 |
| Titel |
Sensitivity of Dobson and Brewer Umkehr ozone profile retrievals to ozone cross-sections and stray light effects |
| VerfasserIn |
I. Petropavlovskikh, R. Evans, G. McConville, S. Oltmans, D. Quincy, K. Lantz, P. Disterhoft, M. Stanek, L. Flynn |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 9 ; Nr. 4, no. 9 (2011-09-09), S.1841-1853 |
| Datensatznummer |
250002093
|
| Publikation (Nr.) |
 copernicus.org/amt-4-1841-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| Remote sounding methods are used to derive ozone profile and column
information from various ground-based and satellite measurements. Vertical
ozone profiles measured in Dobson units (DU) are currently retrieved based
on laboratory measurements of the ozone absorption cross-section spectrum
between 270 and 400 nm published in 1985 by Bass and Paur (BP). Recently,
the US National Aeronautics and Space Administration (NASA) and the European
Space Agency (ESA) proposed using the set of ozone cross-section
measurements made at the Daumont laboratory in 1992 (BDM) for revising the
Aura Ozone Monitoring Instrument (OMI) and Global Ozone Monitoring
Experiment (GOME) satellite ozone profiles and total ozone column
retrievals. Dobson Umkehr zenith sky data have been collected by NOAA
ground-based stations at Boulder, CO (BDR) and Mauna Loa Observatory, HI
(MLO) since the 1980s. The UMK04 algorithm is based on the BP ozone
cross-section data. It is currently used for all Dobson Umkehr data
processing submitted to the World Ozone and Ultraviolet radiation Data
Centre (WOUDC) under the Global Atmosphere Watch (GAW) program of the World
Meteorological Organization (WMO). Ozone profiles are also retrieved from
measurements by the Mark IV Brewers operated by the NOAA-EPA Brewer
Spectrophotometer UV and Ozone Network (NEUBrew) using a modified UMK04
algorithm (O3BUmkehr v.2.6, Martin Stanek). This paper describes the
sensitivity of the Umkehr retrievals with respect to the proposed ozone
cross-section changes. It is found that the ozone cross-section choice only
minimally (within the retrieval accuracy) affects the Dobson and the Brewer
Umkehr retrievals. On the other hand, significantly larger errors were found
in the MLO and Boulder Umkehr ozone data (−8 and +5% bias in
stratosphere and troposphere respectively) when the out-of-band (OOB) stray
light contribution to the Umkehr measurement is not taken into account
(correction is currently not included in the UMK04). The vertical
distribution of OOB effect in the retrieved profile can be related to the
local ozone climatology, instrument degradation, and optical characteristics
of the instrument. Nonetheless, recurring OOB errors do not contribute to
the long-term ozone trends. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|