Ralf Schiebel4 articles listing Ralf Schiebel in PNAS, Nature Communications, Science, indexed by Paperzzz from Crossref and OSF.Reduced N2 fixation in the tropical Atlantic Ocean during the warm late Pliocene Nature CommunicationsProkaryotic bias in surface ocean particles PNASCalcifying plankton: From biomineralization to global change ScienceUnprecedented suppression of Panama’s Pacific upwelling in 2025 PNAS