Dry and Wet Climate Periods over Eastern South America: identification and Characterization through the SPEI Index - Drumond, Anita; Stojanovic, Milica; Nieto, Raquel; Gimeno, Luis; Liberato, Margarida L. R; Pauliquevis, Theotonio; Oliveira, Marina; Ambrizzi, Tercio (Atmosphere, 2021)