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@article{Pulimeno2026,

title = {Recent advances in aerosol optical depth measurements in polar regions: insights from the Polar-AOD Program},

author = {S. Pulimeno and A. Lupi and V. Vitale and C. Frangipani and C. Toledano and S. Kazadzis and N. Kouremeti and C. Ritter and S. Graßl and K. Stebel and V. Fioletov and I. Abboud and S. Blindheim and L. Ma and N. O'Neill and P. Sobolewski and P. Gupta and E. Lind and T. F. Eck and A. Hyvärinen and V. Aaltonen and R. Kivi and J. Csavina and D. Kabanov and S. M. Sakerin and O. R. Sidorova and R. S. Stone and H. Telg and L. Riihimaki and R. R. Cordero and M. Radenz and R. Engelmann and M. Van Roozendal and A. Chaikovsky and P. Goloub and J. Hisamitsu and M. Mazzola},

url = {https://acp.copernicus.org/articles/26/1809/2026/},

doi = {10.5194/acp-26-1809-2026},

year  = {2026},

date = {2026-02-05},

urldate = {2026-01-01},

journal = {Atmospheric Chemistry and Physics},

volume = {26},

number = {3},

pages = {1809–1846},

keywords = {Angstrom Exponent, AOD, long-term trends, lunar photometry, Polar Regions, stellar photometry},

pubstate = {published},

tppubtype = {article}

}

@article{Herrero-Anta2026,

title = {Exceptional high AOD over Svalbard in summer 2019: a multi-instrumental approach},

author = {S. Herrero-Anta and S. Eckhardt and N. Evangeliou and S. Gilardoni and S. Graßl and D. Heslin-Rees and S. Kazadzis and N. Kouremeti and R. Krejci and D. Mateos and M. Mazzola and C. Ritter and R. Román and K. Stebel and T. Zielinski},

url = {https://acp.copernicus.org/articles/26/1435/2026/},

doi = {10.5194/acp-26-1435-2026},

year  = {2026},

date = {2026-01-28},

urldate = {2026-01-01},

journal = {Atmospheric Chemistry and Physics},

volume = {26},

number = {2},

pages = {1435–1457},

keywords = {AOD, Arctic, LIDAR, multi-instrument analysis},

pubstate = {published},

tppubtype = {article}

}

@article{Román2025,

title = {Star photometry with all-sky cameras to retrieve aerosol optical depth at nighttime},

author = {R. Román and D. González-Fernández and J. C. Antuña-Sánchez and C. Herrero del Barrio and S. Herrero-Anta and Á. Barreto and V. E. Cachorro and L. Doppler and R. González and C. Ritter and D. Mateos and N. Kouremeti and G. Copes and A. Calle and M. J. Granados-Muñoz and C. Toledano and Á. M. Frutos},

url = {https://amt.copernicus.org/articles/18/2847/2025/},

doi = {10.5194/amt-18-2847-2025},

year  = {2025},

date = {2025-07-04},

urldate = {2025-07-04},

journal = {Atmospheric Measurement Techniques},

volume = {18},

number = {13},

pages = {2847–2875},

keywords = {all-sky camera, AOD, star photometry},

pubstate = {published},

tppubtype = {article}

}

@article{Herrero-Anta2023,

title = {Retrieval of aerosol properties from zenith sky radiance measurements},

author = {Sara Herrero-Anta and Roberto Román and David Mateos and Ramiro González and Juan Carlos Antuña-Sánchez and Marcos Herreras-Giralda and Antonio Fernando Almansa and Daniel González-Fernández and Celia Herrero del Barrio and Carlos Toledano and Victoria Eugenia Cachorro and Ángel Máximo de Frutos},

url = {https://amt.copernicus.org/articles/16/4423/2023/},

doi = {10.5194/amt-16-4423-2023},

year  = {2023},

date = {2023-10-09},

urldate = {2023-10-09},

journal = {Atmospheric Measurement Techniques},

volume = {16},

number = {19},

pages = {4423–4443},

abstract = {This study explores the potential to retrieve aerosol properties with the GRASP algorithm (Generalized Retrieval of Atmosphere and Surface Properties) using as input measurements of zenith sky radiance (ZSR), which are sky radiance values measured in the zenith direction, recorded at four wavelengths by a ZEN-R52 radiometer. To this end, the ZSR measured at 440, 500, 675 and 870?nm by a ZEN-R52 (ZSRZEN), installed in Valladolid (Spain), is employed. This instrument is calibrated by intercomparing the signal of each channel with coincident ZSR values simulated (ZSRSIM) at the same wavelengths with a radiative transfer model (RTM). These simulations are carried out using the GRASP forward module as RTM and the aerosol information from a co-located CE318 photometer belonging to AERONET (AErosol RObotic NETwork) as input. The dark signal and the signal dependence on temperature are characterized and included in the calibration process. The uncertainties for each channel are quantified by an intercomparison with a co-located CE318 photometer, obtaining lower values for shorter wavelengths; they are between 3?% for 440?nm and 21?% for 870?nm. The proposed inversion strategy for the aerosol retrieval using the ZSRZEN measurements as input, i.e. so-called GRASP-ZEN, assumes the aerosol as an external mixture of five pre-calculated aerosol types. A sensitivity analysis is conducted using synthetic ZSRZEN measurements, pointing out that these measurements are sensitive to aerosol load and type. It also assesses that the retrieved aerosol optical depth (AOD) values in general overestimate the reference ones by 0.03, 0.02, 0.02 and 0.01 for 440, 500, 675 and 870?nm, respectively. The calibrated ZSRZEN measurements, recorded during 2.5 years at Valladolid, are inverted by the GRASP-ZEN strategy to retrieve some aerosol properties like AOD. The retrieved AOD shows a high correlation with respect to independent values obtained from a co-located AERONET CE318 photometer, with determination coefficients (r2) of 0.86, 0.85, 0.79 and 0.72 for 440, 500, 675 and 870?nm, respectively, and finding uncertainties between 0.02 and 0.03 with respect to the AERONET values. Finally, the retrieval of other aerosol properties, like aerosol volume concentration for total, fine and coarse modes (VCT, VCF and VCC, respectively), is also explored. The comparison against independent values from AERONET presents r2 values of 0.57, 0.56 and 0.66 and uncertainties of 0.009, 0.016 and 0.02?µm3?µm?2 for VCT, VCF and VCC, respectively},

keywords = {aerosol inversion, AOD, GRASP, zenith sky radiance},

pubstate = {published},

tppubtype = {article}

}