Preprints
https://doi.org/10.5194/amt-2021-162
https://doi.org/10.5194/amt-2021-162

  23 Jun 2021

23 Jun 2021

Review status: this preprint is currently under review for the journal AMT.

Moderate spectral resolution solar irradiance measurements, aerosol optical depth, and solar transmission from 360 to 1070 nm using the refurbished Rotating Shadowband Spectroradiometer (RSS)

Joseph J. Michalsky1,2 and Peter W. Kiedron2 Joseph J. Michalsky and Peter W. Kiedron
  • 1NOAA Earth System Research Laboratory, Boulder, Colorado, 80305, USA
  • 2Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, 80309, USA

Abstract. This paper reports on a third generation rotating shadowband spectroradiometer (RSS) used to measure global and diffuse horizontal plus direct normal irradiances and transmissions at 1002 wavelengths between 360 and 1070 nm. The prism-dispersed spectral data are from the ARM Southern Great Plains site in north central Oklahoma (36.605 N, 97.486 W) and cover dates between August 2009 and February 2014. The refurbished RSS isolates the detector in a vacuum chamber with pressures near 10−7 torr. This prevents the deposition of outgassed vapors from the interior of the spectrometer shell on the cooled detector that affected the operation of the first commercial RSS. Methods for (1) ensuring the correct wavelength registration of the data and (2) deriving extraterrestrial responses over the entire spectrum, including throughout strong water vapor and oxygen bands, are described. The resulting data produced are archived as ARM data records and include cloud-screened aerosol optical depths as well as spectral irradiances and solar transmissions for all three solar components.

Joseph J. Michalsky and Peter W. Kiedron

Status: open (until 18 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Joseph J. Michalsky and Peter W. Kiedron

Joseph J. Michalsky and Peter W. Kiedron

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Short summary
This paper describes an instrument that measures spectrally from 360 nm (ultraviolet) to 1070 nm (near-infrared) at 1002 separate wavelengths. The measurements were made every minute from late summer of 2009 to the winter of 2014 at a site in northern Oklahoma (USA) (36.605 N, 97.486 W). Methods are described that enable the transmission across the spectrum to be measured and subsequently used to calculate aerosol optical depth and spectra irradiance.