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A stratospheric NO2 climatology from Odin/OSIRIS limb-scatter measurements

Samuel Brohede (Institutionen för radio- och rymdvetenskap, Global miljömätteknik) ; C. A. McLinden ; G. Berthet ; C. S. Haley ; Donal P. Murtagh (Institutionen för radio- och rymdvetenskap, Global miljömätteknik) ; C. E. Sioris
Canadian Journal of Physics (1208-6045). Vol. 85 (2007), 11, p. 1253-1274.
[Artikel, refereegranskad vetenskaplig]

A climatology of stratospheric nitrogen dioxide (NO2), in terms of mean and standard deviation, as a function of latitude (5° bins); altitude (10–46 km in 2 km bins); local solar time (24 h); and month is constructed based on the Odin/OSIRIS limb-scattering data from 2002–2005. The measured profiles, given at specific local solar times, are scaled to all 24 h using a photochemical box model. The Odin orbit gives near global coverage around the equinoxes and hemispheric coverage elsewhere, due to lack of sunlight. The mean NO2 field at a specific local solar time involves high concentrations in the polar summer, peaking at around 25 km, with a negative equatorward gradient. Distinct high levels between 40–50° latitude at 30 km in the winter/spring hemisphere are also found, associated with the so-called {Noxon-cliff}. The diurnal cycle reveals the lowest NO2 concentrations just after sunrise and steep gradients at twilight. The 1σ standard deviation is generally quite low, around 20%, except for winter and spring high latitudes, where values are well above 50% and stretch through the entire stratosphere, a phenomenon probably related to the polar vortex. It is also found that NO2 concentrations are log-normally distributed. Comparisons to a climatology based on data from a (REPROBUS) chemical transport model for the same time period reveal relative differences below 20% in general, which is comparable to the estimated OSIRIS systematic uncertainty. Clear exceptions are the polar regions in winter/spring throughout the atmosphere and equatorial regions below 25 km, where OSIRIS is relatively higher by 40% and more. These discrepancies are most likely attributable to limitations of the model, but this has to be investigated further.

Nyckelord: Satellite Odin OSIRIS Climatology Limb scattering Stratosphere nitrogen dioxide



Denna post skapades 2007-11-07. Senast ändrad 2014-09-02.
CPL Pubid: 61422

 

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Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Global miljömätteknik (2005-2008)

Ämnesområden

Molekylfysik
Optik
Rymdfysik
Spektroskopi
Meteorologi och atmosfärforskning

Chalmers infrastruktur

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Satellite Limb-Scatter Observations of Stratospheric NO2 and O3 -Retrievals, Validation and Applications