 |
| Titel |
Interpreting SBUV smoothing errors: an example using the quasi-biennial oscillation |
| VerfasserIn |
N. A. Kramarova, P. K. Bhartia, S. M. Frith, R. D. McPeters, R. S. Stolarski |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 8 ; Nr. 6, no. 8 (2013-08-22), S.2089-2099 |
| Datensatznummer |
250085040
|
| Publikation (Nr.) |
 copernicus.org/amt-6-2089-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Solar Backscattered Ultraviolet (SBUV) observing system consists of a
series of instruments that have been measuring both total ozone and the ozone
profile since 1970. SBUV measures the profile in the upper stratosphere with
a resolution that is adequate to resolve most of the important features of
that region. In the lower stratosphere the limited vertical resolution of the
SBUV system means that there are components of the profile variability that
SBUV cannot measure. The smoothing error, as defined in the optimal
estimation retrieval method, describes the components of the profile
variability that the SBUV observing system cannot measure. In this paper we
provide a simple visual interpretation of the SBUV smoothing error by
comparing SBUV ozone anomalies in the lower tropical stratosphere associated
with the quasi-biennial oscillation (QBO) to anomalies obtained from the Aura
Microwave Limb Sounder (MLS). We describe a methodology for estimating the
SBUV smoothing error for monthly zonal mean (mzm) profiles. We construct
covariance matrices that describe the statistics of the inter-annual ozone
variability using a 6 yr record of Aura MLS and ozonesonde data. We find that
the smoothing error is of the order of 1% between 10 and 1 hPa,
increasing up to 15–20% in the troposphere and up to 5% in the
mesosphere. The smoothing error for total ozone columns is small, mostly less
than 0.5%. We demonstrate that by merging the partial ozone columns from
several layers in the lower stratosphere/troposphere into one thick layer, we
can minimize the smoothing error. We recommend using the following layer
combinations to reduce the smoothing error to about 1%: surface to
25 hPa (16 hPa) outside (inside) of the narrow equatorial zone
20° S–20° N. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|