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Proceedings Paper

Far-IR measurements at Cerro Toco, Chile: FIRST, REFIR, and AERI
Author(s): Richard P. Cageao; J. Ashley Alford; David G. Johnson; David P. Kratz; Martin G. Mlynczak
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Paper Abstract

In mid-2009, the Radiative Heating in the Underexplored Bands Campaign II (RHUBC-II) was conducted from Cerro Toco, Chile, a high, dry, remote mountain plateau, 23°S , 67.8°W at 5.4km, in the Atacama Desert of Northern Chile. From this site, dominant IR water vapor absorption bands and continuum, saturated when viewed from the surface at lower altitudes, or in less dry locales, were investigated in detail, elucidating infrared (IR) absorption and emission in the atmosphere. Three Fourier Transform InfraRed (FTIR) instruments were at the site, the Far-Infrared Spectroscopy of the Troposphere (FIRST), the Radiation Explorer in the Far Infrared (REFIR), and the Atmospheric Emitted Radiance Interferometer (AERI). In a side-by-side comparison, these measured atmospheric downwelling radiation, with overlapping spectral coverage from 5 to 100μm (2000 to 100cm-1), and instrument spectral resolutions from 0.5 to 0.643cm-1, unapodized. In addition to the FTIR and other ground-based IR and microwave instrumentation, pressure/temperature/relative humidity measuring sondes, for atmospheric profiles to 18km, were launched from the site several times a day. The derived water vapor profiles, determined at times matching the FTIR measurement times, were used to model atmospheric radiative transfer. Comparison of instrument data, all at the same spectral resolution, and model calculations, are presented along with a technique for determining adjustments to line-by-line calculation continuum models. This was a major objective of the campaign.

Paper Details

Date Published: 20 September 2010
PDF: 10 pages
Proc. SPIE 7808, Infrared Remote Sensing and Instrumentation XVIII, 78080T (20 September 2010); doi: 10.1117/12.862601
Show Author Affiliations
Richard P. Cageao, NASA Langley Research Ctr. (United States)
J. Ashley Alford, NASA Langley Research Ctr. (United States)
David G. Johnson, NASA Langley Research Ctr. (United States)
David P. Kratz, NASA Langley Research Ctr. (United States)
Martin G. Mlynczak, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 7808:
Infrared Remote Sensing and Instrumentation XVIII
Marija Strojnik; Gonzalo Paez, Editor(s)

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