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Submillimeter Fourier-transform spectrometer measurements of atmospheric opacity above Mauna Kea

1998; Optica Publishing Group; Volume: 37; Issue: 12 Linguagem: Inglês

10.1364/ao.37.002185

0003-6935

Eugene Serabyn, Eric W. Weisstein, D. C. Lis, J. R. Pardo,

Atmospheric Ozone and Climate

We present accurately calibrated submillimeter atmospheric transmission spectra obtained with a Fourier-transform spectrometer at the Caltech Submillimeter Observatory on Mauna Kea, Hawaii. These measurements cover the 0.9-0.3-mm wavelength range and are the first in a series aimed at defining the terrestrial long-wave atmospheric transmission curve. The 4.1-km altitude of the Mauna Kea site provides access to extremely low zenith water-vapor columns, permitting atmospheric observations at frequencies well above those possible from sea level. We describe the calibration procedures, present our first well-calibrated transmission spectra, and compare our results with those of a single-layer atmospheric transmission model, AT. With an empirical best-fit continuum opacity term included, this simple single-layer model provides a remarkably good fit to the opacity data for H(2)O line profiles described by either van Vleck-Weisskopf or kinetic shapes.