 |
| Titel |
Tropospheric column amount of ozone retrieved from SCIAMACHY limb–nadir-matching observations |
| VerfasserIn |
F. Ebojie, C. von Savigny, A. Ladstätter-Weißenmayer, A. Rozanov, M. Weber, K.-U. Eichmann, S. Bötel, N. Rahpoe, H. Bovensmann, J. P. Burrows |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 7 ; Nr. 7, no. 7 (2014-07-10), S.2073-2096 |
| Datensatznummer |
250115845
|
| Publikation (Nr.) |
 copernicus.org/amt-7-2073-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Tropospheric ozone (O3), has two main sources: transport from the
stratosphere and photochemical production in the troposphere. It plays
important roles in atmospheric chemistry and climate change. Its amount and
destruction are being modified by anthropogenic activity. Global measurements
are needed to test our understanding of its sources and sinks. In this
paper, we describe the retrieval of tropospheric O3 columns (TOCs)
from the combined limb and nadir observations (hereinafter referred to as
limb–nadir-matching (LNM)) of the SCanning Imaging Absorption spectroMeter
for Atmospheric CHartographY (SCIAMACHY) instrument, which flew as part of
the payload onboard the European Space Agency (ESA) satellite Envisat
(2002–2012). The LNM technique used in this study is a residual approach
that subtracts stratospheric O3 columns (SOCs), retrieved from the limb
observations, from the total O3 columns (TOZs), derived from the nadir
observations. The technique requires accurate knowledge of the SOCs, TOZs,
tropopause height, and their associated errors. The SOCs were determined from
the stratospheric O3 profiles retrieved in the Hartley and Chappuis bands
from SCIAMACHY limb scattering measurements. The TOZs were also derived from
SCIAMACHY measurements, but in this case from the nadir viewing mode using
the Weighting Function Differential Optical Absorption Spectroscopy (WFDOAS)
technique in the Huggins band. Comparisons of the TOCs from SCIAMACHY and
collocated measurements from ozonesondes in both hemispheres between
January 2003 and December 2011 show agreement to within 2–5 DU
(1 DU = 2.69 × 1016 molecules cm−2). TOC values
from SCIAMACHY have also been compared to the results from the Tropospheric
Emission Spectrometer (TES) and from the LNM technique exploiting Ozone
Monitoring Instrument (OMI) and Microwave Limb Sounder (MLS) data
(hereinafter referred to as OMI/MLS). All compared data sets agree
within the given data product error range and exhibit similar seasonal
variations, which, however, differ in amplitude. The spatial distributions of
tropospheric O3 in the SCIAMACHY LNM TOC product show characteristic
variations related to stratosphere–troposphere exchange (STE) processes,
anthropogenic activities and biospheric emissions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|