Dr. Ramiro González

Computer engineer since 2012 at the University of Valladolid. In 2021 received his PhD at the University of Valladolid. He joined the Group of Atmospheric Optic from the Universidad de Valladolid (GOA-UVa) in 2009 with a PTA grant associated with technician works. He soon began securing consecutive contracts within the GOA-UVa, assuming increasing responsibilities and focusing on data-oriented tasks, which culminated in their first predoctoral contract. Following the completion of their doctoral research, they were awarded with two postdoctoral fellowships. In 2024, they achieved a position as a specialist technician in atmosphere and climate, affiliated with the Centro de Investigación de la Baja Atmósfera at the Universidad de Valladolid and associated with the GOA-UVa, where they continue to develop their professional career to this day. Since joining the group, they have consistently been involved in the research conducted by the GOA-UVa, contributing with their educational expertise to a group that initially lacked computer science specialists. Through this synergy between research and technical knowledge, they progressively developed research skills, ultimately completing their training period successfully. For their participation in the GRASP-ACE Marie Curie RISE project (in collaboration with GRASP-SAS), they hold the “Marie Curie Fellowship” distinction. Additionally, through involvement in projects funded by the Spanish Government, such as eEPOLAR and TRIPOLI, they have had the opportunity to participate in various research campaigns in both the Arctic and Antarctica.

Currently, he is responsible for the calibration infrastructure of GOA-UVa for NASA’s AERONET network, overseeing data quality and addressing the most critical technical aspects of the instrumentation that forms part of the network. To this end, he has participated in European projects such as ACTRIS (2011–2015), ACTRIS-2 (2015–2019), ACTRIS-PPP, ACTRIS-IMP, and ATMO-ACCESS. ACTRIS has been included in the ESFRI roadmap since April 2016.

Thanks to his background in computer science, he is involved in all phases of the projects that GOA-UVa carries out with ESA and EUMETSAT. These projects range from software development to data processing, analysis, and interpretation. Additionally, he contributes to the design and modeling of the tools developed for these purposes.

All this experience has led to their contribution to 37 scientific publications, which have been cited over 350 times, and to achieving an h-index of 13.

With 7 undergraduate theses supervised, 2 master’s theses, and 225 hours of teaching delivered since 2020 in the degree of Physics and the degree of Optics and Optometry, they hold 3 “trienios” and 1 “sexenio”.

Publications

151 entries « ‹ 1 of 4 › »

2025

Sara Herrero-Anta; Roberto Román; Daniel González-Fernández; Claudia Emde; David Mateos; Celia Herrero Barrio; Ramiro González; Oleg Dubovik; Carlos Toledano; Abel Calle; Victoria E. Cachorro; Bernhard Mayer; Ángel M. de Frutos

Impact of cloud presence on sky radiances and the retrieval of aerosol properties Journal Article

In: Atmospheric Research, vol. 317, pp. 107938, 2025, ISSN: 0169-8095.

Abstract | Links | BibTeX

@article{Herrero-Anta2025,

title = {Impact of cloud presence on sky radiances and the retrieval of aerosol properties},

author = {Sara Herrero-Anta and Roberto Román and Daniel González-Fernández and Claudia Emde and David Mateos and Celia Herrero Barrio and Ramiro González and Oleg Dubovik and Carlos Toledano and Abel Calle and Victoria E. Cachorro and Bernhard Mayer and Ángel M. de Frutos},

url = {https://www.sciencedirect.com/science/article/pii/S0169809525000304},

doi = {https://doi.org/10.1016/j.atmosres.2025.107938},

issn = {0169-8095},

year  = {2025},

date = {2025-01-18},

urldate = {2025-01-01},

journal = {Atmospheric Research},

volume = {317},

pages = {107938},

abstract = {This paper explores the influence of the presence of clouds on sky radiances. It also analyses their impact on the retrieval of aerosol properties when using an inversion algorithm whose radiative transfer model (RTM) is designed for cloud-free atmospheres. For that, synthetic observations are simulated for 9 partially cloudy skies and for their equivalent cloud-free skies, considering 16 different aerosol scenarios. A parameter named cloud enhancement factor (CEF) has been used to determine the modifications induced in the sky radiances by each partially cloudy scenario with respect to the cloud-free sky. This parameter indicates that the sky radiances remaining after applying a cloud-screening are affected by the presence of clouds. In general, they show enhancements between 0 and 20 % with respect to the cloud-free radiances, depending on the cloudy conditions and the scattering angle. The synthetic observations used as input for the retrieval of aerosol properties are the ones required by the inversion strategy used, GRASPpac: the aerosol optical depth (AOD) and sky radiances at 4 different wavelengths together with the ceilometer range corrected signal (RCS). In partially cloudy scenarios with low CEFs, the aerosol properties do not present significant changes with respect to the cloud-free conditions. However, for partially cloudy scenarios with higher CEFs, a clear differentiation between the aerosol optical properties retrieved with and without clouds is observed. In these scenarios, the precision of the retrieval is similar for both conditions, but the accuracy is lower for the cloudy conditions. In particular, under partially cloudy conditions, it is observed an overestimation of the real refractive index (RRI) and the single scattering albedo (SSA) between 0.05 and 0.06 and between 0.03 and 0.06 respectively, and an underestimation of the asymmetry factor (g) and the imaginary refractive index (IRI) of about ?0.02 and ? 0.005, respectively. These values slightly vary with the aerosol load and wavelength for the RRI and SSA. The effects on the size distribution parameters are very small, concluding that the impact of clouds is noticeable in the optical properties but not so much in the microphysical part.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

This paper explores the influence of the presence of clouds on sky radiances. It also analyses their impact on the retrieval of aerosol properties when using an inversion algorithm whose radiative transfer model (RTM) is designed for cloud-free atmospheres. For that, synthetic observations are simulated for 9 partially cloudy skies and for their equivalent cloud-free skies, considering 16 different aerosol scenarios. A parameter named cloud enhancement factor (CEF) has been used to determine the modifications induced in the sky radiances by each partially cloudy scenario with respect to the cloud-free sky. This parameter indicates that the sky radiances remaining after applying a cloud-screening are affected by the presence of clouds. In general, they show enhancements between 0 and 20 % with respect to the cloud-free radiances, depending on the cloudy conditions and the scattering angle. The synthetic observations used as input for the retrieval of aerosol properties are the ones required by the inversion strategy used, GRASPpac: the aerosol optical depth (AOD) and sky radiances at 4 different wavelengths together with the ceilometer range corrected signal (RCS). In partially cloudy scenarios with low CEFs, the aerosol properties do not present significant changes with respect to the cloud-free conditions. However, for partially cloudy scenarios with higher CEFs, a clear differentiation between the aerosol optical properties retrieved with and without clouds is observed. In these scenarios, the precision of the retrieval is similar for both conditions, but the accuracy is lower for the cloudy conditions. In particular, under partially cloudy conditions, it is observed an overestimation of the real refractive index (RRI) and the single scattering albedo (SSA) between 0.05 and 0.06 and between 0.03 and 0.06 respectively, and an underestimation of the asymmetry factor (g) and the imaginary refractive index (IRI) of about ?0.02 and ? 0.005, respectively. These values slightly vary with the aerosol load and wavelength for the RRI and SSA. The effects on the size distribution parameters are very small, concluding that the impact of clouds is noticeable in the optical properties but not so much in the microphysical part.

Juan Carlos Antuña-Marrero; Ángel Frutos; Rene Estevan; Victoria Cachorro; Boris Barja; Sandra Mogo; Albeht Rodríguez-Vega; Carlos Toledano; Frank García; David Mateos; Juan Carlos Antuña-Sánchez; Ramiro González; Jorge Rosas; Roberto Román; Luis Enrique Ramos-Guadalupe; Abel Calle; Iralmy Y. Platero; Carlos Hernández; Nelson Díaz; Joel Díaz

A Long and Fruitful Cooperation in Atmospheric Aerosol Research between Cuba and Spain Journal Article

In: Bulletin of the American Meteorological Society, vol. 106, no. 2, pp. E364 - E377, 2025.

Links | BibTeX

J. C. Antuña-Marrero; R. Román; V. E. Cachorro; D. Mateos; C. Toledano; A. Calle; J. C. Antuña-Sánchez; R. Gonzalez; M. Antón; J. Vaquero-Martínez; Á. M. Frutos Baraja

Comparing Integrated Water Vapor Sun Photometer Observations Over the Arctic With ERA5 and MERRA-2 Reanalyses Journal Article

In: Journal of Geophysical Research: Atmospheres, vol. 130, no. 6, pp. e2024JD041120, 2025, (e2024JD041120 2024JD041120).

Abstract | Links | BibTeX

@article{https://doi.org/10.1029/2024JD041120,

title = {Comparing Integrated Water Vapor Sun Photometer Observations Over the Arctic With ERA5 and MERRA-2 Reanalyses},

author = {J. C. Antuña-Marrero and R. Román and V. E. Cachorro and D. Mateos and C. Toledano and A. Calle and J. C. Antuña-Sánchez and R. Gonzalez and M. Antón and J. Vaquero-Martínez and Á.  M. Frutos Baraja},

url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2024JD041120},

doi = {https://doi.org/10.1029/2024JD041120},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Journal of Geophysical Research: Atmospheres},

volume = {130},

number = {6},

pages = {e2024JD041120},

abstract = {Abstract Atmospheric water vapor, a greenhouse gas, is increasing in the Arctic. It is a scientific challenge to understand the causes for this increase and determine adaptation and mitigation actions to confront its climatic effects. During the last decades, spatial and temporal coverage of water vapor satellite observations increased notably, and reanalysis water vapor estimates have steadily improved. However, the scarce spatial and temporal coverage in the Arctic of integrated water vapor (IWV) surface-based observations limits the representativeness of satellite observations and reanalysis estimate validations. Recently, we validated sun photometer IWV (IWVsp) observations with IWV from radiosondes in the Arctic. Here, we compare the hourly means of IWVsp from 13 Arctic AERONET stations and the IWV from ERA-5 and MERRA-2 reanalyses. The comparison is conducted at hourly timescale for individual stations for two Arctic regions and for the whole Arctic. The comparison showed a moist bias of IWV from reanalyses with respect to IWVsp. The individual station wise pattern shows slightly better accuracy and precision for ERA5 than for MERRA-2 also evident at the selected subregional scale. The differences of IWV from ERA5 and MERRA-2 and IWVsp show no dependence on IWVsp nor the solar zenith angle. This study corroborates that IWVsp may be used for validations of satellite IWV observations and IWV reanalyses products.},

note = {e2024JD041120 2024JD041120},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

2024

Celia Herrero del Barrio; Roberto Román; Ramiro González; Alberto Cazorla; Marcos Herreras-Giralda; Juan Carlos Antuña-Sánchez; Francisco Molero; Francisco Navas-Guzmán; Antonio Serrano; María Ángeles Obregón; Yolanda Sola; Marco Pandolfi; Sara Herrero-Anta; Daniel González-Fernández; Jorge Muñiz-Rosado; David Mateos; Abel Calle; Carlos Toledano; Victoria E. Cachorro; Ángel M. de Frutos

CAECENET: An automatic system processing photometer and ceilometer data from different networks to provide columnar and vertically-resolved aerosol properties Journal Article

In: PloS one, vol. 19, no. 12, pp. e0311990, 2024.

Links | BibTeX

S. Adriaensen; P. de Vis; J. Gatón; Á. Barreto; A. Bialek; M. Bouvet; J. Fahy; R. González; C. Toledano

Modelling the degree of linear polarization (DoLP) of the Moon’s light with a Cimel CE318-TP9 Conference

Advancement of POLarimetric Observations (APOLO) 18-21 Nov 2024. Kyoto, Japan, 2024.

Dr. Ramiro González

Publications

2025

2024

2023

2022