Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan
Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan
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DOI：
10.5194/amt-8-2775-2015
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发表时间：
2015-07
影响因子：
3.8
通讯作者：
H. Irie;T. Nakayama;A. Shimizu;A. Yamazaki;T. Nagai;A. Uchiyama;Y. Zaizen;S. Kagamitani;Y. Matsumi
中科院分区：
文献类型：
--
作者：
H. Irie;T. Nakayama;A. Shimizu;A. Yamazaki;T. Nagai;A. Uchiyama;Y. Zaizen;S. Kagamitani;Y. Matsumi
抽象的。2010年10月5日至18日，在日本筑波进行了多轴差分光学吸收光谱（MAX-DOAS）、光腔衰荡光谱（CRDS）、激光雷达和天空辐射计的一致气溶胶观测。MAX-DOAS气溶胶反演（气溶胶消光系数和气溶胶光学厚度在476 nm）进行了评价的角度来看，需要一个校正因子的氧碰撞复合物（O 4或O2-O2）的吸收。本研究强烈支持这一需要，因为在相对高的仰角（20 °和30°）的系统残差是明显的MAX-DOAS剖面反演进行没有校正。然而，采用一个单一的数字的校正因子（fO 4 = 1.25）的所有仰角导致系统高估近地面气溶胶消光系数，在文献中报道。为了实现与所有三个观测结果的一致性，我们将仰角限制为≤10°，并采用了一个依赖于仰角的校正因子，用于地面MAX-DOAS散射光观测的实际剖面反演。有了这些修改，我们希望尽量减少可能的影响，温度依赖性O 4吸收截面和不确定性的DOAS适合气溶胶剖面检索，虽然更多的努力，鼓励定量确定一个物理解释的需要一个校正因子。
Abstract. Coincident aerosol observations of multi-axis differential optical absorption spectroscopy (MAX-DOAS), cavity ring-down spectroscopy (CRDS), lidar, and sky radiometer were conducted in Tsukuba, Japan, on 5–18 October 2010. MAX-DOAS aerosol retrieval (for aerosol extinction coefficient and aerosol optical depth at 476 nm) was evaluated from the viewpoint of the need for a correction factor for oxygen collision complexes (O4 or O2–O2) absorption. The present study strongly supports this need, as systematic residuals at relatively high elevation angles (20 and 30°) were evident in MAX-DOAS profile retrievals conducted without the correction. However, adopting a single number for the correction factor (fO4 = 1.25) for all of the elevation angles led to systematic overestimation of near-surface aerosol extinction coefficients, as reported in the literature. To achieve agreement with all three observations, we limited the set of elevation angles to ≤10° and adopted an elevation-angle-dependent correction factor for practical profile retrievals with scattered light observations by a ground-based MAX-DOAS. With these modifications, we expect to minimize the possible effects of temperature-dependent O4 absorption cross section and uncertainty in DOAS fit on an aerosol profile retrieval, although more efforts are encouraged to quantitatively identify a physical explanation for the need of a correction factor.