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杭州市大气气溶胶光学特性研究

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利用太阳分光光度计(CE-318)对杭州市地面的气溶胶光学特性进行观测,并对卫星反演的中分辨率成像光谱仪(Moderate Resolution Imaging Spectroradiometer,MODIS)气溶胶产品进行验证.结果表明,MODIS气溶胶产品在杭州地区的精度较高,3个站点全部数据回归曲线的斜率和截距分别为1.02和-0.14(RSME=0.22,R2=0.71).在此基础上,利用MODIS数据分析了杭州市气溶胶光学特性的时空特征.结果发现,在长时间变化尺度上,气溶胶光学厚度(AOT)逐渐增加,而且波动较大;ngstrm指数(α值)比较平稳,没有明显的变化趋势,但是周期性较为明显.AOT和α值的季节变化特征明显,AOT的最大值和最小值分别出现在春季和冬季,分别为0.56±0.19和0.39±0.15;α值的最大值和最小值分别出现在夏季和春季,分别为1.56±0.23和1.07±0.20.在空间上,以城市/工业型气溶胶为主的杭州市区的AOT(0.76)较大,α值(1.01)较小;而植被覆盖较多、人为影响较小且以自然型气溶胶为主的地区的AOT(0.41)较小,α值(1.43)较大.整个杭州市春季的AOT普遍高于其它季节,α值相反.
Monitoring the aerosol optical properties over Hangzhou using remote sensing data
We performed long term monitoring of aerosol optical properties using a sun photometer(CE-318) in Hangzhou,and these ground-based remote sensing data were used to validate the Moderate Resolution Imaging Spectroradiometer(MODIS) aerosol products.The results indicated that the MODIS aerosol product has high accuracy in monitoring the spatial-temporal dynamics of the aerosol over Hangzhou.The slope and intercept of the linear regression of all data from three data monitoring sites and the MODIS aerosol products are 1.02 and-0.14(RSME=0.22,R2=0.71),respectively.MODIS aerosol products were used to analyze the characteristics of aerosol properties over Hangzhou after they were evaluated.For the temporal evolution,the aerosol optical thickness(AOT) increased with strong fluctuation,while the ngstrm exponent(α) value was more stable than AOT,and showed no obvious trend,but a periodic variation.Both AOT and the α value presented remarkable seasonal variation on the temporal scale.The largest AOT appears in spring(0.56±0.19) and the smallest AOT appears in winter(0.39±0.15),however the largest and smallest α appear in summer and spring at 1.56±0.23 and 1.07±0.20,respectively.For the spatial distribution,the aerosol properties have higher AOT(0.76) and lower α(1.01) value in urban areas with industrial/urban characteristics,while the lower AOT(0.41) and higher α value(1.43) areas are observed over dense vegetation or areas with less anthropogenic activity.For the entire region,the AOTs in spring are generally higher than other seasons,while the α value shows the inverse.

Hangzhou cityaerosol optical thicknessngstrm exponentMODISSun photometer

肖钟湧、江洪、陈健、王彬、江子山

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南京大学国际地球系统科学研究所,南京210093

南京大学国际地球系统科学研究所,南京210093 浙江农林大学亚热带森林培育国家重点实验室/浙江省森林生态系统碳循环与固碳减排重点实验室,杭州311300

浙江农林大学亚热带森林培育国家重点实验室/浙江省森林生态系统碳循环与固碳减排重点实验室,杭州311300

杭州市 气溶胶光学厚度 ngstrm指数 中分辨率成像光谱仪(MODIS) 太阳分光光度计

国家重点基础研究发展规划(973计划)重大国际合作项目国家高技术研究发展计划(863计划)科技部重大基础性项目浙江省重大科技专项项目

2010CB950702 2010CB4285032000738192009AA122001 2009AA1220052007FY110300-82008C13G2100010

2011

环境科学学报
中国科学院生态环境研究中心

环境科学学报

CSTPCDCSCD北大核心
影响因子:1.645
ISSN:0253-2468
年,卷(期):2011.31(8)
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