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Ground-based Multi-Axis Differential Optical Absorption Spectroscopy(MAX-DOAS) measurements were performed at Tsukuba, Japan (36.1° N,140.1° E), in November–December 2006. By analyzing the measured spectraof scattered sunlight with DOAS and optimal estimation methods, we firstretrieve the aerosol optical depth (τ) and the vertical profile of theaerosol extinction coefficient (k) at 476 nm in the lower troposphere. Theseretrieved quantities are characterized through comparisons with coincidentlidar and sky radiometer measurements. The retrieved k values for layers of0–1 and 1–2 km agree with lidar data to within 30% and 60%,respectively, for most cases, including partly cloudy conditions. Resultssimilar to k at 0–1 km are obtained for the retrieved τ values,demonstrating that MAX-DOAS provides a new, unique aerosol dataset in thelower troposphere

First retrieval of tropospheric aerosol profiles using MAX-DOAS and comparison with lidar and sky radiometer measurements