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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.
Based on the OMHCHO remote sensing data products, the spatial and temporal distribution of trophane formaldehyde column concentration in Lanzhou from 2006 to 2016 was analyzed and the factors related to its emission were discussed. The results show that the concentration of formaldehyde column in troposphere is generally on the rise , Of which formaldehyde column concentration increased rapidly from 2006 to 2011 with the maximum growth rate of 21.0%. The formaldehyde column concentration fluctuated slowly from 2012 to 2016, with an average annual growth rate of 5.4% over the 11-year period. The spatial distribution of formaldehyde column concentration showed a negative correlation between Lanzhou The trend of increasing in the western part of the urban area and the adjacent Yongding County to the surrounding areas shows an increase in the concentration level and an expansion of the area from 2006 to 2011. The concentration level and its area are basically unchanged from 2012 to 2015. The year 2016 In the southeastern region of high concentration of formaldehyde column concentration; the highest value of each year in June-August, the largest column concentration in 11 years in July 2011, the lowest value basically occurred in February-April, 11 years The lowest concentration of column appeared in February 2006. The concentration of formaldehyde column in the four seasons was: summer> winter> autumn> spring. The influence of temperature and wind direction on the formation and distribution of formaldehyde in the atmosphere Which is closely related to the increase of formaldehyde concentration. These human factors are the main reasons for the change of formaldehyde concentration in the troposphere.