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Argos DCS System Use Agreement of the Month
– October 2015

University of São Paulo
Impact of Southwestern Atlantic Ocean on South American Climate


The main objective of this research project is to understand the South American climate variability in the present day with atmospheric and oceanographic observational data analysis and analyze future climate scenarios using data from Global Circulation Models and dynamical downscaling simulations through Regional Climate Models (RCMs).

This proposal is relevant because it will contribute to a better understanding of the climate variability over South America especially that linked to the Southwestern Atlantic Ocean (SAO). Particular emphasis will be placed on understanding natural versus anthropogenic-induced variations of the SAO, which is of utmost importance to provide accurate projections of climate change.

Both the modeling and observational components of the project are of equal relevance to understanding the problem of climate variability over South America. To understand the contribution of anthropogenic-induced relative to natural variability in the SAO and to use models to provide a 4-dimensional depiction of the oceanic circulation, and to understand the interactions between the atmosphere and ocean, and the resultant influence on the South American climate.

However, one of the impediments to improving models' performance is a lack of observations with which to judge their veracity. An accurate picture of the present day oceanic circulation would be an immensely valuable asset. Therefore, this project also contains an observational component, part of which will be the deployment of an array of buoys in the SAO to monitor the ocean-atmosphere interface. In parallel, surface properties will be monitored via satellite and compared to in-situ observations, and historical data will be analyzed.

Specific Goals:
- To understand whether the intensity of precipitation, persistence and circulation of SACZ and South America Monsoon will change due to global warming.
- Assessment of possible alterations driven by distinct climate change scenarios in the precipitation regime associated with frontal systems and atmospheric blocking over southeastern Brazil.
- Analyze the impact of SST anomalies in the climatology and variability of the cyclones that developed in the SAO and how it will change in future global warming scenarios.
- To explore the possible role of multi-scale resonances in generating low-frequency fluctuations in the atmosphere-ocean system.
- Study how the regional to local ocean behavior change in a changing climate
- The deployment of an observational array Buoy in the South Brazil Bight (SBB) and an associated in situ observational program. The observational component will have: Current and Hydrographic Measurements; Biological / Bio-Optical Component; Bottom Sediments/Benthos; Coastal Zone (Surface waves and Tides) and Numerical Modeling.

This specific application with the use of Argos data transmission is for the wave rider buoy (Datawell) to be deployed off the coast of São Paulo, Brazil.

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