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| Titel |
DIAL measurement of lower tropospheric ozone over Saga (33.24° N, 130.29° E), Japan, and comparison with a chemistry–climate model |
| VerfasserIn |
O. Uchino, T. Sakai, T. Nagai, I. Morino, T. Maki, M. Deushi, K. Shibata, M. Kajino, T. Kawasaki, T. Akaho, S. Takubo, H. Okumura, K. Arai, M. Nakazato, T. Matsunaga, T. Yokota, S. Kawakami, K. Kita, Y. Sasano |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 5 ; Nr. 7, no. 5 (2014-05-21), S.1385-1394 |
| Datensatznummer |
250115763
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| Publikation (Nr.) |
 copernicus.org/amt-7-1385-2014.pdf |
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| Zusammenfassung |
We have improved an ozone DIfferential Absorption Lidar (DIAL) system,
originally developed in March 2010. The improved DIAL system consists of a
Nd:YAG laser and a 2 m Raman cell filled with 8.1 × 105 Pa
of CO2 gas which generate four Stokes lines (276, 287, 299, and 312 nm)
of stimulated Raman scattering, and two receiving telescopes with diameters
of 49 and 10 cm. Using this system, 44 ozone profiles were observed in the
1–6 km altitude range over Saga (33.24° N, 130.29° E)
in 2012. High-ozone layers were observed at around 2 km altitude during
April and May. Ozone column amounts within the 1–6 km altitude range were
almost constant (19.1 DU on average) from January to March, and increased to
26.7 DU from late April to July. From mid-July through August, ozone column
amounts decreased greatly to 14.3 DU because of exchanges of continental and
maritime air masses. Then in mid-September they increased again to 22.1 DU
within 1−6 km, and subsequently decreased slowly to 17.3 DU, becoming
almost constant by December.
The Meteorological Research Institute's chemistry–climate model version 2
(MRI-CCM2) successfully predicted most of these ozone variations with the
following exceptions. MRI-CCM2 could not predict the high-ozone volume
mixing ratios measured at around 2 km altitude on 5 May and 11 May, possibly
in part because emissions were assumed in the model to be constant
(climatological data were used). Ozone volume mixing ratios predicted by
MRI-CCM2 were low in the 2–6 km range on 7 July and high in the
1–4 km range on 19 July compared with those measured by DIAL. |
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