03 Aug 2023
 | 03 Aug 2023
Status: this preprint is currently under review for the journal AMT.

Evaluation of the hyperspectral radiometer (HSR1) at the ARM SGP site

Kelly A. Balmes, Laura D. Riihimaki, John Wood, Connor Flynn, Adam Theisen, Michael Ritsche, Lynn Ma, Gary B. Hodges, and Christian Herrera

Abstract. The Peak Design Ltd hyperspectral radiometer (HSR1) was tested at the Atmospheric Radiation Measurement User Facility (ARM) Southern Great Plains (SGP) site in Lamont, Oklahoma for two months from May to July 2022. The HSR1 is a prototype instrument that measures total and diffuse spectral irradiance from 360 to 1100 nm with a spectral resolution of 3 nm. The HSR1 spectral irradiance measurements are compared to nearby collocated spectral radiometers including two multifilter rotating shadowband radiometers (MFRSR) and a shortwave array spectroradiometer—hemispheric (SASHe). The total spectral irradiances at 500 nm for the HSR1 compared to the MFRSRs have a mean (relative) difference of 0.01 W m-2 nm-1 (1–2 %). The HSR1 mean diffuse spectral irradiance at 500 nm is smaller than the MFRSRs by 0.03–0.04 (10 %) W m-2 nm-1. The HSR1 clear-sky aerosol optical depth (AOD) is also retrieved by considering Langley regressions and compared to collocated instruments such as the Cimel sunphotometer (CSPHOT), MFRSRs, and SASHe. The mean HSR1 spectral AOD at 500 nm is larger than the CSPHOT by 0.010 (8 %) and larger than the MFRSRs by 0.007–0.017 (6–18 %). In general, good agreement between the HSR1 and other instruments is found in terms of the spectral total irradiance, diffuse irradiance, and AODs at 500 nm. The HSR1 quantities are also compared at other wavelengths to the collocated instruments, where similar agreement is found for the spectral irradiances, although relatively larger disagreement is found at higher wavelengths, especially for spectral AODs.

Kelly A. Balmes et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2023-115', Anonymous Referee #1, 11 Aug 2023
  • RC2: 'Comment on amt-2023-115', Anonymous Referee #2, 07 Sep 2023

Kelly A. Balmes et al.

Kelly A. Balmes et al.


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Short summary
A new hyperspectral radiometer (HSR1) was deployed and evaluated in the central United States in northern Oklahoma. The HSR1 total spectral irradiance agreed well to nearby existing instruments but the diffuse spectral irradiance was slightly smaller. The HSR1 retrieved aerosol optical depth (AOD) also agreed well with other retrieved AODs. The HSR1 performance is encouraging that new hyperspectral knowledge is possible that could inform atmospheric process understanding and weather forecasting.