Atmospheric Chemistry and Physics Discussions
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2008
10.5194/acpd-8-19357-2008
http://www.atmos-chem-phys-discuss.net/8/19357/2008/
http://www.atmos-chem-phys-discuss.net/8/19357/2008/acpd-8-19357-2008.html
http://www.atmos-chem-phys-discuss.net/8/19357/2008/acpd-8-19357-2008.pdf
19357
19375
2008-11-14
Dual-wavelength aerosol vertical profile measurements by MAX-DOAS at Tsukuba, Japan
H. Irie
irie@jamstec.go.jp
Y. Kanaya
H. Akimoto
H. Iwabuchi
A. Shimizu
K. Aoki
Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan
National Inst. for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Department of Earth Science, Faculty of Sciences, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
We present vertical profiles of the aerosol extinction coefficient retrieved
from ground-based Multi-Axis Differential Optical Absorption Spectroscopy
(MAX-DOAS) measurements at Tsukuba, Japan (36.1° N, 140.1° E), from
November 2006 to March 2007. Retrievals utilizing absorption by the oxygen
collision complex O<sub>4</sub> are first made at two wavelengths, 354 and 476 nm.
A robust assessment of the MAX-DOAS aerosol data is made using coincident
lidar measurements throughout the period. Agreement between aerosol
extinction coefficients measured by MAX-DOAS and the lidar tends to be
better at the longer wavelength and at lower altitudes. At 476 nm, the best
agreement, to within 30%, is found at altitudes of 0–1 km, confirming
results from a literature assessment for a two-month measurement period.
These findings are supported by comparisons of the aerosol optical depth by
MAX-DOAS and sky radiometer measurements and are further explained by
differences in the O<sub>4</sub> absorption and the air mass factor profile
between 354 and 476 nm. Thus, uncertainty in MAX-DOAS aerosol measurements
is well quantified and characterized, providing a basis for quantitative
studies using MAX-DOAS measurements.
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