摘要
PM_(2.5)作为指示环境质量的重要因子之一,不仅影响着灰霾天气的发生,还与公众健康息息相关,近年来受到广泛的关注。尽管PM_(2.5)地面观测站点在不断地扩张,其覆盖范围依旧有限,难以反映全域PM_(2.5)浓度的时空异质性。本研究运用卫星遥感气溶胶光学厚度数据,辅助因子除常规的气象因子等以外,还加入了针对中国人民生产生活习惯的农历日因子,提出一种耦合注意力机制的深度神经网络模型,对长三角区域2015年—2020年PM_(2.5)浓度进行了逐日的高精度估算。模型交叉验证结果显示决定系数R2高达0.85,斜率0.86,与地面站点观测值有较高的一致性,优于多元线性回归和随机森林模型。长三角区域PM_(2.5)浓度时空特征分析结果表明,PM_(2.5)浓度在空间上呈现北高南低的趋势;季节特征以冬季浓度最高,夏季浓度最低,春秋过渡。此外,长三角区域2015年—2020年整体PM_(2.5)浓度呈下降趋势,其中以上海市最为明显,下降速率为3.30μg/(m^(3)·a),其次为江苏省(2.65μg/(m^(3)·a));浙江省与安徽省下降速率都小于2μg/(m^(3)·a),但由于安徽省PM_(2.5)浓度远高于浙江省,提升空间更大,需要更多的关注。综上所述,利用卫星数据结合本研究提出的方法能弥补地面观测站点的不足,获得高精度全域PM_(2.5)浓度时空分布特征,从而更科学地指导相关政策的规划与落地。
PM_(2.5),as the primary indicator of environmental quality,not only affects the occurrence of haze but also is closely related to public health and has raised great attention recently.Although PM_(2.5) ground monitoring stations are expanding,they are still on the sparse side to identify the spatiotemporal heterogeneity of PM_(2.5) concentrations.With the development of remote sensing technology,satellite-based Aerosol Optical Depth(AOD)data provide an effective way to estimate large-scale PM_(2.5) concentrations.This study aims to develop a novel deep neural network model for estimating PM_(2.5) concentrations in the Yangtze River Delta(YRD).In addition to satellite remote sensing AOD data,meteorological factors,digital elevation model data,normalized different vegetation index data,and the lunar calendar day representing Chinese production and living habits were integrated into the proposed attention-based Self-Adaptive Deep Neural Network(SADNN)in this study to estimate PM_(2.5) concentrations in the YRD region from 2015 to 2020.Fivefold cross-validation was executed to evaluate the estimation accuracy of the SADNN.The multiple linear regression and random forest models were applied to compare with the SADNN.The cross-validation results showed the proposed SADNN model had a high coefficient of determination value of 0.85 and a slope of 0.86,which were highly consistent with ground-level observations.The results also showed better performance than those of multiple linear regression and random forest models.The results for the spring festival in 2016 demonstrated the effectiveness of integrating the lunar calendar day and attention module into the model.The spatiotemporal patterns of PM_(2.5)in the YRD were as follows:PM_(2.5)concentrations were high in the north and low in the south,and the coastal and mountainous areas were better than inland and plain areas,respectively.On seasonal scales,winter was the most polluted season,while summer was the best.The overall PM_(2.5)concentration in the YRD showed a decre
作者
陈镔捷
叶扬
林溢
游诗雪
邓劲松
杨武
王珂
CHEN Binjie;YE Yang;LIN Yi;YOU Shixue;DENG Jinsong;YANG Wu;WANG Ke(College of Environment and Resource Sciences,Zhejiang University,Hangzhou 310058,China;College of Environment,Zhejiang University of Technology,Hangzhou 310014,China;Zhejiang Ecological Civilization Academy,Anji 313300,China;Center for Intelligent Ecology and Sustainability,Zhejiang University,Hangzhou 310058,China)
出处
《遥感学报》
EI
CSCD
北大核心
2022年第5期1027-1038,共12页
NATIONAL REMOTE SENSING BULLETIN
基金
国家重点研发计划(编号:2020YFC1807500)
浙江省重点研发计划(编号:2022C03078)。
