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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-160
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 03 Jul 2018

Research article | 03 Jul 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Metrology of the Solar Spectral Irradiance at the Top Of Atmosphere in the Near Infrared Measured at Mauna Loa Observatory: The PYR-ILIOS campaign

Nuno Pereira1, David Bolsée1, Peter Sperfeld2, Sven Pape2, Dominique Sluse1, and Gaël Cessateur1 Nuno Pereira et al.
  • 1BIRA-IASB, 3 Ringlaan, 1180 Brussels, Belgium
  • 2Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

Abstract. The near infrared (NIR) part of the solar spectrum is of prime importance for the solar physics and climatology, directly intervening in the Earth's radiation budget. Despite its major role, available solar spectral irradiance (SSI) NIR datasets, space-borne or ground based, present discrepancies caused by instrumental or methodological reasons. We present new results obtained from the PYR-ILIOS campaign, which is a replication of the previous IRSPERAD campaign which took place in 2011 at the Izaña Observatory (IZO). We used the same instrument and primary calibration source of spectral irradiance. A new site was chosen for PYR-ILIOS: the Mauna-Loa observatory in Hawaii (3397masl), approximately 1000m higher than IZO. Relatively to IRSPERAD, the methodology of monitoring the traceability to the primary calibration source was improved. The results as well as a detailed error budget are presented. We demonstrate that the most recent results, from PYR-ILIOS and other space-borne and ground-based experiments show an NIR SSI lower than ATLAS3 for wavelengths above 1.6μm.

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Latest update: 17 Jul 2018
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Short summary
The knowledge of the Solar spectrum at the top of Earth's atmosphere is of great importance for Climatic studies. Instruments in satellite allow to directly measure this quantity, however, their calibration presents issues. It is possible to precisely determine this spectrum from Earth-based measurements as well, using the Langley-plot technique and accurate calibration techniques. We present an infrared spectrum using said technique on measurements made at the reference Mauna Loa Observatory.
The knowledge of the Solar spectrum at the top of Earth's atmosphere is of great importance for...
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