近12年华北五省区域对流层甲醛柱浓度时空变化及影响因素

利用臭氧监测仪(OMI)卫星反演的甲醛柱浓度产品,探讨了2005—2016年间华北五省区域对流层甲醛柱浓度的时空分布变化特征及相关的影响因子,结果表明:近12年对流层甲醛柱浓度整体呈现上升趋势,2005—2011年甲醛柱浓度呈逐渐升高趋势,最高增长达32.24×1013mole·cm~(-2),且高值区逐渐扩大.空间分布上高值区整体分布在北京、天津及周围区域,低值区分布在河北的北部、河南的南部和山东的东部区域;2012—2016年甲醛柱浓度波动较小,呈下降趋势.12年中,每年的2—4月份甲醛柱浓度出现最小值,6—8月份甲醛柱浓度出现最大值,而2005年2月份甲醛柱浓度值最小,2011年7月份甲醛柱浓度值最大.四季对流层甲醛浓度水平:夏季秋季春季冬季.风向会影响甲醛浓度的扩散方向,气温的增加导致甲醛柱浓度的升高.但12年间区域生产总值的提高、汽车保有量增加和农业秸秆焚烧是影响甲醛柱浓度增加的主导因素.

Spatio-temporal change and influencing factors of tropospheric HCHO column density of the five Provinces of North China in the 12 years

The characteristics of the spatial and temporal distribution of tropospheric formaldehyd column concent ration were analyzed through OMHCHO satellite remote sensing data, and the factors related to its emission were discussed from 2005 to 2016 in the five Provinces of North China. The results showed that formaldehyde column concentration of the troposphere had a rising trend in the past 12 years. In 2005-2011, the concentration of formaldehyde column increased gradually, the maximum value was 32.24×10¹³ mole·cm^-2, and the high value area was gradually expanded. In space, high value areas were distributed in Beijing, Tianjin and adjacent areas, and low value areas were distributed in Northern Hebei, southern Henan and Eastern Shandong. The concentration of formaldehyde column decreased in 2012-2016, and the fluctuation was smaller, the concentration of formaldehyde column was minimum in 2~4 month of each year. In the past twelve years, the formaldehyde concentration showed the minimum value in the 2~4 months of the year. The maximum value of formaldehyde column appeared in 6~8 months, but in 2005, the concentration of formaldehyde column was the smallest in February, and the largest in July 2011. The comparison of the concentration level of formaldehyde column were:Summer > Autumn > Spring > Winter in the four seasons. The wind direction affected the diffusion direction of the formaldehyde concentration, and the increase of the temperature led to the increase of the concentration of the formaldehyde column. However, in the past 12 years, the increase in GDP, the increase of car ownership and the incineration of agricultural straw were the leading factors that affect the increase of the concentration of the formaldehyde column.