 |
| Titel |
Ground-based remote sensing of HDO/H2O ratio profiles: introduction and validation of an innovative retrieval approach |
| VerfasserIn |
M. Schneider, F. Hase, T. Blumenstock |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 12 ; Nr. 6, no. 12 (2006-10-20), S.4705-4722 |
| Datensatznummer |
250004148
|
| Publikation (Nr.) |
 copernicus.org/acp-6-4705-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| We propose an innovative approach for analysing ground-based FTIR
spectra which allows us to detect variabilities of lower and
middle/upper tropospheric HDO/H2O ratios. We show
that the proposed method is superior to common approaches. We
estimate that lower tropospheric HDO/H2O ratios can
be detected with a noise to signal ratio of 15% and
middle/upper tropospheric ratios with a noise to signal ratio of
50%. The method requires the inversion to be performed on
a logarithmic scale and to introduce an inter-species constraint.
While common methods calculate the isotope ratio posterior to an
independent, optimal estimation of the HDO and H2O
profile, the proposed approach is an optimal estimator for the ratio
itself. We apply the innovative approach to spectra measured
continuously during 15 months and present, for the first time, an
annual cycle of tropospheric HDO/H2O ratio profiles
as detected by ground-based measurements. Outliers in the detected
middle/upper tropospheric ratios are interpreted by backward
trajectories. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|