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| Titel |
Enhanced NO2 in Okinawa Island, Japan by rapid airmass transport from mainland China as observed by MAX-DOAS |
| VerfasserIn |
H. Takashima, H. Irie, Y. Kanaya, H. Akimoto |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022104
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| Zusammenfassung |
| Continuous NO2 profile observation using ground-based Multi Axis Differential Optical
Absorption Spectroscopy (MAX-DOAS) at Cape Hedo (26.87-N, 128.25-E) in Okinawa
Island, Japan has been conducted since March 2007. MAX-DOAS NO2 observation covering
a period more than one year shows low concentration particularly during northern summer
with less than 0.3 ppbv at 0-1 km for most cases, whereas higher concentration (more than 1
ppbv) was sometimes observed during winter-spring. The higher concentration with
high variability during winter-spring is also found by Global Ozone Monitoring
Experiment (GOME2) and Ozone Monitoring Instrument (OMI) satellite observations for
tropospheric column NO2 under less cloud condition. Trajectory analysis using the
meteorological analysis data set from Japan Meteorological Agency shows that the high NO2
concentration is mainly caused by rapid airmass transport from mainland China
within ~24 hours in accordance with strong westerly wind. Such rapid airmass
transport is one of the most important components for NO2 variations at Cape Hedo,
even though the Hedo area is located about 700 km away from the coast of China. |
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