References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-5245-2008

First airborne water vapor lidar measurements in the tropical upper troposphere and mid-latitudes lower stratosphere: accuracy evaluation and intercomparisons with other instruments

Kiemle

¹ Wirth

¹ Fix

¹ Ehret

¹ Schumann

¹ Gardiner

² Schiller

³ Sitnikov

⁴ Stiller

⁵

Deutsches Zentrum für Luft- und Raumfahrt, Inst. für Physik der Atmosphäre, Oberpfaffenhofen, 82234 Wessling, Germany

National Physical Laboratory, Teddington, UK

Forschungszentrum Jülich GmbH, Jülich, Germany

Central Aerological Observatory, Dolgoprudny/Moscow, Russia

Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany

04 09 2008

8 17 5245 5261

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In the tropics, deep convection is the major source of uncertainty in water vapor transport to the upper troposphere and into the stratosphere. Although accurate measurements in this region would be of first order importance to better understand the processes that govern stratospheric water vapor concentrations and trends in the context of a changing climate, they are sparse because of instrumental shortcomings and observational challenges. Therefore, the Falcon research aircraft of the Deutsches Zentrum für Luft- und Raumfahrt (DLR) flew a zenith-viewing water vapor differential absorption lidar (DIAL) during the Tropical Convection, Cirrus and Nitrogen Oxides Experiment (TROCCINOX) in 2004 and 2005 in Brazil. The measurements were performed alternatively on three water vapor absorption lines of different strength around 940 nm. These are the first aircraft DIAL measurements in the tropical upper troposphere and in the mid-latitudes lower stratosphere. Sensitivity analyses reveal an accuracy of 5% between altitudes of 8 and 16 km. This is confirmed by intercomparisons with the Fast In-situ Stratospheric Hygrometer (FISH) and the Fluorescent Advanced Stratospheric Hygrometer (FLASH) onboard the Russian M-55 Geophysica research aircraft during five coordinated flights. The average relative differences between FISH and DIAL amount to −3%±8% and between FLASH and DIAL to −8%±14%, negative meaning DIAL is more humid. The average distance between the probed air masses was 129 km. The DIAL is found to have no altitude- or latitude-dependent bias. A comparison with the balloon ascent of a laser absorption spectrometer gives an average difference of 0%±19% at a distance of 75 km. Six tropical DIAL under-flights of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on board ENVISAT reveal a mean difference of −8%±49% at an average distance of 315 km. While the comparison with MIPAS is somewhat less significant due to poorer comparison conditions, the agreement with the in-situ hygrometers provides evidence of the excellent quality of FISH, FLASH and DIAL. Most DIAL profiles exhibit a smooth exponential decrease of water vapor mixing ratio in the tropical upper troposphere to lower stratosphere transition. The hygropause with a minimum mixing ratio of 2.5 µmol/mol is found between 15 and 17 km. A high-resolution (2 km horizontal, 0.2 km vertical) DIAL cross section through the anvil outflow of tropical convection shows that the ambient humidity is increased by a factor of three across 100 km.

References 1

Ansmann, A. and Bösenberg, J.: Correction scheme for spectral broadening by Rayleigh scattering in differential absorption lidar measurements of water vapor in the troposphere, Appl. Opt., 26, 3026–3032, 1987.

Behrendt, A., Wulfmeyer, V., Di Girolamo, P., Kiemle, C., Bauer, H.-S., Schaberl, T., Summa, D., Whiteman, D. N., Demoz, B. B., Browell, E. V., Ismail, S., Ferrare, R., Kooi, S., Ehret, G., and Wang, J.: Intercomparison of Water Vapor Data Measured with Lidar during IHOP_2002, Part I: Airborne to Ground-Based Lidar Systems and Comparisons with Chilled-Mirror Hygrometer Radiosondes, J. Atmos. Ocean. Technol., 24, 3–21, 2007.

Bradshaw, N. G., Vaughan, G., Busen, R., Garcelon, S., Jones, R. L., Gardiner, T., and Hacker, J.: Tracer filamentation generated by small scale Rossby wave breaking in the lower stratosphere, J. Geophys. Res., 107(D23), 4689, doi:10.1029/2002JD002086, 2002.

Chaboureau, J. B., Cammas, J. B., Duron, J., Mascart, P. J., Sitnikov, N. M., and Voessing, H. J.: A numerical study of tropical cross-tropopause transport by convective overshoots, Atmos. Chem. Phys., 7, 1731–1740, 2007.

Corti, T., Luo, B. P., Peter, T., Vömel, H., and Fu, Q.: Mean radiative energy balance and vertical mass fluxes in the equatorial upper troposphere and lower stratosphere, Geophys. Res. Lett., 32, L06802, doi:10.1029/2004GL021889, 2005.

Draxler, R. R. and Rolph, G. D.: HYSPLIT (Hybrid Single-Particle Lagrangian Integrated Trajectory) Model access via NOAA ARL READY Website (http://www.arl.noaa.gov/ready/hysplit4.html), NOAA Air Resources Lab, Silver Spring, MD, 2003.

Ehret, G., Hoinka, K. P. , Stein, J., Fix, A., Kiemle, C., and Poberaj, G.: Low stratospheric water vapor measured by an airborne DIAL, J. Geophys. Res., 104, 31 351–31 359, 1999.

Fischer, H., Birk, M., Blom, C., Carli, B., Carlotti, M., von Clarmann, T., Delbouille, L., Dudhia, A., Ehhalt, D., Endemann, M., Flaud, J. M., Gessner, R., Kleinert, A., Koopmann, R., Langen, J., López-Puertas, M., Mosner, P., Nett, H., Oelhaf, H., Perron, G., Remedios, J., Ridolfi, M., Stiller, G., and Zander, R.: MIPAS: an instrument for atmospheric and climate research, Atmos. Chem. Phys., 8, 2151–2188, 2008.

Flentje, H. and Kiemle, C.: Erosion and mixing of filaments in the arctic lower stratosphere revealed by airborne lidar measurements, J. Geophys. Res., 108, 4232, doi:10.1029/2002JD002168, 2003.

Flentje, H., Dörnbrack, A., Fix, A., Ehret, G., and Holm, E.: Evaluation of ECMWF water vapour fields by airborne differential absorption lidar measurements: a case study between Brazil and Europe, Atmos. Chem. Phys., 7, 5033–5042, 2007.

Forster, P., Ramaswamy, V., Artaxo, P., Berntsen, T., Betts, R., Fahey, D. W., Haywood, J., Lean, J., Lowe, D. C., Myhre, G., Nganga, J., Prinn, R., Raga, G., Schulz, M., and Van Dorland, R.: Changes in Atmospheric Constituents and in Radiative Forcing, in: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K. B., Tignor, M., and Miller, H. L., Cambridge University Press, Cambridge, UK and New York, NY, USA, 2007.

Fueglistaler, S., Wernli, H., and Peter, T.: Tropical troposphere-to-stratosphere transport inferred from trajectory calculations, J. Geophys. Res., 109, D03108, doi:10.1029/2003JD004069, 2004.

Gardiner, T., Swann, N., Leggett, G., Woolley, A., Goody, B., and Woods, P.: Trace Water Vapour Measurements and Calibration, Proc. of the Water Vapour in the Upper Troposphere and Lower Stratosphere Workshop, Lancaster University, UK, July 2005.

Gettelman, A., de F. Forster, P. M., Fujiwara, M., Fu, Q., Vömel, H., Gohar, L. K., Johanson, C., and Ammerman, M.: Radiation balance of the tropical tropopause layer, J. Geophys. Res., 109, D07103, doi:10.1029/2003JD004190, 2004.

Held, I. M. and Soden, B. J.: Water vapor feedback and global warming, Annu. Rev. Energy Environ., 25, 441–475, 2000.

Kärcher, B.: Cirrus clouds in the tropical tropopause layer: Role of heterogeneous ice nuclei, Geophys. Res. Lett., 31, L12101, doi:10.1029/2004GL019774, 2004.

Keil, C., Röpnack, A., Craig, G. C., and Schumann, U.: Sensitivity of quantitative precipitation forecast to height dependent changes in humidity, Geophys. Res. Lett., 35, L09812, doi:10.1029/2008GL033657, 2008.

Kley, D., Smit, H. G. J., Vömel, H., Grassl, H., Ramanathan, V., Crutzen, P. J., Williams, S., Meywerk, J., and Oltmans, S. J.: Tropospheric water-vapour and ozone cross-sections in a zonal plane over the central equatorial Pacific Ocean, Q. J. R. Meteorol. Soc., 123, 2009–2040, 1997.

Kley, D., Russell III, J., Phillips, C. (Eds.), Gettelman, A., Harries, J., Mote, P., Oltmans, S., Remsberg, E., Rosenlof, K., and Schiller, C.: SPARC Assessment of Water Vapour in the Stratosphere and Upper Troposphere, WCRP-113, WMO/TD No. 1043, SPARC Report No. 2, 2000.

Konopka, P., Günther, G., Müller, R., dos Santos, F. H. S., Schiller, C., Ravegnani, F., Ulanovsky, A., Schlager, H., Volk, C. M., Viciani, S., Pan, L. L., McKenna, D. S., and Riese, M.: Contribution of mixing to upward transport across the tropical tropopause layer, Atmos. Chem. Phys., 7, 3285–3308, 2007.

Liu, C. and Zipser, E. J.: Global distribution of convection penetrating the tropical tropopause, J. Geophys. Res., 110, D23104, doi:10.1029/2005JD006063, 2005.

Luo, B. P., Peter, T., Wernli, H., Fueglistaler, S., Wirth, M., Kiemle, C., Flentje, H., et al.: Ultrathin Tropical Tropopause Clouds (UTTCs): II. Stabilization Mechanisms, Atmos. Chem. Phys., 3, 1093–1100, 2003.

Müller, S. C., Kämpfer, N., Feist, D. G., Haefele, A., Milz, M., Sitnikov, N., Schiller, C., Kiemle, C., and Urban, J.: Validation of stratospheric water vapour measurements from the airborne microwave radiometer AMSOS, Atmos. Chem. Phys. Discuss., 8, 1635–1671, 2008.

Peter, T., Luo, B. P., Wernli, H., Wirth, M., Kiemle, C., Flentje, H., et al.: Ultrathin Tropical Tropopause Clouds (UTTCs): I. Cloud Morphology and Occurrence, Atmos. Chem. Phys., 3, 1083–1091, 2003.

Peter, T., Marcolli, C., Spichtinger, P., Corti, T., Baker, M. B., and Koop, T.: When Dry Air Is Too Humid, Science, 314, 1399–1402, 2006.

Poberaj, G., Fix, A., Assion, A., Wirth, M., Kiemle, C., and Ehret, G.: Airborne All-Solid-State DIAL for Water Vapour Measurements in the Tropopause Region: System Description and Assessment of Accuracy, Appl. Phys. B, 75, 165–172, doi:10.1007/s00340-002-0965-x, 2002.

Pommereau, J.-P., Garnier, A., Held, G., Gomes, A.-M., Goutail, F., Durry, G., Borchi, F., Hauchecorne, A., Montoux, N., Cocquerez, P., Letrenne, G., Vial, F., Hertzog, A., Legras, B., Pisso, I., Pyle, J. A., Harris, N. R. P., Jones, R. L., Robinson, A., Hansford, G., Eden, L., Gardiner, T., Swann, N., Knudsen, B., Larsen, N., Nielsen, J., Christensen, T., Cairo, F., Pirre, M., Marecal, V., Huret, N., Riviere, E., Coe, H., Grosvenor, D., Edvarsen, K., Di Donfrancesco, G., Ricaud, P., Berthelier, J.-J., Godefroy, M., Seran, E., Longo, K., and Freitas, S.: An overview of the HIBISCUS campaign, Atmos. Chem. Phys. Discuss., 7, 2389–2475, 2007.

Rodgers, C. D. and Connor, B. J.: Intercomparison of remote sounding instruments, J. Geophys. Res., 108, D3, 4116, doi:10.1029/2002JD002299, 2003.

Rothman, L. S., Jacquemart, D., Barbe, A., Benner, D. C., Birk, M., Brown, L. R., Carleer, M. R., Chackerian, C., Chance, K., Coudert, L. H., Dana, V., Devi, V. M., Flaud, J.-M., Gamache, R. R., Goldman, A., Hartmann, J.-M., Jucks, K. W., Maki, A. G., Mandin, J.-Y., Massie, S. T., Orphal, J., Perrin, A., Rinsland, C. P., Smith, M. A. H., Tennyson, J., Tolchenov, R. N., Toth, R. A., Vander Auwera, J., Varanasi, P., and Wagner, G.: The HITRAN 2004 molecular spectroscopic database, J. Quant. Spectr. & Rad. Trans., 96, 139–204, 2005.

Schumann, U. and Huntrieser, H.: The global lightning-induced nitrogen oxides source, Atmos. Chem. Phys., 7, 3823–3907, 2007.

Sitnikov, N. M., Yushkov, V, A., Afchine, A. A., Korshunov, L. I., Astakhov, V. I., Ulanovskii, A. E., Kraemer, M., Mangold, A., Schiller, C., and Ravegnani, F.: The FLASH instrument for water vapor measurements on board the high-altitude airplane, Russian Journal on Instruments and Experimental Techniques, 50,1, 113–121, 2007.

Spang, R., Remedios, J. J., and Barkley, M. P.: Colour indices for the detection and differentiation of cloud types in infra-red limb emission spectra, Adv. Space Res., 3, 1041–1047, doi:10.1016/S0273-1177(03)00585-4, 2004.

Stenke, A. and Grewe, V.: Simulation of stratospheric water vapor trends: impact on stratospheric ozone chemistry, Atmos. Chem. Phys., 5, 1257–1272, 2005.

Thomas, A., Borrmann, S., Kiemle, C., Cairo, F., Volk, M., Beuermann, J., Lepuchov, B., Santacesaria, V., Matthey, R., Rudakov, V., Yushkov, V., MacKenzie, R., and Stefanutti, L.: In situ measurements of background aerosol and subvisible cirrus in the tropical tropopause region, J. Geophys. Res., 107, D24, 4763, doi:10.1029/2001JD001385, 2002.

Trenberth, K. E., Jones, P. D., Ambenje, P., Bojariu, R., Easterling, D., Klein Tank, A., Parker, D., Rahimzadeh, F., Renwick, J. A., Rusticucci, M., Soden, B., and Zhai, P.: Observations: Surface and Atmospheric Climate Change, in: Climate Change 2007: The Physical Science Basis, Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K. B., Tignor, M., and Miller, H. L., Cambridge University Press, Cambridge, UK and New York, NY, USA, 2007.

van Aalst, M. K., van den Broek, M. M. P., Bregman, A., Bruhl, C., Steil, B., Toon, G. C., Garcelon, S., Hansford, G. M., Jones, R. L., Gardiner, T. D., Roelofs, G. J., Lelieveld, J., and Crutzen, P. J.: Trace gas transport in the 1999/2000 Arctic winter: comparison of nudged GCM runs with observations, Atmos. Chem. Phys., 4, 81–93, 2004.

Vömel, H., Yushkov, V., Khaykin, S., Korshunov, L., Kyrö, E., and Kivi, R.: Intercomparisons of Stratospheric Water Vapor Sensors: FLASH-B and NOAA/CMDL Frost-Point Hygrometer, J. Atmos. Ocean. Technol., 24, 941–952, 2007.

Zöger, M., Afchine, A., Eicke, N., Gerhards, M.-T., Klein, E., McKenna, D. S., Mörschel, U., Schmidt, U., Tan, V., Tuitjer, F., Woyke, T., and Schiller, C.: Fast in situ stratospheric hygrometers: A new family of balloonborne and airborne Lyman-alpha photofragment fluorescence hygrometers, J. Geophys. Res., 104, 1807–1816, 1999.