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| Titel |
NO2 observations over the western Pacific and Indian Ocean by MAX-DOAS on Kaiyo, a Japanese research vessel |
| VerfasserIn |
H. Takashima, H. Irie, Y. Kanaya, F. Syamsudin |
| 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 ; 5, no. 10 ; Nr. 5, no. 10 (2012-10-05), S.2351-2360 |
| Datensatznummer |
250003118
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| Publikation (Nr.) |
 copernicus.org/amt-5-2351-2012.pdf |
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| Zusammenfassung |
| Nitrogen dioxide (NO2) profile retrievals were performed by ship-borne
Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) using a
compact/low-power spectrometer on the Japanese research vessel Kaiyo during two
ocean cruises around Japan and Japan–Bali (Indonesia)–Indian Ocean. DOAS
analysis using a 425–450 nm fitting window revealed a clear land–ocean
contrast in NO2 differential slant column densities (DSCDs) but poor
fitting results and negative values, especially at low elevation angles at
low latitudes (<~20° N). The poor fitting resulted in sparse
NO2 volume mixing ratio (VMR) data for the 0–1 km layer after applying
our vertical profile retrieval method. In contrast, NO2 VMRs retrieved
using fitting results from 460–490 nm are positive even at low latitudes,
while they are reasonably similar to those obtained from 425–450 nm at
mid-latitudes. Because NO2 DSCD for 425–450 nm shows a negative
correlation with water vapor (H2O) DSCD, the poor fitting appears to be
due primarily to interference by H2O. We analyzed a 338–370 nm fitting
window, which is free from H2O, and found good agreement between
NO2 VMRs retrieved from 460–490 nm and 338–370 nm, even at low
latitudes, at NO2 VMRs higher than ~0.2 ppbv. The results
indicate that the background value of NO2 VMR over the western Pacific
and Indian Ocean during the cruises was less than ~0.2 ppbv, with
occasional enhancement to levels of ~0.2–0.4 ppbv. |
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