Diagnosing the transition layer at extratropical latitudes using MLS O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; and MOPITT CO analyses

Barré, Jérôme; Amraoui, L. El; Ricaud, Philippe; Lahoz, W. A.; Attié, Jean-Luc; Peuch, Vincent-Henri; Josse, B.; Marécal, Virginie

doi:10.5194/acp-13-7225-2013

Cited by 15 publications

(19 citation statements)

References 42 publications

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“…For ozone, the use of state augmentation, with a careful way of minimizing sampling errors, may address nonlinear effects since errors and chemical feedbacks are negatively correlated [Zoogman et al, 2014]. The use of CO and O 3 error correlations in conjunction with collocated observations can also improve both CO and O 3 spatiotemporal distribution and budgets [e.g., Barré et al, 2013]. 3.…”

Section: Discussionmentioning

confidence: 99%

Toward a chemical reanalysis in a coupled chemistry‐climate model: An evaluation of MOPITT CO assimilation and its impact on tropospheric composition

et al. 2016

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We examine in detail a 1 year global reanalysis of carbon monoxide (CO) that is based on joint assimilation of conventional meteorological observations and Measurement of Pollution in The Troposphere (MOPITT) multispectral CO retrievals in the Community Earth System Model (CESM). Our focus is to assess the impact to the chemical system when CO distribution is constrained in a coupled full chemistry‐climate model like CESM. To do this, we first evaluate the joint reanalysis (MOPITT Reanalysis) against four sets of independent observations and compare its performance against a reanalysis with no MOPITT assimilation (Control Run). We then investigate the CO burden and chemical response with the aid of tagged sectoral CO tracers. We estimate the total tropospheric CO burden in 2002 (from ensemble mean and spread) to be 371 ± 12% Tg for MOPITT Reanalysis and 291 ± 9% Tg for Control Run. Our multispecies analysis of this difference suggests that (a) direct emissions of CO and hydrocarbons are too low in the inventory used in this study and (b) chemical oxidation, transport, and deposition processes are not accurately and consistently represented in the model. Increases in CO led to net reduction of OH and subsequent longer lifetime of CH4 (Control Run: 8.7 years versus MOPITT Reanalysis: 9.3 years). Yet at the same time, this increase led to 5–10% enhancement of Northern Hemisphere O3 and overall photochemical activity via HOx recycling. Such nonlinear effects further complicate the attribution to uncertainties in direct emissions alone. This has implications to chemistry‐climate modeling and inversion studies of longer‐lived species.

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Section: Discussionmentioning

confidence: 99%

Toward a chemical reanalysis in a coupled chemistry‐climate model: An evaluation of MOPITT CO assimilation and its impact on tropospheric composition

et al. 2016

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“…This model and its assimilation system have been successfully used for tropospheric and stratospheric research (e.g. Bousserez et al, 2007;Barré et al, 2013Barré et al, , 2014Lacressonnière et al, 2014) and also for operational purposes (Rouïl et al, 2009).…”

Section: Mocage Forecast and Analysis Systemmentioning

confidence: 99%

“…The system, recently renamed VALENTINA, has been used to compute global and regional re-analyses of atmospheric composition in multiple studies (El Amraoui et al, 2008;Massart et al, 2009;Barré et al, 2013Barré et al, , 2014Emili et al, 2014). The assimilation algorithm employed for MACC-II analyses is a 3DVar with assimilation windows of 1 h length (Jaumouillé et al, 2012), corresponding to the frequency of surface measurements.…”

Section: Mocage Forecast and Analysis Systemmentioning

confidence: 99%

A regional air quality forecasting system over Europe: the MACC-II daily ensemble production

et al. 2015

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Abstract. This paper describes the pre-operational analysis and forecasting system developed during MACC (Monitoring Atmospheric Composition and Climate) and continued in the MACC-II (Monitoring Atmospheric Composition and Climate: Interim Implementation) European projects to provide air quality services for the European continent. This system is based on seven state-of-the art models developed and run in Europe (CHIMERE, EMEP, EURAD-IM, LOTOS-EUROS, MATCH, MOCAGE and SILAM). These models are used to calculate multi-model ensemble products. The paper gives an overall picture of its status at the end of MACC-II (summer 2014) and analyses the performance of the multimodel ensemble. The MACC-II system provides daily 96 h forecasts with hourly outputs of 10 chemical species/aerosols (O 3 , NO 2 , SO 2 , CO, PM 10 , PM 2.5 , NO, NH 3 , total NMVOCs (non-methane volatile organic compounds) and PAN+PAN Published by Copernicus Publications on behalf of the European Geosciences Union. V. Marécal et al.:A regional air quality forecasting system over Europe precursors) over eight vertical levels from the surface to 5 km height. The hourly analysis at the surface is done a posteriori for the past day using a selection of representative air quality data from European monitoring stations.The performance of the system is assessed daily, weekly and every 3 months (seasonally) through statistical indicators calculated using the available representative air quality data from European monitoring stations. Results for a case study show the ability of the ensemble median to forecast regional ozone pollution events. The seasonal performances of the individual models and of the multi-model ensemble have been monitored since September 2009 for ozone, NO 2 and PM 10 . The statistical indicators for ozone in summer 2014 show that the ensemble median gives on average the best performances compared to the seven models. There is very little degradation of the scores with the forecast day but there is a marked diurnal cycle, similarly to the individual models, that can be related partly to the prescribed diurnal variations of anthropogenic emissions in the models. During summer 2014, the diurnal ozone maximum is underestimated by the ensemble median by about 4 µg m −3 on average. Locally, during the studied ozone episodes, the maxima from the ensemble median are often lower than observations by 30-50 µg m −3 . Overall, ozone scores are generally good with average values for the normalised indicators of 0.14 for the modified normalised mean bias and of 0.30 for the fractional gross error. Tests have also shown that the ensemble median is robust to reduction of ensemble size by one, that is, if predictions are unavailable from one model. Scores are also discussed for PM 10 for winter 2013-1014. There is an underestimation of most models leading the ensemble median to a mean bias of −4.5 µg m −3 . The ensemble median fractional gross error is larger for PM 10 (∼ 0.52) than for ozone and the correlation is lower (∼ 0.35 for PM 10 and ∼ 0.54 for ...

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“…[], and Barré et al . [] demonstrated the ability of assimilated ozone data from limb sounders to represent individual deep stratospheric intrusion events. The work delineated above illustrates the value of a multiyear analysis and a statistical evaluation of the capabilities that assimilation of MLS data offers.…”

Section: Introductionmentioning

confidence: 99%

“…Olsen et al [2008] used the Global Modeling Initiative (GMI) model driven by GEOS-4 assimilated winds at this resolution and showed that the analysis winds have sufficient transport information in the vertical to reproduce a lamina transport event observed by HIRDLS in the lower stratosphere. Case studies done by Semane et al [2007], El Amraoui et al [2010], and Barré et al [2013] demonstrated the ability of assimilated ozone data from limb sounders to represent individual deep stratospheric intrusion events. The work delineated above illustrates the value of a multiyear analysis and a statistical evaluation of the capabilities that assimilation of MLS data offers.…”

Section: Introductionmentioning

confidence: 99%

The global structure of upper troposphere‐lower stratosphere ozone in GEOS‐5: A multiyear assimilation of EOS Aura data

et al. 2015

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Eight years of ozone measurements retrieved from the Ozone Monitoring Instrument and the Microwave Limb Sounder, both on the EOS Aura satellite, have been assimilated into the Goddard Earth Observing System Version 5 (GEOS-5) data assimilation system. This study evaluates this assimilated product, highlighting its potential for science. The impact of observations on the GEOS-5 system is explored by examining the spatial distribution of the observation-minus-forecast statistics. Independent data are used for product validation. The correlation of the lower stratospheric (the tropopause to 50 hPa) ozone column with ozonesondes is 0.99 and the (high) bias is 0.5%, indicating the success of the assimilation in reproducing the ozone variability in that layer. The upper tropospheric (500 hPa to the tropopause) assimilated ozone column is about 10% lower than the ozonesonde column, but the correlation is still high (0.87). The assimilation is shown to realistically capture the sharp cross-tropopause gradient in ozone mixing ratio. Occurrence of transport-driven low ozone laminae in the assimilation system is similar to that obtained from the High Resolution Dynamics Limb Sounder (HIRDLS) above the 400 K potential temperature surface, but the assimilation produces fewer laminae than seen by HIRDLS below that surface. Although the assimilation produces about 25% fewer occurrences per day during the 3 years of HIRDLS data, the interannual variability is captured correctly. This data-driven assimilated product is complementary to ozone fields generated from chemistry and transport models. Applications include study of the radiative forcing by ozone and tracer transport near the tropopause.

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Diagnosing the transition layer at extratropical latitudes using MLS O<sub>3</sub> and MOPITT CO analyses

Cited by 15 publications

References 42 publications

Toward a chemical reanalysis in a coupled chemistry‐climate model: An evaluation of MOPITT CO assimilation and its impact on tropospheric composition

Toward a chemical reanalysis in a coupled chemistry‐climate model: An evaluation of MOPITT CO assimilation and its impact on tropospheric composition

A regional air quality forecasting system over Europe: the MACC-II daily ensemble production

The global structure of upper troposphere‐lower stratosphere ozone in GEOS‐5: A multiyear assimilation of EOS Aura data

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