@InProceedings{CohenSáNoguGand:2006:HiReSi,
               author = "Cohen, Julia Clarinda Paiva and S{\'a}, Leonardo Deane de Abreu 
                         and Nogueira, Daniele Santos and Gandu, Adilson Wagner",
          affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "High resolution simulation of low level jets in the eastern 
                         Amazonia",
            booktitle = "Proceedings...",
                 year = "2006",
               editor = "Vera, Carolina and Nobre, Carlos",
                pages = "1733--1740",
         organization = "International Conference on Southern Hemisphere Meteorology and 
                         Oceanography, 8. (ICSHMO).",
            publisher = "American Meteorological Society (AMS)",
              address = "45 Beacon Hill Road, Boston, MA, USA",
             keywords = "Low level Jets, BRAMS.",
             abstract = "An important research domain is referred to the forest-atmosphere 
                         interaction, since the flow in the region immediately above the 
                         vegetation is complex and has characteristics still not well 
                         known. One of these characteristics is the existence, in some 
                         situations, of relative maxima in the wind velocity vertical 
                         profiles, the low level jets (LLJ), in regions less than 1 km 
                         distant from the surface. They may contribute to intensify the 
                         mixture in the surface and in the region where they occur. It is 
                         possible that the presence of such phenomenon introduce additional 
                         difficulties in the parameterization of the forest-atmosphere 
                         exchange processes. Therefore, it is entirely reasonable the study 
                         of LLJs in order to determine the conditions of their occurrence 
                         and to investigate the consequences of their existence in the 
                         characteristics of the Nocturnal Boundary Layer (NBL) structure 
                         near the surface. The data were collected during the Field 
                         Experiment called CiMeLA (Mesoscale Circulations in the Eastern 
                         Amazonia), from October 27 to November 17 of 2003, in the Forest 
                         Reserve of Caxiuan{\~a}, Par{\'a}. During this Experiment, the 
                         measurements were vertical soundings of the atmosphere with 
                         radiosondes, launched at four different times per day (06, 12, 18, 
                         00 UTC), except in the last three days of the Experiment, when 
                         there were soundings in every 3 hours (keeping the times above). 
                         BRAMS (Brazilian developments on the Regional Atmospheric Modeling 
                         System) was used to evaluate the origin of the LLJ. The numerical 
                         simulations presented contained 3 nested grids with a horizontal 
                         spacing of 45, 15 and 5 km. The models initialization was 
                         variable, each 6 hours, with the analysis of CPTECs global model, 
                         the radiosondes and surface data. The simulation used the models 
                         of surface and vegetation, radiation, cloud microphysics, deep 
                         convective parameterization of Grell and shallow convection 
                         parameterization. The numerical simulations with this high 
                         resolution model indicated the occurrence of low level jets, 
                         nevertheless it did not reproduce in detail some of the observed 
                         characteristics of the flow. It generated both LLJs of November 13 
                         and 14 at 06 UTC. However, their magnitude was about 2 and 3 m/s 
                         lower and their height was higher than what was observed. Another 
                         interesting result was that the equivalent potential temperature 
                         indicated the arrival of thermodynamically different air possibly 
                         associated to the LLJ. An important aspect revealed by the 
                         simulations with BRAMS was the origin of the jets, which is 
                         associated to a phenomenon of canalization of the flow above zones 
                         where there are some of the great rivers in the Northeast of 
                         Par{\'a}.",
  conference-location = "Foz do Igua{\c{c}}u",
      conference-year = "24-28 Apr. 2006",
           copyholder = "SID/SCD",
             language = "en",
         organisation = "American Meteorological Society (AMS)",
                  ibi = "cptec.inpe.br/adm_conf/2005/10.29.12.19",
                  url = "http://urlib.net/ibi/cptec.inpe.br/adm_conf/2005/10.29.12.19",
           targetfile = "1733-1740.pdf",
                 type = "Weather analysis and forecasting",
        urlaccessdate = "20 maio 2024"
}