Intercomparison of aerosol extinction profiles retrieved from MAX-DOAS measurements
Intercomparison of aerosol extinction profiles retrieved from MAX-DOAS measurements
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DOI：
10.5194/amt-9-3205-2016
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发表时间：
2016-07
影响因子：
3.8
通讯作者：
U. Friess;H. Baltink;S. Beirle;K. Clémer;F. Hendrick;B. Henzing;H. Irie;G. Leeuw;A. Li;M. Moerman;M. Roozendael;R. Shaiganfar;T. Wagner;Yu-Tu Wang;P. Xie;S. Yilmaz;P. Zieger
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文献类型：
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作者：
U. Friess;H. Baltink;S. Beirle;K. Clémer;F. Hendrick;B. Henzing;H. Irie;G. Leeuw;A. Li;M. Moerman;M. Roozendael;R. Shaiganfar;T. Wagner;Yu-Tu Wang;P. Xie;S. Yilmaz;P. Zieger
抽象。介绍了2009年夏季在Cabauw二氧化氮测量仪器比对活动（CINDI）期间进行的多轴差分光学吸收光谱（MAX-DOAS）观测气溶胶垂直廓线的首次直接比对。CINDI活动的14个参与者中有5个报告了气溶胶消光廓线和气溶胶光学厚度（AOT），这是从不同仰角的氧碰撞复合物（O 4）的差分斜柱密度观测中推导出来的。气溶胶消光垂直配置文件和AOT进行了比较，从云高仪仪器和太阳光度计测量的后向散射配置文件，分别。此外，近地表气溶胶消光系数进行了比较，在现场测量的湿度控制浊度计和干气溶胶吸收测量。这次相互比较活动的参与者使用不同的方法来检索气溶胶信息，包括使用最佳估计和具有规定轮廓形状的参数化方法来检索整个垂直轮廓。尽管这些大的概念上的差异，以及所观察到的O 4吸收带的波长的差异，在边界层内的气溶胶的垂直结构方面的良好协议之间实现了气溶胶消光剖面检索由不同的团体和后向散射剖面观测的云高仪仪器。来自MAX-DOAS和太阳光度计的AOT显示出良好的相关性（R>0.8），但所有参与者都系统地低估了AOT。MAX-DOAS和增湿浊度计的近地面气溶胶消光之间的实质性差异在很大程度上仍未得到解决。
Abstract. A first direct intercomparison of aerosol vertical profiles from Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations, performed during the Cabauw Intercomparison Campaign of Nitrogen Dioxide measuring Instruments (CINDI) in summer 2009, is presented. Five out of 14 participants of the CINDI campaign reported aerosol extinction profiles and aerosol optical thickness (AOT) as deduced from observations of differential slant column densities of the oxygen collision complex (O4) at different elevation angles. Aerosol extinction vertical profiles and AOT are compared to backscatter profiles from a ceilometer instrument and to sun photometer measurements, respectively. Furthermore, the near-surface aerosol extinction coefficient is compared to in situ measurements of a humidity-controlled nephelometer and dry aerosol absorption measurements. The participants of this intercomparison exercise use different approaches for the retrieval of aerosol information, including the retrieval of the full vertical profile using optimal estimation and a parametrised approach with a prescribed profile shape. Despite these large conceptual differences, and also differences in the wavelength of the observed O4 absorption band, good agreement in terms of the vertical structure of aerosols within the boundary layer is achieved between the aerosol extinction profiles retrieved by the different groups and the backscatter profiles observed by the ceilometer instrument. AOTs from MAX-DOAS and sun photometer show a good correlation (R>0.8), but all participants systematically underestimate the AOT. Substantial differences between the near-surface aerosol extinction from MAX-DOAS and from the humidified nephelometer remain largely unresolved.