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| Titel |
Temporal evolution of chlorine and related species observed with ground-based FTIR at Syowa Station, Antarctica during late winter and spring in 2007 and 2011 |
| VerfasserIn |
Hideaki Nakajima, Kosuke Saeki, Isao Murata, Yoshihiro Nagahama, Masanori Takeda |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250147029
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| Publikation (Nr.) |
 EGU/EGU2017-11123.pdf |
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| Zusammenfassung |
| Vertical profiles of O3, HNO3, and HCl and vertical column of ClONO2 were retrieved from
solar spectra taken with a ground-based Fourier-Transform infrared spectrometer (FTIR)
installed at Syowa Station, Antarctica (69.0S, 39.6E) from March to December, 2007 and
September to November, 2011. We analyzed temporal variation of these species
combined with ClO data taken by Aura/MLS (Microwave Limb Sounder) satellite
sensor at 18 and 22 km over Syowa Station. In early July, polar stratospheric clouds
(PSCs) started to be formed over Syowa Station. With the return of sunlight at Syowa
Station in early July, ClONO2 and HCl showed depleted values while ClO showed
enhanced values. At two altitudes (18 and 22 km), when ClO concentrations started
to decline in early September, HCl started to increase rapidly, while the increase
in ClONO2 was gradual. The Cly partitioning between HCl, ClONO2, and ClO
showed difference at different altitudes. At the altitudes of 18 km, where ozone
was almost depleted, ClO and HNO3 amounts are low, so conversion to HCl was
favored rather than ClONO2. Whereas, at 22 km, sufficient ozone still remained, at an
amount that ClONO2 formation from ClO and NOy species continued to occur at this
altitude. |
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