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Observation and numerical simulation of the river breeze circulation in the vicinity of
the Tapajós and Amazon rivers
Maria A. F. Silva Dias (1)
Marcos Longo(1)
Pedro L. Silva Dias(1)
David R. Fitzjarrald (2)
A. Scott Denning(3)
Priscila Brier D'Auria(1)(1) Departamento de Ciências Atmosféricas, Universidade de São
Paulo
(2) Atmospheric Science Research Center, State University of New York at Albany
(3) Department of Atmospheric Sciences, Colorado State University
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29,0
29,5
30,0
30,5
31,0
31,5
32,0
08:00 11:00 14:00 17:00
Local time (hours)
Wa
ter
tem
pe
ratu
re (
de
g.C
)
0.1m
0.3 m
0.7 m
1.0 m
c
23 July 2001 Tapajós
(from Pindobal to Boim and back)
26
27
28
29
30
31
32
10:00 10:30 11:00 11:30 12:00
Local time (hours)W
ate
r te
mp
era
ture
(d
eg
.C)
0.1m
0.3 m
0.7 m
1.0 m
28 July 2001 Tapajós & Amazonas
(red line: temperature where the two rivers merge)
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Sea level pressure and 925 hPa winds from CPTEC analysis
July 29, 2001, 06 UTC
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Difference in pressure reduced to sea level between
Manaus and Santarem, from CPTEC analysis
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East-West wind component from Belterra Sounding at 950 hPa (~ 500 m)
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Pibal balloon data
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-4,0
-2,0
0,0
2,0
4,0
0 6 12 18 24
UTC (for Local time subtract 4 hrs)
U (
m/s
)
24 u
26 u
27 u
28 u
29 u
30 u
31 u
1 u
-4,0
-2,0
0,0
2,0
4,0
0 4 8 12 16 20 24
UTC
v (
m/s
)
24 v
26 v
27 v
28 v
29 v
30 v
31 v
1 v
AWS Jamaraquá
24 July / 1 August 2001
West
East
South
North
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Fitzjarrald et al, 2000
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Fitzjarrald et al, 2000
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Winds at Belterra
radiosonde
Pressure (mb)
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Winds and potential temperature
Belterra radiosonde
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RAMS numerical simulation
• 2 grids
• higher resolution 2 km
• no clouds
• different temperatures in Tapajós and Amazon rivers
• boundary conditions from CPTEC analysis
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Wind vector 23 M ABOVE THE SURFACE
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Wind vector 23 M ABOVE THE SURFACE
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Wind vector 23 M ABOVE THE SURFACE
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Wind vector 23 M ABOVE THE SURFACE
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Wind vector 23 M ABOVE THE SURFACE
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wind – streamlines perpendicular to the Tapajós river
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Potencial temperature
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RAMS numerical simulation
• 3 grids
• higher resolution 2 km
• clouds from microphysics parameterization
• different temperatures in Tapajós and Amazon rivers
• boundary conditions from CPTEC analysis
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Fitzjarrald et al, 2002
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Conclusion
River induced local circulation is important in the Amazon region. – local cloudiness - impact in surface
radiation– modulation of rainfall– local transports - impact on trace gas
budgets