Articles | Volume 9, issue 9
https://doi.org/10.5194/amt-9-4355-2016
https://doi.org/10.5194/amt-9-4355-2016
Research article
 | 
06 Sep 2016
Research article |  | 06 Sep 2016

Evaluation of water vapour assimilation in the tropical upper troposphere and lower stratosphere by a chemical transport model

Swagata Payra, Philippe Ricaud, Rachid Abida, Laaziz El Amraoui, Jean-Luc Attié, Emmanuel Rivière, Fabien Carminati, and Thomas von Clarmann

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Cited articles

Abida, R., Attié, J.-L., El Amraoui, L., Ricaud, P., Lahoz, W., Eskes, H., Segers, A., Curier, L., de Haan, J., Kujanpää, J., Nijhuis, A. O., Schuettemeyer, D., Tamminen, J., Timmermans, R., Veefkind, P., and Veihelmann, B.: Impact of Spaceborne Carbon Monoxide Observations from the S-5P platform on Tropospheric Composition Analyses and Forecasts, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2015-924, in review, 2016.
Bousserez, N., Attié, J.-L., Peuch, V.-H., Michou, M., Pfister, G., Edwards, D., Emmons, L., Mari, C., Barret, B., Arnold, S. R., Heckel, A., Richter, A., Schlager, H., Lewis, A., Avery, M., Sachse, G., Browell, E. V., and Hair, J. W.: Evaluation of the MOCAGE chemistry transport model during the ICARTT/ITOP experiment, J. Geophys. Res., 112, D10S42, https://doi.org/10.1029/2006JD007595, 2007.
Brewer, A. W.: Evidence for a world circulation provided by the measurements of helium and water vapour distribution in the stratosphere, Q. J. Roy. Meteor. Soc., 75, 351–363, 1949.
Carminati, F., Ricaud, P., Pommereau, J.-P., Rivière, E., Khaykin, S., Attié, J.-L., and Warner, J.: Impact of tropical land convection on the water vapour budget in the tropical tropopause layer, Atmos. Chem. Phys., 14, 6195–6211, https://doi.org/10.5194/acp-14-6195-2014, 2014.
Carminati, F., Ricaud, P., Pommereau, J.-P., D. Rivière, E., Attié, J.-L., Payra, S., El Amraoui, L., and Abida, R.: Role of saturation in the water vapor diurnal cycle in the South American Tropical Tropopause Layer, Geophys. Res. Lett., in preparation, 2016.
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Short summary
The study deals with the budget of water vapour (H2O) at the tropical tropopause. The MOCAGE-VALENTINA assimilation tool has been used to assimilate Microwave Limb Sounder H2O space-borne measurements within the 316–5 hPa range from August 2011 to March 2013. Diagnostics are developed to assess the quality of the analyses depending on several parameters. Sensitivity studies show the improvement on the analyses when assimilating measurements of better quality, mainly over the convective areas.