2010-2019年粤港澳大湾区甲醛柱浓度时空分布及影响因子研究

基于Aura卫星OMI传感器的甲醛逐日数据,开展了2010—2019年粤港澳大湾区对流层甲醛垂直柱浓度的时空变化研究,并应用气象、植被和社会经济数据,对甲醛柱浓度变化的影响因子进行了分析.结果表明:2010—2019年粤港澳大湾区甲醛柱浓度呈波动起伏的变化特征,季节均值变化趋势与年度均值变化趋势相似,秋季季节浓度均值最高,其后依次为春季、夏季、冬季;在空间上,2010—2019年甲醛柱浓度均呈现自西北向东南逐渐降低的趋势,在甲醛柱浓度变化趋势上,粤港澳大湾区大部分区域呈现缓慢增加的趋势;针对不同土地覆盖类型,春季,绿地上空甲醛柱浓度高于建筑用地与耕地,夏、秋、冬季,建筑用地上空甲醛柱浓度略高;在空间分布稳定性上,受地形、土地覆盖类型和气象条件影响,西北部稳定性较强,南部珠江入海口处稳定性较弱;自然因子和人为因子对甲醛柱浓度的增长都有一定的贡献,其中,生产总值、汽车保有量、能源消耗量等人为因子对甲醛柱浓度的影响更为显著.

Spatial-temporal distribution of formaldehyde column concentration and its influencing factors in the Guangdong-Hong Kong-Macao Greater Bay Area from 2010 to 2019

Based on the Aura OMI''s formaldehyde column concentration daily products,spatial and temporal distribution of the tropospheric formaldehyde column concentration in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) from 2010 to 2019 was studied.Then,combined with the meteorological,vegetation,and socio-economic data,the influencing factors were analyzed.The results showed that the formaldehyde column concentration of the GBA from 2010 to 2019 presented fluctuating characteristics,and the seasonal average value change showed a similar trend.The average concentration in the autumn was the highest,followed by spring,summer,and winter.Spatially,the formaldehyde column concentration showed a gradually decreasing trend from northwest to southeast in the ten years.In terms of the change of formaldehyde column concentration,most regions of the GBA showed a slowly increasing trend.For different land covers,formaldehyde column concentration over green space was higher than cultivated land and construction land in spring.In contrast,the formaldehyde column concentration over construction land was slightly higher than that over green space in the other three seasons.In terms of spatial distribution stability,affected by topography,land covers,and meteorological conditions,the stability of the northwest was relatively strong,and that of the Pearl River Estuary in the south was relatively weak.Both the natural factors and human factors contributed to the growth of formaldehyde column concentration.Human factors such as gross production value,car ownership,and energy consumption had a more significant impact on formaldehyde column concentration.