放对大气化学过程和气候变化起着重要作用。为了验证 OMI 的 HCHO 柱，进行了基于天顶的 DOAS 地面观测。两个来源的 HCHO 柱之间存在很好的相关性，相关系数为 0.71678。然后，我们使用 OMI 从 2006 年 1 月到 2015 年 12 月的 HCHO 柱来表示西双版纳的年际变化和空间分布。每年的 HCHO 浓度峰值出现在 3 月或 4 月，与同期密集的火灾次数明显相关，这表明高 HCHO 柱受到春季生物质燃烧的强烈影响。在几乎没有生物质燃烧的季节变化中，温度和降水也是重要的影响因素。过去十年的空间格局加强了从时间变化中得出的推论，并显示出与土地覆盖和土地利用、海拔和人口密度的关系。结论是，生物活动在控制西双版纳 HCHO 的背景水平方面起着作用，而生物质燃烧是高 HCHO 浓度的主要驱动力。森林对 HCHO 的贡献大于橡胶树，橡胶树覆盖了该地区 20%以上的土地。此外，详细讨论了 HCHO 斜柱反演和 AMFs 计算的不确定性。
