Technical note: First spectral measurement of the Earth's upwelling emission using an uncooled wideband Fourier transform spectrometer

The first spectral measurement of Earth's emit- ted 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 bal- loon in tropical region using a Fourier transform spectrome- ter, 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 In- terferometer - Balloon version), aboard the same platform, and with forward model estimations. The infrared signature of clouds is observed in the measurements.

[1]  Shepard A. Clough,et al.  Simultaneous inversion for temperature and water vapor from IMG radiances , 2000 .

[2]  Luca Palchetti,et al.  REFIR/BB initial observations in the water vapour rotational band: Results from a field campaign , 2007 .

[3]  M. Iacono,et al.  Line-by-Line Calculations of Atmospheric Fluxes and Cooling Rates: Application to Water Vapor , 1992 .

[4]  M. Iacono,et al.  Line‐by‐line calculation of atmospheric fluxes and cooling rates: 2. Application to carbon dioxide, ozone, methane, nitrous oxide and the halocarbons , 1995 .

[5]  Luca Palchetti,et al.  Feasibility of the spaceborne radiation explorer in the far infrared (REFIR) , 2002, SPIE Optics + Photonics.

[6]  Roberta Amorati,et al.  Sensitivity of broadband and spectral measurements of outgoing radiance to changes in water vapor content , 2002, SPIE Optics + Photonics.

[7]  A. Ohmura,et al.  Anthropogenic greenhouse forcing and strong water vapor feedback increase temperature in Europe , 2005 .

[8]  Luca Palchetti,et al.  Breadboard of a Fourier-transform spectrometer for the radiation explorer in the far infrared atmospheric mission. , 2005, Applied optics.

[9]  David Crisp,et al.  The planetary fourier spectrometer (PFS) onboard the European Venus Express mission , 2005 .

[10]  Gerald R. North,et al.  Testing climate models : An approach , 1998 .

[11]  L. Palchetti,et al.  Design and mathematical modelling of the space-borne far-infrared Fourier transform spectrometer for REFIR experiment , 1999 .

[12]  B Carli,et al.  Design of an efficient broadband far-infrared Fourier-transform spectrometer. , 1999, Applied optics.

[13]  F. X. Kneizys,et al.  AFGL atmospheric constituent profiles (0-120km) , 1986 .

[14]  Stefan Buehler,et al.  ARTS, the atmospheric radiative transfer simulator , 2005 .

[15]  Gaetan Perron,et al.  Balloonborne calibrated spectroradiometer for atmospheric nadir sounding. , 2002, Applied optics.

[16]  B. Thomas Marshall,et al.  The Prospect for Remote Sensing of Cirrus Clouds with a Submillimeter-Wave Spectrometer , 1999 .

[17]  R. Rizzi,et al.  Some considerations on the infrared cloud forcing , 2003 .

[18]  John E. Harries,et al.  Water vapour and greenhouse trapping: The role of far infrared absorption , 1995 .

[19]  Bryan A. Baum,et al.  Spectral signature of ice clouds in the far-infrared region: Single-scattering calculations and radiative sensitivity study , 2003 .

[20]  G. Bingham,et al.  The Far-Infrared Spectroscopy of the Troposphere (FIRST) project , 2003, IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477).

[21]  John E. Harries,et al.  The impact of far i.r. absorption on clear sky greenhouse forcing: sensitivity studies at high spectral resolution , 1998 .