STATUS OF SALLJEX RELATED INVESTIGATIONS
THEME I: SALLJ MAIN FEATURES
I.a) Quantification of the structure and variability of the
SALLJ over different spatial scales.
Structure of the LLJ and its synoptic variability as described by both SALLJEX
data and estimates from operational analyses. M. Douglas, J. M. Galvez, J.
F. Mejia, M. Nicolini, E. Zipser, C. Saulo and P. Salio
Case studies using SALLJEX data and mesoscale modeling tools. SALLJ driving
mechanisms. Role of SALLJ on transport processes. G. Ulke, M.Nicolini, Y.
Garcia Skabar, P. Silva Dias, M. Douglas and J. F. Mejia.
Studies on LLJ events during the LBA DRY to WET and SALLJEX Brasil. J. Marengo
Observational and numerical case studies for different interests. M. Nicolini,
P. Salio, Y. Garcia Skabar , G. Ulke, C. Saulo, L. Ferreira, J. Ruiz
I.b) Description of the spatial variability of the diurnal cycle of
the lower and middle tropospheric wind field
Study of diurnal wind cycles during SALLJEX. Revision of Bonner criterion
the SALLJEX region. M. Nicolini, J. Paegle, P. Salio.
I.c) Description of the Chaco heat low, its variability in space and
time, the basic processes responsible for its maintenance and its relationship
with SALLJ events.
Analysis of the Chaco heat low event between 30 Jan and 2 Feb. L. Ferreira,
C. Saulo, M. Seluchi, and J. Mejia.
THEME II: SALLJ AND RAINFALL EVENTS
II.a) Determination of wet and dry periods during the experiment
and their relationship with SALLJ events.
LLJs and extreme precipitation events. H. Berbery, E. Collini, V. Silva.
Relationship between the occurrence of SALLJ and daily precipitation and
temperature extreme events. O. Penalba, M. Rusticucci, L. de Benedictis.
Extreme precipitation events over Southern Brazil associated to SALLJ. T.
Ambrizzi and collaborators.
Intraseasonal oscillation influence on SALLJ and related rainfall pattern.
C.Vera, C. Saulo, B. Liebmann, C. Campetella, G. Kiladis, J. N. Paegle.
II.b) The relationship between mesoscale convective complexes over
northern Argentina or western Paraguay and the LLJ
Diurnal cycle of MCSs over northeast Argentina and possible relationship
diurnal cycle of the SALLJ. Salio, Zipser and Nicolini
The relationship between extreme South American Low-Level Jet events with
the formation and maintenance of mesoscale convective systems. Zipser, Salio
Case study of the large and intense MCS of 22-23 January, including time
history of satellite IR high resolution data, surface meteorological and
rainfall data, and aircraft in situ and Doppler radar data. Zipser, Salio,
Nicolini, M. Douglas, B. Liebmann, C. Liu.
Feedback between convection and low level jet strength. J. Ruiz and C. Saulo.
II.c) The structure of cold frontal surges near the eastern slopes
of the Andes
II.d) The description of mesoscale wind and moisture variability over
Relationship between the the low-level circulation over the Bolivian low-lands
and the Altiplano rainfall. R. Garreaud, P. Aceituno.
Mesoscale rainfall variability over the Altiplano and the Titicaca Lake.
M. Douglas, J. M. Galvez, J. F. Mejia, R. Orozco, C. Reyes.
II.e) Determination of the accuracy of satellite-rainfall estimates
over the region.
Statistical study of the convective intensity of MCSs over the SALLJEX area,
combining "snapshots" from the Tropical Rain Measuring Mission with the more
comprehensive IR database. Zipser, Salio, Nicolini, C. Liu.
THEME III: NUMERICAL MODELING
III.a) SALLJEX Modeling experiment
Summary of the experiment results. C. Saulo
III.b) Validation of numerical simulation sensitivity studies that
attempt to reproduce the structure of the jet and its variability
Studies of forecast sensitivity to initial state changes using SALLJEX observations.
J. Paegle, C. Saulo, L. Byerle, and J. N. Paegle.
Validation of forecast models using SALLJEX observations. J. Paegle, C. Saulo,
Validation of two different versions of the ETA/CPTEC Model performance during
SALLJEX. M. Seluchi, G. Meira, Chou, J. Gomes, J. Bustamante.
Model evaluation: role of initial and boundary conditions. H. Berbery, E.
Collini, V. Silva.
Analysis of different case studies considering the period of the experiment
and different model results. I. Cavalcanti, P. Silva Dias, M. A. Silva Dias,
C. Saulo, M. Nicolini, J. Marengo.
Analysis of the LLJ structure through regional climate simulations with high
space-temporal resolution. T. Ambrizzi and collaborators.
III.c) SALLJEX rainfall data comparison with numerical simulations.
Use of rainfall estimates from NOAA-P3 radar data for validation of rainfall
numerical simulations. G. Raga and collaborators (planned, not started)
Local forecast of convection over northern Argentina using SALLJEX upper
air data. M. Nicolini and C. Saulo.
III.d) Assimilation experiments of the SALLJEX data with global and
Modeling experiments, using the PSAS assimilation scheme in the AGCM CPTEC/COLA,
and RPSAS in the regional model. I. Cavalcanti, J. Marengo, D. Herdies.
SALLJEX data assimilation experiments using Global and regional CPTEC Models.
D. Herdies, R. Cintra, J. Aravequia.
Evaluation of the impact of enhanced NCEP analysis with SALLJEX data (through
downscaling) regional short range forecast using RAMS. M. Nicolini, P. Silva
Dias, M. A. Silva Dias, Y. Garcia Skabar.
Assimilation experiments with and without SALLJEX data, combined with simple
breeding experiments in order to evaluate bred vectors shape. E. Kalnay and
collaborators (suggested investigation).
III.e) Model improvement in the region
Impact of the Finite Volume Numerical Scheme in RAMS Simulations of the Andes
LLJ. P. Silva Dias, D. Soares Moreira, S. Barros, E. Freitas.
Improvements in the RAMS data assimilation system. . P. Silva Dias, A. Gandu,
D. Soares Moreira, S. Freitas.
Combined use of MM5 and ARPS models for an improvement of the convection
forcing in the SALLJ region. G. Raga, D. Pozo, M. Torres Brizuela, M. Nicolini
Modeling experiments using different convection and radiation parametrization
schemes, during the period of the experiment. I. Cavalcanti, S. Nilo, J.
THEME IV: ADDITIONAL SALLJ RELATED TOPICS
Impacts of deforestation of the Amazon basin on the Amazon region
on the LLJ. J. Marengo and collaborators.
Variability of the convective cloudiness regime over eastern South America
during the austral summer semester with emphasis on SACZ and the southeastern
sector of the continent. A. Diaz, P. Aceituno
Relationship between the rainfall regime in Uruguay during the summer semester
and preceding precipitation in central South America. A. Diaz, R. Terra,
G. Pisciottano, G. Cazes and M. Medina.
Using ECMWF and NASA scatterometer ocean surface to study the process that
control seasonal, interannual and intraseasonal variations of SALLJs. R.
Fu, H. Wang, T. Liu and W. Tan.
Study of the ability of the regional climate model in reproduce observational
features of the moisture transport associated to the LLJ occurrence periods.
T. Ambrizzi and collaborators.
LLJs and the hydrologic cycle. H. Berbery, E. Collini, V. Silva.
Mechanistic experiments to test the role of changes in the SALLJ transport
in the initiation of droughts. E. Kalnay and collaborators (suggested topic)
Basic water and momentum balances for the SALLJ region with and without SALLJEX
data E. Kalnay and collaborators (suggested topic).
CROSS-THEME: STATUS OF SALLJEX DATABASE:
-SALLJEX data base: José Meitín
-SALLJEX upper-air data processing at NSSL, CPTEC, UBA (is it necessary to
have a presentation on this?)
-SALLJEX rainfall data processing: Compilation of activities currently being
performed at UBA, CPTEC, DINAC, and NSSL.