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中国地区AERONET站点数据的使用概述 被引量:5
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作者 戴一枫 张广何 韦旭 《科技创新导报》 2018年第6期153-156,共4页
AERONET气溶胶观测数据对于卫星遥感气溶胶数据的验证和评估有着重要意义。本文梳理了中国地区AERONET站点的分布情况,统计了中国境内具有level2.0的AOD数据的时空分布,介绍了中国主要AERONET站点AOD数据的可获得性以及加密观测的情况... AERONET气溶胶观测数据对于卫星遥感气溶胶数据的验证和评估有着重要意义。本文梳理了中国地区AERONET站点的分布情况,统计了中国境内具有level2.0的AOD数据的时空分布,介绍了中国主要AERONET站点AOD数据的可获得性以及加密观测的情况。并回顾了近期中国地区AERONET主要站点数据的使用情况以及有代表性的研究结果。统计结果发现中国地区已有研究使用的AERONET二级AOD数据主要集中在SACOL站、北京站、香河站、兴隆站、太湖站等观测时间序列超过3年的AERONET站点。研究领域涉及中国气溶胶光学特性研究鉴定、卫星反演及数值模式产品的验证和评估、环境和辐射效应的研究等多个方面。 展开更多
关键词 溶胶光学厚度 AOD AERONET 气溶胶观测数据
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Effects of polarization calibration on aerosol optical depth retrieval: An ocean case sensitivity analysis 被引量:1
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作者 LIU TianYue CHI TianHe CHEN Wei 《Science China Earth Sciences》 SCIE EI CAS CSCD 2015年第6期939-948,共10页
Reflectance measurements of both the visible and infrared bands of passive remote sensing sensors are widely used to retrieve aerosol optical depth(AOD) information. This is performed commonly for data obtained over b... Reflectance measurements of both the visible and infrared bands of passive remote sensing sensors are widely used to retrieve aerosol optical depth(AOD) information. This is performed commonly for data obtained over both ocean and land, and these measurements allow for the off line development of a lookup table using radiative transfer models. Owing to molecular and aerosol effects, the reflected light received by the sensor is usually highly polarized. The linear polarization effect may be up to 100%, and the polarization factor of a sensor optical system will change the total intensity as well as the polarization status of the signal reaching the detector. The detector response will be different when the incident light polarization status changes, even if the total intensity remains constant. However, if the polarization calibration is neglected, it will cause obvious errors in the aerosol data retrieval. This is especially true for aerosol optical depth retrieval over an ocean. This measurement relies directly on the reflectance output of the sensor. Cases involving land surfaces are not discussed herein because the inhomogeneous properties conceal the error due to polarization. Taking the 550 and 860 nm bands as examples, the difference between the real top-of-atmosphere(TOA) reflectance and the reflectance reaching the detector is calculated using three different sensor polarization standards according to the Sea-viewing Wide Field-of-view Sensor(Sea Wi FS) and Moderate Resolution Imaging Spectroradiometer(MODIS) standards. The differences in AOD retrieval are also demonstrated using the lookup table developed previously from a vector radiative transfer code. The results reveal that under a normal situation in which the AOD is 0.15, the maximum AOD retrieval error could reach 0.04 in 550 nm but only 0.02 in 860 nm for the dust aerosol model. For the soot aerosol model, the maximum AOD retrieval error is 0.1 in 550 nm and 0.12 in 860 nm, indicating that the lack of polarization calibration will lead to large errors in aerosol retrieval over an ocean. 展开更多
关键词 AEROSOL POLARIZATION CALIBRATION radiative transfer
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