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Sex, 02 de Agosto de 2013 17:52

1. An MSG Case Study with Image Fusion over Brazil


Humberto Barbosa, Diego Rocha and Ivon Wilson



At the Laboratory for Analyzing and Processing Satellite Images (LAPIS), techniques to retrieve parameters related with atmosphere and land applications are developed by using MSG data. During the second training of the South American network operators group of EUMETCast-GEONETCast participants were introduced to a case of severe convection took place on 4 June 2010 over Brazil showing the use of the image fusion. Effectiveness of this technique was to merge spatial distortion from images with different spatial and spectral characteristics through data fusion of RGB (R: IR 0.16µm; G: 0.08µm; B: 0.06µm) bands with HRV band. This example of application was developed under ILWIS 3.6 and ENVI technique Gram-Schmidt Spectral Sharpening.



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2. Meteosat-10 imagery can be used to investigate the connection between a low-level jet and heavy precipitation over southern Brazil


Humberto Barbosa and Carlos Pinto Neto.


In the colour-enhanced Meteosat-10 IR 10.8µm image on 10 October (Figure 1) there is a widespread area with very cold cloud tops (191 K). In this example, a couple of severe subtropical Mesoscale Convective Systems (MCSs) are observed over southern Brazil.

The lower level jet is channelled by the Andes, with moisture extending across northern Chile-Paraguay to southern Brazil. This flow is associated with a subtropical jet (upper level jet) from the south, which enhances the low level convergence and helps with the development of convection.



Figure 1: Met-10, 10 October 2015, 10:00 UTC, IR 10.8µm 
Full Resolution


A maximum wind speed of about 25–30 ms-1 (90–110 km/h) at 1016 hPa is centered near 30°S-55°W. It is a consequence of the subtropical MCS activity (Figure 2).


Figure 2: Met-10, 10 October 2015, 10:00 UTC,  IR 10.8µm image and NWP (pressure and wind) fields
Full Resolution


The thermodynamic and wind fields structure of the Chaco Jet enhanced the convective instability by transporting heat and moisture over southern Brazil. Heavy precipitation is triggered at the exit region of the low level jet.

The subtropical jet, as one of the primary sources of upper divergence, is found between 250–200 hPa.


Figure 3

Figure 3: NWP vertical cross section along transect depicted in Figure 1. 
Full Resolution


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3. Using Meteosat-10 imagery to identify cloud patterns associated with an anticyclone in Brazil.


Humberto Barbosa, Salomão Medeiros and Carlos Pinto Neto.


The Meteosat-10 HRV image on 07 January (Figure 1) shows a high pressure centre (Bolivia High) at high levels (250 hPA) which is predominant in South America's atmospheric circulation during the summer.

In this example, it is observed that from the synoptic point of view the instability in the region is dynamically supported by upper level divergence in the transition zone of the Bolivia High (BH) and the cyclonic circulation in the vicinity of Northeastern Brazil (CVNE) in the upper troposphere.


Figure 1: Met-10, 07 January, 17:45 UTC HRV image and NWP (wind at 250 hPa) fields.
Full Resolution


Cloud patterns are associated with the Bolivian High (BH) in Brazil, which have an intrinsic relationship with deep convection. The structure of the Bolivian anticyclone-Nordeste low system is a short-wave train across South America modulated by the long-wave regime. The short-wave train exhibits a monsoon vertical phase reversal in the mid-troposphere and a quarter-wave phase shift relative to the divergent circulation. The Bolivian anticyclone (BH) could help the organization of deep convection in its southern flank by the interaction with short waves and intensified subtropical jet (strong BH). It distinguished Ci clouds (Figure 1) and enhanced convection (Figure 2) over Brazil.


Figure 2: Met-10, 08 January, 11:30 UTC WV6.2 image and NWP (wind at 250 hPa) fields.
Full Resolution


The BH is well-defined and is situated over south-western Amazonia near Bolivia, and the CVNEs are found over the south-western Atlantic Ocean (Figure 2).

The rainfall at this time of the year seems to be associated with the presence of upper level divergence in the transition region between the opposite circulation systems: the BH and the CVNE.

BH divergence could help the organisation of deep convection in its southern flank by its interaction with short waves as well as by its intensified subtropical jet.


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