4D-Var assimilation of MIPAS chemical observations: ozone and nitrogen dioxide analyses

Errera, Quentin; Daerden, Frank; Chabrillat, Simon; Lambert, J.-C.; Lahoz, W. A.; Viscardy, S.; Bonjean, S.; Fonteyn, D.

doi:10.5194/acp-8-6169-2008

Cited by 93 publications

(114 citation statements)

References 36 publications

(43 reference statements)

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“…The daily stratospheric analyses from the three model configurations are further compared with three offline stratospheric analysis systems: BASCOE (Errera et al, 2008;Viscardy et al, 2010), SACADA TM3DAM (van der A et al, 2010). Lefever et al (2015) compared the analyses of stratospheric ozone by the o-suite (IFS-MOZART) with the results of these three offline systems and showed that its quality is primarily determined by the availability and vertical range of Aura-MLS observations.…”

Section: Stratospheric Ozonementioning

confidence: 99%

Validation of reactive gases and aerosols in the MACC global analysis and forecast system

et al. 2015

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The European MACC (Monitoring Atmospheric Composition and Climate) project is preparing the operational Copernicus Atmosphere Monitoring Service (CAMS), one of the services of the European Copernicus Programme on Earth observation and environmental services. MACC uses data assimilation to combine in situ and remote sensing observations with global and regional models of atmospheric reactive gases, aerosols, and greenhouse gases, and is based on the Integrated Forecasting System of the European Centre for Medium-Range Weather Forecasts (ECMWF). The global component of the MACC service has a dedicated validation activity to document the quality of the atmospheric composition products. In this paper we discuss the approach to validation that has been developed over the past 3 years. Topics discussed are the validation requirements, the operational aspects, the measurement data sets used, the structure of the validation reports, the models and assimilation systems validated, the procedure to introduce new upgrades, and the scoring methods. One specific target of the MACC system concerns forecasting special events with high-pollution concentrations. Such events receive extra attention in the validation process. Finally, a summary is provided of the results from the validation of the latest set of daily global analysis and forecast products from the MACC system reported in November 2014

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Section: Stratospheric Ozonementioning

confidence: 99%

Validation of reactive gases and aerosols in the MACC global analysis and forecast system

et al. 2015

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“…The climatology is based on the output of the 3-D chemical transport model BASCOE (Errera et al, 2008;Viscardy et al, 2010) which has been optimized for bromine photochemistry and budget. The total stratospheric inorganic bromine loading is of 23 pptv -including a contribution of 6 pptv by brominated very short-lived substances.…”

Section: Stratospheric Bro Correctionmentioning

confidence: 99%

Global observations of tropospheric BrO columns using GOME-2 satellite data

et al. 2011

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Abstract.Measurements from the GOME-2 satellite instrument have been analyzed for tropospheric BrO using a residual technique that combines measured BrO columns and estimates of the stratospheric BrO content from a climatological approach driven by O 3 and NO 2 observations. Comparisons between the GOME-2 results and BrO vertical columns derived from correlative ground-based and SCIAMACHY nadir observations, present a good level of consistency. We show that the adopted technique enables separation of stratospheric and tropospheric fractions of the measured total BrO columns and allows quantitative study of the BrO plumes in polar regions. While some satellite observed plumes of enhanced BrO can be explained by stratospheric descending air, we show that most BrO hotspots are of tropospheric origin, although they are often associated to regions with low tropopause heights as well. Elaborating on simulations using the p-TOMCAT tropospheric chemical transport model, this result is found to be consistent with the mechanism of bromine release through sea salt aerosols production during blowing snow events. No definitive conclusion can be drawn however on the importance of blowing snow sources in comparison to other bromine release mechanisms. Outside polar regions, evidence is provided for a global tropospheric BrO background with column of 1-3 × 10 13 molec cm −2 , consistent with previous estimates.

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“…The chemistry column model used here is an adapted version of the stratospheric photochemical scheme developed for BASCOE (Errera et al, 2008;Viscardy et al, 2010) with updated JPL06/09 chemical rates (Sander et al, 2006(Sander et al, , 2010. The scheme calculates the temporal evolution of 57 chemical species described by a system of 199 chemical reactions.…”

Section: Photochemical Modelmentioning

confidence: 99%

A simple framework for modelling the photochemical response to solar spectral irradiance variability in the stratosphere

et al. 2012

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Abstract. The stratosphere is thought to play a central role in the atmospheric response to solar irradiance variability. Recent observations suggest that the spectral solar irradiance (SSI) variability involves significant time-dependent spectral variations, with variable degrees of correlation between wavelengths, and new reconstructions are being developed. In this paper, we propose a simplified modelling framework to characterise the effect of short term SSI variability on stratospheric ozone. We focus on the pure photochemical effect, for it is the best constrained one. The photochemical effect is characterised using an ensemble simulation approach with multiple linear regression analysis. A photochemical column model is used with interactive photolysis for this purpose. Regression models and their coefficients provide a characterisation of the stratospheric ozone response to SSI variability and will allow future inter-comparisons between different SSI reconstructions. As a first step in this study, and to allow comparison with past studies, we take the representation of SSI variability from the Lean (1997) solar minimum and maximum spectra. First, solar maximum-minimum response is analysed for all chemical families and partitioning ratios, and is compared with past studies. The ozone response peaks at 0.18 ppmv (approximately 3 %) at 37 km altitude. Second, ensemble simulations are regressed following two linear models. In the simplest case, an adjusted coefficient of determinationR 2 larger than 0.97 is found throughout the stratosphere using two predictors, namely the previous day's ozone perturbation and the current day's solar irradiance perturbation. A better accuracy (R 2 larger than 0.9992) is achieved with an additional predictor, the previous day's solar irradiance perturbation. The regression models also provide simple parameterisations of the ozone perturbation due to SSI variability. Their skills as proxy models are evaluated independently against the photochemistry column model. The bias and RMS error of the best regression model are found smaller than 1 % and 15 % of the ozone response, respectively. Sensitivities to initial conditions and to magnitude of the SSI variability are also discussed.

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4D-Var assimilation of MIPAS chemical observations: ozone and nitrogen dioxide analyses

Cited by 93 publications

References 36 publications

Validation of reactive gases and aerosols in the MACC global analysis and forecast system

Validation of reactive gases and aerosols in the MACC global analysis and forecast system

Global observations of tropospheric BrO columns using GOME-2 satellite data

A simple framework for modelling the photochemical response to solar spectral irradiance variability in the stratosphere

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