RT Journal Article
T1 Dry and wet climate periods over Eastern South America: identification and characterization through the SPEI index
A1 Drumond, Anita
A1 Stojanovic, Milica
A1 Nieto Muñiz, Raquel Olalla
A1 Gimeno Presa, Luis
A1 Liberato, Margarida L. R.
A1 Pauliquevis, Theotonio
A1 Oliveira, Marina
A1 Ambrizzi, Tercio
K1 2502 Climatología
K1 2501.06 Dinámica Atmosférica
K1 2508.10 Precipitación
AB A large part of the population and the economic activities of South America are located in eastern regions of the continent, where extreme climate events are a recurrent phenomenon. This study identifies and characterizes the dry and wet climate periods at domain-scale occurring over the eastern South America (ESA) during 1980–2018 through the multi-scalar Standardized Precipitation–Evapotranspiration Index (SPEI). For this study, the spatial extent of ESA was defined according to a Lagrangian approach for moisture analysis. It consists of the major continental sink of the moisture transported from the South Atlantic Ocean throughout the year, comprising the Amazonia, central Brazil, and the southeastern continental areas. The SPEI for 1, 3, 6, and 12 months of accumulation was calculated using monthly precipitation and potential evapotranspiration time series averaged on ESA. The analysis of the climate periods followed two different approaches: classification of the monthly SPEI values as mild, moderate, severe, and extreme; the computation of the events and their respective parameters (duration, severity, intensity, and peak). The results indicate that wet periods prevailed in the 1990s and 2000s, while dry conditions predominated in the 2010s, when the longest and more severe dry events have been identified at the four scales.
PB Atmosphere
SN 20734433
YR 2021
FD 2021-01-26
LK http://hdl.handle.net/11093/2169
UL http://hdl.handle.net/11093/2169
LA eng
NO Atmosphere, 12(2): 155 (2021)
NO Fundação de Amparo à Pesquisa do Estado de São Paulo | Ref. 2020/09548-2
DS Investigo
RD 13-dic-2024