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Mid-tropospheric Δd Observations from Iasi/Metop at High Spatial and Temporal Resolution : Volume 12, Issue 5 (25/05/2012)

By Lacour, J.-l.

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Book Id: WPLBN0003996114
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Mid-tropospheric Δd Observations from Iasi/Metop at High Spatial and Temporal Resolution : Volume 12, Issue 5 (25/05/2012)  
Author: Lacour, J.-l.
Volume: Vol. 12, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Bony, S., Risi, C., Clarisse, L., Clerbaux, C., Hurtmans, D., Coheur, P., & Lacour, J. (2012). Mid-tropospheric Δd Observations from Iasi/Metop at High Spatial and Temporal Resolution : Volume 12, Issue 5 (25/05/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Spectroscopie de l'Atmosphère, Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, Belgium. In this paper we present a method to retrieve HDO, H2O and ΔD from IASI radiances spectra. It relies on an existing radiative transfer model (Atmosphit) and optimal estimation inversion scheme, but goes further than our previous work by explicitly considering correlations between the two species. Global (fixed) HDO and H2O a priori profiles together with a covariance matrix were built from daily model simulations of HDO and H2O profiles (the LMDz-iso model is used) over the whole globe and a whole year. The retrieval parameters are described and characterized in terms of errors. We show that IASI is mostly sensitive to ΔD in the middle troposphere and allows retrieving ΔD for an integrated 3–6 km column with an error of 38‰ on an individual measurement basis. We examine the performance of the retrieval to capture the temporal (seasonal and short-term) and spatial variations of ΔD by analyzing one year of measurement at two dedicated sites (Darwin and Izaña) and a latitudinal band from −60° to 60° for a 15 days period in January. The performances are compared with LMDz-iso simulations. We report a general excellent agreement between IASI and the model and demonstrate the capabilities of IASI to reproduce the large scale variations of ΔD (seasonal cycle and latitudinal gradient) with good accuracy. In particular, we show that there is no systematic significant bias in the retrieved ΔD values in comparison with the model, and that the retrieved variability is similar to the modeled one although there are certain significant differences depending on the location. Moreover the noticeable differences between IASI and the model reported and briefly examined tend to suggest modeling issues instead of retrieval effects. Finally, we strengthen the unprecedented capabilities of IASI to capture short-term variations in ΔD, further highlighting the added value of the sounder for monitoring hydrological processes.

Summary
Mid-tropospheric δD observations from IASI/MetOp at high spatial and temporal resolution

Excerpt
Berkelhammer, M., Risi, C., Kurita, N., and Noone, D. C.: The moisture source sequence for the Madden-Julian Oscillation as derived from satellite retrievals of \chem{HDO} and H2O, J. Geophys. Res., 117, D03106, doi:10.1029/2011JD016803, 2012.; Bony, S., Colman, R., Kattsov, V., Allan, R., Bretherton, C., Dufresne, J., Hall, A., Hallegatte, S., Holland, M., Ingram, V., Randall, D., Soden, B., Tselioudis, G., and Webb, M.: How Well Do We Understand and Evaluate Climate Change Feedback Processes?, J. Climate, 19, 3445–3482, 2006.; Clerbaux, C., Boynard, A., Clarisse, L., George, M., Hadji-Lazaro, J., Herbin, H., Hurtmans, D., Pommier, M., Razavi, A., Turquety, S., Wespes, C., and Coheur, P.-F.: Monitoring of atmospheric composition using the thermal infrared IASI/MetOp sounder, Atmos. Chem. Phys., 9, 6041–6054, doi:10.5194/acp-9-6041-2009, 2009.; Craig, H.: Isotopic Variations in Meteoric Waters, Science, 133, 1702–1703, science.133.3465.1702>doi:10.1126/science.133.3465.1702, 1961.; Ehhalt, D. H.: Vertical profiles of HTO, HDO, and H2O in the Troposphere, NCAR-TN/STR-100, Natl. Cent. for Atmos. Res., Boulder, Colo., 1974.; Frankenberg, C., Yoshimura, K., Warneke, T., Aben, I., Butz, A., Deutscher, N., Griffith, D., Hase, F., Notholt, J., Schneider, M., Schrijver, H., and Rockmann, T.: Dynamic Processes Governing Lower-Tropospheric \chem{HDO}/H2O Ratios as Observed from Space and Ground, Science, 325, 1374–1377, science.1173791>doi:10.1126/science.1173791, 2009.; Frierson, D. M. W.: The Dynamics of Idealized Convection Schemes and Their Effect on the Zonally Averaged Tropical Circulation, J. Atmos. Sci., 64, 1959–1976, doi:10.1175/JAS3935.1, 2007.; Galewsky, J. and Hurley, J. V.: An advection-condensation model for subtropical water vapor isotopic ratios, J. Geophys. Res., 115, D16116, doi:10.1029/2009JD013651, 2010.; Rodgers, C. D.: Inverse methods for atmospheric sounding: theory and practise, World Scientific, 2000.; Galewsky, J., Strong, M., and Sharp, Z. D.: Measurements of water vapor D/H ratios from Mauna Kea, Hawaii, and implications for subtropical humidity dynamics, Geophys. Res. Lett., 34, L22808, doi:10.1029/2007GL031330, 2007.; Galewsky, J., Rella, C., Sharp, Z., Samuels, K., and Ward, D.: Surface measurements of upper tropospheric water vapor isotopic composition on the Chajnantor Plateau, Chile, Geophys. Res. Lett., 38, L17803, doi:10.1029/2011GL048557, 2011.; Herbin, H., Hurtmans, D., Clerbaux, C., Clarisse, L., and Coheur, P.-F.: \chem{H_2^{16}O} and HDO measurements with IASI/MetOp, Atmos. Chem. Phys., 9, 9433–9447, doi:10.5194/acp-9-9433-2009, 2009.; Hilton, F., Armante, R., August, T., Barnet, C., Bouchard, A., Camy-Peyret, C., Capelle, V., Clarisse,&


 

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