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The effect of screen level and upper air temperatures and atmospheric moisture on the downward atmospheric radiation in the South Australian region

  • A. H. MaghrabiEmail author
  • S. H. Aodahh
Original Paper
  • 27 Downloads

Abstract

Determination of the long wave (LW) atmospheric radiation (λ = 4–100 μm) is of great importance for several applications. In this study, the effect of screen level and upper air temperatures and water vapour contents on the LW radiation for clear skies has been investigated using 4 years of measurements conducted in Adelaide (34.9° S;130.6° E), South Australia. A two-variable model, which depends on the screen level temperature and vapour pressure, has been developed to calculate the LW radiation. The model can predict the hourly measured data with a correlation coefficient of 0.88, giving mean bias error (MBE) of 0.21 W/m2, root mean square error (RMSE) of 17.3 W/m2, and a mean percentage error (MPE) of − 0.11% with respect to hourly observations. The performance of the multilinear model was tested against a 1-year independent data set. In this case, the MBE, RMSE, MPE, and correlation coefficient were 0.94 W/m2, − 2.2 W/m2, 18.1 W/m2, − 0.5%, and 0.85, respectively. Using radiosonde data, the total atmospheric water content has been calculated and its effect on the LW radiation has been investigated. A simple model that uses the screen level temperature and the precipitable water vapour (PWV) has been proposed. The correlation coefficient, MBE, and RMSE for this model were 0.93, 0.08 W/m2, and 12.12 W/m2, respectively; an MPE of 0.09% was reported by the model. The predictions of ten well-known clear sky models have been evaluated against the measured LW radiation data. These models were, then, adjusted and their performances have been assessed. The impact of the atmospheric mean weighted temperature on the LW radiation was studied. We have found that this temperature has less of an effect on the LW atmospheric radiation than screen level temperature. Finally, the clear sky model which uses the screen level parameters has been adjusted to account for the effect of clouds on the LW radiation. The model shows an acceptable predictability for the LW radiation under all sky conditions. The MBE, RMSE, MPE, and correlation coefficient for this model were 0.51 W/m2, 22.5 W/m2, 0.2% and 0.80, respectively.

Keywords

Downward radiation Precipitable water vapour Weighted temperature Meteorology Screen level temperature 

Notes

Acknowledgements

We would like to thank King Abdulaziz City for Science and Technology (KACST) for supporting this work. We would also like to thank the anonymous reviewers for their valuable comments and recommendations.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.National Center for Applied PhysicsKing Abdulaziz City for Science and TechnologyRiyadhSaudi Arabia
  2. 2.Physics and Astronomy DepartmentKing Saud UniversityRiyadhSaudi Arabia

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