OMI satellite observed formaldehyde column from 2006 to 2015 over Xishuangbanna, southwest China, and validation using ground based zenith-sky DOAS.
OMI satellite observed formaldehyde column from 2006 to 2015 over Xishuangbanna, southwest China, and validation using ground based zenith-sky DOAS.
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DOI：
10.1016/j.scitotenv.2017.08.210
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
Rui Liu;Tao Feng;Shanshan Wang;Chanzhen Shi;Yanlin Guo;J. Nan;Yun Deng;Bin Zhou
中科院分区：
文献类型：
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作者：
Rui Liu;Tao Feng;Shanshan Wang;Chanzhen Shi;Yanlin Guo;J. Nan;Yun Deng;Bin Zhou
甲醛(HCHO)为揭示异戊二烯和生物源挥发性有机化合物的排放提供了一个替代物，在大气化学过程和气候变化中发挥着重要作用。为了验证来自OMI的HCHO柱的有效性，利用天顶-天空DOA进行了地面观测。两种来源的甲醛色谱柱之间的相关性很好，达到0.71678。然后利用2006年1月至2015年12月的OMI HCHO柱显示了西双版纳的年际变化和空间分布。甲醛浓度峰值出现在每年的3、4月份，与同时发生的火灾强度有显著的对应关系，说明春季生物质燃烧对甲醛浓度的影响较大。在几乎没有生物质燃烧的情况下，温度和降水也是季节变化的重要影响因素。近10年来的空间格局加强了对时间变化的推断，并显示了与土地覆盖和土地利用、海拔和人口密度的关系。结果表明，生物源活动对西双版纳空气中甲醛的本底水平起着控制作用，生物质燃烧是甲醛浓度偏高的主要驱动力。森林比橡胶树对六六六的贡献更大，橡胶树覆盖了该地区超过20%的土地。此外，还详细讨论了HCHO斜柱反演和AMFS计算的不确定度。
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.