Graduate in Physics at University of La Laguna in Tenerife and PhD at University of Valladolid. She has been research scientist at University of Las Palmas de Gran Canaria, Spanish National Research Council (CSIC) and University of Valladolid in the framework of several research projects on atmospheric composition (column aerosols, water vapor and ozone), spectral ultraviolet radiation, and calibration of optical radiation instruments. Currently she is working for the Group of Atmospheric Optics in the Izaña Atmospheric Research Center facilities (IARC, State Meteorological Agency of Spain – AEMET). She is in charge of the master sun-photometers belonging to AERONET-Europe infrastructure (ACTRIS-2 project) during their calibration at the IARC facility. She is carrying out calibration activities (direct sun/lunar and radiance measurements), quality control and quality assurance, troubleshooting, maintenance and repair works, training courses on photometer operation, and participation in field campaigns. At present her research focuses on the study of atmospheric aerosols by optical methods, with particular emphasis on mineral dust aerosols.
Publications
2012
C. Guirado; R. Ramos; A. de Frutos; A. Berjon; A. Redondas; C. López; V. Cachorro; E. Cuevas; R. Gonzalez; S. González; M. Hernández
Optical calibration facility at the Izaña Atmospheric Research Center Conference
Óptica Pura y Aplicada, vol. 45, no. 1, Valladolid, Spain, 2012, (37th Annual European Meeting on Atmospheric Studies by Optical Methods).
@conference{Guirado2010_02,
title = {Optical calibration facility at the Izaña Atmospheric Research Center},
author = { C. Guirado and R. Ramos and A. de Frutos and A. Berjon and A. Redondas and C. López and V. Cachorro and E. Cuevas and R. Gonzalez and S. González and M. Hernández},
editor = {Sociedad Española de Óptica},
year = {2012},
date = {2012-08-01},
booktitle = {Óptica Pura y Aplicada},
volume = {45},
number = {1},
pages = {57-62},
address = {Valladolid, Spain},
abstract = {
During the last years a new optical calibration facility have been developed and deployed at the Izaña Observatory for the calibration and characterization of radiation instrumentation within research activities. The new systems are the result of a joint effort of the Izaña Atmospheric Research Center (AEMET) and the Atmospheric Optics Group of Valladolid University (GOA-UVA). The high altitude Izaña Atmospheric Observatory is involved in several national and international atmospheric and environmental research networks and programs (i.e. GAW, BSRN, AERONET, NDACC, RBCC-E) in which is crucial a robust and traceable Quality Assurance & Quality Control system for the different broad band radiometers, photometers and spectrometers, which measure, among other ones, spectral solar radiation, aerosol optical depth and total ozone amount. This new facility allows the absolut, spectral and cosine response calibration of the above mentioned instrumentation in an isolated dark room where several set-ups are available for each kind of response characterization. At this time there are six set-ups running at the laboratory: one for the radiance calibration, one for the calculation of the angular response, one for the spectral response characterizarion, one for the slit function determination and two (vertical and horizontal oriented ones) for the irradiance calibration. The different set ups account for the different specific requirements of each sensor to be calibrated depending on its physical features as shape, size and weight. The systems have been built in a modular way, and the control and acquisition software have been developed such way the calibration facility could be easily adapted and meet the specific requirements of each program. The systems, as well as some examples of calibrations, are shown in this presentation.
},
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pubstate = {published},
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During the last years a new optical calibration facility have been developed and deployed at the Izaña Observatory for the calibration and characterization of radiation instrumentation within research activities. The new systems are the result of a joint effort of the Izaña Atmospheric Research Center (AEMET) and the Atmospheric Optics Group of Valladolid University (GOA-UVA). The high altitude Izaña Atmospheric Observatory is involved in several national and international atmospheric and environmental research networks and programs (i.e. GAW, BSRN, AERONET, NDACC, RBCC-E) in which is crucial a robust and traceable Quality Assurance & Quality Control system for the different broad band radiometers, photometers and spectrometers, which measure, among other ones, spectral solar radiation, aerosol optical depth and total ozone amount. This new facility allows the absolut, spectral and cosine response calibration of the above mentioned instrumentation in an isolated dark room where several set-ups are available for each kind of response characterization. At this time there are six set-ups running at the laboratory: one for the radiance calibration, one for the calculation of the angular response, one for the spectral response characterizarion, one for the slit function determination and two (vertical and horizontal oriented ones) for the irradiance calibration. The different set ups account for the different specific requirements of each sensor to be calibrated depending on its physical features as shape, size and weight. The systems have been built in a modular way, and the control and acquisition software have been developed such way the calibration facility could be easily adapted and meet the specific requirements of each program. The systems, as well as some examples of calibrations, are shown in this presentation.
A. Heikkilä; T. Koskela; K. Lakkala; P. Kärhä; S. Syrjälä; H. Lemmetyinen; U. Feister; N. Kouremeti; A. Bais; S. Kazadzis; J. M. Vilaplana; J. J. Rodriguez; C. Guirado; E. Cuevas
New approaches in assessment of solar UV exposure ageing materials Conference
Geophysical Research Abstracts, Vienna, Austria, 2012, (General Assembly of the European Geosciences Union (EGU)).
@conference{Heikkilä2012,
title = {New approaches in assessment of solar UV exposure ageing materials},
author = { A. Heikkilä and T. Koskela and K. Lakkala and P. Kärhä and S. Syrjälä and H. Lemmetyinen and U. Feister and N. Kouremeti and A. Bais and S. Kazadzis and J. M. Vilaplana and J. J. Rodriguez and C. Guirado and E. Cuevas},
year = {2012},
date = {2012-04-01},
booktitle = {Geophysical Research Abstracts},
address = {Vienna, Austria},
note = {General Assembly of the European Geosciences Union (EGU)},
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C. Guirado; R. Ramos; A. M. de Frutos; A. Berjon; A. Redondas; C. López; V. E. Cachorro; E. Cuevas; R. Gonzalez; S. González; M. Hernández
Optical calibration facility at the Izaña Atmospheric Research Center Journal Article
In: Óptica Pura Y Aplicada, vol. 45, pp. 57-62, 2012.
@article{Guirado2012,
title = {Optical calibration facility at the Izaña Atmospheric Research Center},
author = { C. Guirado and R. Ramos and A. M. de Frutos and A. Berjon and A. Redondas and C. López and V. E. Cachorro and E. Cuevas and R. Gonzalez and S. González and M. Hernández},
url = {http://www.sedoptica.es/Menu_Volumenes/Pdfs/OPA45-1-57.pdf},
doi = {10.7149/OPA.45.1.57},
year = {2012},
date = {2012-01-01},
journal = {Óptica Pura Y Aplicada},
volume = {45},
pages = {57-62},
abstract = {During the last years a new optical calibration facility has been developed and deployed at the Izaña Observatory for the calibration and characterization of the radiation measuring instruments within research activities. These activities require a traceable Quality Assurance & Quality Control system. This new facility allows the absolute, spectral and cosine response calibration. At present there are six set?ups running at the laboratory for radiance calibration, angular response determination, spectral response characterization, slit function determination and absolute irradiance calibration (vertical and horizontal set?ups). Each method and procedure has required the development of the corresponding protocol. These systems, as well as some examples of instrument calibrations, are presented in this work.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2011
C. Guirado; E. Cuevas; V. E. Cachorro; M. Mimouni; L. Zeudmi; C. Toledano; S. Alonso-Pérez; S. Basart; L. Blarel; P. Goloub; J. M. . Baldasano
Preliminary characterization of columnar aerosols properties (AOD-AE) at the Saharan Tamanrasset (Algeria) station Conference
Óptica Pura y Aplicada, vol. 44, no. 4, Valladolid, Spain, 2011, (37th Annual European Meeting on Atmospheric Studies by Optical Methods).
@conference{Guirado2010_01,
title = {Preliminary characterization of columnar aerosols properties (AOD-AE) at the Saharan Tamanrasset (Algeria) station},
author = { C. Guirado and E. Cuevas and V. E. Cachorro and M. Mimouni and L. Zeudmi and C. Toledano and S. Alonso-Pérez and S. Basart and L. Blarel and P. Goloub and J. M. . Baldasano},
editor = {Sociedad Española de Óptica},
year = {2011},
date = {2011-08-01},
booktitle = {Óptica Pura y Aplicada},
volume = {44},
number = {4},
pages = {635-639},
address = {Valladolid, Spain},
abstract = {At the end of September 2006 a Cimel sunphotometer was set up at Tamanrasset (Algeria) by the Izaña Atmospheric Research Center (AEMET) in collaboration with l’Office Nationale de la Météorologie (Algeria). This station was integrated in the AERONET network as a strategic site within the Global Atmospheric Watch (GAW) programme for its situation in the hearth of the Sahara, and, a priori, representative of pure desert dust, free of industrial activities. More than two years of aerosol measurements have been analyzed from October 2006 to January 2009. The mean aerosol optical depth (AOD) is 0.26±0.15 and the mean ?ngström Exponent (AE) is 0.45±0.20, evaluated from AERONET level 2 daily and monthly mean values. Both time series data show a clear seasonal cycle. A dry-cool season (fall and winter time) is characterized by low AOD and high AE values, and a wet-hot season (in spring-summer), with strong and frequent mineral dust storms, giving high AOD and low AE values, are observed at Tamanrasset. The spring-summer season is driven by a strong and thick continental boundary layer over Tamanrasset which has been analysed using the rawinsonde dataset. Both, AOD and AE values shows the behaviour of a station where desert mineral dust is the prevailing aerosol defining the characteristic of the site. However it is worthy to pointing out that a significant number of episodes with ?ngström exponent values around 1 together with AOD greater than 0.2 have been found, what suggests the presence of pollution derived aerosols. The Gobbi’s graphical-frameworks help us to discriminate this different aerosol types through the year and the HYSPLIT back trajectories are used to analyse the origin of the air masses arriving to Tamanrasset. Several problems have been found during this two year record of continuous measurements because of the difficulties regarding the instrument maintenance and the poor time-calibration process. On the one hand, the cloud screening became an extremely difficult task because the presence of heavy dust plumes, preferentially during the summertime, which were confused many times with clouds (resulting in underestimation of the AOD), and by the quasi permanent presence of cirrus clouds, associated to the subtropical jet stream, in wintertime, resulting in an overestimation of the AOD. On the other hand, around six months of data in 2008 did not achieve the level 2.0 in the AERONET database. A detailed and analysis of data shows a strong fictitious diurnal cycle within this six months dataset. The KCICLO method appears as a tool to be used to correct the calibration factor and recover this dataset.},
note = {37th Annual European Meeting on Atmospheric Studies by Optical Methods},
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pubstate = {published},
tppubtype = {conference}
}
C. Guirado; E. Cuevas; V. E. Cachorro; M. Mimouni; L. Zeudmi; C. Toledano; S. Alonso-Pérez; S. Basart; L. Blarel; P. Goloub; J. M. . Baldasano
Preliminary characterization of columnar aerosols properties (AOD-AE) at the Saharan Tamanrasset (Algeria) station Journal Article
In: Óptica Pura Y Aplicada, vol. 44, pp. 635-639, 2011.
@article{Guirado2011,
title = {Preliminary characterization of columnar aerosols properties (AOD-AE) at the Saharan Tamanrasset (Algeria) station},
author = { C. Guirado and E. Cuevas and V. E. Cachorro and M. Mimouni and L. Zeudmi and C. Toledano and S. Alonso-Pérez and S. Basart and L. Blarel and P. Goloub and J. M. . Baldasano},
year = {2011},
date = {2011-01-01},
journal = {Óptica Pura Y Aplicada},
volume = {44},
pages = {635-639},
abstract = {A Cimel sun photometer has been in operation at Tamanrasset station since late 2006. In this study, more than two years of aerosol measurements have been analyzed from October 2006 to January 2009. Two parameters, aerosol optical depth (AOD) and Ångström exponent (AE), have been used for this preliminar characterization. At this station, the mean AOD is 0.25±0.15 and the mean AE is 0.48±0.23. Both time series data show a clear seasonal cycle. A dry-cool season (fall and winter time), characterized by low AOD and high AE values, and a wet-hot season (in spring-summer), with strong and frequent mineral dust storms, giving high AOD and low AE values, are observed at Tamanrasset. Both, AOD and AE values show the behaviour of a station where desert mineral dust is the prevailing aerosol defining the characteristic of the site. However a significant number of episodes with AE values around 1 together with AOD greater than 0.2 have been found, what suggests the presence of pollution derived aerosols.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
C. Toledano; V. E. Cachorro; A. Berjón; A. M. de Frutos; D. Fuertes; R. Gonzalez; B. Torres; R. Rodrigo; Y. Bennouna; L. Martín; C. Guirado
RIMA-AERONET network: long-term monitoring of aerosol properties Journal Article
In: Óptica Pura y Aplicada, vol. 44, pp. 629-633, 2011.
@article{Toledano2011d,
title = {RIMA-AERONET network: long-term monitoring of aerosol properties},
author = { C. Toledano and V. E. Cachorro and A. Berjón and A. M. de Frutos and D. Fuertes and R. Gonzalez and B. Torres and R. Rodrigo and Y. Bennouna and L. Martín and C. Guirado},
year = {2011},
date = {2011-01-01},
journal = {Óptica Pura y Aplicada},
volume = {44},
pages = {629-633},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2009
A. Heikkilä; S. Kazadzis; O. Tolonen-Kivimäki; O. Meinander; A. Lindfors; K. Lakkala; T. Koskela; J. Kaurola; A. Sormanen; P. Kärhä; A. Naula-Iltanen; S. Syrjälä; M. Kaunismaa; J. Juhola; T. Ture; U. Feister; N. Kouremeti; A. Bais; J. M. Vilaplana; J. J. Rodriguez; C. Guirado; E. Cuevas; J. Koskinen
Effects of terrestrial UV radiation on selected outdoor materials: an interdisciplinary approach Conference
Proceedings of SPIE, vol. 7462, San Diego, United States, 2009, (SPIE Optonics & Photonics. Optical Engineering + Applications 2009).
@conference{Heikkilä2009,
title = {Effects of terrestrial UV radiation on selected outdoor materials: an interdisciplinary approach},
author = { A. Heikkilä and S. Kazadzis and O. Tolonen-Kivimäki and O. Meinander and A. Lindfors and K. Lakkala and T. Koskela and J. Kaurola and A. Sormanen and P. Kärhä and A. Naula-Iltanen and S. Syrjälä and M. Kaunismaa and J. Juhola and T. Ture and U. Feister and N. Kouremeti and A. Bais and J. M. Vilaplana and J. J. Rodriguez and C. Guirado and E. Cuevas and J. Koskinen},
year = {2009},
date = {2009-08-01},
booktitle = {Proceedings of SPIE},
volume = {7462},
address = {San Diego, United States},
note = {SPIE Optonics & Photonics. Optical Engineering + Applications 2009},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
O. E. García; A. M. Díaz; F. J. Expósito; J. P. Díaz; M. D. Gelado; C. Guirado
A methodology to evaluate the aerosol effective radius based on MODIS aerosol products applicable to other satellite platforms Journal Article
In: International Journal of Remote Sensing, vol. 30, pp. 2197-2214, 2009.
@article{Garcia2009,
title = {A methodology to evaluate the aerosol effective radius based on MODIS aerosol products applicable to other satellite platforms},
author = { O. E. García and A. M. Díaz and F. J. Expósito and J. P. Díaz and M. D. Gelado and C. Guirado},
url = {http://www.tandfonline.com/doi/abs/10.1080/01431160802549302},
doi = {10.1080/01431160802549302},
year = {2009},
date = {2009-01-01},
journal = {International Journal of Remote Sensing},
volume = {30},
pages = {2197-2214},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2008
M. Schneider; A. Redondas; F. Hase; C. Guirado; T. Blumenstock; E. Cuevas
Comparison of ground-based Brewer and FTIR total O3 monitoring techniques Journal Article
In: Atmospheric Chemistry and Physics, vol. 8, pp. 5535–5550, 2008.
@article{Schneider2008,
title = {Comparison of ground-based Brewer and FTIR total O3 monitoring techniques},
author = { M. Schneider and A. Redondas and F. Hase and C. Guirado and T. Blumenstock and E. Cuevas},
url = {https://www.atmos-chem-phys.net/8/5535/2008/},
doi = {10.5194/acp-8-5535-2008},
year = {2008},
date = {2008-01-01},
journal = {Atmospheric Chemistry and Physics},
volume = {8},
pages = {5535–5550},
keywords = {},
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2007
C. Guirado; A. Redondas; E. Cuevas; C. Torres
Actividades polares del Centro Europeo de Calibración Brewer (Regional Brewer Calibration Center- Europe) Conference
Actas del VI Simposio Argentino y III Latinoamericano sobre Investigaciones Antárticas, Buenos Aires, Argentina, 2007, (VI Simposio Argentino y III Latinoamericano sobre Investigaciones Antárticas).
@conference{Guirado2007,
title = {Actividades polares del Centro Europeo de Calibración Brewer (Regional Brewer Calibration Center- Europe)},
author = { C. Guirado and A. Redondas and E. Cuevas and C. Torres},
year = {2007},
date = {2007-09-01},
booktitle = {Actas del VI Simposio Argentino y III Latinoamericano sobre Investigaciones Antárticas},
address = {Buenos Aires, Argentina},
abstract = {The Regional Brewer Calibration Center- Europe (RBCC-E) was created in the year 2003 and located at the Izaña Atmospheric Observatory, following recommendation from the World Meteorological Organization. Polar activities carried out at this Center recently include the participation in satellite validation campaigns SAUNA I and II (Sodankylä Total Column Ozone Intercomparison). In addition a Brewer spectrophotometer belonging to the Instituto Antártico Uruguayo has been calibrated and will be installed at the King George Island in the Antarctic region. In the future it is expected that spectrophotometers belonging to other institutions will also be calibrated and installed},
note = {VI Simposio Argentino y III Latinoamericano sobre Investigaciones Antárticas},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
2006
A. Redondas; C. Guirado; E. Cuevas; C. Torres
Centro Europeo de Calibración Brewer (Regional Brewer Calibration Center-Europe): Actividades desarrolladas en regiones polares Conference
VII Simposio Español de Estudios Polares, Granada, Spain, 2006, (VII Simposio Español de Estudios Polares).
@conference{Redondas2006,
title = {Centro Europeo de Calibración Brewer (Regional Brewer Calibration Center-Europe): Actividades desarrolladas en regiones polares},
author = { A. Redondas and C. Guirado and E. Cuevas and C. Torres},
year = {2006},
date = {2006-09-01},
booktitle = {VII Simposio Español de Estudios Polares},
pages = {301-303},
address = {Granada, Spain},
note = {VII Simposio Español de Estudios Polares},
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2005
A. M. Díaz; O. E. García; J. González; C. Guirado; F. J. Expósito; J. P. Díaz; J. C. Guerra
Estructura vertical de las invasiones de polvo mineral sobre las Islas Canarias durante 2004 Conference
Teledetección. Avances en la Observación de la Tierra, Puerto de la Cruz (Tenerife), Spain, 2005, (XI Congreso Nacional de Teledetección).
@conference{Diaz2005,
title = {Estructura vertical de las invasiones de polvo mineral sobre las Islas Canarias durante 2004},
author = { A. M. Díaz and O. E. García and J. González and C. Guirado and F. J. Expósito and J. P. Díaz and J. C. Guerra},
year = {2005},
date = {2005-09-01},
booktitle = {Teledetección. Avances en la Observación de la Tierra},
pages = {375-378},
address = {Puerto de la Cruz (Tenerife), Spain},
note = {XI Congreso Nacional de Teledetección},
keywords = {},
pubstate = {published},
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O. E. García; A. M. Díaz; C. Guirado; F. J. Expósito; J. P. Díaz; J. C. Guerra
Evaluación del Índice de Aerosoles AI-TOMS a partir de parámetros de aerosoles derivados de MODIS Conference
Teledetección. Avances en la Observación de la Tierra, Puerto de la Cruz (Tenerife), Spain, 2005, (XI Congreso Nacional de Teledetección).
@conference{Garcia2005,
title = {Evaluación del Índice de Aerosoles AI-TOMS a partir de parámetros de aerosoles derivados de MODIS},
author = { O. E. García and A. M. Díaz and C. Guirado and F. J. Expósito and J. P. Díaz and J. C. Guerra},
year = {2005},
date = {2005-09-01},
booktitle = {Teledetección. Avances en la Observación de la Tierra},
pages = {367-370},
address = {Puerto de la Cruz (Tenerife), Spain},
note = {XI Congreso Nacional de Teledetección},
keywords = {},
pubstate = {published},
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C. Guirado; O. E. García; A. M. Díaz; F. J. Expósito; J. P. Díaz
Forcing in the UV region during Saharan dust events. Preliminary results Conference
Geophysical Research Abstracts, vol. 7, Vienna, Austria, 2005, (1st General Assembly of the European Geosciences Union (EGU)).
@conference{Guirado2005b,
title = {Forcing in the UV region during Saharan dust events. Preliminary results},
author = { C. Guirado and O. E. García and A. M. Díaz and F. J. Expósito and J. P. Díaz},
year = {2005},
date = {2005-04-01},
booktitle = {Geophysical Research Abstracts},
volume = {7},
address = {Vienna, Austria},
abstract = {The importance of the harmful effects of UV radiation has warranted an important effort to understand all aspects of the UV radiative transfer in the atmosphere. Special attention must be put on the study of the factors that can affect these irradiance levels. The atmospheric aerosols, i.e. solid and liquid particles in the atmosphere, can affect the climate both directly, by radiation scattering and absorption, and indirectly, modifying the cloud condensation nuclei (CCN) properties. In order to evaluate the impact of the mineral dust over the UV energy transfer (UV forcing), we have located a double monochromator in a sea level station at Santa Cruz de Tenerife, Canary Island (28.5ºN, 16.3ºW). This region is ideally suited for the study of radiative effect of the dust because it experiences frequent Saharan dust events. The instrument has been calibrated, following the standard procedure for spectral irradiance calibration, each month with DXW 100 W standard lamps and twice by year with DXW 1000 W standard lamps NIST traceable. The Slaper et al. (1995) algorithm has been used to correct for misalignments in wavelength. The aerosol properties have been obtained from the aerosol MODIS product. We have obtained variations in the integrated UV energy, from 290 to 400 nm, ranging from 30% up to 60%, depending on the aerosol load.},
note = {1st General Assembly of the European Geosciences Union (EGU)},
keywords = {},
pubstate = {published},
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}
C. Guirado
Influencia de los Aerosoles en el Balance Energético del Sistema Tierra-Atmósfera en el rango ultravioleta Masters Thesis
Universidad de La Laguna, 2005.
@mastersthesis{Guirado2005,
title = {Influencia de los Aerosoles en el Balance Energético del Sistema Tierra-Atmósfera en el rango ultravioleta},
author = { C. Guirado},
year = {2005},
date = {2005-01-01},
institution = {Universidad de La Laguna},
school = {Universidad de La Laguna},
keywords = {},
pubstate = {published},
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}