Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan
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 op...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-07-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/8/2775/2015/amt-8-2775-2015.pdf |
| _version_ | 1818547477760966656 |
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| author | H. Irie T. Nakayama A. Shimizu A. Yamazaki T. Nagai A. Uchiyama Y. Zaizen S. Kagamitani Y. Matsumi |
| author_facet | H. Irie T. Nakayama A. Shimizu A. Yamazaki T. Nagai A. Uchiyama Y. Zaizen S. Kagamitani Y. Matsumi |
| author_sort | H. Irie |
| collection | DOAJ |
| description | 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 (O<sub>4</sub> or
O<sub>2</sub>–O<sub>2</sub>) 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 (<i>f</i><sub>O<sub>4</sub></sub> = 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 O<sub>4</sub> 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. |
| first_indexed | 2024-12-12T08:07:15Z |
| format | Article |
| id | doaj.art-47fb4c32fe094a10bd8b8ab605f7eb3b |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-12T08:07:15Z |
| publishDate | 2015-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-47fb4c32fe094a10bd8b8ab605f7eb3b2022-12-22T00:31:54ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482015-07-01872775278810.5194/amt-8-2775-2015Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, JapanH. Irie0T. Nakayama1A. Shimizu2A. Yamazaki3T. Nagai4A. Uchiyama5Y. Zaizen6S. Kagamitani7Y. Matsumi8Center for Environmental Remote Sensing, Chiba University, 1–33 Yayoicho, Inage-ku, Chiba 263-8522, JapanSolar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, JapanNational Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305-8506, JapanClimate Research Department, Meteorological Research Institute, Japan Meteorological Agency, 1–1 Nagamine, Tsukuba 305-0052, JapanClimate Research Department, Meteorological Research Institute, Japan Meteorological Agency, 1–1 Nagamine, Tsukuba 305-0052, JapanClimate Research Department, Meteorological Research Institute, Japan Meteorological Agency, 1–1 Nagamine, Tsukuba 305-0052, JapanClimate Research Department, Meteorological Research Institute, Japan Meteorological Agency, 1–1 Nagamine, Tsukuba 305-0052, JapanSolar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, JapanSolar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, JapanCoincident 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 (O<sub>4</sub> or O<sub>2</sub>–O<sub>2</sub>) 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 (<i>f</i><sub>O<sub>4</sub></sub> = 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 O<sub>4</sub> 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.http://www.atmos-meas-tech.net/8/2775/2015/amt-8-2775-2015.pdf |
| spellingShingle | H. Irie T. Nakayama A. Shimizu A. Yamazaki T. Nagai A. Uchiyama Y. Zaizen S. Kagamitani Y. Matsumi Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan Atmospheric Measurement Techniques |
| title | Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan |
| title_full | Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan |
| title_fullStr | Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan |
| title_full_unstemmed | Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan |
| title_short | Evaluation of MAX-DOAS aerosol retrievals by coincident observations using CRDS, lidar, and sky radiometer inTsukuba, Japan |
| title_sort | evaluation of max doas aerosol retrievals by coincident observations using crds lidar and sky radiometer intsukuba japan |
| url | http://www.atmos-meas-tech.net/8/2775/2015/amt-8-2775-2015.pdf |
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