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Atmos. Meas. Tech., 8, 2775–2788, 2015 /8/2775/2015/ doi:10.5194/amt-8-2775-2015 © Author(s) 2015. CC Attribution 3.0 License. Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer in Tsukuba, Japan 1 2 3 4 4 4 4 2 H. Irie , T. Nakayama , A. Shimizu , A. Yamazaki , T. Nagai , A. Uchiyama , Y. Zaizen , S. Kagamitani , and Y. Matsumi2 1Center for Environmental Remote Sensing, Chiba University, 1–33 Yayoicho, Inage-ku, Chiba 263-8522, Japan 2 Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan 3National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan 4 Climate Research Department, Meteorological Research Institute, Japan Meteorological Agency, 1–1 Nagamine, Tsukuba 305-0052, Japan Correspondence to: H. Irie (hitoshi.irie@chiba-u.jp) Received: 21 January 2015 – Published in Atmos. Meas. Tech. Discuss.: 27 January 2015 Revised: 30 June 2015 – Accepted: 02 July 2015 – Published: 16 July 2015 Abstract. Coincident aerosol observations of multi-axis 1 Introduction differential optical absorption spectroscopy (MAX-DOAS), cavity ring-down spectroscopy (CRDS), lidar, and sky ra- Atmospheric aerosols play a critical role in controlling the diometer were conducted in Tsukuba, Japan, on 5–18 Oc- Earth’s climate and air quality (IPCC, 2013). Due to the tober 2010. MAX-DOAS aerosol retrieval (for aerosol ex- insufficient understanding of their complicated formation tinction coefficient and aerosol optical depth at 476 nm) was mechanisms and effects, there is a growing need to under- evaluated from the viewpoint of the need for a correction stand and measure their optical propert