A Simple New Model for Incoming Solar Radiation Dependent Only on Screen-Level Relative Humidity. Lindauer, M., Schmid, H. P., Grote, R., Steinbrecher, R., Mauder, M., & Wolpert, B. Journal of Applied Meteorology and Climatology, 56(7):1817–1825, July, 2017.
A Simple New Model for Incoming Solar Radiation Dependent Only on Screen-Level Relative Humidity [link]Paper  doi  abstract   bibtex   
Abstract Global incoming shortwave radiation (Rg) is the energy source for the majority of biogeochemical processes on Earth as well as for photovoltaic power production. Existing simple site-specific models to estimate Rg commonly use the daily range of air temperature as input variables. Here, the authors present a simple model for incoming shortwave radiation, requiring only screen-level relative humidity data (and site-specific astronomical information). The model was developed and parameterized using high-quality global radiation data covering a broad range of climate conditions. It was evaluated at independent sites, which were not involved in the process of model development and parameterization. The mean 1:1 slope was 1.02 with an average r 2 of 0.98. Normalized root-mean-square error (NRMSE) averaged at 43%. Despite its simplicity, the new model clearly outperforms conventional approaches, and it comes close to more labor- and data-intensive alternative models.
@article{lindauer_simple_2017,
	title = {A {Simple} {New} {Model} for {Incoming} {Solar} {Radiation} {Dependent} {Only} on {Screen}-{Level} {Relative} {Humidity}},
	volume = {56},
	issn = {1558-8424, 1558-8432},
	url = {https://journals.ametsoc.org/view/journals/apme/56/7/jamc-d-16-0085.1.xml},
	doi = {10.1175/JAMC-D-16-0085.1},
	abstract = {Abstract 
             
              Global incoming shortwave radiation (Rg) is the energy source for the majority of biogeochemical processes on Earth as well as for photovoltaic power production. Existing simple site-specific models to estimate Rg commonly use the daily range of air temperature as input variables. Here, the authors present a simple model for incoming shortwave radiation, requiring only screen-level relative humidity data (and site-specific astronomical information). The model was developed and parameterized using high-quality global radiation data covering a broad range of climate conditions. It was evaluated at independent sites, which were not involved in the process of model development and parameterization. The mean 1:1 slope was 1.02 with an average 
              r 
              2 
              of 0.98. Normalized root-mean-square error (NRMSE) averaged at 43\%. Despite its simplicity, the new model clearly outperforms conventional approaches, and it comes close to more labor- and data-intensive alternative models.},
	number = {7},
	urldate = {2022-11-18},
	journal = {Journal of Applied Meteorology and Climatology},
	author = {Lindauer, M. and Schmid, H. P. and Grote, R. and Steinbrecher, R. and Mauder, M. and Wolpert, B.},
	month = jul,
	year = {2017},
	pages = {1817--1825},
}

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