MAX-DOAS measurements of atmospheric trace gases in Ny- ˚ Alesund - Radiative transfer studies and their application
MAX-DOAS measurements of atmospheric trace gases in Ny- ˚ Alesund - Radiative transfer studies and their application
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DOI：
10.5194/acp-4-955-2004
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发表时间：
2004-06
影响因子：
6.3
通讯作者：
F. Wittrock;H. Oetjen;A. Richter;S. Fietkau;T. Medeke;A. Rozanov;J. P. Burrows
中科院分区：
文献类型：
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作者：
F. Wittrock;H. Oetjen;A. Richter;S. Fietkau;T. Medeke;A. Rozanov;J. P. Burrows
本文介绍了一种利用地基紫外/维斯观测资料反演对流层某些痕量气体浓度的新方法。该仪器被称为MAX-DOAS，基于众所周知的紫外/维斯仪器，其使用天顶天空中散射的太阳光作为光源和差分光学吸收光谱法（DOAS）来获得吸收剂（如臭氧和二氧化氮）的柱量。大量的增强已经应用到这个标准设置，使用不同的视线接近地平线作为额外的光源（最大-多轴）。本文介绍了在纽约奥勒松（79 N，12 E）的测量结果，并用全球面辐射传输模型SCIATRAN进行了解释。特别地，利用在大气中具有已知的垂直和垂直分布的氧二聚体O 4的测量值来评估反演对诸如多次散射、太阳方位角、地面散射和大气折射等参数的敏感性，并验证辐射传输模型。作为第一个应用程序，测量NO2排放量的船舶躺在纽约-奥勒松港。本研究的结果表明，长期的UV/维斯多轴测量的可行性，可以用来获得不仅是不同的微量气体的柱量，但这些吸收剂的垂直位置的一些信息。
A new approach to derive tropospheric concen- trations of some atmospheric trace gases from ground-based UV/vis measurements is described. The instrument, referred to as the MAX-DOAS, is based on the well-known UV/vis instruments, which use the sunlight scattered in the zenith sky as the light source and the method of Differential Optical Absorption Spectroscopy (DOAS) to derive column amounts of absorbers like ozone and nitrogen dioxide. Substantial en- hancements have been applied to this standard setup to use different lines of sight near to the horizon as additional light sources (MAX - multi axis). Results from measurements at Ny- ˚ Alesund (79 N, 12 E) are presented and interpreted with the full-spherical radiative transfer model SCIATRAN. In particular, measurements of the oxygen dimer O4 which has a known column and vertical distribution in the atmo- sphere are used to evaluate the sensitivity of the retrieval to parameters such as multiple scattering, solar azimuth, surface albedo and refraction in the atmosphere and also to validate the radiative transfer model. As a first application, measure- ments of NO2 emissions from a ship lying in Ny- ˚ Alesund harbour are presented. The results of this study demonstrate the feasibility of long term UV/vis multi axis measurement that can be used to derive not only column amounts of dif- ferent trace gases but also some information on the vertical location of these absorbers.