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Geosci. Model Dev., 11, 2139-2152, 2018
https://doi.org/10.5194/gmd-11-2139-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model evaluation paper
12 Jun 2018
Comparison of observed and modeled cloud-free 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,a, 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), Santa Cruz de Tenerife, Spain
3Atmospheric Optics Group, Valladolid University, Valladolid, Spain
4Cimel Electronique, Paris, France
5Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center (PMOD/WRC), Davos, Switzerland
anow at: Meteorological State Agency of Spain (AEMET), Delegation in Asturias, Oviedo, Spain
Abstract. A 7-year (2010–2016) comparison study between measured and simulated longwave downward radiation (LDR) under cloud-free conditions was performed at the Izaña Atmospheric Observatory (IZO, Spain). This analysis encompasses a total of 2062 cases distributed approximately evenly between day and night. Results show an excellent agreement between Baseline Surface Radiation Network (BSRN) measurements and simulations with libRadtran V2.0.1 and MODerate resolution atmospheric TRANsmission model (MODTRAN) V6 radiative transfer models (RTMs). Mean bias (simulated − measured) of  <  1.1 % and root mean square of the bias (RMS) of  <  1 % are within the instrumental error (2 %). These results highlight the good agreement between the two RTMs, proving to be useful tools for the quality control of LDR observations and for detecting temporal drifts in field instruments. The standard deviations of the residuals, associated with the RTM input parameters uncertainties are rather small, 0.47 and 0.49 % for libRadtran and MODTRAN, respectively, at daytime, and 0.49 to 0.51 % at night-time. For precipitable water vapor (PWV)  >  10 mm, the observed night-time difference between models and measurements is +5 W m−2 indicating a scale change of the World Infrared Standard Group of Pyrgeometers (WISG), which serves as reference for atmospheric longwave radiation measurements. Preliminary results suggest a possible impact of dust aerosol on infrared radiation during daytime that might not be correctly parametrized by the models, resulting in a slight underestimation of the modeled LDR, of about −3 W m−2, for relatively high aerosol optical depth (AOD  >  0.20).
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 modeled cloud-free longwave downward radiation (2010–2016) at the high mountain BSRN Izaña station, Geosci. Model Dev., 11, 2139-2152, https://doi.org/10.5194/gmd-11-2139-2018, 2018.
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Short summary
A 7-year comparison study between measured and simulated longwave downward radiation under cloud-free conditions has been performed at BSRN Izaña. Results show an excellent agreement with a mean bias (simulated–measured) less than 1.1 % and RMSE less than 1 %, which are within the instrumental error (2 %).
A 7-year comparison study between measured and simulated longwave downward radiation under...
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