scholarly journals Relationship between daily atmospheric circulation patterns and South Atlantic Convergence Zone (SACZ) events

2020 ◽  
Author(s):  
Gustavo Carlos Juan Escobar ◽  
Michelle Simões Reboita
Keyword(s):  
Atmospheric Circulation ◽  
South Atlantic Convergence Zone ◽  
South Atlantic ◽  
Convergence Zone ◽  
Atmospheric Circulation Patterns ◽  
Circulation Patterns

scholarly journals Isotopic Composition of Precipitation in a Southeastern Region of Brazil during the Action of the South Atlantic Convergence Zone

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 418
Author(s):  
Cleber Santos ◽  
Rayonil Carneiro ◽  
Camilla Borges ◽  
Didier Gastmans ◽  
Laura Borma
Keyword(s):  
Isotopic Composition ◽  
Hydrological Cycle ◽  
Statistical Tests ◽  
Spatial Scales ◽  
South Atlantic Convergence Zone ◽  
South Atlantic ◽  
Southeastern Brazil ◽  
Convergence Zone ◽  
The South ◽  
Hysplit Model

The use of stable isotopes of hydrogen and oxygen is a tool widely used to trace water paths along the hydrological cycle, providing support for understanding climatic conditions in different spatial scales. One of the main synoptic scale events acting in southeastern Brazil is the South Atlantic Convergence Zone (SACZ), which causes a large amount of precipitation from southern Amazonia to southeastern Brazil during the southern summer. In order to determine the isotopic composition of precipitation during the action of SACZ in São Francisco Xavier in southeastern Brazil, information from the Weather Forecasting and Climate Studies Center of the National Institute for Space Research (CPTEC) was used regarding SACZ performance days, the retrograde trajectories of the HYSPLIT model, and images from the GOES-16 satellite, in addition to the non-parametric statistical tests by Spearman and Kruskal–Wallis. A high frequency of air mass trajectories from the Amazon to southeastern Brazil was observed when the SACZ was operating. During the SACZ events, the average isotopic composition of precipitation was more depleted, with a δ18O of −9.9‰ (±2.1‰), a δ2H of −69.3‰ (±17.9‰), and d-excess of 10.1‰ (±4.0‰). When disregarding the SACZ performance, the annual isotopic composition can present an enrichment of 1.0‰ for δ18O and 8.8‰ for the δ2H. The long-term monitoring of trends in the isotopic composition of precipitation during the SACZ events can assist in indicating the evapotranspiration contribution of the Amazon rainforest to the water supply of southeastern Brazil.

scholarly journals Dynamics-based regression models for the South Atlantic Convergence Zone

2018 ◽  
Vol 52 (9-10) ◽  
pp. 5527-5553
Author(s):  
David Marcolino Nielsen ◽  
André Luiz Belém ◽  
Edilson Marton ◽  
Marcio Cataldi
Keyword(s):  
Regression Models ◽  
South Atlantic Convergence Zone ◽  
South Atlantic ◽  
Convergence Zone ◽  
The South
Sign in / Sign up

Export Citation Format

Share Document