基于卫星遥感的湖南省甲醛时空分布及影响因素分析

利用OMI遥感的甲醛逐日数据、MODIS传感器监测的NDVI数据以及湖南省能源消耗和氮氧化物排放量数据，对2009～2017年湖南省对流层大气中甲醛柱浓度时空变化特征及其影响因素进行了探究。结果表明：湖南省甲醛柱浓度总体空间分布具有西部山区低、北部洞庭湖平原和南部南岭地区高的特征；近九年湖南省甲醛柱浓度时间分布呈先增加后减小的趋势，最高值出现在2012年，最低值出现在2017年；年内甲醛柱浓度值夏季最高，秋季、春季次之，冬季最低，最低值出现在12月，最高值出现于9月；影响因素中地形与风向因素对甲醛柱浓度的空间分布有一定的影响，甲醛柱浓度与温度的相关性较高，降水次之，植被对甲醛的产生有很大的贡献，能源消耗与氮氧化物排放是湖南省甲醛柱浓度变化的重要人为因素。

Spatial-temporal Distribution of Formaldehyde in Hunan, China and Its Influence Factors Analysis Based on Satellite Remote Sensing Data

This study investigated the temporal and spatial distribution characteristics of formaldehyde column concentrations in troposphere in Hunan, China from 2009 to 2017 and explored the influence factors by comprehensive analyses on daily formaldehyde data monitored by OMI sensors, NDVI data monitored by MODIS sensors, energy consumption data and nitrogen oxide emission data of the Hunan Province. The results showed that the overall spatial distribution of formaldehyde column concentration in Hunan was that the formaldehyde column concentration was low in the western mountainous area and was high in the north Dongting Lake plain and the southern Nanling area. During the past 9 years, formaldehyde column concentrations in Hunan showed a trend of increasing and then decreasing with the highest concentration appeared in 2012 and the lowest concentration appeared in 2017. The formaldehyde column concentration varied seasonally, highest in summer and lowest in winter, the highest concentration appeared in September and the lowest concentration appeared in December. The topography and the wind direction showed certain influences on the spatial distribution of formaldehyde column concentration, the formaldehyde column concentration showed a strong correlation with temperature and a good correlation with precipitation, vegetation was an important formaldehyde contributor, while the energy consumption and the nitrogen oxide emission in Hunan were of important anthropogenic factors.