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| Titel |
Increasing synoptic scale variability in atmospheric CO2 at Hateruma Island associated with increasing East-Asian emissions |
| VerfasserIn |
Y. Tohjima, H. Mukai, S. Hashimoto, P. K. Patra |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 2 ; Nr. 10, no. 2 (2010-01-19), S.453-462 |
| Datensatznummer |
250007955
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| Publikation (Nr.) |
 copernicus.org/acp-10-453-2010.pdf |
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| Zusammenfassung |
| In-situ observations of atmospheric CO2 and CH4 at
Hateruma Island (24.05° N, 123.80° E, 47 m a.s.l),
Japan shows large synoptic scale variations during a 6-month period
from November to April, when the sampled air is predominantly of
continental origin due to the Asian winter monsoon. Synoptic scale
variations are extracted from the daily averaged values for the
years between 1996 and 2007, along with the annual standard
deviations (σCO2 and σCH4 for
CO2 and CH4, respectively) for the relevant 6-month
period. During this 6-month period the absolute mixing ratios of
CO2 and CH4 at Hateruma are also elevated compared to
those at two sites in the central North Pacific Ocean. The temporal
change in σCO2 shows a systematic increase over the
12-year period, with elevated excursions in 1998 and 2003; there is
no clear increase in σCH4. We also find that the
σCO2/σCH4 ratio increases gradually
from 1996 to 2002 and rapidly after 2002 without any extreme
deviations that characterised σCO2. The σCO2/σCH4 ratio correlates closely with the recent
rapid increase in fossil carbon emissions from China, as indicated
in the Carbon Dioxide Information Analysis Center (CDIAC) database.
This methodology can be applied to multiple chemical tracers of
sufficient lifetime, for tracking overall changes in regional
emissions. |
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