基于OMI数据的兰州地区对流层甲醛时空变化研究

基于OMHCHO遥感数据产品,对兰州地区2006—2016年对流层甲醛柱浓度的时空分布进行了分析,并对与其排放相关的因素进行了探讨,结果表明:2006—2016年对流层甲醛柱浓度整体呈上升趋势,其中2006—2011年甲醛柱浓度增加迅速,最大增长率为21.0%,2012—2016年甲醛柱浓度平缓波动上升,11年中年均增长率为5.4%;空间上甲醛柱浓度整体呈现由兰州市区西部及与其相邻的永登县部分区域向周边区域递增的趋势,2006—2011年表现为浓度级的增加和区域的扩大,2012—2015年浓度级及其区域基本不变,2016年在东南部出现高值甲醛柱浓度区;每年的最高值出现在6—8月份,11年中最大的柱浓度值出现在2011年的7月份,最低值基本出现在2—4月份,11年中最低的柱浓度值出现在2006年的2月份;四季对流层甲醛柱浓度水平为:夏季冬季秋季春季;影响因素中气温和风向对大气中甲醛的生成和分布有着促进作用,兰州地区生产总值及各产业增加值,尤其是工业产值和机动车保有量的增加,与甲醛柱浓度升高密切相关,这些人为因素是对流层中甲醛柱浓度变化的主要原因.

Temporal and spatial variations of tropospheric formaldehyde in Lanzhou aera based on remote sensing data

The characteristics of the spatial and temporal distribution of tropospheric formaldehyde column concentration in the Lanzhou area from 2006 to 2016 were analyzed through OMHCHO satellite remote sensing data,and the factors related to its emission were discussed.The results showed an upward trend of tropospheric formaldehyde column concentration during 2006 to 2016. Particularly during 2006 to 2011, the concentration of formaldehyde column increased rapidly,and the maximum annual growth rate was 21.0%.Moreover,the growth showed smooth fluctuations rose during 2012 to 2016,and the average annual growth rate was 5.4% in 11 years.Spatially,the concentration of formaldehyde column showed a tendency of increasing in the western part of the city of Lanzhou and within the adjacent Yongdeng County,and it continued to spread to the surrounding areas.From 2006 to 2011,the growth in concentration level and the expansion of the area were observed.The concentration level and its area remained unchanged from 2012 to 2015.In 2016,there was a high concentration of formaldehyde column in Lanzhou''s southeastern region.The highest value appeared during the months between June to August,with the largest column concentration in 11 years appearing in July of 2011.The lowest value appeared in February to April,with the lowest column concentration in 11 years appearing in February of 2006.The comparison of the concentration level of formaldehyde column in the four seasons was:Summer> Winter> Autumn> Spring.The influencing factors showed that the temperature and wind direction had a positive effect on the formation and distribution of formaldehyde in the atmosphere.The study demonstrated the sources for the surge in formaldehyde concentration,which included: the GDP and industrial added value for the Lanzhou area,the industrial output value,and the increase of motor vehicle ownership.