Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-303
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model evaluation paper
16 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
Comparison of observed and modelled longwave downward radiation (2010–2016) at the high mountain BSRN Izaña station
Rosa Delia García1,2,3, Africa Barreto4,2,3, Emilio Cuevas2, Julian Gröbner5, Omaira Elena García2, Angel Gómez-Peláez2, Pedro Miguel Romero-Campos2, Alberto Redondas2, Victoria Eugenia Cachorro3, and Ramon Ramos2 1Air Liquide España, Delegación Canarias, Candelaria, 38509, Spain
2Izaña Atmospheric Research Center (IARC), State Meteorological Agency (AEMET), Spain
3Atmospheric Optics Group, Valladolid University, Valladolid, Spain
4Cimel Electronique, Paris, France
5Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC), Davos, Switzerland
Abstract. A 7-year (2010–2016) comparison study between measured and simulated longwave downward radiation (LDR) under cloud-free conditions has been performed at the Izaña Atmospheric Observatory (IZO, Spain). This analysis encompasses a total of 2062 cases distributed almost 50 % between day and night. Results show an excellent agreement between Baseline Surface Radiation Network (BSRN) measurements and simulations with LibRadtran V2.0.1 and MODTRAN V6 radiative transfer models (RTM), similar for both models. Mean bias (simulated-measured) < 1.1 %, and root mean square error (RMSE) < 1 %, are within the instrumental error (2 %). These results highlight the good agreement between the two RTMs, demonstrating to be useful tools for LDR measurement quality control and for detecting temporal drifts in field instruments. The standard deviations of the residuals, associated to the RTM input parameters uncertainties are rather small, 0.47 % and 0.49 % for LibRadtran and MODTRAN, respectively, at day-time, and 0.49 % to 0.51 % at night-time. The observed night-time difference between models and measurements is +5 Wm-2, for precipitable water vapor (PWV) > 10 mm, indicating a scale change of the World infrared standard group of Pyrgeometers (WISG), which serves as reference for atmospheric longwave radiation measurements.

Citation: García, R. D., Barreto, A., Cuevas, E., Gröbner, J., García, O. E., Gómez-Peláez, A., Romero-Campos, P. M., Redondas, A., Cachorro, V. E., and Ramos, R.: Comparison of observed and modelled longwave downward radiation (2010–2016) at the high mountain BSRN Izaña station, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-303, in review, 2018.
Rosa Delia García et al.
Rosa Delia García et al.
Rosa Delia García et al.

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Short summary
A 7-year comparison study between measured and simulated LDR under cloud-free conditions has been performed at the BSRN Izaña. Results show an excellent agreement with a mean bias (simulated-measured) < 1.1 %, and RMSE < 1 %, are within the instrumental error (2 %).
A 7-year comparison study between measured and simulated LDR under cloud-free conditions has...
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