京津冀对流层甲醛的时空演变特征及其影响因素

依据2009—2016年OMI卫星反演的逐日数据,结合遥感图像处理技术和克里金插值法,对京津冀地区对流层甲醛柱浓度的时空特征及影响因素进行了分析.结果发现,2009—2016年8年间京津冀地区甲醛柱浓度年际变化总体呈上升趋势,年均增长率为1.01%,最大增长率出现于2009—2010年,为12.91%.8年间,甲醛柱浓度值具有波动性,最低值和最高值分别出现于2009年和2013年.研究区甲醛柱浓度季节变化表现为夏季值秋季值冬季值春季值,甲醛柱浓度月均值在每年的6月达到最高.甲醛柱浓度空间分布的低值区大多处于地势较高的京津冀地区西北部,高值区主要分布在京津冀地区南部平原.甲醛柱浓度变化不仅与自然因素的温度呈显著正相关,与气压呈显著负相关,还与社会经济因素中的煤炭消耗量、原油消耗量及工业增加值等呈正相关.京津冀地区甲醛柱浓度时空特征总体受当地自然和社会经济因素的综合影响.

Temporal-spatial change and affecting factors of tropospheric formaldehyde over Beijing-Tianjin-Hebei region, China

Based on the daily remote sensing data from OMI satellite sensor during the years of 2009-2016, the temporal and spatial changing characteristics of the formaldehyde vertical columns and their affecting factors in the troposphere over the Beijing-Tianjin-Hebei region were analyzed with the methods of remote sensing image processing technology and Kriging interpolation. An increasing trend of tropospheric formaldehyde column concentration from 2009 to 2016 was shown and their average annual growth rate was 1.17%. The maximum annual growth rate was 12.91% which appeared in the first two years. During the period of 2009-2016, the concentration of formaldehyde column was fluctuating. The maximum and minimum column concentrations occured in 2009 and 2013, respectively.The seasonal concentration level of formaldehyde column over this region showed that the summer''s level > autumn''s level > winter''s level > spring''s level. The monthly mean value of formaldehyde column reached its highest values in June every year. The low and high values of formadehyde column concentration distributed mostly in the northwest of the higher terrain and in the southern plain of this region.The concentration of formaldehyde over this region was positively and negatively correlated with the temperature and air pressure, respectively. It has certain correlation with social and economic factors such as coal consumption, crude oil consumption and industrial increasing values. The temporal and spatial characteristics of the concentration of formaldehyde column over Beijing-Tianjin-Hebei areas were affected generally by the combination of local natural and socio-economic factors.