The Scientist A. Tovar has been granted by the Fulbright Commission (https://fulbright.es) in the program of mobility of «Stays for senior professors and researchers at foreign centers». The researcher will spend 6 months at the Lamnont-Doherty Earth Observatory at Columbia University in New York (USA) (https://www.ldeo.columbia.edu). The objective of this stay is to study the priocess involved in the biogeochemical cycles of trace elements in the ocean, addressing research lines that range from the study of ocean surface microlayer to the use of drone technology for ocean sampling and exploration .