Spectral aerosol optical depth from SI-traceable spectral solar irradiance measurements

Gröbner, Julian; Kouremeti, Natalia; Hülsen, Gregor; Zuber, Ralf; Ribnitzky, Mario; Nevas, Saulius; Sperfeld, Peter; Schwind, Kerstin; Schneider, Philipp; Kazadzis, Stelios; Barreto, África; Gardiner, Tom; Mottungan, Kavitha; Medland, David; Coleman, Marc

doi:10.5194/amt-16-4667-2023

Articles | Volume 16, issue 19

https://doi.org/10.5194/amt-16-4667-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-16-4667-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 19

Research article

|

12 Oct 2023

Research article |

| 12 Oct 2023

Spectral aerosol optical depth from SI-traceable spectral solar irradiance measurements

Julian Gröbner, Natalia Kouremeti, Gregor Hülsen, Ralf Zuber, Mario Ribnitzky, Saulius Nevas, Peter Sperfeld, Kerstin Schwind, Philipp Schneider, Stelios Kazadzis, África Barreto, Tom Gardiner, Kavitha Mottungan, David Medland, and Marc Coleman

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Final revised paper (published on 12 Oct 2023)
Supplement to the final revised paper
Preprint (discussion started on 16 Jun 2023)
Supplement to the preprint

Interactive discussion

Status: closed

RC1:
'Comment on amt-2023-105', Anonymous Referee #1, 01 Jul 2023

The paper by Gröbner et al concludes that the AOD can be retrieved by measurements of state-of-the-art, absolutely calibrated, sun-photometers that are traceable to SI with an accuracy that is comparable with the accuracy of the measurements of sun-photometers that have been calibrated using the Langley method. This is a very significant outcome, showing that on site calibration can result in AOD measurements within the WMO standards, which in many cases would save time and money to the operators.
The manuscript is well structured and well written. I have only a few minor comments that are listed below:
L44-45: “This … irradiances”: If possible, please provide references in order to support this statement.
L53-54: “Systematically … the results”. Please provide reference(s).
L145: “diffuser” instead of “diffusor”
L146: “six months before the campaign and has” instead of “a half year before the campaign with”
L208: Since the acronym “ToA” has been defined, please use it here, and throughout the manuscript instead of the phrase “top of the atmosphere”.

Citation: https://doi.org/10.5194/amt-2023-105-RC1
- AC1: 'Reply on RC1', Julian Gröbner, 21 Aug 2023
  
  We would like to thank the referee for his comments and supporting statements for publishing this manuscript.
  L44-45: “This … irradiances”: If possible, please provide references in order to support this statement.
  We have added the following reference, which also contains additional references supporting this statement: Toledano et al, 2018
  L53-54: “Systematically … the results”. Please provide reference(s).
  We have added 2 references: Forgan, 1994, Studer et al., 2014.
  L145: “diffuser” instead of “diffusor”
  done
  L146: “six months before the campaign and has” instead of “a half year before the campaign with”
  done
  L208: Since the acronym “ToA” has been defined, please use it here, and throughout the manuscript instead of the phrase “top of the atmosphere”.
  Done
  
  Citation: https://doi.org/10.5194/amt-2023-105-AC1
RC2:
'Comment on amt-2023-105', Odele Coddington, 10 Aug 2023

The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2023-105/amt-2023-105-RC2-supplement.pdf

Citation: https://doi.org/10.5194/amt-2023-105-RC2
- AC2: 'Reply on RC2', Julian Gröbner, 21 Aug 2023
  
  The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2023-105/amt-2023-105-AC2-supplement.pdf
  
  Citation: https://doi.org/10.5194/amt-2023-105-AC2

Peer review completion

AR – Author's response | RR – Referee report | ED – Editor decision | EF – Editorial file upload

AR by Julian Gröbner on behalf of the Authors (25 Aug 2023) Author's response Author's tracked changes Manuscript

ED: Publish as is (05 Sep 2023) by Vassilis Amiridis

AR by Julian Gröbner on behalf of the Authors (06 Sep 2023)

Short summary

Spectral solar irradiance measurements traceable to the International System of Units (SI) allow for intercomparability between instruments and for their validation according to metrological standards. Here we also validate and reduce the uncertainties of the top-of-atmosphere TSIS-1 Hybrid Solar Reference Spectrum (HSRS). The management of large networks, e.g. AERONET or GAW-PFR, will benefit from reducing logistical overhead, improving their resilience and achieving metrological traceability.