Alfonso Delgado-Bonal, Associate Scientist, Earth Sciences

Alfonso Delgado-Bonal

Contact Info

NASA Goddard Space Flight Center
Bldg 33, Room A317
Greenbelt, MD 20771
Phone: 301-614-6293

Research Interests

Dr. Delgado-Bonal develops research in the field of radiation entropy and thermodynamics. This field has its roots in the very foundations of quantum mechanics, but it is not very common nowadays. However, by making use of this point of view, Dr. Delgado-Bonal's research offers a different perspective on the interaction between the radiation field and the environment. Entropy is a physical magnitude associated with radiation, but it is also a mathematical quantity coming from the field of information theory. Both approaches provide unique insights into the relationship between the radiation field and the environment and how that interaction evolves in time determined by our atmosphere's physicochemical processes.


Dr. Delgado-Bonal joined GESTAR in 2020 after being awarded a NASA Postdoctoral Fellow at NASA Goddard in 2018 for his proposal on "entropy and climate change." In his current role, he supports the DSCOVR satellite mission to analyze climatic variability, such as the daily changes in cloud coverage. Before coming to Goddard, Dr. Delgado-Bonal worked at the Spanish Research Council with a Fellowship awarded by Iberdrola Foundation in their energy and environment program. He has completed a Bachelor in Theoretical Physics, an M.Sc. in Astronomy and Astrophysics and another M.Sc. in Space Science and Technology, and a Ph.D. in Physics. He carried out his thesis work on nonequilibirum thermodynamics at the Spanish astrobiology institute and has continued with multidisciplinary research ever since. Dr. Delgado-Bonal enjoys the transference of ideas between different fields and has completed a Bachelor in Economics and a LL.B. (Bachelor of Laws).


· A. Delgado-Bonal, A. Marshak, Y. Yang, and L. Oreopoulos, Daytime variability of cloud fraction from DSCOVR/EPIC observations, Journal of Geophysical Research: Atmospheres, 125, e2019JD031488, (2020)

· A. Delgado-Bonal, On the use of complexity algorithms: a cautionary lesson from climate research, Scientific Reports, 10, 5092, (2020)

· A. Delgado-Bonal, A. Marshak, Y. Yang and D. Holdaway, Analyzing changes in the complexity of climate in the last four decades using MERRA-2 radiation data, Scientific Reports, 10, 922, (2020) doi:10.1038/s41598-020-57917-8

· A. Delgado-Bonal, Quantifying the randomness of the stock markets, Scientific Reports, 9, 12761, (2019) doi:10.1038/s41598-019-49320-9

· A. Delgado-Bonal and A. Marshak, Approximate Entropy and Sample Entropy: A Comprehensive Tutorial, Entropy, 21(6), 541, (2019) doi:10.3390/e21060541

· A. Delgado-Bonal, Entropy of radiation: the unseen side of light, Scientific Reports, 7, 1642, (2017) doi:10.1038/s41598-017-01622-6

· A. Delgado-Bonal and F.J. Martín-Torres, Human vision is determined based on information theory, Scientific Reports, 6, 36038, (2016) doi:10.1038/srep36038

· A. Delgado-Bonal, M.-P. Zorzano and F.J. Martín-Torres, Martian Top of the Atmosphere 10-to 420 nm spectral irradiance database and forecast for solar cycle 24, Solar Energy, Vol. 134, pp. 228-325, (2016) doi:10.1016/j.solener.2016.05.004

· A. Delgado-Bonal, F.J. Martín-Torres, S. Vázquez-Martín, M.-P. Zorzano, Solar and wind exergy potentials for Mars, Energy, Vol. 102, pp. 550-558, (2016) doi:10.1016/

· A. Delgado-Bonal and F.J. Martín-Torres, Solar Cell Temperature on Mars, Solar Energy, Vol. 118, pp. 74-79, (2015) doi:10.1016/j.solener.2015.04.035

· A. Delgado-Bonal and F.J. Martín-Torres, Evaluation of the Mars atmospheric chemical entropy production, Entropy, Vol. 17, pp. 5047-5062, (2015) doi:10.3390/e17075047

· A. Delgado-Bonal and F.J. Martín-Torres, A Mathematic Approach to Nitrogen Fixation Through Earth History, in: The Early Evolution of the Atmospheres of Terrestrial Planets, Springer, Vol. 35, pp. 23-31, (2013) doi:10.1007/978-1-4614-5191-4_3