The jet stream - a narrow, variable band of westerly air currents miles above the Earth - is strongest in winter, when boundaries between hot tropical and cold polar air masses
are most pronounced.
In this trimester, the sequence of weather types caused less of an impact on the blooms of cyanobacteria and was mainly related to the low temperatures originating from the constant presence of the Polar air masses
. However, the front still acted as a promoter of the mixing process in addition to the meeting of the air masses of the mTA and mPA.
The team's new analyses of ground-based weather data bolster this notion by showing that some polar air masses
containing elevated concentrations of bromine monoxide (BrO) had on the previous day passed over areas of fresh sea ice, which probably sported frost flowers.
The tropical and polar air masses
that invade North America tend to travel in an easterly direction because they interact with the eastward-moving jet stream five to eight miles above the surface.
The other experts did not agree with Rebelo's prediction, and Carlos Magno stated that he believed the El Nino phenomenon this year will create a climate barrier that will prevent the polar air masses
to penetrate into the coffee belt.