Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 6 12 2006 10.5194/acp-6-5025-2006 http://www.atmos-chem-phys.net/6/5025/2006/ http://www.atmos-chem-phys.net/6/5025/2006/acp-6-5025-2006.html http://www.atmos-chem-phys.net/6/5025/2006/acp-6-5025-2006.pdf 5025 5030 2006-10-31 Technical note: First spectral measurement of the Earth's upwelling emission using an uncooled wideband Fourier transform spectrometer L. Palchetti C. Belotti G. Bianchini F. Castagnoli B. Carli U. Cortesi M. Pellegrini C. Camy-Peyret P. Jeseck Y. Té Istituto di Fisica Applicata "Nello Carrara" - Consiglio Nazionale delle Ricerche, IFAC-CNR, Sesto Fiorentino, Firenze, I-50019, Italy Laboratoire de Physique Moléculaire pour l'Atmosphère et l'Astrophysique, LPMAA, Universite Pierre et Marie Curie – CNRS, Paris CEDEX 05, F-75252, France The first spectral measurement of Earth's emitted radiation to space in the wideband range from 100 to 1400 cm^−1 with 0.5 cm^−1 spectral resolution is presented. The measurement was performed from a stratospheric balloon in tropical region using a Fourier transform spectrometer, during a field campaign held in Brazil in June 2005. The instrument, which has uncooled components including the detector module, is a prototype developed as part of the study for the REFIR (Radiation Explorer in the Far InfraRed) space mission. This paper shows the results of the field campaign with particular attention to the measurement capabilities of the prototype. The results are compared with measurements taken by IASI-balloon (Infrared Atmospheric Sounding Interferometer – Balloon version), aboard the same platform, and with forward model estimations. The infrared signature of clouds is observed in the measurements. Anderson, G. P., Clough, S. A., Kneizys, F. X., Chetwynd, J. H., and Shettle, E. P.: AFGL atmospheric constituent profiles (0–120 km), Tech. Rep. TR-86-0110, Air Force Geophys. Lab , Bedford, Mass., 1986. Brindley, H. E., and Harries, J. E.: The impact of FAR I.R. absorption on clear sky greenhouse forcing: sensitivity studies at high spectral resolution, J. Quant. Spectrosc. Radiat. Transfer, 60, 151–180, 1998. Buehler, S. A., Eriksson, P., Kuhn, T., Von Engeln, A., and Verdes, C.: ARTS, the atmospheric radiative transfer simulator, J. Quant. Spectrosc. Radiat. Transfer, 91, 65–93, 2005. Carli, B., Barbis, A., Harries, J. E., and Palchetti, L.: Design of an efficient broad band far infrared FT spectrometer, Appl. Opt., 38, 3945–3950, 1999. Clough, S. A., Iacono, M. J., and Moncet, J. L.: Line-by-Line Calculations of Atmospheric Fluxes and Cooling Rates – Application to Water-Vapor, J. Geophys. Res. A., 97, 15 761–15 785, 1992. Clough, S. A., Iacono, M. J.: Line-by-Line Calculation of Atmospheric Fluxes and Cooling Rates. 2. Application to Carbon-Dioxide, Ozone, Methane, Nitrous-Oxide and the Halocarbons, J. Geophys. Res. A., 100, 16 519–16 535, 1995. Esposito, F., Grieco, G., Leone, L., Restieri, R., Serio, C., Bianchini, G., Palchetti, L., Pellegrini, M., Cuomo, V., Masiello, G., and Pavese, G.: REFIR/BB initial observations in the water vapour rotational band: Results from a field campaign, J. Quant. Spectrosc. Radiat. Transfer, online: http://www.sciencedirect.com/science/journal/00224073, 2006. Evans, K. F., Evans, A. H., Nolt, I. G., and Marshall, B. T.: The prospect for Remote Sensing of Cirrus Clouds with a Submillimiter-Wave Spectrometer, J. Appl. Meteor., 38, 514–525, 1999. Formisano, V., Angrilli, F., Arnold, G., et al.: The Planetary Fourier Spectrometer (PFS) onboard the European Mars Express mission, Plan. Space Sci., 53, 963–974, 2005. Goody, R., Anderson, J., and North, G.: Testing Climate Models: An Approach, Bull. Amer. Meteor. Soc., 79, 2541–2549, 1998. Lubrano A. M., Serio, C., Clough, S. A. and Kobayashi, H.: Simultaneous inversion for temperature and water vapor from IMG radiances, Geophys. Res. Lett., 27, 2533–2536, 2000. Mlynczak, M. G., Johnson, D. G., Bingham, G. E, Jucks, K. W., Traub, W. A., Gordley, L., and Harries, J. E.: The Far-Infrared Spectroscopy of the Troposphere (FIRST) Project, Geoscience and Remote Sensing Symposium, IGARSS 21–25 July 2003, Proc. IEEE International, 1, 512–514, 2003. Palchetti, L., Barbis, A., Harries, J. E., and Lastrucci, D.: Design and mathematical modelling of the space-borne far-infrared Fourier transform spectrometer for REFIR experiment, Infrared Phys. & Tech., 40, 367–377, 1999. Palchetti, L., Bianchini, G., Castagnoli, F., Carli, B., Serio, C., Esposito, F., Cuomo, V., Rizzi, R., and Maestri, T.: Breadboard of a Fourier-transform spectrometer for the Radiation Explorer in the Far Infrared atmospheric mission, Appl. Opt., 44, 2870–2878, 2005. Philipona, R., Dürr, B., Ohmura, A., and Ruckstuhl, C.: Anthropogenic greenhouse forcing and strong water vapor feedback increase temperature in Europe, Geophys. Res. Lett., 32, 2533–2536, 2005. Rizzi, R., Serio, C., and Amorati, R.: Sensitivity of broad-band and spectral measurements of outgoing radiance to changes in water vapour content, in: Optical Spectroscopic Techniques, Remote Sensing and Instrumentation for Atmospheric and Space Research IV, edited by: Larar, A. M. and Mlynczak, M. G., Proceedings of SPIE, 4485, 181–190, 2002. Rizzi, R., Palchetti, L., Carli, B., Bonsignori, R., Harries, J. E., Leotin, J., Peskett, S., Serio, C., and Sutera, A.: Feasibility study of the space-borne Radiation Explorer in the Far InfraRed (REFIR), in: Optical Spectroscopic Techniques, Remote Sensing and Instrumentation for Atmospheric and Space Research IV, edited by: Larar, A. M. and Mlynczak, M. G., Proceedings of SPIE, 4485, 202–209, 2002. Rizzi, R. and Maestri, T.: Some considerations on far infrared emission in presence of clouds, J. Geophys. Res., 108, 4403–4408, 2003. Sinha, A. and Harries, J. E.: Water vapor greenhouse trapping: The role of the far infrared absorption, Geophys. Res. Lett., 22, 2147–2150, 1995. Stocker, T. F., Clarke, G. K. C., Le Treut, H.: Physical Climate Processes and Feedbacks. Climate Change 2001: The Scientific Basis, IPCC Third Assessment Report, Chapter 7, Cambridge Univ. Press, 2001. Té, Y., Jeseck, P., Camy-Peyret, C., Payan, S., Perron, G., and Aubertin, G.: Balloonborne calibrated spectroradiometer for atmospheric nadir sounding, Appl. Opt, 41, 6431–6441, 2002. Yang, P., Mlynczak, M. G., Wei, H., Kratz, D. P., Baum, B. A., Hu, Y. X., Wiscombe, W. J., Heidinger, A., and Mishchenko, M. I.: Spectral signature of ice clouds in the far-infrared region: Single-scattering calculations and radiative sensitivity study, J. Geophys. Res., 108, 4569, doi:10.1029/2002JD003291, 2003.