Motivation

One of the main objectives of SALLJEX is to accomplish a better understanding of the relationship between the low level jet (LLJ) and the Mesoscale Convective Systems (MCS’s) that develop during the austral spring and summer over Paraguay, northern Argentina and eastern Bolivia (figure 1). For this reason a large number of simple raingauges (~1000) were installed in Argentina, Paraguay and Bolivia during SALLJEX. Taking advantage of the large number of observations that were programmed for the field campaign, the network was extended to the Altiplano region with a particular interest over the Lake Titicaca area. The main objective was to describe the mesoscale convective rainfall induced by the lake, which is associated to frequent early morning convective storms (fig. 3). For this reason an additional number of simple raingauges (~190) were installed in Peru including six recording raingauges near the lake with the purpose of describing the diurnal cycle of rainfall. Part of the Bolivian network was also deployed on the Altiplano.

Fig. 1. Schematic location of the Low Level Jet and the Mesoscale Convective Systems over central South America.

Fig. 2. Hypothetical circulation and diurnal convection on the Lake Titicaca region.

Fig. 3. Hypothetical circulation and early morning convection on the Lake Titicaca region.