Estimation of the Mass Concentration of Volcanic Ash Using Ceilometers: Study of Fresh and Transported Plumes from La Palma Volcano. - Andres E. Bedoya-Velásquez; Manuela Hoyos-Restrepo; Africa Barreto; Rosa Delia García; Pedro M. Romero-Campos; Omaira Elena García; Ramón Ramos; Reijo Roininen; Carlos Toledano; Michaël Sicard; Romain Ceolato (Remote. Sens., 2022)