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The Asset Intercomparison of Stratosphere and Lower Mesosphere Humidity Analyses : Volume 9, Issue 3 (09/02/2009)

By Thornton, H. E.

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Book Id: WPLBN0003995278
Format Type: PDF Article :
File Size: Pages 22
Reproduction Date: 2015

Title: The Asset Intercomparison of Stratosphere and Lower Mesosphere Humidity Analyses : Volume 9, Issue 3 (09/02/2009)  
Author: Thornton, H. E.
Volume: Vol. 9, Issue 3
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Jackson, D. R., Lahoz, W. A., Bormann, N., Geer, A. J., Errera, Q., Thornton, H. E.,...Rharmili, S. (2009). The Asset Intercomparison of Stratosphere and Lower Mesosphere Humidity Analyses : Volume 9, Issue 3 (09/02/2009). Retrieved from http://www.ebooklibrary.org/


Description
Description: Met Office, UK. This paper presents results from the first detailed intercomparison of stratosphere-lower mesosphere water vapour analyses; it builds on earlier results from the EU funded framework V Assimilation of ENVISAT Data (ASSET) project. Stratospheric water vapour plays an important role in many key atmospheric processes and therefore an improved understanding of its daily variability is desirable. With the availability of high resolution, good quality Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) water vapour profiles, the ability of four different atmospheric models to assimilate these data is tested. MIPAS data have been assimilated over September 2003 into the models of the European Centre for Medium Range Weather Forecasts (ECMWF), the Belgian Institute for Space and Aeronomy (BIRA-IASB), the French Service d'Aéronomie (SA-IPSL) and the UK Met Office. The resultant middle atmosphere humidity analyses are compared against independent satellite data from the Halogen Occultation Experiment (HALOE), the Polar Ozone and Aerosol Measurement (POAM III) and the Stratospheric Aerosol and Gas Experiment (SAGE II). The MIPAS water vapour profiles are generally well assimilated in the ECMWF, BIRA-IASB and SA systems, producing stratosphere-mesosphere water vapour fields where the main features compare favourably with the independent observations. However, the models are less capable of assimilating the MIPAS data where water vapour values are locally extreme or in regions of strong humidity gradients, such as the southern hemisphere lower stratosphere polar vortex. Differences in the analyses can be attributed to the choice of humidity control variable, how the background error covariance matrix is generated, the model resolution and its complexity, the degree of quality control of the observations and the use of observations near the model boundaries. Due to the poor performance of the Met Office analyses the results are not included in the intercomparison, but are discussed separately. The Met Office results highlight the pitfalls in humidity assimilation, and provide lessons that should be learnt by developers of stratospheric humidity assimilation systems. In particular, they underline the importance of the background error covariances in generating a realistic troposphere to mesosphere water vapour analysis.

Summary
The ASSET intercomparison of stratosphere and lower mesosphere humidity analyses

Excerpt
Andersson, E. and Järvinen, H.: Variational quality control, Q. J. Roy. Meteor. Soc., 125, 697–722, 1999.; Bormann, N., Healy, S. B., and Hamrud, M.: Assimilation of MIPAS limb radiances in the ECMWF system. II: Experiments with a 2-dimensional observation operator and comparison to retrieval assimilation, Q. J. Roy. Meteor. Soc., 133, 329–346, doi:10.1002/qj.47, 2007.; Cohn, S. E.: Assessing the effects of data selection with the DAO physical-space statistical analysis system, Mon. Weather Rev., 126(2913), 2013–2926, 1998.; 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, doi:10.1002/qj.49707532603, 1949.; Daerden, F., Larsen, N., Chabrillat, S., Errera, Q., Bonjean, S., Fonteyn, D., Hoppel, K., and Fromm, M.: A 3D-CTM with detailed online PSC-microphysics: analysis of the Antarctic winter 2003 by comparison with satellite observations, Atmos. Chem. Phys., 7, 1755–1772, 2007.; Hólm, E., Andersson, E., Beljaars, A., and et al.: Assimilation and Modelling of the Hydrological Cycle: ECMWF\u2019s Status and Plans, Tech. Memo., 383, ECMWF, 2002.; Davies, T., M. J. P. Cullen, Malcolm, A. J., Mawson, M H., Staniforth, A., White, A. A., and Wood, N.: A new dynamical core for the Met Office's global and regional modelling of the atmosphere, Q. J. Roy. Meteor. Soc., 131, 1759–1782, 2005.; Errera, Q., Daerden, F., Chabrillat, S., Lambert, J C., Lahoz, W A., Viscardy, S., Bonjean, S., and Fonteyn, D.: 4D-Var assimilation of MIPAS chemical observations: ozone and nitrogen dioxide analyses, Atmos. Chem. Phys., 8, 6169–6187, 2008.; Dee, D. and da Silva, A.: The Choice of Variable for Atmospheric Moisture Analysis, Mon. Weather Rev., 131, 155–171, 2003.; El Amraoui, L., Ricaud, P., Urban, J., Théodore, B., Hauchecorne, A., Lautié, N., De La Noë, J., Guirlet, M., Flochmoën, E L., Murtagh, D., Dupuy, E., Frisk, U., and Fanton d'Andon, O.: Assimilation of Odin/SMR $O_3$ and \chemN_2O measurements in a three-dimensional chemistry transport model, J. Geophys. Res., 109, D22304, doi:10.1029/2004JD004796, 2004.; Fierli, F., Hauchecorne, A., Bekki, S., Théodore, B., and Fanton d'Andon, O.: Data assimilation of stratospheric ozone using a high-resolution transport model, Geophys. Res. Lett., 29, 1381, doi:10.1029/2001GL014272, 2002.; Fischer, H. and Oelhaf, H.: Remote sensing of vertical profiles of atmospheric trace constituents with MIPAS limb-emission spectrometers, Appl. Optics, 35, 2787–2796, 1996.; Fisher, M.: Background error covariance modelling, in: Seminar on Recent developments in data assimilation for atmosphere and ocean, 8–12 September 2003, edited by ECMWF, Shinfield Park, Reading, 45–64, 2003.; Geer, A. J., Lahoz, W. A., Bekki, S., Bormann, N., Errera, Q., Eskes, H. J., Fonteyn, D., Jackson, D. R., Juckes, M. N., Massart, S., Peuch, V.-H., Rharmili, S., and Segers, A.: The ASSET intercomparison of ozone analyses: method and first results, Atmos. Chem. Phys., 6, 5445–5474, 2006.; Healy, S. B. and Thépaut, J. N.: Assimilation experiments with CHAMP GPS radio occultation measurements, Q. J. Roy. Meteor. Soc., 132, 605–623, 2006.; Harries, J. E., Russell III, J. M., Tuck, A. F., Gordley, L. L., Purcell, P., Stone, K., Bevilacqua, R. M., Gunson, M., Nedoluha, G., and Traub, W. A.: Validation of measurements of water vapor from the Halogen Occultation Experiment (HALOE), J. Geophys. Res, 101, 10 205–10 216, 1996.; Jackson, D. R., Burrage, M. D., Harries, J. E., Gray, L. J., Russell, J. M.: The semi-annual oscillation in upper stratospheric and mesospheric water vapour as observed by HALOE, Q. J. Roy. Meteor. Soc., 124, 2493–2515, 1998.; Jackson, D. R., Keil, M., and Devenish, B. J.: Use of Canadian Quick Covariances in the Met Office data assimilation system, Q. J. Roy. Meteorol. Soc., 134, 1567–1582, 2008.; Juckes, M. N.: An annual cycle of long lived stratospheric gases from MIPAS, Atm. Chem. Phys., 7, 1879–1897

 

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