During the third week of April 2008, smoke caused by grassland burning along the course of the Paraná river, started to move into its estuary.
22 October 2020
18 April 2008
The smoke plumes were driven by north-westerly winds (a rather unusual wind direction for the season).
by HansPeter Roesli (EUMETSAT)
By the second part of the week the smoke reached the estuary of the Rio de la Plata, blanketing Buenos Aires and prompting the authorities to close airports and major highways. Geomorphological details of the area of interest may be gleaned from an Aqua MODIS image (18 April, 17:50 UTC, source: NASA) and from a Meteosat-9 HRV image combined with *Google Earth (KMZ).
The evolution of the smoke plumes can be followed very well on daytime SEVIRI imagery. Both the Natural Colour RGB (16 Apr 10:00 UTC–20 Apr 21:00 UTC) and, for more detail, the HRV channel (16 Apr 16:00 UTC–20 Apr 20:45 UTC) show the day-to-day changes. It should be noted that, over South America, the time coverage of the HRV channel is curtailed due to the configuration of the SEVIRI lower HRV window. The current configuration is as follows (see also example 24-hour HRV loop , AVI):
- Between 00:00 and 14:00 UTC the lower HRV window is east justified so as to optimise the coverage of the Indian Ocean region.
- Between 14:00 and 17:00 UTC the lower HRV window moves, every hour on the hour, incrementally westwards until in becomes west justified.
- Between 17:00 and 00:00 UTC the lower HRV window is west justified to optimise the coverage of the Atlantic Ocean and South America.
Although some light smoke plumes already reach the coastal areas beforehand, the really dense smoke starts to flow into the Rio de la Plata estuary on 16 April (see HRV image , 19:30 UTC). On 17 April, the winds turn more westerly and drive the smoke way out into the Atlantic (see HRV image , 19:30 UTC). A secondary plume moves towards the Montevideo area.
On 18 April, still driven by westerly winds, the smoke appears to reach its largest extension with much smoke also over the sea (see HRV image , 19:30 UTC). An enhanced image of MODIS channel 1 (18 Apr, 17:50 UTC) reveals wave structures of unknown origin. They appear to be partially covered by the smoke and to be running roughly parallel to the coast.
On 19 April, cloud cover makes the detection of smoke difficult, but the wind direction is unchanged with respect to the two days before (see HRV image , 19:30 UTC).
Finally, on 20 April, the wind changes veering to a more northerly direction (see HRV image , 19:30 UTC) and starts to blow the smoke away from the mouth of the Rio de la Plata. The winds continue to blow from due north the next day (see HRV image , 19:30 UTC) freeing Buenos Aires and Montevideo of this unhealthy situation. However, fires continue to burn along the Rio Paraná as indicated by many individual smoke plumes on the HRV image and the hot spot area indicated in a Night Cloud Microphysics RGB (see 04:00 UTC image ).
Meteosat-9 Natural Colours RGB Composite
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