Physics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ipesprept.....g&link_type=abstract
M.S. Thesis Instituto de Pesquisas Espaciais, Sao Jose dos Campos (Brazil).
Physics
Advection, Cyclones, Low Pressure, Troposphere, Atmospheric Circulation, Atmospheric Pressure, Brazil, Tropical Regions
Scientific paper
Upper tropospheric cold lows in the subtropics are studied. From satellite imagery it is observed that the moist lows (those having significant cloudiness) form in the period of May to September. The formation of these cyclones is preceded by the intensification of a ridge to the southwest. The cold lows are observed to move eastward when they are embedded in the mid latitude flow. When they are cut off from this flow, the advection of planetary vorticity dominates and, therefore, the cold lows drift to the west. A possible explanation for their maintenance is the infusion of cold air from upper air troughs at higher latitudes.
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