Karlsruhe optimized and precise radiative transfer algorithm: II. Interface to retrieval applications

Hoepfner, Michael; Stiller, G. P.; Kuntz, M.; Clarmann, T. von; Echle, Georg; Funke, B.; Glatthor, N.; Hase, Frank; Kemnitzer, Holger; Zorn, Sabine

doi:10.1117/12.317753

Cited by 34 publications

(20 citation statements)

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“…The FTIR retrieval (PROFFIT, Hase et al, 2004) applies a precise radiative transfer model (KOPRA, Höpfner et al, 1998;Kuntz et al, 1998;Stiller et al, 1998). KOPRA is a line-by-line model which simulates the measured spectra.…”

Section: Principles Of the Ftir Retrievalmentioning

confidence: 99%

Comparison of ground-based Brewer and FTIR total column O3 monitoring techniques

et al. 2008

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Abstract.We compare the currently most precise, groundbased total O 3 measurement techniques: Brewer and FTIR. We give an overview of the similarities and the differences between the measurements and the retrieval approaches of both experiments. We compare coincident measurements performed at the Atmospheric Observatory of Izaña from 2005 to 2007 and demonstrate that, if the properties of the instruments are well characterised, the scatter between both experiments is as small as 0.5%. This is in agreement with the theoretical predictions and confirms empirically that both techniques are able to monitor total O 3 amounts with a precision of better than 0.4%. However, we found systematic differences between both techniques of around 4.5%, which we think are mainly due to discrepancies between the applied UV and infrared spectroscopic parameters.

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Section: Principles Of the Ftir Retrievalmentioning

confidence: 99%

Comparison of ground-based Brewer and FTIR total column O3 monitoring techniques

et al. 2008

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“…It applies the Karlsruhe Optimised and Precise Radiative Transfer Algorithm (KOPRA, Höpfner et al, 1998;Kuntz et al, 1998; as the forward model, which was developed for the analysis of MIPAS-Envisat limb sounder spectra. PROFFIT enables the inversion on a linear and logarithmic scale.…”

Section: General Retrieval Aspectsmentioning

confidence: 99%

Ground-based remote sensing of HDO/H2O ratio profiles: introduction and validation of an innovative retrieval approach

2006

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Abstract.We propose an innovative approach for analysing ground-based FTIR spectra which allows us to detect variabilities of lower and middle/upper tropospheric HDO/H 2 O ratios. We show that the proposed method is superior to common approaches. We estimate that lower tropospheric HDO/H 2 O 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 H 2 O 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/H 2 O ratio profiles as detected by groundbased measurements. Outliers in the detected middle/upper tropospheric ratios are interpreted by backward trajectories.

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“…These measurements consist in independent detec- for the a-priori knowledge: S a is the a-priori covariance matrix and x a represents the a-priori state. We apply the inversion code PROFFIT which uses the Karlsruhe Optimised and Precise Radiative Transfer Algorithm (KOPRA, Höpfner et al, 1998;Kuntz et al, 1998; as forward model.…”

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Technical Note: Recipe for monitoring of total ozone with a precision of around 1 DU applying mid-infrared solar absorption spectra

Schneider

Hase

2008

Atmos. Chem. Phys.

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Abstract. Mid-infrared solar absorption spectra recorded by a state-of-the-art ground-based FTIR system have the potential to provide precise total O 3 amounts. The currently bestperforming retrieval approaches use a combination of small and broad spectral O 3 windows between 780 and 1015 cm −1 . We show that for these approaches the uncertainties of the temperature profile are by far the major error sources. We demonstrate that a joint optimal estimation of temperature and O 3 profiles widely eliminates this error. The improvements are documented by an extensive theoretical error estimation. Our results suggest that mid-infrared FTIR measurements can provide total O 3 amounts with a precision of around 1 DU, placing this method among the most precise ground-based O 3 monitoring techniques. We recapitulate the requirements on the instrumental hardware and on the retrieval that are needed to achieve this high precision.

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Karlsruhe optimized and precise radiative transfer algorithm: II. Interface to retrieval applications

Cited by 34 publications

References 0 publications

Comparison of ground-based Brewer and FTIR total column O<sub>3</sub> monitoring techniques

Comparison of ground-based Brewer and FTIR total column O<sub>3</sub> monitoring techniques

Ground-based remote sensing of HDO/H<sub>2</sub>O ratio profiles: introduction and validation of an innovative retrieval approach

Technical Note: Recipe for monitoring of total ozone with a precision of around 1 DU applying mid-infrared solar absorption spectra

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Karlsruhe optimized and precise radiative transfer algorithm: II. Interface to retrieval applications

Cited by 34 publications

References 0 publications

Comparison of ground-based Brewer and FTIR total column O&lt;sub&gt;3&lt;/sub&gt; monitoring techniques

Comparison of ground-based Brewer and FTIR total column O&lt;sub&gt;3&lt;/sub&gt; monitoring techniques

Ground-based remote sensing of HDO/H&lt;sub&gt;2&lt;/sub&gt;O ratio profiles: introduction and validation of an innovative retrieval approach

Technical Note: Recipe for monitoring of total ozone with a precision of around 1 DU applying mid-infrared solar absorption spectra

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Comparison of ground-based Brewer and FTIR total column O<sub>3</sub> monitoring techniques

Comparison of ground-based Brewer and FTIR total column O<sub>3</sub> monitoring techniques

Ground-based remote sensing of HDO/H<sub>2</sub>O ratio profiles: introduction and validation of an innovative retrieval approach